Form 8-K - Current report

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (date of earliest event reported): October 24, 2024

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FIRST INTERSTATE BANCSYSTEM, INC.

(Exact name of registrant as specified in its charter)

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Delaware

001-34653

81-0331430

(State or other jurisdiction of
incorporation or organization)

(Commission
File No.)

(IRS Employer
Identification No.)

401 North 31st Street

Billings,

59101

(Address of principal executive offices)

(zip code)


	(406)	255-5311
(Registrant’s telephone number, including area code)

	Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a- 12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

* * * * *

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of exchange on which registered
Common stock, $0.00001 par value	FIBK	NASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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Item 2.02 Results of Operations and Financial Condition.

On October 24, 2024, First Interstate BancSystem, Inc. (the “Company”) issued a press release regarding its financial results for the quarter ended September 30, 2024. A copy of the press release is furnished herewith as Exhibit 99.1 and is incorporated by reference herein. Neither the information included or incorporated by reference under this Item 2.02, nor the press release furnished herewith, shall be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or incorporated by reference into any registration statement or other document filed pursuant to the Securities Act of 1933 (the “Securities Act”) or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 7.01 Regulation FD Disclosure.

On October 24, 2024, the Company posted a new corporate presentation (the “Presentation”) on the Events & Presentations page of the Company’s website at https://www.fibk.com. The Presentation, which is furnished with this Current Report as Exhibit 99.2 and incorporated herein by reference, updates previously furnished presentations and provides an overview of the Company and its operations. Neither the information included or incorporated by reference under this Item 7.01, nor the Presentation furnished herewith, shall be deemed to be “filed” for purposes of Section 18 of the Exchange Act or incorporated by reference into any filing under the Securities Act or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 8.01 Other Events.

On October 24, 2024, the Company also announced that the Board of Directors of the Company declared, on October 23, 2024, a dividend of $0.47 per share, that is payable November 14, 2024 to shareholders of record of the Company as of November 4, 2024.

Item 9.01 Financial Statements and Exhibits.


(d)	Exhibit Number	Description

	99.1	Press Release dated October 24, 2024.

	99.2	Presentation

	104	Cover Page Interactive Data File (embedded within Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: October 24, 2024



			FIRST INTERSTATE BANCSYSTEM, INC.

			By:			/s/ KEVIN P. RILEY
						Kevin P. Riley
						President and Chief Executive Officer

Exhibit 99.1

For Immediate Release

First Interstate BancSystem, Inc. Reports Third Quarter Earnings

Billings, MT - October 24, 2024 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the third quarter of 2024. For the quarter, the Company reported net income of $55.5 million, or $0.54 per share, which compares to net income of $60.0 million, or $0.58 per share, for the second quarter of 2024 and net income of $72.7 million, or $0.70 per share, for the third quarter of 2023.

HIGHLIGHTS

•Appointed James A. Reuter as the Company’s President and Chief Executive Officer, effective end of day November 1, 2024.

•Net interest margin increased to 3.01% for the third quarter of 2024, a 4-basis point increase from the second quarter of 2024. Net interest margin, on a fully taxable equivalent (“FTE”) basis1, increased to 3.04% for the third quarter of 2024, or a 4-basis point increase from the second quarter of 2024.

•Criticized loans decreased $14.7 million at September 30, 2024, compared to $618.0 million at June 30, 2024, driven mostly by charge-offs. Net Charge-offs of $27.4 million or 0.60 basis points of average loans included a commercial real estate loan and a construction real estate loan in the metro office portfolio totaling $22.1 million. Net charge-offs within the remaining portfolio totaled $5.3 million or 0.12% of average loans.

•Total deposits decreased by $6.6 million at September 30, 2024 from June 30, 2024, driven by a large temporary deposit included on the balance sheet at June 30, 2024 that was withdrawn early in the third quarter; excluding the large temporary deposit, deposits increased approximately 1% at September 30, 2024 from June 30, 2024.

•Non-interest expense increased $2.5 million for the third quarter of 2024, compared to the second quarter of 2024 and decreased $1.7 million compared to the third quarter of 2023. Non-interest expense included $3.8 million related to the transition of the Company’s President and Chief Executive Officer; excluding CEO transition expenses, non-interest expense decreased $1.3 million for the third quarter of 2024, compared to the second quarter of 2024 and decreased $5.5 million compared to the third quarter of 2023.

•Capital ratios continued to improve during the third quarter of 2024, with common equity tier 1 capital ratio increasing 0.30% to 11.83%, compared to the second quarter of 2024.

“We were pleased to see continued improvement in our core operating metrics in the quarter. Net Interest Margin and Net Interest Income improved for the second consecutive quarter, and Net Interest Margin exceeded 3%, excluding purchase accounting, in the month of September. The Company continued to exert expense discipline, and fee businesses performed generally in-line with expectations. While there was charge-off activity this quarter within the metro-office portfolio, we believe notable losses in that portfolio are now behind us. Looking into 2025, the Company is well positioned to experience continued profitability expansion,” said Kevin P. Riley, President and Chief Executive Officer of First Interstate BancSystem, Inc.

DIVIDEND DECLARATION

On October 23, 2024, the Company’s board of directors declared a dividend of $0.47 per common share, payable on November 14, 2024, to common stockholders of record as of November 4, 2024. The dividend equates to a 6.3% annualized yield based on the $29.85 per share average closing price of the Company’s common stock as reported on NASDAQ during the third quarter of 2024.

1 Represents a Non-GAAP Financial Measure. See Non-GAAP Financial Measures included below for a reconciliation to this measure’s most directly comparable GAAP financial measure.

NET INTEREST INCOME

Net interest income increased $3.8 million, or 1.9%, to $205.5 million, during the third quarter of 2024, compared to net interest income of $201.7 million during the second quarter of 2024, primarily due to an increase in interest and fees on loans and a decrease in interest expense resulting from a decrease in average debt balances. The decrease in interest expense was partially offset by higher costs of interest-bearing deposits during the third quarter of 2024. Net interest income decreased $8.2 million, or 3.8%, during the third quarter of 2024 compared to the third quarter of 2023, primarily due to an increase in interest expense resulting from higher costs of interest-bearing deposits, partially offset by an increase in interest and fees on loans in the third quarter of 2024.

•Interest accretion attributable to the fair valuation of acquired loans from acquisitions contributed to net interest income during the third quarter of 2024, the second quarter of 2024, and the third quarter of 2023, in the amounts of $4.4 million, $5.1 million, and $5.2 million, respectively.

The net interest margin ratio was 3.01% for the third quarter of 2024, compared to 2.97% during the second quarter of 2024, and 3.05% during the third quarter of 2023. The net FTE interest margin ratio2 was 3.04% for the third quarter of 2024, compared to 3.00% during the second quarter of 2024, and 3.07% during the third quarter of 2023. Excluding interest accretion from the fair value of acquired loans, on a quarter-over-quarter basis, the adjusted net interest margin ratio (FTE)2, was 2.97%, an increase of 5 basis points from the prior quarter, primarily driven by loan yield expansion and lower interest expense resulting from decreased borrowings. Excluding interest accretion from the fair value of acquired loans, on a year-over-year basis, the adjusted net interest margin ratio (FTE) decreased 3 basis points, primarily as a result of higher interest-bearing deposit costs, which was partially offset by loan yield expansion and a modestly favorable change in the mix of earning assets.

PROVISION FOR CREDIT LOSSES

During the third quarter of 2024, the Company recorded a provision for credit losses of $19.8 million. This compares to a provision for credit losses of $9.0 million during the second quarter of 2024 and a reduction in the provision for credit losses of $0.1 million during the third quarter of 2023.

For the third quarter of 2024, the allowance for credit losses included net charge-offs of $27.4 million, or an annualized 0.60% of average loans outstanding, compared to net charge-offs of $13.5 million, or an annualized 0.30% of average loans outstanding, for the second quarter of 2024 and net charge-offs of $1.1 million, or an annualized 0.02% of average loans outstanding, for the third quarter of 2023. Net loan charge-offs in the third quarter of 2024 were composed of charge-offs of $29.1 million, including a $15.9 million metro office commercial real estate loan and a $6.2 million metro office construction real estate loan, which were offset by recoveries of $1.7 million during the third quarter of 2024. As noted, metro office charge-offs were $22.1 million. Net charge-offs within the remaining portfolio totaled 0.12% of average loans in the third quarter of 2024.

The Company’s allowance for credit losses as a percentage of period-end loans held for investment was 1.25% at September 30, 2024, compared to 1.28% at June 30, 2024 and 1.24% at September 30, 2023. Coverage of non-performing loans decreased to 129.2% at September 30, 2024, compared to 138.4% at June 30, 2024 and 268.0% at September 30, 2023.

NON-INTEREST INCOME


For the Quarter Ended	Sep 30, 2024		Jun 30, 2024		$ Change		% Change		Sep 30, 2023		$ Change		% Change
(Dollars in millions)
Payment services revenues	$	18.7	$	18.6	$	0.1	0.5	%	$	19.2	$	(0.5)	(2.6)	%
Mortgage banking revenues	1.7		1.7		—		—		2.0		(0.3)		(15.0)
Wealth management revenues	9.6		9.4		0.2		2.1		8.7		0.9		10.3
Service charges on deposit accounts	6.6		6.4		0.2		3.1		6.0		0.6		10.0
Other service charges, commissions, and fees	2.2		2.1		0.1		4.8		2.2		—		—

Other income	7.6		4.4		3.2		72.7		3.9		3.7		94.9

Total non-interest income	$	46.4	$	42.6	$	3.8	8.9	%	$	42.0	$	4.4	10.5	%

Non-interest income was $46.4 million for the third quarter of 2024, increasing $3.8 million compared to the second quarter of 2024 and increasing $4.4 million compared to the third quarter of 2023. The increases were primarily due to a recorded gain-on-sale of $2.6 million related to the sale of a branch during the third quarter of 2024.

2 Represents a Non-GAAP Financial Measure. See Non-GAAP Financial Measures included below for a reconciliation to this measure’s most directly comparable GAAP financial measure.

NON-INTEREST EXPENSE


For the Quarter Ended	Sep 30, 2024		Jun 30, 2024		$ Change		% Change		Sep 30, 2023		$ Change		% Change
(Dollars in millions)
Salaries and wages	$	70.9	$	66.3	$	4.6	6.9	%	$	65.4	$	5.5	8.4	%
Employee benefits	19.7		16.9		2.8		16.6		19.7		—		—
Occupancy and equipment	17.0		16.9		0.1		0.6		17.0		—		—
Other intangible amortization	3.6		3.7		(0.1)		(2.7)		3.9		(0.3)		(7.7)
Other expenses	48.2		51.1		(2.9)		(5.7)		54.6		(6.4)		(11.7)
Other real estate owned expense	—		2.0		(2.0)		(100.0)		0.5		(0.5)		(100.0)

Total non-interest expense	$	159.4	$	156.9	$	2.5	1.6	%	$	161.1	$	(1.7)	(1.1)	%

The Company’s non-interest expense was $159.4 million for the third quarter of 2024, an increase of $2.5 million from the second quarter of 2024 and a decrease of $1.7 million from the third quarter of 2023. Expenses for the third quarter included $3.8 million related to the CEO transition.

Salary and wages expense increased $4.6 million and $5.5 million during the third quarter of 2024 compared to the second quarter of 2024 and the third quarter of 2023, respectively. The increase when compared to the second quarter of 2024 was primarily due to the accrual of $3.8 million related to the CEO transition and the increase when compared to the third quarter of 2023 was primarily due to the accrual of $3.8 million related to the CEO transition, lower deferred loan costs, and higher short-term incentive accruals, partially offset by lower severance costs and lower salaries and wages from expense reduction initiatives undertaken by the Company in 2023.

Employee benefit expenses increased $2.8 million during the third quarter of 2024 compared to the second quarter of 2024, primarily due to an increase of $2.4 million in health insurance costs. Employee benefit expenses were unchanged compared to the third quarter of 2023.

Other expenses decreased $2.9 million during the third quarter of 2024 compared to the second quarter of 2024, primarily due to lower FDIC assessment fees and professional fees. Other expenses decreased $6.4 million during the third quarter of 2024 compared to the third quarter of 2023, primarily resulting from decreases in credit card reward accruals, professional fees, write-off of software costs, and reclassifications of new market tax credit amortization expenses, which moved to income tax expenses, as a result of the adoption of ASU 2023-02.

Other real estate owned expenses decreased $2.0 million during the third quarter of 2024 compared to the second quarter of 2024 and decreased $0.5 million compared to the third quarter of 2023. The quarter-over-quarter decrease was primarily due to the write down of two commercial properties in the second quarter of 2024.

BALANCE SHEET

Total assets decreased $694.0 million, or 2.3%, to $29,595.5 million as of September 30, 2024, from $30,289.5 million as of June 30, 2024, primarily due to decreases in loans, cash and cash equivalents, investment securities, and other assets. Total assets decreased $945.3 million, or 3.1%, from $30,540.8 million as of September 30, 2023, primarily due to decreases in investment securities, loans, and other assets which supported declines in deposits and securities sold under repurchase agreements, which was partially offset by an increase in cash and cash equivalents.

Investment securities decreased $126.0 million, or 1.5%, to $8,275.6 million as of September 30, 2024, from $8,401.6 million as of June 30, 2024, primarily resulting from normal pay-downs and maturities, partially offset by a $158.5 million increase in fair market values of investment securities during the period. Investment securities decreased $611.6 million, or 6.9%, from $8,887.2 million as of September 30, 2023, primarily resulting from normal pay-downs and maturities, partially offset by a $330.8 million increase in fair market values during the period.

The following table presents the composition and comparison of loans held for investment as of the quarters-ended:



	Sep 30, 2024		Jun 30, 2024		$ Change		% Change		Sep 30, 2023		$ Change		% Change
Real Estate:
Commercial	$	9,219.3	$	9,054.5	$	164.8	1.8	%	$	8,766.2	$	453.1	5.2	%
Construction	1,307.9		1,519.9		(212.0)		(13.9)		1,930.3		(622.4)		(32.2)
Residential	2,217.8		2,246.4		(28.6)		(1.3)		2,212.2		5.6		0.3
Agricultural	726.4		723.5		2.9		0.4		731.5		(5.1)		(0.7)
Total real estate	13,471.4		13,544.3		(72.9)		(0.5)		13,640.2		(168.8)		(1.2)
Consumer:
Indirect	742.2		733.7		8.5		1.2		751.7		(9.5)		(1.3)
Direct and advance lines	136.9		139.0		(2.1)		(1.5)		142.3		(5.4)		(3.8)
Credit card	76.4		76.1		0.3		0.4		71.6		4.8		6.7
Total consumer	955.5		948.8		6.7		0.7		965.6		(10.1)		(1.0)
Commercial	2,919.7		3,052.9		(133.2)		(4.4)		2,925.1		(5.4)		(0.2)
Agricultural	689.8		698.2		(8.4)		(1.2)		690.5		(0.7)		(0.1)
Other, including overdrafts	2.5		3.1		(0.6)		(19.4)		5.0		(2.5)		(50.0)
Deferred loan fees and costs	(11.8)		(12.3)		0.5		(4.1)		(13.1)		1.3		(9.9)
Loans held for investment, net of deferred loan fees and costs	$	18,027.1	$	18,235.0	$	(207.9)	(1.1)	%	$	18,213.3	$	(186.2)	(1.0)	%

Declines in the construction real estate loans are primarily a result of the conversion of loans to permanent commercial real estate financing. Commercial loans declined due to both declines in draws of operating line and payoffs.

The ratio of loans held for investment to deposits was 78.8%, as of September 30, 2024, compared to 79.7% as of June 30, 2024 and 76.9% as of September 30, 2023.

Total deposits decreased modestly by $6.6 million to $22,864.1 million as of September 30, 2024, from $22,870.7 million as of June 30, 2024, with decreases in non-interest bearing deposits, which were partially offset by increases in all interest-bearing categories. The decrease in total deposits was largely influenced by a large temporary deposit included on the balance sheet

at June 30, 2024 which was withdrawn early in the third quarter. Total deposits decreased $815.4 million, or 3.4%, from $23,679.5 million as of September 30, 2023, with decreases in all types of deposits except for demand and savings deposits.

Securities sold under repurchase agreements decreased $184.6 million, or 24.9%, to $557.2 million as of September 30, 2024, from $741.8 million as of June 30, 2024, and decreased $332.3 million, or 37.4%, from $889.5 million as of September 30, 2023, resulting from normal fluctuations in the liquidity needs of the Company’s clients.

Long-term debt decreased $246.1 million, or 64.2%, to $137.3 million as of September 30, 2024, from $383.4 million as of June 30, 2024, resulting from the recategorization of $250.0 million of 18-month Federal Home Loan Bank borrowings with remaining maturities of less than one year to other borrowed funds during the third quarter of 2024. Long-term debt was relatively stable when compared to September 30, 2023, which increased $16.5 million as of September 30, 2024 compared to September 30, 2023,

Debt we categorize as other borrowed funds is comprised of variable-rate, overnight and fixed-rate borrowings with remaining contractual tenors of up to one year through the Federal Home Loan Bank and Bank Term Funding Program. Other borrowed funds decreased $350.0 million, or 14.4%, to $2,080.0 million as of September 30, 2024, from $2,430.0 million as of June 30, 2024 The decrease was funded by debt repayments supported by lower cash balances held at quarter end, lower recorded investment securities, and lower recorded loans, which was offset by the $250.0 million advance that moved from long-term debt. Other borrowed funds increased $13.0 million from September 30, 2023.

The Company is considered to be “well-capitalized” as of September 30, 2024, having exceeded all regulatory capital adequacy requirements. During the third quarter of 2024, the Company paid regular common stock dividends of approximately $49.1 million, or $0.47 per share.

CREDIT QUALITY

As of September 30, 2024, non-performing assets increased $4.0 million, or 2.3%, to $178.9 million, compared to $174.9 million as of June 30, 2024, primarily due to an increase in non-accrual loans partially offset by the disposal of OREO properties.

Criticized loans decreased $14.7 million, or 2.4%, to $603.3 million as of September 30, 2024, from $618.0 million as of June 30, 2024, driven primarily as a result of $22.1 million of charge-offs related to a commercial real estate loan and a construction real estate loan in the metro office portfolio. The decrease was partially offset by downgrades in the commercial, agricultural real estate, and commercial real estate portfolios.

NON-GAAP FINANCIAL MEASURES

In addition to results presented in accordance with accounting principles generally accepted in the United States of America, or GAAP, this press release contains the following non-GAAP financial measures that management uses to evaluate our performance relative to our capital adequacy standards: (i) tangible common stockholders’ equity; (ii) tangible assets; (iii) tangible book value per common share; (iv) tangible common stockholders’ equity to tangible assets; (v) average tangible common stockholders’ equity; (vi) return on average tangible common stockholders’ equity; (vii) net FTE interest income; (viii) net FTE interest margin ratio; (ix) adjusted net FTE interest income; and (x) adjusted net FTE interest margin ratio. Tangible common stockholders’ equity is calculated as total common stockholders’ equity less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible assets are calculated as total assets less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible book value per common share is calculated as tangible common stockholders’ equity divided by common shares outstanding. Tangible common stockholders’ equity to tangible assets is calculated as tangible common stockholders’ equity divided by tangible assets. Average tangible common stockholders’ equity is calculated as average total stockholders’ equity less average goodwill and other intangible assets (excluding mortgage servicing rights). Return on average tangible common stockholders’ equity is calculated as annualized net income available to common shareholders divided by average tangible common stockholders’ equity. Net FTE interest income is calculated as net interest income, adjusted to include its FTE interest income. Net FTE interest margin ratio is calculated as net FTE interest income divided by average interest-earning assets. Adjusted net FTE interest income is calculated as net FTE interest income less purchase accounting interest accretion on acquired loans. Adjusted net FTE interest margin ratio is calculated as annualized adjusted net FTE interest income divided by average interest earning assets. These non-GAAP financial measures may not be comparable to similarly titled measures reported by other companies because other companies may not calculate these non-GAAP measures in the same manner. They also should not be considered in isolation or as a substitute for measures prepared in accordance with GAAP.

The Company adjusts the most directly comparable capital adequacy GAAP financial measures to the non-GAAP financial measures described in subclauses (i) through (vi) above to exclude goodwill and other intangible assets (except mortgage servicing rights), adjusts its GAAP net interest income to include fully taxable equivalent adjustments and further adjusts its net interest income on a fully taxable equivalent basis to exclude purchase accounting interest accretion. Management believes these non-GAAP financial measures, which are intended to complement the capital ratios defined by banking regulators and to present on a consistent basis our and our acquired companies’ organic continuing operations without regard to acquisition costs and other adjustments that we consider to be unpredictable and dependent on a significant number of factors that are outside our control, are useful to investors in evaluating the Company’s performance because, as a general matter, they either do not represent an actual cash expense and are inconsistent in amount and frequency depending upon the timing and size of our acquisitions (including the size, complexity and/or volume of past acquisitions, which may drive the magnitude of acquisition related costs, but may not be indicative of the size, complexity and/or volume of future acquisitions or related costs), or they cannot be anticipated or estimated in a particular period (in particular as it relates to unexpected recovery amounts). This impacts the ratios that are important to analysts and allows investors to compare certain aspects of the Company’s capitalization to other companies.

See the Non-GAAP Financial Measures table included herein and the textual discussion for a reconciliation of the above-described non-GAAP financial measures to their most directly comparable GAAP financial measures.

Cautionary Note Regarding Forward-Looking Statements and Factors that Could Affect Future Results

This press release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, and Rule 3b-6 promulgated thereunder, that involve inherent risks and uncertainties. Any statements about our plans, objectives, expectations, strategies, beliefs, or future performance or events constitute forward-looking statements. Such statements are identified by words or phrases such as “believes,” “expects,” “anticipates,” “plans,” “trends,” “objectives,” “continues” or similar expressions, or future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” “may,” or similar expressions. Forward-looking statements involve known and unknown risks, uncertainties, assumptions, estimates and other important factors that change over time and could cause actual results to differ materially from any results, performance or events expressed or implied by such forward-looking statements. Furthermore, the following factors, among others, may cause actual results to differ materially from current expectations in the forward-looking statements, including those set forth in this press release:

•new or changes in existing, governmental regulations;

•negative developments in the banking industry and increased regulatory scrutiny;

•tax legislative initiatives or assessments;

•more stringent capital requirements, to the extent they may become applicable to us;

•changes in accounting standards;

•any failure to comply with applicable laws and regulations, including, but not limited to, the Community Reinvestment Act and fair lending laws, the USA PATRIOT ACT of 2001, the Office of Foreign Asset Control guidelines and requirements, the Bank Secrecy Act, and the related Financial Crimes Enforcement Network and Federal Financial Institutions Examination Council Guidelines and regulations;

•federal deposit insurance increases;

•lending risks and risks associated with loan sector concentrations;

•a decline in economic conditions that could reduce demand for our products and services and negatively impact the credit quality of loans;

•loan credit losses exceeding estimates;

•exposure to losses in collateralized loan obligation securities;

•changes to United States trade policies, including the imposition of tariffs and retaliatory tariffs;

•the soundness of other financial institutions;

•the ability to meet cash flow needs and availability of financing sources for working capital and other needs;

•a loss of deposits or a change in product mix that increases the Company’s funding costs;

•inability to access funding or to monetize liquid assets;

•changes in interest rates;

•interest rate effect on the value of our investment securities;

•cybersecurity risks, including “denial-of-service attacks,” “hacking,” and “identity theft” that could result in the disclosure of confidential information;

•privacy, information security, and data protection laws, rules, and regulations that affect or limit how we collect and use personal information;

•the potential impairment of our goodwill and other intangible assets;

•our reliance on other companies that provide key components of our business infrastructure;

•events that may tarnish our reputation;

•main stream and social media contagion;

•the loss of the services of key members of our management team and directors;

•our ability to attract and retain qualified employees to operate our business;

•costs associated with repossessed properties, including environmental remediation;

•the effectiveness of our systems of internal operating and accounting controls;

•our ability to implement technology-facilitated products and services or be successful in marketing these products and services to our clients;

•difficulties we may face in combining the operations of acquired entities or assets with our own operations or assessing the effectiveness of businesses in which we make strategic investments or with which we enter into strategic contractual relationships;

•competition from new or existing financial institutions and non-banks;

•investing in technology;

•incurrence of significant costs related to mergers and related integration activities;

•the volatility in the price and trading volume of our common stock;

•“anti-takeover” provisions in our certificate of incorporation and regulations, which may make it more difficult for a third party to acquire control of us even in circumstances that could be deemed beneficial to stockholders;

•changes in our dividend policy or our ability to pay dividends;

•our common stock not being an insured deposit;

•the potential dilutive effect of future equity issuances;

•the subordination of our common stock to our existing and future indebtedness;

•the impact of the combined deficiencies resulting in a material weakness in our internal control over financial reporting;

•the effect of global conditions, earthquakes, volcanoes, tsunamis, floods, fires, drought, and other natural catastrophic events; and

•the impact of climate change and environmental sustainability matters.

These factors are not necessarily all the factors that could cause our actual results, performance, or achievements to differ materially from those expressed in or implied by any of our forward-looking statements. Other unknown or unpredictable factors also could harm our results.

All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements set forth above and included and described in more detail in our periodic reports filed with the Securities and Exchange Commission, or SEC, under the Securities Exchange Act of 1934, as amended, under the caption “Risk Factors.” Interested parties are urged to read in their entirety such risk factors prior to making any investment decision with respect to the Company. Forward-looking statements speak only as of the date they are made, and we do not undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future events, changes in assumptions or changes in other factors affecting forward-looking statements, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

Third Quarter 2024 Conference Call for Investors

First Interstate BancSystem, Inc. will host a conference call to discuss the results for the third quarter of 2024 at 11:00 a.m. Eastern Time (9:00 a.m. Mountain Time) on Friday, October 25, 2024. The conference call will be accessible by telephone and through the Internet. Participants may join the call by dialing 1-800-343-4136; the access code is FIBANC. To participate via the Internet, visit www.FIBK.com. The call will be recorded and made available for replay on October 25, 2024, after 1:00 p.m. Eastern Time (11:00 a.m. Mountain Time), through November 24, 2024, prior to 9:00 a.m. Eastern Time (7:00 a.m. Mountain Time), by dialing 1-800-283-4642; the access code is 24978. The call will also be archived on our website, www.FIBK.com, for one year.

About First Interstate BancSystem, Inc.

First Interstate BancSystem, Inc. is a financial and bank holding company focused on community banking. Incorporated in 1971 and headquartered in Billings, Montana, the Company operates banking offices, including detached drive-up facilities, in communities across Arizona, Colorado, Idaho, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, North Dakota, Oregon, South Dakota, Washington, and Wyoming, in addition to offering online and mobile banking services. Through our bank subsidiary, First Interstate Bank, the Company delivers a comprehensive range of banking products and services to individuals, businesses, municipalities, and others throughout the Company’s market areas.

Contact:

David Della Camera, CFA

NASDAQ: FIBK

Deputy Chief Financial Officer
First Interstate BancSystem, Inc.
(406) 255-5363
investor.relations@fib.com

www.FIBK.com

(FIBK-ER)

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Consolidated Statements of Income

(Unaudited)


	Quarter Ended										% Change
(In millions, except % and per share data)	Sep 30, 2024		Jun 30, 2024		Mar 31, 2024		Dec 31, 2023		Sep 30, 2023		3Q24 vs 2Q24		3Q24 vs 3Q23
Net interest income	$	205.5	$	201.7	$	200.1	$	207.8	$	213.7	1.9	%	(3.8)	%
Net interest income on a fully-taxable equivalent ("FTE") basis	207.1		203.4		201.8		209.5		215.4		1.8		(3.9)
Provision for (reduction in) credit losses	19.8		9.0		5.3		5.4		(0.1)		120.0		NM
Non-interest income:
Payment services revenues	18.7		18.6		18.4		18.4		19.2		0.5		(2.6)
Mortgage banking revenues	1.7		1.7		1.7		1.5		2.0		—		(15.0)
Wealth management revenues	9.6		9.4		9.2		8.8		8.7		2.1		10.3
Service charges on deposit accounts	6.6		6.4		6.0		6.0		6.0		3.1		10.0
Other service charges, commissions, and fees	2.2		2.1		2.2		2.5		2.2		4.8		—
Total fee-based revenues	38.8		38.2		37.5		37.2		38.1		1.6		1.8
Investment securities gain	—		—		—		—		—		—		—
Other income	7.6		4.4		4.6		7.3		3.9		72.7		94.9

Total non-interest income	46.4		42.6		42.1		44.5		42.0		8.9		10.5
Non-interest expense:
Salaries and wages	70.9		66.3		65.2		64.0		65.4		6.9		8.4
Employee benefits	19.7		16.9		19.3		13.5		19.7		16.6		—
Occupancy and equipment	17.0		16.9		17.3		17.4		17.0		0.6		—
Other intangible amortization	3.6		3.7		3.7		3.9		3.9		(2.7)		(7.7)
Other expenses	48.2		51.1		52.7		67.0		54.6		(5.7)		(11.7)
Other real estate owned expense	—		2.0		2.0		0.2		0.5		(100.0)		(100.0)

Total non-interest expense	159.4		156.9		160.2		166.0		161.1		1.6		(1.1)
Income before income tax	72.7		78.4		76.7		80.9		94.7		(7.3)		(23.2)
Provision for income tax	17.2		18.4		18.3		19.4		22.0		(6.5)		(21.8)
Net income	$	55.5	$	60.0	$	58.4	$	61.5	$	72.7	(7.5)	%	(23.7)	%

Weighted-average basic shares outstanding	102,971		102,937		102,844		103,629		103,822		—	%	(0.8)	%
Weighted-average diluted shares outstanding	103,234		103,093		103,040		103,651		103,826		0.1		(0.6)
Earnings per share - basic	$	0.54	$	0.58	$	0.57	$	0.59	$	0.70	(6.9)		(22.9)
Earnings per share - diluted	0.54		0.58		0.57		0.59		0.70		(6.9)		(22.9)

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Consolidated Balance Sheets

(Unaudited)


											% Change
(In millions, except % and per share data)	Sep 30, 2024		Jun 30, 2024		Mar 31, 2024		Dec 31, 2023		Sep 30, 2023		3Q24 vs 2Q24		3Q24 vs 3Q23
Assets:
Cash and due from banks	$	438.9	$	390.2	$	315.8	$	378.2	$	371.5	12.5	%	18.1	%
Interest-bearing deposits in banks	259.6		568.2		319.1		199.7		219.5		(54.3)		18.3
Federal funds sold	0.1		0.1		0.1		0.1		2.1		—		(95.2)
Cash and cash equivalents	698.6		958.5		635.0		578.0		593.1		(27.1)		17.8

Investment securities, net	8,275.6		8,401.6		8,626.1		9,049.4		8,887.2		(1.5)		(6.9)
Investment in Federal Home Loan Bank and Federal Reserve Bank stock	155.5		182.3		178.4		223.2		189.5		(14.7)		(17.9)
Loans held for sale, at fair value	20.9		22.3		22.7		47.4		59.1		(6.3)		(64.6)
Loans held for investment	18,027.1		18,235.0		18,202.8		18,279.6		18,213.3		(1.1)		(1.0)
Allowance for credit losses	(225.4)		(232.8)		(227.7)		(227.7)		(226.7)		(3.2)		(0.6)
Net loans held for investment	17,801.7		18,002.2		17,975.1		18,051.9		17,986.6		(1.1)		(1.0)
Goodwill and intangible assets (excluding mortgage servicing rights)	1,199.3		1,202.9		1,206.6		1,210.3		1,214.1		(0.3)		(1.2)
Company owned life insurance	511.0		507.6		504.7		502.4		500.8		0.7		2.0
Premises and equipment	432.7		436.5		439.9		444.3		446.3		(0.9)		(3.0)
Other real estate owned	4.4		6.7		14.4		16.5		11.6		(34.3)		(62.1)
Mortgage servicing rights	26.3		27.0		27.6		28.3		29.1		(2.6)		(9.6)
Other assets	469.5		541.9		514.3		519.5		623.4		(13.4)		(24.7)
Total assets	$	29,595.5	$	30,289.5	$	30,144.8	$	30,671.2	$	30,540.8	(2.3)	%	(3.1)	%

Liabilities and stockholders' equity:
Deposits	$	22,864.1	$	22,870.7	$	22,810.0	$	23,323.1	$	23,679.5	—	%	(3.4)	%
Securities sold under repurchase agreements	557.2		741.8		794.2		782.7		889.5		(24.9)		(37.4)
Long-term debt	137.3		383.4		370.8		120.8		120.8		(64.2)		13.7
Other borrowed funds	2,080.0		2,430.0		2,342.0		2,603.0		2,067.0		(14.4)		0.6
Subordinated debentures held by subsidiary trusts	163.1		163.1		163.1		163.1		163.1		—		—
Other liabilities	428.0		475.2		455.0		451.0		535.4		(9.9)		(20.1)
Total liabilities	26,229.7		27,064.2		26,935.1		27,443.7		27,455.3		(3.1)		(4.5)
Stockholders' equity:
Common stock	2,457.4		2,453.9		2,450.7		2,448.9		2,484.9		0.1		(1.1)
Retained earnings	1,163.3		1,156.9		1,145.9		1,135.1		1,122.3		0.6		3.7
Accumulated other comprehensive loss	(254.9)		(385.5)		(386.9)		(356.5)		(521.7)		(33.9)		(51.1)
Total stockholders' equity	3,365.8		3,225.3		3,209.7		3,227.5		3,085.5		4.4		9.1
Total liabilities and stockholders' equity	$	29,595.5	$	30,289.5	$	30,144.8	$	30,671.2	$	30,540.8	(2.3)	%	(3.1)	%

Common shares outstanding at period end	104,530		104,561		104,572		103,942		105,011		—	%	(0.5)	%
Book value per common share at period end	$	32.20	$	30.85	$	30.69	$	31.05	$	29.38	4.4		9.6
Tangible book value per common share at period end**	20.73		19.34		19.16		19.41		17.82		7.2		16.3




**Non-GAAP financial measure - see Non-GAAP Financial Measures included herein for a reconciliation of book value per common share (GAAP) at period end to tangible book value per common share (non-GAAP) at period end.

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Loans and Deposits

(Unaudited)


											% Change
(In millions, except %)	Sep 30, 2024		Jun 30, 2024		Mar 31, 2024		Dec 31, 2023		Sep 30, 2023		3Q24 vs 2Q24		3Q24 vs 3Q23

Loans held for investment:
Real Estate:
Commercial	$	9,219.3	$	9,054.5	$	9,060.4	$	8,869.2	$	8,766.2	1.8	%	5.2	%
Construction	1,307.9		1,519.9		1,609.2		1,826.5		1,930.3		(13.9)		(32.2)
Residential	2,217.8		2,246.4		2,258.4		2,244.3		2,212.2		(1.3)		0.3
Agricultural	726.4		723.5		719.7		716.8		731.5		0.4		(0.7)
Total real estate	13,471.4		13,544.3		13,647.7		13,656.8		13,640.2		(0.5)		(1.2)
Consumer:
Indirect	742.2		733.7		739.9		740.9		751.7		1.2		(1.3)
Direct	136.9		139.0		136.7		141.6		142.3		(1.5)		(3.8)
Credit card	76.4		76.1		72.6		76.5		71.6		0.4		6.7
Total consumer	955.5		948.8		949.2		959.0		965.6		0.7		(1.0)
Commercial	2,919.7		3,052.9		2,922.2		2,906.8		2,925.1		(4.4)		(0.2)
Agricultural	689.8		698.2		696.0		769.4		690.5		(1.2)		(0.1)
Other	2.5		3.1		0.2		0.1		5.0		(19.4)		(50.0)
Deferred loan fees and costs	(11.8)		(12.3)		(12.5)		(12.5)		(13.1)		(4.1)		(9.9)
Loans held for investment	$	18,027.1	$	18,235.0	$	18,202.8	$	18,279.6	$	18,213.3	(1.1)	%	(1.0)	%






Deposits:
Non-interest-bearing	$	5,919.0	$	6,174.0	$	5,900.3	$	6,029.6	$	6,402.6	(4.1)	%	(7.6)	%
Interest-bearing:
Demand	6,261.4		6,122.3		6,103.6		6,507.8		6,317.9		2.3		(0.9)
Savings	7,805.5		7,733.6		7,872.2		7,775.8		7,796.3		0.9		0.1
Time, $250 and over	818.6		786.1		819.3		811.6		817.1		4.1		0.2
Time, other	2,059.6		2,054.7		2,114.6		2,198.3		2,345.6		0.2		(12.2)
Total interest-bearing	16,945.1		16,696.7		16,909.7		17,293.5		17,276.9		1.5		(1.9)
Total deposits	$	22,864.1	$	22,870.7	$	22,810.0	$	23,323.1	$	23,679.5	—	%	(3.4)	%

Total core deposits (1)	$	22,045.5	$	22,084.6	$	21,990.7	$	22,511.5	$	22,862.4	(0.2)	%	(3.6)	%

(1) Core deposits are defined as total deposits less time deposits, $250 thousand and over, and brokered deposits.
NM - not meaningful

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Credit Quality

(Unaudited)


																% Change
(In millions, except %)	Sep 30, 2024			Jun 30, 2024			Mar 31, 2024			Dec 31, 2023			Sep 30, 2023			3Q24 vs 2Q24		3Q24 vs 3Q23

Allowance for Credit Losses:
Allowance for credit losses	$	225.4		$	232.8		$	227.7		$	227.7		$	226.7		(3.2)	%	(0.6)	%
As a percentage of loans held for investment	1.25		%	1.28		%	1.25		%	1.25		%	1.24		%
As a percentage of non-accrual loans	130.52			140.58			132.38			214.00			278.50

Net loan charge-offs during quarter	$	27.4		$	13.5		$	8.4		$	4.8		$	1.1		103.0	%	NM
Annualized as a percentage of average loans	0.60		%	0.30		%	0.18		%	0.10		%	0.02		%

Non-Performing Assets:
Non-accrual loans	$	172.7		$	165.6		$	172.0		$	106.4		$	81.4		4.3	%	112.2	%
Accruing loans past due 90 days or more	1.8			2.6			3.0			4.9			3.2			(30.8)		(43.8)
Total non-performing loans	174.5			168.2			175.0			111.3			84.6			3.7		106.3
Other real estate owned	4.4			6.7			14.4			16.5			11.6			(34.3)		(62.1)
Total non-performing assets	$	178.9		$	174.9		$	189.4		$	127.8		$	96.2		2.3	%	86.0	%

Non-performing assets as a percentage of:
Loans held for investment and OREO	0.99		%	0.96		%	1.04		%	0.70		%	0.53		%
Total assets	0.60			0.58			0.63			0.42			0.31

Non-accrual loans to loans held for investment	0.96			0.91			0.94			0.58			0.45

Accruing Loans 30-89 Days Past Due	$	40.7		$	46.4		$	62.8		$	67.3		$	51.2		(12.3)	%	(20.5)	%


Criticized Loans:
Special Mention	$	188.9		$	162.7		$	160.1		$	210.5		$	197.3		16.1	%	(4.3)	%
Substandard	365.9			409.3			405.8			457.1			414.6			(10.6)		(11.7)
Doubtful	48.5			46.0			64.1			20.7			21.0			5.4		131.0
Total	$	603.3		$	618.0		$	630.0		$	688.3		$	632.9		(2.4)	%	(4.7)	%



NM - not meaningful

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Selected Ratios - Annualized

(Unaudited)


	At or for the Quarter ended:
	Sep 30, 2024				Jun 30, 2024			Mar 31, 2024			Dec 31, 2023			Sep 30, 2023
Annualized Financial Ratios (GAAP)
Return on average assets	0.74		%		0.80		%	0.77		%	0.80		%	0.94		%
Return on average common stockholders' equity	6.68				7.55			7.28			7.77			9.20
Yield on average earning assets	4.83				4.80			4.74			4.69			4.63
Cost of average interest-bearing liabilities	2.41				2.39			2.39			2.24			2.09
Interest rate spread	2.42				2.41			2.35			2.45			2.54
Efficiency ratio	61.85				62.71			64.62			64.25			61.48
Loans held for investment to deposit ratio	78.84				79.73			79.80			78.38			76.92

Annualized Financial Ratios - Operating** (Non-GAAP)
Net FTE interest margin ratio	3.04		%		3.00		%	2.93		%	3.01		%	3.07		%
Tangible book value per common share	$	20.73			$	19.34		$	19.16		$	19.41		$	17.82
Tangible common stockholders' equity to tangible assets	7.63		%		6.95		%	6.92		%	6.85		%	6.38		%
Return on average tangible common stockholders' equity	10.48				12.12			11.63			12.65			15.04

Consolidated Capital Ratios
Total risk-based capital to total risk-weighted assets	14.11		%	*	13.80		%	13.64		%	13.28		%	13.19		%
Tier 1 risk-based capital to total risk-weighted assets	11.83			*	11.53			11.37			11.08			11.02
Tier 1 common capital to total risk-weighted assets	11.83			*	11.53			11.37			11.08			11.02
Leverage Ratio	8.57			*	8.44			8.28			8.22			8.22




*Preliminary estimate - may be subject to change. The regulatory capital ratios presented include the assumption of the transitional method as a result of legislation by the United States Congress to provide relief for the economy and financial institutions in the United States from the COVID‑19 pandemic. The referenced relief ends on December 31, 2024, which allows a total five-year phase-in of the impact of CECL on capital and relief over the next two years for the impact on the allowance for credit losses resulting from the COVID‑19 pandemic.
**Non-GAAP financial measures - see Non-GAAP Financial Measures included herein for a reconciliation of net interest margin to net FTE interest margin, book value per common share to tangible book value per common share, return on average common stockholders’ equity (GAAP) to return on average tangible common stockholders’ equity, and tangible common stockholders’ equity to tangible assets (non-GAAP).

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Average Balance Sheets

(Unaudited)



	Three Months Ended
	September 30, 2024						June 30, 2024						September 30, 2023
(In millions, except %)	Average Balance		Interest(2)		Average Rate		Average Balance		Interest(2)		Average Rate		Average Balance		Interest(2)		Average Rate
Interest-earning assets:
Loans (1)	$	18,209.1	$	260.3	5.69	%	$	18,253.9	$	254.4	5.61	%	$	18,317.4	$	251.5	5.45	%
Investment securities
Taxable	8,209.7		60.7		2.94		8,311.6		62.3		3.01		8,877.6		66.0		2.95
Tax-exempt	185.3		0.9		1.93		187.8		0.8		1.71		190.4		0.9		1.88
Investment in FHLB and FRB stock	176.0		2.8		6.33		185.5		3.3		7.16		202.6		2.9		5.68
Interest-bearing deposits in banks	353.1		4.9		5.52		348.0		4.9		5.66		208.5		3.0		5.71
Federal funds sold	0.1		—		—		0.1		—		—		0.3		—		—
Total interest-earning assets	$	27,133.3	$	329.6	4.83	%	$	27,286.9	$	325.7	4.80	%	$	27,796.8	$	324.3	4.63	%
Non-interest-earning assets	2,813.6						2,853.7						2,955.5
Total assets	$	29,946.9					$	30,140.6					$	30,752.3
Interest-bearing liabilities:
Demand deposits	$	6,143.9	$	15.1	0.98	%	$	6,142.9	$	13.9	0.91	%	$	6,361.5	$	13.3	0.83	%
Savings deposits	7,763.4		42.2		2.16		7,760.3		40.8		2.11		7,838.4		33.6		1.70
Time deposits	2,863.1		26.9		3.74		2,863.4		26.2		3.68		2,938.0		21.9		2.96
Repurchase agreements	643.9		1.4		0.86		775.5		1.9		0.99		895.2		1.7		0.75
Other borrowed funds	2,526.6		32.0		5.04		2,501.9		31.8		5.11		2,396.3		33.6		5.56
Long-term debt	147.2		1.6		4.32		377.2		4.4		4.69		120.8		1.5		4.93
Subordinated debentures held by subsidiary trusts	163.1		3.3		8.05		163.1		3.3		8.14		163.1		3.3		8.03
Total interest-bearing liabilities	$	20,251.2	$	122.5	2.41	%	$	20,584.3	$	122.3	2.39	%	$	20,713.3	$	108.9	2.09	%
Non-interest-bearing deposits	5,927.2						5,868.7						6,401.2
Other non-interest-bearing liabilities	461.4						492.3						504.0
Stockholders’ equity	3,307.1						3,195.3						3,133.8
Total liabilities and stockholders’ equity	$	29,946.9					$	30,140.6					$	30,752.3
Net FTE interest income (non-GAAP)(3)			$	207.1					$	203.4					$	215.4
Less FTE adjustments (2)			(1.6)						(1.7)						(1.7)
Net interest income from consolidated statements of income			$	205.5					$	201.7					$	213.7
Interest rate spread					2.42	%					2.41	%					2.54	%
Net interest margin					3.01						2.97						3.05
Net FTE interest margin (non-GAAP)(3)					3.04						3.00						3.07
Cost of funds, including non-interest-bearing demand deposits (4)					1.86						1.86						1.59

(1) Average loan balances include loans held for sale and loans held for investment, net of deferred fees and costs, which include non-accrual loans. Interest income includes amortization of deferred loan fees net of deferred loan costs, which is not material.
(2) Management believes fully taxable equivalent, or FTE, interest income is useful to investors in evaluating the Company’s performance as a comparison of the returns between a tax-free investment and a taxable alternative. The Company adjusts interest income and average rates for tax exempt loans and securities to an FTE basis utilizing a 21.00% tax rate.
(3) Non-GAAP financial measure - see Non-GAAP Financial Measures included herein for a reconciliation to GAAP measures.
(4) Calculated by dividing total annualized interest on interest-bearing liabilities by the sum of total interest-bearing liabilities plus non-interest-bearing deposits.

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Non-GAAP Financial Measures

(Unaudited)



		As of or For the Quarter Ended
(In millions, except % and per share data)		Sep 30, 2024			Jun 30, 2024			Mar 31, 2024			Dec 31, 2023			Sep 30, 2023
Total common stockholders' equity (GAAP)	(A)	$	3,365.8		$	3,225.3		$	3,209.7		$	3,227.5		$	3,085.5
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,199.3			1,202.9			1,206.6			1,210.3			1,214.1
Tangible common stockholders' equity (Non-GAAP)	(B)	$	2,166.5		$	2,022.4		$	2,003.1		$	2,017.2		$	1,871.4

Total assets (GAAP)		$	29,595.5		$	30,289.5		$	30,144.8		$	30,671.2		$	30,540.8
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,199.3			1,202.9			1,206.6			1,210.3			1,214.1
Tangible assets (Non-GAAP)	(C)	$	28,396.2		$	29,086.6		$	28,938.2		$	29,460.9		$	29,326.7

Average Balances:
Total common stockholders' equity (GAAP)	(D)	$	3,307.1		$	3,195.3		$	3,228.4		$	3,140.3		$	3,133.8
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,201.0			1,204.6			1,208.4			1,212.1			1,216.0
Average tangible common stockholders' equity (Non-GAAP)	(E)	$	2,106.1		$	1,990.7		$	2,020.0		$	1,928.2		$	1,917.8

Net interest income	(F)	$	205.5		$	201.7		$	200.1		$	207.8		$	213.7
FTE interest income		1.6			1.7			1.7			1.7			1.7
Net FTE interest income (Non-GAAP)	(G)	207.1			203.4			201.8			209.5			215.4
Less purchase accounting accretion		4.4			5.1			6.5			5.4			5.2

Adjusted net FTE interest income (Non-GAAP)	(H)	$	202.7		$	198.3		$	195.3		$	204.1		$	210.2

Average interest-earning assets	(I)	$	27,133.3		$	27,286.9		$	27,699.6		$	27,569.4		$	27,796.8



Total quarterly average assets	(J)	29,946.9			30,140.6			30,525.2			30,507.7			30,752.3
Annualized net income available to common shareholders	(K)	220.8			241.3			234.9			244.0			288.4
Common shares outstanding	(L)	104,530			104,561			104,572			103,942			105,011

Return on average assets (GAAP)	(K) / (J)	0.74		%	0.80		%	0.77		%	0.80		%	0.94		%
Return on average common stockholders' equity (GAAP)	(K) / (D)	6.68			7.55			7.28			7.77			9.20
Average common stockholders' equity to average assets (GAAP)	(D) / (J)	11.04			10.60			10.58			10.29			10.19
Book value per common share (GAAP)	(A) / (L)	$	32.20		$	30.85		$	30.69		$	31.05		$	29.38
Tangible book value per common share (Non-GAAP)	(B) / (L)	20.73			19.34			19.16			19.41			17.82
Tangible common stockholders' equity to tangible assets (Non-GAAP)	(B) / (C)	7.63		%	6.95		%	6.92		%	6.85		%	6.38		%
Return on average tangible common stockholders' equity (Non-GAAP)	(K) / (E)	10.48			12.12			11.63			12.65			15.04
Net interest margin (GAAP)	(F*) / (I)	3.01			2.97			2.91			2.99			3.05
Net FTE interest margin (Non-GAAP)	(G*) / (I)	3.04			3.00			2.93			3.01			3.07
Adjusted FTE net interest margin (Non-GAAP)	(H*) / (I)	2.97			2.92			2.84			2.94			3.00

*Annualized

3Q 2024 Investor Presentation Exhibit 99.2 October 24, 2024

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve inherent risks and uncertainties. Any statements about our plans, objectives, expectations, strategies, beliefs, or future performance or events constitute forward-looking statements. Such statements are identified by words or phrases such as “believes,” “expects,” “anticipates,” “plans,” “trends,” “objectives,” “continues”, “projected”, or similar expressions, or future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” “may” or similar expressions. Forward- looking statements involve known and unknown risks, uncertainties, assumptions, estimates and other important factors that could cause actual results to differ materially from any results, performance or events expressed or implied by such forward-looking statements. The following factors, among others, may cause actual results to differ materially from current expectations in the forward-looking statements, including those set forth in this presentation: new or changes in existing, governmental regulations; negative developments in the banking industry and increased regulatory scrutiny; tax legislative initiatives or assessments; more stringent capital requirements, to the extent they may become applicable to us; changes in accounting standards; any failure to comply with applicable laws and regulations, including, but not limited to, the Community Reinvestment Act and fair lending laws, the USA PATRIOT ACT of 2001, the Office of Foreign Asset Control guidelines and requirements, the Bank Secrecy Act, and the related Financial Crimes Enforcement Network and Federal Financial Institutions Examination Council Guidelines and regulations; federal deposit insurance increases; lending risks and risks associated with loan sector concentrations; a decline in economic conditions that could reduce demand for our products and services and negatively impact the credit quality of loans; loan credit losses exceeding estimates; exposure to losses in collateralized loan obligation securities; changes to United States trade policies, including the imposition of tariffs and retaliatory tariffs; the soundness of other financial institutions; the ability to meet cash flow needs and availability of financing sources for working capital and other needs; a loss of deposits or a change in product mix that increases the Company’s funding costs; inability to access funding or to monetize liquid assets; changes in interest rates; interest rate effect on the value of our investment securities; cybersecurity risks, including “denial-of- service attacks,” “hacking,” and “identity theft” that could result in the disclosure of confidential information; privacy, information security, and data protection laws, rules, and regulations that affect or limit how we collect and use personal information; the potential impairment of our goodwill and other intangible assets; our reliance on other companies that provide key components of our business infrastructure; events that may tarnish our reputation; main stream and social media contagion; the loss of the services of key members of our management team and directors; our ability to attract and retain qualified employees to operate our business; costs associated with repossessed properties, including environmental remediation; the effectiveness of our systems of internal operating and accounting controls; our ability to implement technology-facilitated products and services or be successful in marketing these products and services to our clients; difficulties we may face in combining the operations of acquired entities or assets with our own operations or assessing the effectiveness of businesses in which we make strategic investments or with which we enter into strategic contractual relationships; competition from new or existing financial institutions and non-banks; investing in technology; incurrence of significant costs related to mergers and related integration activities; the volatility in the price and trading volume of our common stock; “anti-takeover” provisions in our certificate of incorporation and regulations, which may make it more difficult for a third party to acquire control of us even in circumstances that could be deemed beneficial to stockholders; changes in our dividend policy or our ability to pay dividends; our common stock not being an insured deposit; the potential dilutive effect of future equity issuances; the subordination of our common stock to our existing and future indebtedness; the impact of the combined deficiencies resulting in a material weakness in our internal control over financial reporting; the effect of global conditions, earthquakes, volcanoes, tsunamis, floods, fires, drought, and other natural catastrophic events; and the impact of climate change and environmental sustainability matters. The foregoing factors are not necessarily all of the factors that could cause our actual results, performance or achievements to differ materially from those expressed in or implied by any of our forward-looking statements. Other unknown or unpredictable factors also could harm our results. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements set forth above and included in our periodic reports filed with the Securities and Exchange Commission, or SEC, under the Securities Exchange Act of 1934, as amended, under the caption “Risk Factors”. Interested parties are urged to read in their entirety such risk factors prior to making any investment decision with respect to the Company. Forward-looking statements speak only as of the date they are made and we do not undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future events, changes in assumptions or changes in other factors affecting forward- looking statements, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements. 2

FIRST INTERSTATE BANCSYSTEM, INC. OVERVIEW Premier community banking institution in growing markets throughout the Midwest and Pacific Northwest Financial Highlights Balance Sheet Capital Assets $29.6 Billion Total RBC3** 14.11% LHFI1 $18.0 Billion CET14** 11.83% Deposits $22.9 Billion Leverage** 8.57% ACL2/LHFI 1.25% TCE ratio5 7.63% 1Loans held for investment (LHFI) 3Risk based capital (RBC) 2Allowance for credit losses (ACL) 4Common equity tier-1 (CET1) 5Tangible common equity (TCE) (Non-GAAP) Corporate Overview Headquarters Billings, MT Exchange/Listing NASDAQ: FIBK Market Capitalization* $3.2 Billion Annualized Dividend Yield 6.3% Branch Network 299 banking offices Sub Debt Rating Kroll BBB 3 299 banking offices in 14 states * Calculated using closing stock price of $30.68 as of 09/30/2024 ** Preliminary estimates - may be subject to change

Earnings • Net income of $55.5 million, or $0.54 per share for the third quarter of 2024. • Net interest margin (NIM), on a fully taxable equivalent (“FTE”) basis1, of 3.04%, an increase of 4 basis points from the second quarter of 2024; adjusted FTE NIM1 of 2.97%, an increase of 5 basis points from the second quarter of 2024. • Efficiency ratio2 of 61.8% for the third quarter of 2024; Non-interest expense/average assets of 2.12%, which includes $3.8 million of CEO transition related expenses. Non-interest expense/average assets of 2.07% excluding CEO transition related expenses. Balance Sheet • Loans decreased by $207.9 million, or 4.4% annualized, from the second quarter of 2024, driven by declines in real estate loans and commercial loans; the commercial loan decline was driven mostly by lower utilization of lines of credit. • Deposits decreased by $6.6 million from the second quarter of 2024. The second quarter balance included a large temporary deposit that was withdrawn early in the third quarter; excluding the large temporary deposit, deposits increased approximately 1% at September 30, 2024 from June 30, 2024. • The Company’s balance sheet continues to maintain a strong liquidity position, with a loan/deposit ratio of 78.8% for the third quarter of 2024. Asset Quality • Criticized loans decreased $14.7 million, or 2.4%, from the second quarter of 2024, to 3.3% of loans held for investment (LHFI), driven mostly by charge-offs. • Non-performing loans of $174.5 million increased 3.7% from the second quarter of 2024, reflecting 0.97% of LHFI, driven by non- accrual loan inflows slightly exceeding payoffs and charge-off outflows. Non-performing assets of $178.9 million increased 2.3% from the second quarter of 2024, reflecting the increase in non-performing loans. • Net charge-offs (NCOs) were $27.4 million, or an annualized 60 basis points of average loans outstanding during the third quarter of 2024, driven by two charge-offs totaling $22.1 million on loans from the metro-office portfolio. Excluding these two charge- offs,NCOs were 12 basis points of average loans outstanding. • Total provision for credit losses was $19.8 million; funded allowance for credit losses coverage of 1.25% of LHFI during the third quarter of 2024 compared to 1.28% from the second quarter of 2024. Capital • Quarterly cash dividend of $0.47 per share, for an annualized yield of 6.3% for the third quarter of 2024. • CET14 of 11.83% and total RBC4 of 14.11% for the third quarter of 2024. • Regulatory capital ratios improved during the quarter; CET1 improved 30 basis points. THIRD QUARTER 2024 HIGHLIGHTS 4 1 See non-GAAP table in appendix for reconciliation 2 The ratio of bank non-interest expense to revenue (per FDIC definition) 3 Metro-office defined as General Office non-owner occupied or construction real estate properties located in Portland, Seattle, Denver, Phoenix, Minneapolis/St. Paul, and Kansas City. 4 Preliminary estimates - may be subject to change

Loan Highlights: • Loans decreased $207.9 million during the third quarter of 2024 driven by declines in real estate loans and commercial loans; the commercial loan decline was driven mostly by lower utilization of lines of credit. • Commercial real estate loans increased due to inflows from completed construction projects; excluding completed construction projects, commercial real estate loans declined as paydowns exceeded new loan originations. • Commercial real estate balances are 33.2% owner-occupied as-of the third quarter of 2024. DIVERSIFIED LOAN PORTFOLIO Loans Held for Investment Commercial RE, 51% Construction RE, 7% Residential RE, 13% Agriculture RE, 4% Consumer, 5%Commercial, 16% Agriculture, 4% Loans by Geography MT, 19% WY, 6% ID, 7% WA, 9% OR, 10%NE, 7% SD, 12% ND, 2% IA, 10% KS, 2% AZ, 6% CO, 8% Other, 2% Revolving Commitments ($B) $3.1 $3.0 $2.9 $2.7 $2.7 36.8% 38.5% 38.6% 41.3% 40.4% Unfunded Funded 3Q23 4Q23 1Q24 2Q24 3Q24 5 $18.0B Balances as of September 30, 2024

COMMERCIAL REAL ESTATE AND CONSTRUCTION PORTFOLIOS Property Type Multifamily, 24% Medical, 12% Retail, 20% Industrial/Warehouse, 18% Office, 10%Hotel, 9% Land & Development, 3% Other CRE, 2% Residential 1-4 Family, 2% Market Type Metro, 5% Mid-Metro, 8% Non-Metro, 87% 6 Highlights: • $10.5 billion portfolio (58% of total loans), well diversified by property type and geography • Non-owner-occupied portfolio of $6.2 billion (34% of total loans) • $45 million of non-accrual loans (0.43% of commercial real estate and construction portfolios) • Montana has the largest state concentration representing 17% of portfolio Balances as of September 30, 2024 Highlights: • Metro defined as property located in Portland, Seattle, Denver, Phoenix, Minneapolis / St. Paul, and Kansas City. • Mid-metro defined as Omaha, Des Moines, Tuscon, and Boise. • Non-metro defined as all other areas.

METRO OFFICE 7 Balances as of September 30, 2024 Metro Office Properties > $5 million Balance Notes $20.8 Adequate debt service coverage with long-term tenants. 12.6 Recently completed construction with leases commencing. 8.5 Adequate debt service coverage. 7.8 Balance reflective of estimated realizable value. $49.7 Highlights: • Metro office defined as non-owner occupied or construction real estate general office properties located in Portland, Seattle, Denver, Phoenix, Minneapolis / St. Paul, and Kansas City • Remaining balance of $87.3 million following third quarter activity, reflective of 0.48% of loans • Remaining portfolio is granular, with only 2 loans over $10.0 million, detailed below • Largest three loans are pass rated

Deposits by State MT, 25% WY, 12% ID, 7% WA, 4% OR, 12%SD, 15% NE, 8% IA, 9% MO, 1% AZ, 3% CO, 4% Mix of Consumer and Business Deposits 53% 53% 54% 52% 52% 47% 47% 46% 48% 48% Total Consumer Deposits Total Business Deposits 3Q23 4Q23 1Q24 2Q24 3Q24 8 Average Deposit Balances 27% 27% 27% 27% 27% 33% 33% 34% 34% 34% 13% 14% 13% 13% 13% 27% 26% 26% 26% 26% 1.15% 1.36% 1.39% 1.42% 1.47% Demand Savings Time Non-interest bearing Total Cost of Deposits 3Q23 4Q23 1Q24 2Q24 3Q24 DIVERSE DEPOSIT BASE: BY TYPE OF ACCOUNT Balances as of September 30, 2024 Deposit Highlights: • Total deposits decreased $6.6 million from the second quarter of 2024. Second quarter balance included a large temporary deposit, which was withdrawn early in the quarter; deposits increased approximately 1% excluding the large temporary deposit. • Non-interest bearing deposits remained stable at 26% of total average deposits.

Total Risk-Based Capital Ratios 13.19% 13.28% 13.64% 13.80% 14.11% 11.02% 11.08% 11.37% 11.53% 11.83% 2.17% 2.20% 2.27% 2.27% 2.28% CET1 Total RBC 3Q23 4Q23 1Q24 2Q24 3Q24² CAPITAL AND LIQUIDITY Liquid and flexible balance sheet with strong capital position Common Equity (CE) and Tangible Common Equity (TCE)¹ $29.38 $31.05 $30.69 $30.85 $32.20 $17.82 $19.41 $19.16 $19.34 $20.73 6.38% 6.85% 6.92% 6.95% 7.63% 10.10% 10.52% 10.65% 10.65% 11.37% TBVPS BVPS TCE Ratio CE Ratio 3Q23 4Q23 1Q24 2Q24 3Q24 9 LHFI to Deposit Ratio 76.9% 78.4% 79.8% 79.7% 78.8% 3Q23 4Q23 1Q24 2Q24 3Q24 1 See Non-GAAP table in appendix for reconciliation 2 Preliminary estimates - may be subject to change Capital and Liquidity Highlights: • Annualized dividend yield of 6.3% based on an average share price of $29.85 for the third quarter of 2024. • Capital ratios increased for the seventh consecutive quarter. • Tangible book value per share (TBVPS)1 increased during the third quarter, driven by retained earnings and a decline in the accumulated other comprehensive income (AOCI) position of $130.6 million. For the third quarter of 2024, the AOCI mark is equal to $2.44 of book value per share (BVPS).

ALLOWANCE FOR CREDIT LOSSES (ACL) ACL ($MM) and Funded ACL/LHFI Ratio $245.5 $246.1 $243.1 $238.6 $231.0 $226.7 $227.7 $227.7 $232.8 $225.4 $18.8 $18.4 $15.4 $5.8 $5.6 1.24% 1.25% 1.25% 1.28% 1.25% Funded ACL Unfunded ACL Funded ACL % of LHFI 3Q23 4Q23 1Q24 2Q24 3Q24 10 ACL Roll-forward ($MM) Funded Unfunded Investments Total ACL 6/30/24 $232.8 $5.8 $0.7 $239.3 ACL Provision (Reversal) 20.0 (0.2) — 19.8 Net Charge-offs 27.4 — — 27.4 ACL 9/30/24 $225.4 $5.6 $0.7 $231.7 * Line items may not sum due to rounding ACL Highlights: • Funded ACL decreased slightly to 1.25% of loans from 1.28%, supported by loan portfolio characteristics and mix. • Charge-offs were driven by the charge-off of two metro-office loans; excluding these loans, net charge-offs totaled 12 basis points.

Asset Quality Highlights: • Total criticized loans decreased $14.7 million during the third quarter of 2024, driven mostly by charge-offs. • Total non-performing loans (NPLs) increased by $6.3 million, or 3.7% during the third quarter of 2024. • Net charge-offs totaled $27.4 million, or 60 basis points of average loans, during the third quarter of 2024; driven by $22.1 million from two metro office properties; net charge-offs of 12 basis points of average loans excluding these properties. ASSET QUALITY AND RESERVE TRENDS Net Charge-offs ($MM) and Net Charge-Offs Ratio $1.1 $4.8 $8.4 $13.5 $27.4 0.02% 0.10% 0.18% 0.30% 0.60% Net Charge-offs % of Average Loans 3Q23 4Q23 1Q24 2Q24 3Q24 Credit management resulted in stable asset quality Total non-performing loans ($MM) and ACL/NPL Ratios $84.6 $111.3 $175.0 $168.2 $174.5 268.0% 204.6% 130.1% 138.4% 129.2% NPLs ACL / NPL Ratio 3Q23 4Q23 1Q24 2Q24 3Q24 Total Criticized Loans ($MM) and Criticized Loan Ratio $632.9 $688.3 $630.0 $618.0 $603.3 3.5% 3.8% 3.5% 3.4% 3.3% Criticized Loans % of Total Loans 3Q23 4Q23 1Q24 2Q24 3Q24 11

Net Interest Income (NII) and Net Interest Margin (NIM) Highlights: • $4.4 million of loan purchase accounting accretion (PAA) for the third quarter of 2024, a decrease from $5.1 million from the prior quarter. • Total remaining PAA of $53.3 million as-of the third quarter of 2024 ◦ Scheduled accretion of $3.9 million, $12.8 million, $9.0 million for the remainder of FY24, FY25, FY26. • During the third quarter of 2024, FTE NIM1 increased by 4 basis points; the contribution from PAA decreased 1 basis point compared with the prior quarter. • Adjusted FTE NIM1 (which excludes the impact from PAA) increased by 5 basis points during the third quarter of 2024, primarily driven by an increase in earning asset yield outpacing funding costs. NET INTEREST INCOME FTE NII¹ ($MM) and FTE NIM¹ $210.2 $204.1 $195.3 $198.3 $202.7 $5.2 $5.4 $6.5 $5.1 $4.4 $215.4² $209.5² $201.8² $203.4² $207.1² 3.07% 3.01% 2.93% 3.00% 3.04% 3.00% 2.94% 2.84% 2.92% 2.97% Adjusted FTE NII¹ Loan PAA FTE NIM¹ Adjusted FTE NIM¹ 3Q23 4Q23 1Q24 2Q24 3Q24 12 1 See Non-GAAP table in appendix for reconciliation 2 FTE NII

INVESTMENT PORTFOLIO 13 Total Portfolio Duration at Quarter-end 3.7 3.5 3.6 3.5 3.4 3Q23 4Q23 1Q24 2Q24 3Q24 (in years) Projected Cash Flow ($MM) and Yield Roll-Off at Quarter-end* $214.4 $179.8 $214.3 $352.7 $213.4 $211.4 2.49% 2.36% 2.38% 2.75% 2.44% 2.39% 4Q24E 1Q25E 2Q25E 3Q25E 4Q25E 1Q26E *Constitute forward-looking statements

14 3Q24 Non-interest Income by Type Payment Services, 40% Mortgage Banking, 4% Wealth Management, 21% Deposit Service Charges, 14% Other Service Charges & Fees, 5% Other Income, 16% Dollars in millions 3Q23 2Q24 3Q24 Payment services revenues $ 19.2 $ 18.6 $ 18.7 Mortgage banking revenues 2.0 1.7 1.7 Wealth management revenues 8.7 9.4 9.6 Service charges on deposit accounts 6.0 6.4 6.6 Other service charges, commissions and fees 2.2 2.1 2.2 Investment securities losses, net — — — Other income 3.9 4.4 7.6 Total Reported Non-interest Revenue $ 42.0 $ 42.6 $ 46.4 % of Total Revenue 16.4 % 17.4 % 18.4 % NON-INTEREST INCOME Non-interest Income Notes: • Q3 2024 results included $2.6 million for a gain-on-sale of one of our branches.

NON-INTEREST EXPENSE 15 Dollars in millions 3Q23 2Q24 3Q24 Salaries and wages $ 65.4 $ 66.3 $ 70.9 Employee benefits 19.7 16.9 19.7 Occupancy and equipment 17.0 16.9 17.0 Other intangible amortization 3.9 3.7 3.6 Other expenses 54.6 51.1 48.2 Other real estate owned expense 0.5 2.0 — Total Reported Non-interest Expense $ 161.1 $ 156.9 $ 159.4 Non-interest Expense ($MM) and Efficiency Ratio 161.1 166.0 160.2 156.9 159.4 61.5% 64.2% 64.6% 62.7% 61.8% Total Non-interest Expenses Efficiency Ratio ¹ 3Q23 4Q23 1Q24 2Q24 3Q24 1 The ratio of the bank’s non-interest expense to revenue (per FDIC definition) Non-interest Expense Notes: • Q1 2024 results include a $1.5 million accrual for a FDIC special assessment • Q3 2024 results included $3.8 million for CEO transition related expenses

Loans and Deposits • Anticipate ending deposits to be relatively flat through year-end 2024 from September 30 balances • Anticipate ending loans to range from relatively flat to modestly lower through year-end 2024 from September 30 balances Net Interest Income • Anticipate fourth quarter net interest income to increase 1-2% over third quarter, with Net Interest Margin increasing at or modestly more than the third quarter increase over the second quarter • Outlook assumes two 25 basis point rate decreases in fourth quarter; rate decreases have minimal impact on 4Q outlook Non-Interest Income • Anticipate fourth quarter non-interest income to be approximately flat from the third quarter, excluding the $2.6 million branch sale gain in the third quarter Non-Interest Expense • Anticipate fourth quarter non-interest expense to increase 2-3% over the third quarter excluding the $3.8 million of CEO transition related expenses in the third quarter Tax Rate • Anticipate effective tax rate to be 23.5%-24.0% for full-year 2024 Credit Quality • Anticipate net charge-offs between 20 and 25 basis points for the fourth quarter, excluding any impact from the previously disclosed non-performing C&I loan with specific reserve allocated 2024 GUIDANCE SUMMARY* 16 *Preliminary estimates - may be subject to change *Constititute forward-looking statements

NON-GAAP FINANCIAL MEASURES 17 In addition to results presented in accordance with accounting principles generally accepted in the United States of America, or GAAP, this presentation contains the following non-GAAP financial measures that management uses to evaluate our performance relative to our capital adequacy standards: (i) tangible common stockholders’ equity; (ii) tangible assets; (iii) tangible book value per common share; (iv) tangible common stockholders’ equity to tangible assets;(v) net interest income on a fully taxable equivalent basis; (vi) adjusted net interest income on a fully taxable equivalent basis; (vii) net interest margin on a fully taxable equivalent basis; and (viii) adjusted net interest margin on a fully taxable equivalent basis. Tangible common stockholders’ equity is calculated as total common stockholders’ equity less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible assets are calculated as total assets less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible book value per common share is calculated as tangible common stockholders’ equity divided by common shares outstanding. Tangible common stockholders’ equity to tangible assets is calculated as tangible common stockholders’ equity divided by tangible assets. Net interest income on a fully taxable equivalent basis is calculated as net interest income, adjusted to include its fully taxable equivalent interest income. Adjusted net interest income on a fully taxable equivalent basis is calculated as net interest income on a fully taxable equivalent basis less purchase accounting interest accretion on acquired loans. Net interest margin on a fully taxable equivalent basis is calculated as annualized net interest income on a fully taxable equivalent basis divided by average interest-earning assets. Adjusted net interest margin on a fully taxable equivalent basis is calculated as annualized adjusted net interest income on a fully taxable equivalent basis divided by average interest-earning assets. These non-GAAP financial measures are calculated on the reconciliation pages that follow). These non-GAAP financial measures may not be comparable to similarly titled measures reported by other companies because other companies may not calculate these non-GAAP measures in the same manner. They also should not be considered in isolation or as a substitute for measures prepared in accordance with GAAP. The Company adjusts the most directly comparable capital adequacy GAAP financial measures to the non-GAAP financial measures described in subclauses (i) through (iv) above to exclude goodwill and other intangible assets (except mortgage servicing rights), adjusts its GAAP net interest income to include fully taxable equivalent adjustments and further adjusts its net interest income on a fully taxable equivalent basis to exclude purchase accounting interest accretion. Management believes these non-GAAP financial measures, which are intended to complement the capital ratios defined by banking regulators and are intended to present on a consistent basis our and our acquired companies’ organic continuing operations without regard to the acquisition costs and adjustments that we consider to be unpredictable and dependent on a significant number of factors that are outside our control, are useful to investors in evaluating the Company’s performance because, as a general matter, they either do not represent an actual cash expense and are inconsistent in amount and frequency depending upon the timing and size of our acquisitions (including the size, complexity and/or volume of past acquisitions, which may drive the magnitude of acquisition related costs, but may not be indicative of the size, complexity and/or volume of future acquisitions or related costs), or they cannot be anticipated or estimated in a particular period (in particular as it relates to unexpected recovery amounts). This impacts the ratios that are important to analysts and allows investors to compare certain aspects of the Company’s capitalization to other companies. See the Non-GAAP Financial Measures tables included below and the textual discussion for a reconciliation of the above described non-GAAP financial measures to their most directly comparable GAAP financial measures.

3Q23 4Q23 1Q24 2Q24 3Q24 (Dollars in millions) Total common stockholders' equity (GAAP) (A) $ 3,085.5 $ 3,227.5 $ 3,209.7 $ 3,225.3 $ 3,365.8 Less goodwill and other intangible assets (excluding mortgage servicing rights) 1,214.1 1,210.3 1,206.6 1,202.9 1,199.3 Tangible common stockholders' equity (Non-GAAP) (B) $ 1,871.4 $ 2,017.2 $ 2,003.1 $ 2,022.4 $ 2,166.5 Total assets (GAAP) $ 30,540.8 $ 30,671.2 $ 30,144.8 $ 30,289.5 $ 29,595.5 Less goodwill and other intangible assets (excluding mortgage servicing rights) 1,214.1 1,210.3 1,206.6 1,202.9 1,199.3 Tangible assets (Non-GAAP) (C) $ 29,326.7 $ 29,460.9 $ 28,938.2 $ 29,086.6 $ 28,396.2 Common shares outstanding (L) 105,011 103,942 104,572 104,561 104,530 Book value per common share (GAAP) (A) / (L) $ 29.38 $ 31.05 $ 30.69 $ 30.85 $ 32.20 Tangible book value per common share (Non-GAAP) (B) / (L) 17.82 19.41 19.16 19.34 20.73 Tangible common stockholders' equity to tangible assets (Non-GAAP) (B) / (C) 6.38 % 6.85 % 6.92 % 6.95 % 7.63 % NON-GAAP RECONCILIATION 18 * Line items may not sum due to rounding

3Q23 4Q23 1Q24 2Q24 3Q24 (Dollars in millions) Net interest income (A) $ 213.7 $ 207.8 $ 200.1 $ 201.7 $ 205.5 FTE adjustments(1) 1.7 1.7 1.7 1.7 1.6 Net interest income on a FTE basis (Non-GAAP) (B) 215.4 209.5 201.8 203.4 207.1 Less purchase accounting accretion 5.2 5.4 6.5 5.1 4.4 Adjusted net interest income on a FTE basis (Non-GAAP) (C) $ 210.2 $ 204.1 $ 195.3 $ 198.3 $ 202.7 Average interest-earning assets (D) $ 27,796.8 $ 27,569.4 $ 27,699.6 $ 27,286.9 $ 27,133.3 Net interest margin (A annualized)/(D) 3.05 % 2.99 % 2.91 % 2.97 % 3.01 % Net interest margin (FTE) (Non-GAAP) (B annualized)/(D) 3.07 3.01 2.93 3.00 3.04 Adjusted net interest margin (FTE) (Non-GAAP) (C annualized)/(D) 3.00 2.94 2.84 2.92 2.97 NON-GAAP RECONCILIATION 19 * Line items may not sum due to rounding 1 Management believes net interest income on a FTE basis is useful to investors in evaluating the Company’s performance as a comparison of the returns between a tax-free investment and a taxable alternative. The Company adjusts its net interest income for tax exempt loans and securities to what it would have received on taxable alternatives utilizing a 21.00% tax rate.

Cover	Oct. 24, 2024
Cover [Abstract]
Document Type	8-K
Document Period End Date	Oct. 24, 2024
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM, INC.
Entity Incorporation, State or Country Code	DE
Entity File Number	001-34653
Entity Tax Identification Number	81-0331430
Entity Address, Address Line One	401 North 31st Street
Entity Address, City or Town	Billings,
Entity Address, State or Province	MT
Entity Address, Postal Zip Code	59101
City Area Code	(406)
Local Phone Number	255-5311
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common stock, $0.00001 par value
Trading Symbol	FIBK
Security Exchange Name	NASDAQ
Amendment Flag	false
Entity Central Index Key	0000860413
Entity Emerging Growth Company	false

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