10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

___________________________________________________________________________________________________________________________________________________ 

FORM 10-Q

_____________________________________________________________________________________________________________________________________________________ 

☒    Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2022

OR

 ☐    Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from                   to                   

COMMISSION FILE NUMBER 001-34653

________________________________________________________________________________________________________ 

FIRST INTERSTATE BANCSYSTEM, INC.

(Exact name of registrant as specified in its charter)

________________________________________________________________________________________________________ 

Montana		81-0331430
(State or other jurisdiction of incorporation or organization)		(IRS Employer Identification No.)
401 North 31st Street
Billings,	MT	59116-0918
(Address of principal executive offices)		(Zip Code)

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

_________________________________________________________________________________________________ 

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A common stock, no par value	FIBK	NASDAQ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files.)     Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		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. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  ☐ No  ☒

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date:

April 30, 2022 – Class A common stock 109,493,618 

Quarterly Report on Form 10-Q

	FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES
	Index
	March 31, 2022
		Page Nos.
	Part I - Financial Information
Item 1.	Financial Statements (Unaudited)
	Consolidated Balance Sheets	3
	Consolidated Statements of (Loss) Income	4
	Consolidated Statements of Comprehensive (Loss) Income	5
	Consolidated Statements of Changes in Stockholders’ Equity	6
	Consolidated Statements of Cash Flows	7
	Notes to Unaudited Consolidated Financial Statements	9
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	46
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	61
Item 4.	Controls and Procedures	61
	Part II - Other Information
Item 1.	Legal Proceedings	61
Item 1A.	Risk Factors	61
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	62
Item 3.	Defaults Upon Senior Securities	62
Item 4.	Mine Safety Disclosures	62
Item 5.	Other Information	62
Item 6.	Exhibits	63
Signatures		64

2

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In millions, except share data)

(Unaudited)

	March 31, 2022		December 31, 2021
Assets
Cash and due from banks	$	387.6	$	168.6
Interest bearing deposits in banks	3,423.6		2,176.1
Federal funds sold	0.1		0.1
Total cash and cash equivalents	3,811.3		2,344.8
Securities purchased under agreement to resell	102.0		—
Investment securities:
Available-for-sale, at estimated fair value	6,283.8		4,820.5
Held-to-maturity, net of allowance for credit losses of $1.6 and $0 at March 31, 2022 and December 31, 2021 (estimated fair values of $3,029.1 and $1,667.5 at March 31, 2022 and December 31, 2021)	3,218.7		1,687.6
Total investment securities	9,502.5		6,508.1
Loans held for sale	178.1		30.1
Loans held for investment, net of deferred fees and costs	16,945.0		9,331.7
Allowance for credit losses	247.2		122.3
Net loans held for investment	16,697.8		9,209.4
Goodwill	1,137.6		621.6
Company-owned life insurance	490.1		301.5
Premises and equipment, net of accumulated depreciation	444.4		299.6
Other intangibles, net of accumulated amortization	109.6		41.3
Accrued interest receivable	81.1		47.4
Mortgage servicing rights, net of accumulated amortization and impairment reserve	32.7		28.2
Other real estate owned	17.5		2.0
Deferred tax asset, net	137.4		—
Other assets	420.1		237.9
Total assets	$	33,162.2	$	19,671.9
Liabilities and Stockholders’ Equity
Deposits:
Non-interest bearing	$	8,240.6	$	5,568.3
Interest bearing	19,847.7		10,701.3
Total deposits	28,088.3		16,269.6
Securities sold under repurchase agreements	1,071.0		1,051.1
Accounts payable and accrued expenses	266.1		148.4
Accrued interest payable	6.0		3.7
Deferred tax liability, net	—		9.3
Long-term debt	120.4		112.4
Allowance for credit losses on off-balance sheet credit exposures	6.2		3.8
Subordinated debentures held by subsidiary trusts	163.1		87.0
Total liabilities	29,721.1		17,685.3
Stockholders’ equity:
Preferred stock, no par value; 100,000,000 shares authorized; none issued and outstanding	—		—
Common stock, no par value; 150,000,000 and 100,000,000 shares authorized at March 31, 2022 and December 31, 2021; 109,503,010 shares and 62,200,456 shares issued and outstanding, respectively	2,668.6		945.0
Retained earnings	974.5		1,052.6
Accumulated other comprehensive loss, net	(202.0)		(11.0)
Total stockholders’ equity	3,441.1		1,986.6
Total liabilities and stockholders’ equity	$	33,162.2	$	19,671.9

See accompanying notes to unaudited consolidated financial statements.

3

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF (LOSS) INCOME

(In millions, except per share data)

(Unaudited)

	Three Months Ended March 31,
	2022		2021
Interest income:
Interest and fees on loans	$	151.7	$	107.8
Interest and dividends on investment securities:
Taxable	29.3		15.8
Exempt from federal taxes	1.3		1.4
Interest on deposits in banks	1.7		0.3
Total interest income	184.0		125.3
Interest expense:
Interest on deposits	3.0		2.3
Interest on securities sold under repurchase agreements	0.3		0.1
Interest on long-term debt	1.7		1.5
Interest on subordinated debentures held by subsidiary trusts	1.0		0.7
Total interest expense	6.0		4.6
Net interest income	178.0		120.7
Provision for (reversal of) credit losses	61.3		(5.1)
Net interest income after provision for (reversal of) credit losses	116.7		125.8
Non-interest income:
Payment services revenues	14.8		10.2
Mortgage banking revenues	8.4		11.6
Wealth management revenues	8.1		6.3
Service charges on deposit accounts	7.7		3.8
Other service charges, commissions, and fees	4.3		2.1
Investment securities losses, net	(0.1)		—
Other income	6.0		4.1
Total non-interest income	49.2		38.1
Non-interest expense:
Salaries and wages	60.0		39.0
Employee benefits	21.2		16.1
Outsourced technology services	11.3		8.1
Occupancy, net	10.0		7.3
Furniture and equipment	5.4		4.4
OREO expense, net of income	0.1		(0.1)
Professional fees	3.9		3.4
FDIC insurance premiums	3.3		1.6
Other intangibles amortization	3.6		2.5
Other expenses	23.2		16.1
Acquisition related expenses	65.2		—
Total non-interest expense	207.2		98.4
(Loss) income before income tax	(41.3)		65.5
(Benefit from) provision for income tax	(7.9)		14.1
Net (loss) income	$	(33.4)	$	51.4
(Loss) earnings per common share (Basic)	$	(0.36)	$	0.83
(Loss) earnings per common share (Diluted)	(0.36)		0.83
Weighted average common shares outstanding (Basic)	92,855,173		61,591,877
Weighted average common shares outstanding (Diluted)	92,855,173		61,714,063

See accompanying notes to unaudited consolidated financial statements.

4

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME

(In millions)

(Unaudited)

	Three Months Ended March 31,
	2022		2021
Net (loss) income	$	(33.4)	$	51.4
Other comprehensive (loss) income, before tax:
Investment securities available-for sale:
Change in net unrealized loss during period	(252.6)		(66.8)
Reclassification adjustment for net loss included in income	0.1		—
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	0.2		—
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity	(23.0)		—
Change in unrealized loss (gain) on derivatives	21.3		(0.1)
Other comprehensive loss, before tax	(254.0)		(66.9)
Changes in deferred taxes related to other comprehensive loss	63.0		17.0
Other comprehensive loss, net of tax	(191.0)		(49.9)
Comprehensive (loss) income, net of tax	$	(224.4)	$	1.5

See accompanying notes to unaudited consolidated financial statements.

5

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY (In millions, except share and per share data) (Unaudited)
	Three Months Ended March 31,
	Common stock		Retained earnings		Accumulated other comprehensive income (loss)		Total stockholders’ equity
Balance at December 31, 2021	$	945.0	$	1,052.6	$	(11.0)	$	1,986.6
Net loss	—		(33.4)		—		(33.4)
Other comprehensive loss, net of tax expense	—		—		(191.0)		(191.0)
Common stock transactions:
37,698 common shares purchased and retired	(1.4)		—		—		(1.4)
46,887,104 common shares issued	1,722.5		—		—		1,722.5
450,813 non-vested common shares issued	—		—		—		—
15,472 non-vested common shares forfeited or canceled	—		—		—		—
17,807 stock options exercised, net of 4,877 shares tendered in payment of option price and income tax withholding amounts	0.1		—		—		0.1
Stock-based compensation expense	2.4		—		—		2.4
Common stock cash dividends declared ($0.41 per share)	—		(44.7)		—		(44.7)
Balance at March 31, 2022	$	2,668.6	$	974.5	$	(202.0)	$	3,441.1
	Common stock		Retained earnings		Accumulated other comprehensive income (loss)		Total stockholders’ equity
Balance at December 31, 2020	$	941.1	$	962.1	$	56.6	$	1,959.8
Net income	—		51.4		—		51.4
Other comprehensive loss, net of tax expense	—		—		(49.9)		(49.9)
Common stock transactions:
127,180 common shares purchased and retired	(5.4)		—		—		(5.4)
604 common shares issued	—		—		—		—
239,525 non-vested common shares issued	—		—		—		—
19,068 non-vested common shares forfeited or canceled	—		—		—		—
40,663 stock options exercised, net of 6,177 shares tendered in payment of option price and income tax withholding amounts	0.4		—		—		0.4
Stock-based compensation expense	2.4		—		—		2.4
Common stock cash dividends declared ($0.41 per share)	—		(25.3)		—		(25.3)
Balance at March 31, 2021	$	938.5	$	988.2	$	6.7	$	1,933.4

See accompanying notes to unaudited consolidated financial statements.

6

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (In millions) (Unaudited)
	Three Months Ended March 31,
	2022		2021
Cash flows from operating activities:
Net (loss) income	$	(33.4)	$	51.4
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for (reversal of) credit losses	61.3		(5.1)
Net gain on disposal of premises and equipment	(0.2)		(0.4)
Depreciation and amortization	13.3		11.4
Net premium amortization on investment securities	8.1		7.7
Net loss on investment securities transactions	0.1		—
Realized and unrealized net gains on mortgage banking activities	(3.3)		(3.9)
Net gain on sale of OREO	—		(0.1)
Net gain on extinguishment of debt	(1.4)		—
Mortgage servicing rights recovery	(3.4)		(5.9)
Deferred taxes	(6.5)		9.6
Net increase in cash surrender value of company-owned life insurance	(2.0)		(1.2)
Stock-based compensation expense	2.4		2.4
Originations of mortgage loans held for sale	(98.8)		(156.4)
Proceeds from sales of mortgage loans held for sale	112.0		177.2
Changes in operating assets and liabilities:
(Increase) decrease in interest receivable	(0.6)		1.1
Decrease (increase) in other assets	4.3		(7.8)
(Decrease) increase in accrued interest payable	(0.1)		1.1
Increase (decrease) in accounts payable and accrued expenses	13.1		(10.6)
Net cash provided by operating activities	64.9		70.5
Cash flows from investing activities:
Purchases of investment securities:
Held-to-maturity	(370.0)		(825.1)
Available-for-sale	(1,144.5)		(378.6)
Proceeds from sales, maturities, and pay-downs of investment securities:
Held-to-maturity	106.4		9.3
Available-for-sale	826.5		293.7
Extensions of credit to clients, net of repayments	106.4		(58.7)
Proceeds from sale of OREO	0.3		0.7
Acquisition of bank and bank holding company, net of cash and cash equivalents received	2,006.9		—
Capital expenditures, net of sales	(9.5)		(0.5)
Net cash provided by (used in) investing activities	$	1,522.5	$	(959.2)

7

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (continued) (In millions) (Unaudited)
	Three Months Ended March 31,
	2022		2021
Cash flows from financing activities:
Net increase in deposits	$	130.8	$	877.0
Net decrease in securities sold under repurchase agreements	(55.0)		(38.8)
Repayments of long-term debt	(157.9)		—
Advances on long-term debt	8.0		—
Payment of stock issuance costs	(0.8)		—
Proceeds from issuance of common stock, net	0.1		0.4
Purchase and retirement of common stock	(1.4)		(5.4)
Dividends paid to common stockholders	(44.7)		(25.3)
Net cash (used in) provided by financing activities	(120.9)		807.9
Net increase (decrease) in cash and cash equivalents	1,466.5		(80.8)
Cash and cash equivalents at beginning of period	2,344.8		2,276.8
Cash and cash equivalents at end of period	$	3,811.3	$	2,196.0
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	$	0.1	$	21.0
Cash paid during the period for interest expense	6.0		3.5
Supplemental disclosures of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	$	19.9	$	—
Transfer of held-to-maturity to available-for sale securities	10.9		—
Transfer of available-for sale to held-to-maturity securities	463.6		—
Transfer of held-for-sale to held for investment loans	19.8		—
Transfer of loans to other real estate owned	—		0.3
Shares issued for acquisition	1,723.3		—
Capitalization of internally originated mortgage servicing rights	1.1		0.1
Supplemental schedule of noncash investing activities from acquisition:
Investment securities	$	2,699.0	$	—
Securities purchased under agreement to resell	101.1		—
Loans held for sale	181.9		—
Loans held for investment, net	7,629.1		—
Premises and equipment	144.1		—
Goodwill	516.0		—
Other intangibles	71.9		—
Mortgage servicing rights	1.3		—
Company-owned life insurance	186.6		—
Deferred tax assets	76.1		—
Other real estate owned	15.8		—
Other assets	198.0		—
Total noncash assets acquired	11,820.9		—
Liabilities assumed:
Deposits	$	11,688.0	$	—
Securities sold under repurchase agreements	74.0		—
Accounts payable and accrued expenses	107.1		—
Long-term debt	159.3		—
Subordinated debentures held by subsidiary trusts	76.1		—
Total liabilities assumed	$	12,104.5	$	—

See accompanying notes to unaudited consolidated financial statements.

8

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(1)    Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc., First Interstate Bank (“FIB”), and its other subsidiaries (collectively, the “Company”) contain all adjustments (all of which are of a normal recurring nature) necessary to present fairly the financial position of the Company at March 31, 2022 and December 31, 2021, the results of operations, changes in stockholders’ equity, and cash flows for each of the three month periods ended March 31, 2022 and 2021, in conformity with U.S. generally accepted accounting principles (“GAAP”). The balance sheet information at December 31, 2021 is derived from the audited consolidated financial statements. Certain reclassifications, none of which were material, have been made to conform the Company’s prior year financial statements to the March 31, 2022 presentation. These reclassifications did not change previously reported net income or stockholders’ equity.

These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, which includes a description of significant accounting policies. Operating results for the three months ended March 31, 2022 are not necessarily indicative of the results that may be expected for the year ending December 31, 2022.

9

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(2)    Acquisition

Great Western Bank. On September 15, 2021, the Company entered into a definitive agreement (“Agreement”) to acquire 100% of the outstanding stock of Great Western Bancorp, Inc. (“Great Western”), the parent company of Great Western Bank (“GWB”), a Sioux Falls, South Dakota based community bank with 174 banking offices across Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota. The acquisition of GWB expanded the Company’s geographical footprint with an enhanced platform for future growth. The acquisition was completed on February 1, 2022.

Consideration for the acquisition was $1,723.3 million, consisting of the issuance of 46.9 million shares of the Company’s Class A common stock valued at $36.76 per share, which was the opening price of the Company’s Class A common stock as quoted on the NASDAQ stock market on the acquisition date. Holders of shares of Great Western common stock received 0.8425 shares of First Interstate Class A common stock for each whole share of Great Western common stock and received cash in lieu of fractional shares. Previously unvested Great Western restricted stock awards that were outstanding immediately prior to the close of the transaction became vested and were considered issued and outstanding at acquisition close and included in consideration.

The Company accounted for this transaction under the acquisition method of accounting in accordance with ASC 805, Business Combinations, which requires purchased assets and liabilities assumed and consideration exchanged to be recorded at their respective estimated fair values at the date of acquisition. The determination of estimated fair values required management to make certain estimates about discount rates, future expected cash flows, and market conditions at the time of the acquisition, as well as other future events that are highly subjective in nature. This determination is subject to refinement for up to one year after the closing date of the acquisition as additional information relative to the closing date fair values becomes available and such information is considered final, whichever is earlier.

The following table provides the provisional purchase price allocation as of the acquisition date and the Great Western assets acquired and liabilities assumed at their estimated fair value as of the acquisition date. We recorded the estimate of fair value based on initial valuations available at the acquisition date. The excess value of the consideration paid over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation resulted in provisional goodwill of $516.0 million, which is not deductible for income tax purposes. Goodwill resulting from the acquisition was allocated to the Company’s one operating segment, community banking, and consists largely of the synergies and economies of scale expected from combining the operations of Great Western and the Company. Due to the recent closing of the transaction, all amounts reported are provisional pending the review of valuations obtained from third parties.

10

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

As of February 1, 2022
Assets acquired:
Cash and cash equivalents	$	2,006.9
Investment securities	2,699.0
Securities purchased under agreement to resell	101.1
Loans held for sale	181.9
Loans held for investment	7,713.4
Allowance for credit losses	(84.3)
Premises and equipment, including right of use lease assets	144.1
Other real estate owned (“OREO”)	15.8
Company owned life insurance	186.6
Core deposit intangibles	49.1
Customer relationship intangible	22.8
Mortgage servicing rights	1.3
Deferred tax assets, net	76.1
Other assets	198.0
Total assets acquired	13,311.8
Liabilities assumed:
Deposits	11,688.0
Securities sold under repurchase agreements	74.0
Accrued expenses and other liabilities	107.1
FHLB advances	122.9
Subordinated debt	36.4
Subordinated debentures held by subsidiary trusts	76.1
Total liabilities assumed	12,104.5
Net assets acquired	$	1,207.3
Consideration paid:
Class A common stock	1,723.3
Total consideration paid (1)	$	1,723.3
Goodwill	$	516.0

(1) Includes $13 thousand of cash paid in lieu of fractional shares.

The Company determined the fair value of loans, core deposit and customer relationship intangible assets, investment securities, premises and equipment, leases, mortgage servicing rights, deposits, FHLB advances, subordinated debt, and subordinated debentures held by subsidiary trusts with the assistance of third-party valuation specialists. The following is a description of the methods used to determine the fair values of significant assets and liabilities presented above.

Cash and cash equivalents

The carrying amount of these assets is a reasonable estimate of fair value based on the short-term nature of these assets.

Investment Securities

Fair values for securities are based on quoted market prices, where available. If quoted market prices are not available, fair value estimates are based on observable inputs including quoted market prices for similar instruments, quoted market prices that are not in an active market or other inputs that are observable in the market. In the absence of observable inputs, fair value is estimated based on pricing models and/or discounted cash flow methodologies.

Loans held for sale

The loans held for sale portfolio was recorded at fair value at the date of acquisition based on quotes or bids from third party investors.

11

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Loans held for investment

The loans held for investment portfolio was recorded at fair value at the date of acquisition. A valuation of the loans held for investment portfolio was performed by a third party as of the acquisition date in accordance with ASC 820 to assess the fair value of the loan portfolio, considering adjustments for interest rate risk, required equity return, servicing, credit, and liquidity risk. The loans held for investment portfolio was segmented into two groups including purchase credit deteriorated (PCD) loans and non-PCD loans. The non-PCD loans were pooled based on similar characteristics, such as loan type, fixed or adjustable interest rates, payment type, index rate and caps/floors, and non-accrual status. The PCD loans were valued at the loan level with similar characteristics noted above. The fair value was calculated using a discounted cash flow analysis. The discount rate utilized to analyze fair value considered the cost of funds rate, capital charge, servicing costs, and liquidity premium, mostly based on industry standards.

The Company is required to record PCD assets, defined as a more-than-insignificant deterioration in credit quality since origination or issuance, at the purchase price plus the allowance for credit losses expected at the time of acquisition. Under this method, there is no credit loss expense affecting net income on acquisition of PCD assets. Changes in estimates of expected credit losses after acquisition are recognized in subsequent periods as credit loss expense (or reversal of credit loss expense) arise. Any non-credit discount or premium resulting from acquiring a pool of purchased financial assets with credit deterioration is allocated to each individual asset. At the acquisition date, the initial allowance for credit losses determined on a collective basis is allocated to individual assets to appropriately allocate any non-credit discount or premium. The non-credit discount or premium, after the adjustment for the allowance for credit losses, is accreted to interest income using the interest method based on the effective interest rate determined after the adjustment for credit losses at the adoption date. Information regarding loans acquired at the acquisition date is as follows:

(In millions)
PCD loans:
Unpaid principal balance	$	979.2
Principal amounts previously written off by GWB	(238.7)
Interest applied to principal by GWB	(18.1)
Adjusted unpaid principal balance	722.4
Credit discount	(90.9)
Discount attributable to other factors	(24.6)
Fair value	606.9
Allowance for credit losses	84.3
Amortized cost basis	691.2
Non-PCD loans:
Unpaid principal balance	7,107.9
Credit discount (1)	(76.5)
Non-credit discount	(9.2)
Fair value	7,022.2
Amortized cost basis	$	7,713.4
(1) Represents the best estimate of the contractual cash flows not expected to be collected as of the acquisition date.

Core deposit intangible

Core deposit intangible assets of $49.1 million on non-maturing deposits were determined by evaluating the underlying characteristics of the deposit relationships, including customer attrition, deposit interest rates and maintenance costs, and costs of alternative funding using the discounted cash flow approach. The core deposit intangibles represent the costs saved by the Company between maintaining the existing deposits and obtaining alternative funds over the life of the deposit base. These costs are amortized using an accelerated method over the estimated useful life of 10 years for the related deposits.

Premises and equipment

The fair values of premises are based on a market approach, using third-party appraisals of value for land and premises.

12

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Deposits

The fair values used for the demand and savings deposits equal the amounts payable on demand at the acquisition date. In determining the fair value of certificates of deposit, the cash flows of the contractual interest payments during the specific period of the certificates of deposit and scheduled principal payout were discounted to present value at market-based interest rates.

Customer relationship intangible

Customer relationship intangible assets of $22.8 million were determined using an excess earnings model associated with the expected fee income related to the underlying client relationships and is being amortized using the straight-line method over the estimated useful life of 12 years.

FHLB advances

The fair value of fixed rate Federal Home Loan Bank of Des Moines (“FHLB”) advances was determined using a discounted cash flow approach. The cash flows of the advances were projected based on scheduled payments of the fixed rate advances, which factored in prepayment fees. The cash flows were then discounted to present value using the FHLB rates as of February 1, 2022.

Subordinated debt and subordinated debentures held by subsidiary trusts

The fair value of subordinated debt and subordinated debentures held by subsidiary trusts was determined by using a discounted cash flow method using a market participant discount rate for similar instruments over the remaining terms.

Acquisition related expenses related to the GWB acquisition of $65.2 million for the three month period ended March 31, 2022 were included as a component of non-interest expense in the consolidated income statement, of which approximately $25.8 million are acquisition related costs as defined by ASC 805. The Company contributed $21.5 million to the First Interstate Foundation and reimbursed an aggregate of $8.2 million of the Scott family control group’s acquisition expenses pursuant to the Agreement.

The accompanying consolidated statements of loss for the three months ended March 31, 2022, include the results of operations of the acquired entity from the February 1, 2022 acquisition date. The disclosure of GWB post-acquisition revenue and net income is not practical due to the combining of certain GWB operations with and into FIB as of the acquisition date. Although legally merged with FIB, the acquired entity will continue to do business as GWB until system conversion, expected to occur in May 2022, at which point GWB’s operations will be integrated with the Company’s operations.

The following table presents certain unaudited pro forma financial information for illustrative purposes only, for the three month periods ended March 31, 2022 and 2021 as if GWB had been acquired on January 1, 2021. This unaudited pro forma information combines the historical results of GWB with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred at the beginning of the year prior to the acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value, cost savings, or business synergies. As a result, actual amounts would have differed from the unaudited pro forma information presented, and the differences could be significant.

	Three Months Ended March 31,
	2022		2021
Total revenues	$	268.9	$	321.6
Net income (loss)	$	76.4	$	(78.2)
Earnings (loss) per common share (Basic)	$	0.70	$	(0.72)
Earnings (loss) per common share (Diluted)	$	0.70	$	(0.72)

13

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(3)    Goodwill and Other Intangible Assets

Goodwill

Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances, such as upon material adverse changes in legal, business, regulatory, and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 1, 2021 and 2020 and concluded that there was no impairment to goodwill.

The following table details changes in the recorded amount of goodwill as of the dates indicated:

	March 31, 2022		December 31, 2021
Net carrying value at beginning of the period	$	621.6	$	621.6
Provisional additions to goodwill from acquisition	516.0		—
Net carrying value at end of period	$	1,137.6	$	621.6

Other Intangible Assets

Other intangible assets are comprised of core deposit intangibles (“CDI”) and other customer relationship intangibles (“OCRI”) and amounted to the following at March 31, 2022 and December 31, 2021:

	CDI		OCRI		Total
March 31, 2022
Gross other intangible assets, at beginning of the period	$	106.0	$	—	$	106.0
Provisional amounts established through acquisition	49.1		22.8		71.9
Accumulated amortization	(68.0)		(0.3)		(68.3)
Net other intangible assets, end of period	$	87.1	$	22.5	$	109.6
December 31, 2021
Gross other intangible assets, at beginning of the period	$	106.0	$	—	$	106.0
Accumulated amortization	(64.7)		—		(64.7)
Net other intangible assets, end of period	$	41.3	$	—	$	41.3

The Company recorded $3.6 million and $2.5 million of other intangible asset amortization expense for the three months ended March 31, 2022 and 2021, respectively.

CDI and OCRI are evaluated for impairment if events and circumstances indicate a possible impairment. CDI is amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is generally 10 years. OCRI is amortized using a straight-line method over its estimated useful life of 12 years based on customer revenue attrition on an annualized basis.

The following table provides the estimated aggregate future amortization expense of other intangible assets:

Years Ending December 31,	CDI		OCRI		Total
2022 remaining	$	10.9	$	1.4	$	12.3
2023	13.7		1.9		15.6
2024	12.7		1.9		14.6
2025	11.8		1.9		13.7
2026	11.0		1.9		12.9
Thereafter	27.0		13.5		40.5
Total	$	87.1	$	22.5	$	109.6

14

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(4)    Investment Securities

The amortized cost and the approximate fair values of investment securities are summarized as follows:

March 31, 2022	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-Sale:
U.S. Treasury notes	$	698.2	$	—	$	(53.3)	$	644.9
State, county, and municipal securities	320.3		0.2		(27.8)		292.7
Obligations of U.S. government agencies	144.6		—		(6.7)		137.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	3,816.4		1.1		(171.8)		3,645.7
Private mortgage-backed securities	288.4		—		(13.6)		274.8
Collateralized loan obligations	1,075.4		—		(4.5)		1,070.9
Corporate securities	231.8		0.5		(15.4)		216.9
Total	$	6,575.1	$	1.8	$	(293.1)	$	6,283.8

March 31, 2022	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held-to-Maturity:
U.S. Treasury notes	$	296.2	$	—	$	296.2	$	—	$	—	$	296.2
State, county, and municipal securities	197.3		(0.1)		197.2		0.8		(21.4)		176.6
Obligations of U.S. government agencies	340.8		—		340.8		—		(32.3)		308.5
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations (1)	2,302.0		—		2,302.0		18.2		(152.4)		2,167.8
Corporate securities	84.0		(1.5)		82.5		0.2		(2.7)		80.0
Total	$	3,220.3	$	(1.6)	$	3,218.7	$	19.2	$	(208.8)	$	3,029.1
(1) Amortized cost presented above include $21.8 million of unamortized losses and $17.9 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 and 2022 transfer of securities from available-for-sale to held-to-maturity.

December 31, 2021	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-Sale:
U.S. Treasury notes	$	697.6	$	—	$	(12.9)	$	684.7
State, county, and municipal securities	434.7		2.1		(9.3)		427.5
Obligations of U.S. government agencies	356.0		0.1		(9.2)		346.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	2,027.3		14.1		(23.3)		2,018.1
Private mortgage-backed securities	174.4		0.1		(1.1)		173.4
Collateralized loan obligation	898.2		1.2		—		899.4
Corporate securities	271.1		3.0		(3.6)		270.5
Total	$	4,859.3	$	20.6	$	(59.4)	$	4,820.5

15

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

December 31, 2021	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held-to-Maturity:
State, county, and municipal securities	$	67.6	$	—	$	67.6	$	2.0	$	(0.4)	$	69.2
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations(1)	1,609.0		—		1,609.0		13.2		(35.3)		1,586.9
Corporate securities	11.0		—		11.0		0.4		—		11.4
Total	$	1,687.6	$	—	$	1,687.6	$	15.6	$	(35.7)	$	1,667.5
(1) Amortized cost presented above include $20.1 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 transfer of securities from available-for-sale to held-to-maturity.

On February 1, 2022, in conjunction with the acquisition of GWB and under ASC 320, the Company transferred debt securities classified as held-to-maturity with an amortized cost of $10.7 million and an estimated fair value of $10.9 million to the available-for-sale category classification and transferred debt securities classified as available-for-sale with an amortized cost of $485.9 million and an estimated fair value of $463.6 million to the held-to-maturity classification to maintain the Company’s intended risk profile. The transfer of debt securities into the available-for-sale and held-to-maturity categories were recorded at fair value on the date of transfer. This discount, as well as the related unrealized loss in accumulated other comprehensive income, will be amortized into interest income as a yield adjustment over the remaining term of the securities. The amortization of the unrealized loss reported in accumulated other comprehensive (loss) income will offset the effect on interest income of the accretion of the discount. No gains or losses were recorded at the time of transfer.

The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in an unrealized loss position as of March 31, 2022 and December 31, 2021.

	Less than 12 Months				12 Months or More				Total
March 31, 2022	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Available-for-Sale:
U.S. Treasury notes	$	644.9	$	(53.3)	$	—	$	—	$	644.9	$	(53.3)
State, county, and municipal securities	223.6		(22.7)		29.6		(5.1)		253.2		(27.8)
Obligations of U.S. government agencies	101.5		(5.4)		15.4		(1.3)		116.9		(6.7)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	3,238.5		(163.4)		84.9		(8.4)		3,323.4		(171.8)
Private mortgage-backed securities	274.8		(13.6)		—		—		274.8		(13.6)
Collateralized loan obligations	1,020.9		(4.5)		—		—		1,020.9		(4.5)
Corporate securities	146.7		(13.5)		19.3		(1.9)		166.0		(15.4)
Total	$	5,650.9	$	(276.4)	$	149.2	$	(16.7)	$	5,800.1	$	(293.1)

16

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

	Less than 12 Months				12 Months or More				Total
December 31, 2021	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Available-for-Sale:
U.S. Treasury notes	$	684.7	$	(12.9)	$	—	$	—	$	684.7	$	(12.9)
State, county, and municipal securities	278.7		(9.1)		5.0		(0.2)		283.7		(9.3)
Obligations of U.S. government agencies	297.0		(8.9)		16.4		(0.3)		313.4		(9.2)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	1,262.8		(23.0)		26.4		(0.3)		1,289.2		(23.3)
Private mortgage-backed securities	127.2		(1.1)		—		—		127.2		(1.1)
Corporate securities	109.9		(3.3)		20.9		(0.3)		130.8		(3.6)
Total	$	2,760.3	$	(58.3)	$	68.7	$	(1.1)	$	2,829.0	$	(59.4)

As of March 31, 2022 and December 31, 2021, there were no holdings of securities of any issuer, other than the U.S. government and its agencies, in an amount greater than 10% of stockholders’ equity.

During the three month period ended March 31, 2022, the Company acquired $2,356.9 million of available-for-sale securities and $342.1 million of held-to-maturity securities in connection with the acquisition of GWB. Such securities were evaluated and it was determined that there were no investment securities that met the definition of a PCD asset and classified as PCD upon acquisition.

The Company determines credit losses on both available-for-sale and held-to-maturity investment securities by a discounted cash flow approach using the security’s effective interest rate at the time of purchase or upon acquisition. The allowance for credit losses is measured as the amount by which an investment security’s amortized cost exceeds the net present value of expected future cash flows. However, the amount of credit losses for available-for-sale investment securities is limited to the amount of a security’s unrealized loss. Credit losses on held-to-maturity investment securities are representative of current expected credit losses that may be incurred over the life of the investment. The allowance for credit losses is established through a charge to provision for credit losses in current period earnings.

The available-for-sale securities portfolio contains securities that are guaranteed by a sovereign entity or are generally considered to have non-credit related risks, such as interest rate risk or prepayment and liquidity factors. The Company considers whether the securities are issued by the federal government or its agencies and whether downgrades by bond rating agencies have occurred. The Company had no allowance for credit losses for available-for-sale investment securities as of March 31, 2022 and December 31, 2021.

As of March 31, 2022 and December 31, 2021, the Company had 965 and 285 individual investment securities, respectively, that were in an unrealized loss position, which was related primarily to fluctuations in current interest rates. As of March 31, 2022, the Company had the intent and ability to hold these investment securities for a period of time sufficient to allow for an anticipated recovery. The Company does not intend to sell any of the available-for-sale securities in the above table and the Company does not anticipate it will have to sell any securities before a recovery in cost.

The following table presents the activity in the allowance for credit losses related to held-to-maturity securities classified as corporate and state, county, and municipal securities:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	—	$	—
Provision for credit loss expense	1.6		—
Ending balance of allowance for credit losses	$	1.6	$	—

There was no allowance for credit losses on held-to-maturity securities at December 31, 2021.

17

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

On a quarterly basis, the Company refreshes the credit quality of each held-to-maturity security. The following table summarizes the credit quality indicators of held-to-maturity securities at amortized cost for the periods indicated:

March 31, 2022	AAA		AA		A		BBB		Not Rated		Total
U.S. Treasury notes	$	296.2	$	—	$	—	$	—	$	—	$	296.2
State, county, and municipal securities	72.6		102.7		13.7		—		8.3		197.3
Obligations of U.S. government agencies	340.8		—		—		—		—		340.8
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC	1,958.2		—		—		—		—		1,958.2
GNMA	343.8		—		—		—		—		343.8
Corporate securities	—		—		4.0		75.0		5.0		84.0
Total	$	3,011.6	$	102.7	$	17.7	$	75.0	$	13.3	$	3,220.3

December 31, 2021	AAA		AA		A		BBB		Not Rated		Total
State, county, and municipal securities	$	17.2	$	31.6	$	14.7	$	—	$	4.1	$	67.6
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC	1,439.1		—		—		—		—		1,439.1
GNMA	169.9		—		—		—		—		169.9
Corporate securities	—		—		4.0		7.0		—		11.0
Total	$	1,626.2	$	31.6	$	18.7	$	7.0	$	4.1	$	1,687.6

As of March 31, 2022 and December 31, 2021, the Company had $23.6 million and $16.6 million, respectively, of accrued interest receivable on the consolidated balance sheet. The Company does not consider accrued interest receivable in the carrying amount of financial assets held at the amortized cost basis or in the allowance for credit losses calculation.

As of March 31, 2022 and December 31, 2021, there were no available-for-sale or held-to-maturity securities on nonaccrual status. All securities in the portfolio were current with their contractual principal and interest payments. As of March 31, 2022 and December 31, 2021, there were no collateral dependent available-for-sale or held-to-maturity securities.

There were no material gross realized gains and no material gross realized losses on the disposition of available-for-sale investment securities during the three month periods ended March 31, 2022 and 2021.

Maturities of securities do not reflect rate repricing opportunities present in adjustable-rate mortgage-backed securities. In the table below, the Company had variable rate mortgage-backed and corporate securities which had an amortized cost of $253.0 million and were classified as available-for-sale as of March 31, 2022. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.

	Available-for-Sale				Held-to-Maturity
March 31, 2022	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Within one year	$	926.6	$	886.6	$	377.1	$	355.3
After one year but within five years	2,724.4		2,592.0		1,334.1		1,274.0
After five years but within ten years	1,139.8		1,074.3		1,026.2		956.0
After ten years	1,784.3		1,730.9		482.9		443.8
Total	$	6,575.1	$	6,283.8	$	3,220.3	$	3,029.1

As of March 31, 2022, the Company held investment securities callable within one year having amortized costs and estimated fair values of $206.3 million and $202.3 million, respectively. These investment securities are primarily included in the “after five years but within ten years” category in the table above. As of March 31, 2022, the Company held no callable structured notes.

18

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

As of March 31, 2022 and December 31, 2021, the Company has amortized costs of $2,587.0 million and $2,617.8 million, respectively, for investment securities pledged to secure public deposits and securities sold under repurchase agreements and had approximate fair values of $2,421.8 million and $2,610.8 million, as of March 31, 2022 and December 31, 2021, respectively. All securities sold under repurchase agreements are with clients and mature on the next banking day. The Company retains possession of the underlying securities sold under repurchase agreements.

(5)     Loans Held for Sale

The following table presents loans held for sale by segment for the dates indicated:

	March 31, 2022		December 31, 2021
Loans Held for Sale:
Agricultural	$	132.1	$	—
Commercial	23.4		—
Residential real estate	22.6		30.1
Total loans held for sale	$	178.1	$	30.1

Residential real estate loans that the Company originated with the intent to sell are recorded at fair value. Conforming agency mortgage production is sold on a servicing retained basis. Certain loans, such as government guaranteed mortgage loans, are sold on a servicing released basis. The fair value of loans held for sale are primarily determined based on quoted prices for similar loans in active markets or outstanding commitments from third-party investors. Net unrealized losses, if any, are recorded as a valuation allowance and charged to non-interest income in the consolidated statements from operations. Net gains and losses on loan sales are recorded as a component of non-interest income.

As of March 31, 2022, loans held for sale included nonaccrual loans of $32.7 million, all of which were agricultural loans. There were no loans held for sale that were considered a troubled debt restructuring as of March 31, 2022.

On February 1, 2022, in conjunction with the acquisition of GWB, agricultural loans with a carrying value of $155.8 million and commercial loans with a carrying value of $24.0 million were reclassified as loans held for sale from loans held for investment due to management’s intent and decision to sell the loans.

During the period ended March 31, 2022, agricultural loans with a carrying value of $19.8 million were reclassified from loans held for sale to loans held for investment due to management’s change in intent and decision not to sell the loans. On the date of transfer, the amortized cost exceeded the fair value of the loans due to credit deterioration. The Company recorded a charge-off of $5.1 million to the allowance for credit losses, which established a new aggregate cost basis for the loans of $14.7 million on the date of transfer.

19

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(6)    Loans Held for Investment

The following table presents loans by segment as of the dates indicated:

	March 31, 2022		December 31, 2021
Real estate loans:
Commercial	$	7,805.7	$	3,971.5
Construction loans:
Land acquisition & development	344.8		247.8
Residential	406.0		262.0
Commercial	844.8		498.0
Total construction loans	1,595.6		1,007.8
Residential	1,997.5		1,538.2
Agricultural	833.6		213.9
Total real estate loans	12,232.4		6,731.4
Consumer loans:
Indirect	739.6		737.6
Direct and advance lines	142.5		129.2
Credit card	73.5		64.9
Total consumer loans	955.6		931.7
Commercial	3,017.9		1,475.5
Agricultural	744.3		203.9
Other, including overdrafts	4.6		1.5
Loans held for investment	16,954.8		9,344.0
Deferred loan fees and costs	(9.8)		(12.3)
Loans held for investment, net of deferred fees and costs	16,945.0		9,331.7
Allowance for credit losses	(247.2)		(122.3)
Net loans held for investment	$	16,697.8	$	9,209.4

20

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Allowance for Credit Losses

The following tables represent, by loan portfolio segment, the activity in the allowance for credit losses for loans held for investment:

Three Months Ended March 31, 2022	Beginning Balance		Initial ACL Recorded for PCD loans		Provision for (reversal of) Credit Losses (2)		Loans Charged-Off		Recoveries Collected		Ending Balance
Allowance for credit losses (1)
Real estate:
Commercial real estate:
Non-owner occupied	$	17.3	$	24.1	$	6.7	$	(2.9)	$	—	$	45.2
Owner occupied	13.3		9.5		4.6		(2.2)		—		25.2
Multi-family	13.3		29.9		11.4		—		—		54.6
Total commercial real estate	43.9		63.5		22.7		(5.1)		—		125.0
Construction:
Land acquisition & development	0.5		3.4		(0.8)		(2.7)		0.1		0.5
Residential construction	2.4		—		0.9		—		—		3.3
Commercial construction	6.0		0.2		4.0		—		—		10.2
Total construction	8.9		3.6		4.1		(2.7)		0.1		14.0
Residential real estate:
Residential 1-4 family	13.4		0.1		5.2		(0.1)		0.1		18.7
Home equity and HELOC	1.2		—		0.1		—		0.1		1.4
Total residential real estate	14.6		0.1		5.3		(0.1)		0.2		20.1
Agricultural real estate	1.9		2.3		6.4		(5.2)		—		5.4
Total real estate	69.3		69.5		38.5		(13.1)		0.3		164.5
Consumer:
Indirect	14.3		—		(0.3)		(0.9)		0.4		13.5
Direct and advance lines	4.6		—		(0.1)		(0.8)		0.9		4.6
Credit card	2.2		—		0.6		(0.6)		0.1		2.3
Total consumer	21.1		—		0.2		(2.3)		1.4		20.4
Commercial:
Commercial and floor plans	27.1		11.2		18.4		(4.2)		0.4		52.9
Commercial purpose secured by 1-4 family	4.4		0.2		0.4		—		—		5.0
Credit card	0.1		—		0.3		(0.1)		—		0.3
Total commercial	31.6		11.4		19.1		(4.3)		0.4		58.2
Agricultural:
Agricultural	0.3		3.4		(0.5)		(0.2)		1.1		4.1
Total agricultural	0.3		3.4		(0.5)		(0.2)		1.1		4.1
Total allowance for credit losses	$	122.3	$	84.3	$	57.3	$	(19.9)	$	3.2	$	247.2
(1) Amounts presented exclude the allowance for credit losses related to unfunded commitments. These amounts are included in Note “Financial Instruments with Off-Balance Sheet Risk” and the allowance for credit losses related to investment securities which are included in Note “Investment Securities” included in this report.
(2) Amounts include $68.3 million related to the acquired GWB non-PCD loans.

21

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Three Months Ended March 31, 2021	Beginning Balance		Provision for (reversal of) Credit Losses		Loans Charged-Off		Recoveries Collected		Ending Balance
Allowance for credit losses (1)
Real estate:
Commercial real estate:
Non-owner occupied	$	25.5	$	(2.5)	$	—	$	—	$	23.0
Owner occupied	18.3		(0.8)		(0.1)		—		17.4
Multi-family	11.0		0.8		—		—		11.8
Total commercial real estate	54.8		(2.5)		(0.1)		—		52.2
Construction:
Land acquisition & development	1.3		(0.2)		—		0.1		1.2
Residential construction	1.6		(0.2)		—		—		1.4
Commercial construction	7.3		(0.2)		—		0.1		7.2
Total construction	10.2		(0.6)		—		0.2		9.8
Residential real estate:
Residential 1-4 family	11.4		0.1		—		—		11.5
Home equity and HELOC	1.4		—		(0.1)		0.1		1.4
Total residential real estate	12.8		0.1		(0.1)		0.1		12.9
Agricultural real estate	2.7		0.1		—		—		2.8
Total real estate	80.5		(2.9)		(0.2)		0.3		77.7
Consumer:
Indirect	16.7		—		(1.3)		0.6		16.0
Direct and advance lines	4.6		0.7		(0.8)		0.3		4.8
Credit card	2.6		(0.7)		(0.6)		0.2		1.5
Total consumer	23.9		—		(2.7)		1.1		22.3
Commercial:
Commercial and floor plans	34.2		(1.8)		(1.8)		0.4		31.0
Commercial purpose secured by 1-4 family	4.7		(0.2)		—		0.2		4.7
Credit card	0.3		0.2		(0.2)		—		0.3
Total commercial	39.2		(1.8)		(2.0)		0.6		36.0
Agricultural:
Agricultural	0.7		(0.1)		—		—		0.6
Total agricultural	0.7		(0.1)		—		—		0.6
Total allowance for credit losses	$	144.3	$	(4.8)	$	(4.9)	$	2.0	$	136.6
(1) Amounts presented exclude the allowance for credit losses related to unfunded commitments. These amounts are included in Note “Financial Instruments with Off-Balance Sheet Risk” included in this report.

Collateral-Dependent Financial Loans

A collateral-dependent financial loan relies solely on the operation or sale of the collateral for repayment. In evaluating the overall risk associated with a loan, the Company considers (1) character, overall financial condition and resources, and payment record of the borrower; (2) the prospects for support from any financially responsible guarantors; and (3) the nature and degree of protection provided by the cash flow and value of any underlying collateral. The loan may become collateral-dependent when the borrower is experiencing financial difficulty and, its sources of repayment become inadequate over time. At such time, the Company develops an expectation that repayment will be provided substantially through the operation or sale of the collateral.

22

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The following tables present the amortized cost basis of collateral-dependent loans by class of loans as of the dates indicated:

	Collateral Type
As of March 31, 2022	Business Assets		Real Property		Other		Total
Real estate	$	0.2	$	67.5	$	—	$	67.7
Commercial	4.8		4.6		—		9.4
Agricultural	—		24.0		—		24.0
Total collateral-dependent	$	5.0	$	96.1	$	—	$	101.1

	Collateral Type
As of December 31, 2021	Business Assets		Real Property		Other		Total
Real estate	$	1.2	$	7.0	$	—	$	8.2
Commercial	1.8		1.0		—		2.8
Agricultural	—		0.7		—		0.7
Total collateral-dependent	$	3.0	$	8.7	$	—	$	11.7

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans classified in the following table as greater than 90 days past due continue to accrue interest. The following tables present the contractual aging of the Company’s recorded amortized cost basis in loans by portfolio as of the dates indicated.

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of March 31, 2022	Past Due		Past Due		Past Due		Past Due		Loans		Loans (1)		Loans
Real estate
Commercial	$	7.2	$	2.2	$	0.3	$	9.7	$	7,758.6	$	37.4	$	7,805.7
Construction:
Land acquisition & development	2.6		0.1		—		2.7		338.2		3.9		344.8
Residential	2.6		—		—		2.6		403.4		—		406.0
Commercial	0.4		—		—		0.4		844.4		—		844.8
Total construction loans	5.6		0.1		—		5.7		1,586.0		3.9		1,595.6
Residential	4.4		1.6		0.1		6.1		1,984.3		7.1		1,997.5
Agricultural	0.1		3.9		0.4		4.4		790.8		38.4		833.6
Total real estate loans	17.3		7.8		0.8		25.9		12,119.7		86.8		12,232.4
Consumer:
Indirect consumer	5.2		0.9		0.2		6.3		731.5		1.8		739.6
Other consumer	0.5		0.3		—		0.8		141.6		0.1		142.5
Credit card	0.3		0.2		0.4		0.9		72.6		—		73.5
Total consumer loans	6.0		1.4		0.6		8.0		945.7		1.9		955.6
Commercial	2.0		3.8		1.3		7.1		2,995.6		15.2		3,017.9
Agricultural	11.4		4.7		—		16.1		713.2		15.0		744.3
Other, including overdrafts	—		—		—		—		4.6		—		4.6
Loans held for investment	$	36.7	$	17.7	$	2.7	$	57.1	$	16,778.8	$	118.9	$	16,954.8

23

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of December 31, 2021	Past Due		Past Due		Past Due		Past Due		Loans		Loans (1)		Loans
Real estate
Commercial	$	1.1	$	1.0	$	0.6	$	2.7	$	3,960.8	$	8.0	$	3,971.5
Construction:
Land acquisition & development	0.2		—		—		0.2		246.9		0.7		247.8
Residential	4.2		—		—		4.2		257.8		—		262.0
Commercial	—		—		—		—		498.0		—		498.0
Total construction loans	4.4		—		—		4.4		1,002.7		0.7		1,007.8
Residential	3.0		0.8		0.1		3.9		1,531.4		2.9		1,538.2
Agricultural	1.9		0.2		—		2.1		206.9		4.9		213.9
Total real estate loans	10.4		2.0		0.7		13.1		6,701.8		16.5		6,731.4
Consumer:
Indirect consumer	5.1		1.4		0.4		6.9		729.0		1.7		737.6
Other consumer	0.5		0.2		0.1		0.8		128.3		0.1		129.2
Credit card	0.6		0.2		0.5		1.3		63.6		—		64.9
Total consumer loans	6.2		1.8		1.0		9.0		920.9		1.8		931.7
Commercial	4.9		0.7		1.1		6.7		1,463.8		5.0		1,475.5
Agricultural	0.7		—		—		0.7		201.6		1.6		203.9
Other, including overdrafts	—		—		—		—		1.5		—		1.5
Loans held for investment	$	22.2	$	4.5	$	2.8	$	29.5	$	9,289.6	$	24.9	$	9,344.0

(1) As of March 31, 2022 and December 31, 2021, none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three months ended March 31, 2022 and 2021, respectively. The Company reversed $1.0 million of accrued interest at March 31, 2022 and none for the same period in 2021.

Troubled Debt Restructurings

Modifications of performing loans are made in the ordinary course of business and are completed on a case-by-case basis through negotiation with the borrower in connection with the ongoing loan collection processes. Loan modifications are made to provide borrowers payment relief and typically include adjustments such as changes to interest rates, the implementation of interest only periods of less than twelve months, the deferment of short-term payments, and extension of amortization periods. A loan modification is considered a troubled debt restructuring if the borrower is experiencing financial difficulties and the Company, for economic or legal reasons, grants a concession to the borrower that it would not under other circumstances. Certain troubled loans are on non-accrual status at the time of debt restructuring. These restructured loans may be returned to accrual status if the borrower has exhibited sustained repayment performance in compliance with the restructuring agreement for a period of at least six months and the Company is reasonably assured of the borrower’s future performance. If the troubled debt restructuring meets these performance criteria, and the interest rate granted at the modification date is equal to or greater than the rate that the Company might grant for a new loan at the same time at comparable risk, then the loan will be reclassified to performing status and the accrual of interest will resume. Loans that return to performing status will continue to be evaluated individually for credit deterioration in the ordinary course of business.

The Company renegotiated loans in troubled debt restructurings in the amount of $23.0 million as of March 31, 2022, of which $8.3 million were included in non-accrual loans and $14.7 million were on accrual status. As of March 31, 2022, the Company allocated $0.6 million of its allowance for credit losses to these loans. The Company had no material commitments to lend additional funds to borrowers whose existing loans had been renegotiated or classified as non-accrual.

The Company renegotiated loans in troubled debt restructurings in the amount of $6.2 million as of December 31, 2021, of which $3.9 million were included in non-accrual loans and $2.3 million were on accrual status. As of December 31, 2021, the Company allocated $0.1 million of its allowance for credit losses to these loans. The Company had no material commitments to lend additional funds to borrowers whose existing loans had been renegotiated or classified as non-accrual.

24

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The Company had $17.2 million of new troubled debt restructurings during the three months ended March 31, 2022, which were primarily attributable to the GWB acquisition.

	Number of Notes	Type of Concession								Principal Balance at Restructure
Three Months Ended March 31, 2022		Interest only period		Extension of term or amortization schedule		Interest rate adjustment		Other (1)
Commercial real estate	2	$	3.2	$	4.2	$	—	$	—	$	7.4
Residential real estate	1	—		0.5		—		—		0.5
Agricultural real estate	1	—		8.9		—		—		8.9
Commercial	1	—		—		—		0.4		0.4
Total loans restructured during period	5	$	3.2	$	13.6	$	—	$	0.4	$	17.2
(1) Other includes concessions that reduce or defer payments for a specified period of time and/or concessions that do not fit into other designated categories.

For troubled debt restructurings that were on non-accrual status or otherwise deemed collateral-dependent before a modification, the Company may record an allowance for credit losses depending on the circumstances. In periods after modification, the Company continues to evaluate all troubled debt restructurings for possible credit deterioration and, where deterioration is observed, recognizes credit loss through the allowance. Additionally, the Company continues to work these loans through the credit cycle through charge-off, pay-off, or foreclosure. Financial effects of modifications of troubled debt restructurings may include principal loan forgiveness or other charge-offs directly related to the restructuring. The Company had no charge-offs directly related to modifying troubled debt restructurings during the three months ended March 31, 2022 or 2021.

The Company had no material troubled debt restructurings resulting in payment default during the previous 12 months ended March 31, 2022. The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or the loan is placed on non-accrual status after the modification.

The Company modified the terms of certain other loans with a total recorded investment of $94.7 million as of March 31, 2022, where the loan did not meet the definition of a troubled debt restructuring and the borrowers had not been experiencing financial difficulties or there were delays in a payment considered to be insignificant. The Company determines whether a borrower is experiencing financial difficulty by evaluating the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification as required under the Company’s internal underwriting policy.

Purchased Credit Deteriorated Loans (PCD)

The Company analyzes all acquired loans at the time of acquisition for more-than-insignificant deterioration in credit quality since their origination date. Such loans are classified as PCD, also referred to as PCD loans. Acquired loans classified as PCD are recorded at an initial amortized cost, which is comprised of the purchase price of the loans plus the initial allowance for credit losses for the loans, and any resulting discount or premium related to factors other than credit. The Company accounts for interest income on PCD loans using the interest method, whereby any purchase discounts or premiums are accreted or amortized into interest income as an adjustment of the loan’s yield.

The following table reconciles the par value, or initial amortized cost, of PCD loans acquired in the GWB acquisition as of the date of the acquisition with the purchase price (or initial fair value of the loans):

Purchase price (initial fair value)	$	606.9
Allowance for credit losses (1)	323.0
Discount attributable to other factors (2)	49.3
Par value (unpaid principal balance)	$	979.2

(1) For acquired PCD loans, an allowance of $323.0 million was required with a corresponding increase to the amortized cost basis as of the acquisition date. For PCD loans where all or a portion of the loan balance had been previously written-off by GWB, or would be subject to write-off under the Company’s charge-off policy, a CECL allowance of $238.7 million, included as part of the grossed-up loan balance at acquisition was immediately written-off. The net impact to the allowance for PCD assets on the acquisition date was $84.3 million.

(2) Non-credit discount includes the difference between the amortized cost basis and the unpaid principal balance of $31.2 million established on GWB PCD loans acquired and interest applied to principal of $18.1 million.

25

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Credit Quality Indicators

As part of the on-going and continuous monitoring of the credit quality of the Company’s loan portfolio, management tracks internally assigned risk classifications of loans based on relevant information about the ability of borrowers to service their debt. The factors considered by the Company include, among other factors, the borrower’s current financial information, historical payment experience, credit documentation, public information, and current economic trends. The Company analyzes loans individually to classify the credit risk of the loans. This analysis generally includes loans with an outstanding balance greater than $1.0 million, which are generally considered non-homogeneous loans, such as commercial loans and commercial real estate loans. This analysis is performed no less than on an annual basis, depending upon the size of exposure and the contractual obligations governing the borrower’s financial reporting frequency. Homogeneous loans, including small business loans, are typically managed by payment performance. The Company internally risk rates its loans in accordance with a Uniform Classification System developed jointly by the various bank regulatory agencies. The Uniform Classification System defines three broad categories of criticized assets, which the Company uses as credit quality indicators in addition to the 6 Pass ratings in its 10-point rating scale:

Special Mention — includes loans that exhibit a potential weakness in financial condition, loan structure, or documentation that warrants management’s close attention. If not promptly corrected, the potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Substandard — includes loans that are inadequately protected by the current net worth and paying capacity of the borrower which have well-defined weaknesses that jeopardize the liquidation of the debt. Although the primary source of repayment for a substandard loan may not currently be sufficient, collateral or other sources of repayment are sufficient to satisfy the debt. Continuance of a substandard loan is not warranted unless positive steps are taken to improve the worthiness of the credit.

Doubtful — includes loans that exhibit pronounced weaknesses based on currently existing facts, conditions, and values to a point where collection or liquidation for full repayment is highly questionable and improbable. Doubtful loans are required to be placed on non-accrual status and are assigned specific loss exposure.

Loans not meeting the criteria above that are analyzed individually as part of the above-described process are considered pass-rated loans.

The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale for the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	182.1	$	845.0	$	737.0	$	517.2	$	344.9	$	1,023.6	$	67.6	$	3,717.4
Special mention	—		33.4		5.9		21.6		34.0		37.1		—		132.0
Substandard	3.7		21.5		25.5		49.8		36.8		27.8		23.8		188.9
Doubtful	—		0.3		—		—		—		—		—		0.3
Total	$	185.8	$	900.2	$	768.4	$	588.6	$	415.7	$	1,088.5	$	91.4	$	4,038.6
Commercial real estate owner occupied:
Pass	$	189.4	$	843.8	$	585.4	$	336.9	$	220.4	$	585.0	$	54.7	$	2,815.6
Special mention	0.7		3.2		4.2		8.5		7.9		15.7		0.1		40.3
Substandard	6.8		6.1		4.2		6.3		15.4		22.0		0.2		61.0
Doubtful	—		—		—		—		1.8		2.0		—		3.8
Total	$	196.9	$	853.1	$	593.8	$	351.7	$	245.5	$	624.7	$	55.0	$	2,920.7

26

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial multi-family:
Pass	$	86.2	$	218.9	$	194.7	$	62.2	$	45.5	$	141.1	$	4.7	$	753.3
Special mention	—		—		—		—		—		0.1		—		0.1
Substandard	—		—		37.7		1.2		47.2		0.3		—		86.4
Doubtful	—		—		6.6		—		—		—		—		6.6
Total	$	86.2	$	218.9	$	239.0	$	63.4	$	92.7	$	141.5	$	4.7	$	846.4
Land, acquisition and development:
Pass	$	25.3	$	175.2	$	43.4	$	28.8	$	16.2	$	37.5	$	13.2	$	339.6
Special mention	—		—		0.1		—		0.2		0.4		—		0.7
Substandard	—		0.7		0.2		—		—		0.4		—		1.3
Doubtful	—		3.2		—		—		—		—		—		3.2
Total	$	25.3	$	179.1	$	43.7	$	28.8	$	16.4	$	38.3	$	13.2	$	344.8
Residential construction:
Pass	$	29.7	$	165.4	$	6.7	$	10.3	$	0.8	$	6.4	$	185.9	$	405.2
Substandard	—		—		0.4		—		—		0.4		—		0.8
Total	$	29.7	$	165.4	$	7.1	$	10.3	$	0.8	$	6.8	$	185.9	$	406.0
Commercial construction:
Pass	$	118.2	$	353.6	$	201.4	$	161.6	$	6.6	$	0.6	$	0.4	$	842.4
Substandard	—		—		—		2.4		—		—		—		2.4
Total	$	118.2	$	353.6	$	201.4	$	164.0	$	6.6	$	0.6	$	0.4	$	844.8
Agricultural real estate:
Pass	$	44.2	$	220.5	$	132.1	$	76.7	$	59.7	$	131.8	$	56.2	$	721.2
Special mention	—		7.1		2.8		1.2		12.7		7.6		10.0		41.4
Substandard	0.8		18.1		5.4		5.0		20.0		17.8		—		67.1
Doubtful	—		0.2		1.2		—		—		2.5		—		3.9
Total	$	45.0	$	245.9	$	141.5	$	82.9	$	92.4	$	159.7	$	66.2	$	833.6
Commercial and floor plans:
Pass	$	142.4	$	582.5	$	282.5	$	169.5	$	162.9	$	233.4	$	818.5	$	2,391.7
Special mention	—		4.1		0.6		1.1		1.3		3.0		18.1		28.2
Substandard	9.2		7.6		5.1		2.2		5.4		8.8		16.1		54.4
Doubtful	—		—		—		—		—		3.3		0.2		3.5
Total	$	151.6	$	594.2	$	288.2	$	172.8	$	169.6	$	248.5	$	852.9	$	2,477.8
Commercial purpose secured by 1-4 family:
Pass	$	48.0	$	152.9	$	78.0	$	37.6	$	35.5	$	53.3	$	15.5	$	420.8
Special mention	—		0.2		0.6		0.6		2.0		0.7		—		4.1
Substandard	0.1		1.3		1.2		0.7		0.5		1.5		0.1		5.4
Total	$	48.1	$	154.4	$	79.8	$	38.9	$	38.0	$	55.5	$	15.6	$	430.3
Agricultural:
Pass	$	25.9	$	137.5	$	40.6	$	15.1	$	12.3	$	9.5	$	396.4	$	637.3
Special mention	0.4		3.1		0.7		1.2		2.7		0.3		17.9		26.3
Substandard	1.8		25.8		6.8		0.9		4.4		1.1		34.8		75.6
Doubtful	—		—		—		—		2.5		0.9		—		3.4
Total	$	28.1	$	166.4	$	48.1	$	17.2	$	21.9	$	11.8	$	449.1	$	742.6

27

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

	December 31, 2021
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2021		2020		2019		2018		2017		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	507.9	$	452.2	$	237.9	$	150.4	$	76.3	$	409.0	$	15.3	$	1,849.0
Special mention	0.2		3.1		2.1		—		—		3.6		—		9.0
Substandard	3.9		15.3		2.3		0.7		1.0		12.4		—		35.6
Total	$	512.0	$	470.6	$	242.3	$	151.1	$	77.3	$	425.0	$	15.3	$	1,893.6
Commercial real estate owner occupied:
Pass	$	452.7	$	314.9	$	235.0	$	151.0	$	94.5	$	322.5	$	14.2	$	1,584.8
Special mention	1.3		3.2		1.5		7.4		3.5		13.8		—		30.7
Substandard	3.8		4.3		4.7		5.4		2.7		20.3		—		41.2
Total	$	457.8	$	322.4	$	241.2	$	163.8	$	100.7	$	356.6	$	14.2	$	1,656.7
Commercial multi-family:
Pass	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Total	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Land, acquisition and development:
Pass	$	113.0	$	41.5	$	34.2	$	14.8	$	19.8	$	20.8	$	1.2	$	245.3
Special mention	—		0.1		—		—		0.1		0.3		—		0.5
Substandard	0.8		0.2		—		0.6		0.3		0.1		—		2.0
Total	$	113.8	$	41.8	$	34.2	$	15.4	$	20.2	$	21.2	$	1.2	$	247.8
Residential construction:
Pass	$	112.4	$	7.0	$	13.7	$	0.9	$	—	$	—	$	127.2	$	261.2
Substandard	—		0.4		—		—		0.4		—		—		0.8
Total	$	112.4	$	7.4	$	13.7	$	0.9	$	0.4	$	—	$	127.2	$	262.0
Commercial construction:
Pass	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Total	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Agricultural real estate:
Pass	$	58.3	$	36.9	$	35.1	$	22.6	$	11.8	$	28.1	$	4.9	$	197.7
Special mention	0.1		1.3		1.2		0.1		0.1		0.9		0.9		4.6
Substandard	4.0		0.4		1.0		0.6		1.3		4.3		—		11.6
Total	$	62.4	$	38.6	$	37.3	$	23.3	$	13.2	$	33.3	$	5.8	$	213.9
Commercial and floor plans:
Pass	$	394.2	$	165.7	$	94.5	$	73.5	$	47.1	$	91.3	$	224.7	$	1,091.0
Special mention	0.8		11.4		0.8		0.8		3.0		2.3		7.0		26.1
Substandard	1.3		2.8		1.6		2.6		0.6		4.1		2.6		15.6
Total	$	396.3	$	179.9	$	96.9	$	76.9	$	50.7	$	97.7	$	234.3	$	1,132.7
Commercial purpose secured by 1-4 family:
Pass	$	94.9	$	55.0	$	27.8	$	23.1	$	15.3	$	32.2	$	14.4	$	262.7
Special mention	—		0.2		0.2		0.5		0.1		0.6		—		1.6
Substandard	1.3		1.2		0.6		0.6		0.2		1.3		0.1		5.3
Total	$	96.2	$	56.4	$	28.6	$	24.2	$	15.6	$	34.1	$	14.5	$	269.6
Agricultural:
Pass	$	35.1	$	16.2	$	9.0	$	5.4	$	2.1	$	1.6	$	108.9	$	178.3
Special mention	0.2		4.1		0.1		0.4		0.6		0.3		7.0		12.7
Substandard	4.9		0.7		0.6		2.5		—		0.1		2.6		11.4
Total	$	40.2	$	21.0	$	9.7	$	8.3	$	2.7	$	2.0	$	118.5	$	202.4

28

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The Company evaluates the credit quality, loan performance, and the allowance for credit losses of its residential and consumer loan portfolios based primarily on the aging status of the loan and borrower payment activity. Accordingly, loans on nonaccrual status, loans past due 90 days or more and still accruing interest, and loans modified under troubled debt restructurings are considered nonperforming for purposes of credit quality evaluation. The following tables present the recorded investment of our other loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Residential 1-4 family:
Performing	$	34.5	$	446.5	$	581.5	$	112.5	$	35.5	$	260.3	$	0.9	$	1,471.7
Nonperforming	—		—		0.1		0.3		0.3		3.8		—		4.5
Total	$	34.5	$	446.5	$	581.6	$	112.8	$	35.8	$	264.1	$	0.9	$	1,476.2
Consumer home equity and HELOC:
Performing	$	4.6	$	16.5	$	10.6	$	5.8	$	6.9	$	19.5	$	454.8	$	518.7
Nonperforming	—		0.5		0.2		0.2		0.1		1.1		0.5		2.6
Total	$	4.6	$	17.0	$	10.8	$	6.0	$	7.0	$	20.6	$	455.3	$	521.3
Consumer indirect:
Performing	$	78.4	$	251.6	$	187.0	$	94.4	$	54.9	$	71.3	$	—	$	737.6
Nonperforming	—		0.5		0.5		0.3		0.2		0.5		—		2.0
Total	$	78.4	$	252.1	$	187.5	$	94.7	$	55.1	$	71.8	$	—	$	739.6
Consumer direct and advance line:
Performing	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5
Total	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5

	December 31, 2021
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2021		2020		2019		2018		2017		Prior		Revolving Loans Amortized Cost Basis		Total
Residential 1-4 family:
Performing	$	360.9	$	477.0	$	74.7	$	27.5	$	25.7	$	176.5	$	—	$	1,142.3
Nonperforming	—		0.3		—		—		0.2		0.8		—		1.3
Total	$	360.9	$	477.3	$	74.7	$	27.5	$	25.9	$	177.3	$	—	$	1,143.6
Consumer home equity and HELOC:
Performing	$	11.1	$	7.0	$	3.7	$	4.8	$	3.6	$	12.0	$	350.7	$	392.9
Nonperforming	0.3		—		0.3		—		0.6		0.5		—		1.7
Total	$	11.4	$	7.0	$	4.0	$	4.8	$	4.2	$	12.5	$	350.7	$	394.6
Consumer indirect:
Performing	$	272.6	$	208.6	$	108.3	$	64.0	$	37.0	$	45.0	$	—	$	735.5
Nonperforming	0.5		0.5		0.4		0.2		0.1		0.4		—		2.1
Total	$	273.1	$	209.1	$	108.7	$	64.2	$	37.1	$	45.4	$	—	$	737.6
Consumer direct and advance line:
Performing	$	42.5	$	27.9	$	15.0	$	13.3	$	5.8	$	7.6	$	16.9	$	129.0
Nonperforming	0.1		—		—		0.1		—		—		—		0.2
Total	$	42.6	$	27.9	$	15.0	$	13.4	$	5.8	$	7.6	$	16.9	$	129.2

29

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

While the Company considers the performance of the loan portfolio on the allowance for credit losses, for certain credit card loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity of the credit card holder. The following table presents the recorded investment in credit card loans based on payment activity for the periods indicated:

As of March 31, 2022	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	73.1	$	109.5	$	1.8	$	184.4
Nonperforming	0.4		0.3		—		0.7
Total credit card	$	73.5	$	109.8	$	1.8	$	185.1

As of December 31, 2021	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	64.4	$	73.1	$	1.5	$	139.0
Nonperforming	0.5		0.1		—		0.6
Total credit card	$	64.9	$	73.2	$	1.5	$	139.6

In the normal course of business, there were no material purchases of portfolio loans and no material sales of loans held for investment during the three months ended March 31, 2022 or 2021.

(7)    Other Real Estate Owned

Other real estate owned is a category of real estate owned by the Company as a result of a default by the borrower. Information with respect to the Company’s other real estate owned is reflected in the following table:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	2.0	$	2.5
OREO acquired through acquisition	15.8		—
Additions	—		0.3
Dispositions	(0.3)		(0.6)
Ending balance	$	17.5	$	2.2

The carrying value of foreclosed residential real estate properties included in other real estate owned was $0.2 million as of March 31, 2022 and $0.2 million as of December 31, 2021. The Company had recorded investments in consumer mortgage loans secured by residential real estate for which formal foreclosure proceedings were in process of foreclosure of $0.4 million and $0.2 million as of March 31, 2022 and December 31, 2021, respectively.

(8)    Derivatives and Hedging Activities

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through the management of its business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and through the use of derivative financial instruments. The Company enters into derivative financial instruments, such as interest rate swap contracts to manage or hedge exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates and interest rate exposures. The Company does not enter into interest rate swap agreements for trading or speculative purposes.

In the normal course of business, the Company enters into interest rate lock commitments to finance residential mortgage loans that are not designated as accounting hedges. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee, provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. Interest rate risk arises on these commitments and subsequently on closed loans if interest rates change between the time of the interest rate lock and the delivery of the loan to the investor. Loan commitments related to residential mortgage loans intended to be sold are considered derivatives and are marked to market through earnings. In addition to the effects of the change in market interest rate, the fair value measurement of the derivative also contemplates the expected cash flows to be received from the counterparty from the future sale of the loan.

30

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The Company sells residential mortgage loans on either a best efforts or mandatory delivery basis. The Company mitigates the effect of the interest rate risk inherent in providing interest rate lock commitments by entering into forward loan sales contracts. The forward loan sales contracts are marked to market through earnings and are not designated as accounting hedges during the interest rate lock commitment period and through the duration of the forward loan sales contracts. Exclusive of the fair value component associated with the projected cash flows from the loan delivery to the investor, the changes in fair value related to movements in market rates of the interest rate lock commitments and the forward loan sales contracts generally move in opposite directions, and the net impact of changes in these valuations on net income during the loan commitment period is generally inconsequential. When the loan is funded to the borrower, the interest rate lock commitment derivative expires, and the Company records a loan held for sale. The forward loan sales contract acts as a hedge against the variability in cash to be received from the loan sale. The changes in measurement of the estimated fair values of the interest rate lock commitments and forward loan sales contracts are included in mortgage banking revenues in the accompanying consolidated statements of income.

The Company also enters into certain interest rate swap contracts that are not designated as hedging instruments. These derivative contracts relate to transactions in which the Company enters into an interest rate swap with a client while at the same time entering into an offsetting interest rate swap with a third-party financial institution. Because the Company acts as an intermediary for the client, changes in the fair value of the underlying derivative contracts for the most part offset each other and do not significantly impact the Company’s results of operations.

Cash Flow Hedges of Interest Rate Risk

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. During 2021 and the first quarter of 2022, such derivatives were used to hedge the variable cash flows associated with the existing variable-rate borrowings (trust preferred securities).

For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive (loss) income and subsequently reclassified into interest expense in the same period(s) during which the hedged transaction affects earnings. Amounts reported in accumulated other comprehensive (loss) income related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate liabilities. During the next twelve months, the Company estimates that no material amounts will be reclassified as an increase to interest expense.

Fair Value Hedges of Interest Rate Risk

The Company is exposed to changes in the fair value of fixed-rate assets due to changes in benchmark interest rates. The Company uses interest rate swaps to manage its exposure to changes in fair value on these instruments attributable to changes in the designated benchmark interest rate. Interest rate swaps designated as fair value hedges involve the payment of fixed-rate amounts to a counterparty in exchange for the Company receiving variable-rate payments over the life of the agreements without the exchange of the underlying notional amount. During 2021, the Company entered into two forward starting, fixed interest rate fair value hedges associated with U.S. Treasury securities.

For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in interest income.

The following amounts were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges for the periods indicated:

	March 31, 2022				December 31, 2021
	Carrying Amount of the Hedged Assets/(Liabilities)		Cumulative Amount of Fair Value Hedging Adjustment		Carrying Amount of the Hedged Assets/(Liabilities)		Cumulative Amount of Fair Value Hedging Adjustment
Available-for-sale securities	$	674.5	$	(25.5)	$	695.6	$	(4.4)

31

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Non-designated Hedge Derivatives

Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers. The Company executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting derivatives that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings.

Risk Participation Agreements

The Company acquired from GWB risk participation agreements under which it assumes credit risk associated with a borrower’s performance related to derivative contracts. The Company only enters into these credit risk participation agreements in instances in which the Company is also a party to the related loan participation agreements for such borrowers. The Company manages its credit risk under risk participation agreements by monitoring the creditworthiness of the borrower, based on its normal credit review process.

The following table summarizes the fair values of our derivative instruments on a gross and net basis for the periods indicated. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow us to settle all derivative contracts with a single counterparty on a net basis and to offset the net derivative position with the related cash collateral. Securities collateral related to legally enforceable master netting agreements is not offset on the balance sheet.

	March 31, 2022					December 31, 2021
	Notional Amount		Balance Sheet Location	Estimated Fair Value		Notional Amount		Balance Sheet Location	Estimated Fair Value
Derivatives designated as hedges:
Interest rate swap contracts	$	700.0		$	25.3	$	700.0		$	4.1
Derivatives not designated as hedges:
Interest rate swap contracts	1,827.1			0.3		913.9			22.2
Interest rate lock commitments	107.6			—		77.3			1.8
Forward loan sales contracts	81.2			1.3		—			—
Derivative assets in the balance sheet	$	2,715.9	Other Assets	$	26.9	$	1,691.2	Other Assets	$	28.1
Derivatives designated as hedges:
Interest rate swap contracts	$	46.4		$	—	$	87.6		$	0.1
Derivatives not designated as hedges:
Interest rate swap contracts	1,827.1			62.3		913.9			18.1
Risk participation agreements	109.6			0.4		—			—
Forward loan sales contracts	—			—		102.4			—
Derivative liabilities in the balance sheet	$	1,983.1	Accrued Expenses	$	62.7	$	1,103.9	Accrued Expenses	$	18.2

There were no material effects of derivative instruments in fair value or cash flow hedge accounting on accumulated other comprehensive (loss) income during the three months ended March 31, 2022 or 2021.

There were no material effects from the Company’s fair value or cash flow hedged derivative financial instruments on the income statement during the three months ended March 31, 2022 or 2021.

32

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The table below presents the effect of the Company’s derivative financial instruments that are not designated as hedging instruments on the income statement for the periods indicated:

	Three Months Ended March 31,
		2022		2021
	Location of Gain Recognized in Income on Derivative	Amount of Gain Recognized in Income on Derivative
Interest rate lock commitments	Mortgage banking revenues	$	0.5	$	0.3

The Company recorded fee revenues of $2.0 million and $1.1 million for the three months ended March 31, 2022 and March 31, 2021, respectively. The Company includes swap fee revenues in other service charges, commissions, and fees.

The tables below present the gross presentation, the effects of offsetting, and a net presentation of the Company’s derivatives as of the periods indicated:

	March 31, 2022
	Gross Assets Recognized		Gross Assets Offset in the Balance Sheet		Net Assets in the Balance Sheet		Financial Instruments		Cash Collateral Received		Net Amount
Interest rate swap contracts	$	25.6	$	—	$	25.6	$	—	$	6.4	$	19.2
Mortgage related derivatives	1.3		—		1.3		—		—		1.3
Total derivatives	26.9		—		26.9		—		6.4		20.5
Total assets	$	26.9	$	—	$	26.9	$	—	$	6.4	$	20.5
	Gross Liabilities Recognized		Gross Liabilities Offset in the Balance Sheet		Net Liabilities in the Balance Sheet		Financial Instruments		Cash Collateral Posted		Net Amount
Interest rate swap contracts	$	62.3	$	—	$	62.3	$	—	$	1.0	$	61.3
Risk participation agreements	0.4		—		0.4		—		—		0.4
Total derivatives	62.7		—		62.7		—		1.0		61.7
Repurchase agreements	1,071.0		—		1,071.0		—		1,071.0		—
Total liabilities	$	1,133.7	$	—	$	1,133.7	$	—	$	1,072.0	$	61.7

	December 31, 2021
	Gross Assets Recognized		Gross Assets Offset in the Balance Sheet		Net Assets in the Balance Sheet		Financial Instruments		Cash Collateral Received		Net Amount
Interest rate swap contracts	$	26.3	$	—	$	26.3	$	—	$	8.0	$	18.3
Mortgage related derivatives	1.8		—		1.8		—		—		1.8
Total derivatives	28.1		—		28.1		—		8.0		20.1
Total assets	$	28.1	$	—	$	28.1	$	—	$	8.0	$	20.1
	Gross Liabilities Recognized		Gross Liabilities Offset in the Balance Sheet		Net Liabilities in the Balance Sheet		Financial Instruments		Cash Collateral Posted		Net Amount
Interest rate swap contracts	$	18.2	$	—	$	18.2	$	—	$	—	$	18.2
Total derivatives	18.2		—		18.2		—		—		18.2
Repurchase agreements	1,051.1		—		1,051.1		—		1,051.1		—
Total liabilities	$	1,069.3	$	—	$	1,069.3	$	—	$	1,051.1	$	18.2

Credit-risk-related Contingent Feature

The Company has agreements with each of its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations.

33

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The Company has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well / adequately capitalized institution, then in certain instances the Company could be required to post additional capital and in certain instances the counterparty would have the right to terminate the derivative positions and the Company would be required to settle its obligations under the agreements.

As of March 31, 2022, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, was $1.3 million related to these agreements. As of March 31, 2022, the Company has minimum collateral posting thresholds with certain of its derivative counterparties and has posted excess collateral of $0.3 million. If the Company had breached any of these provisions at March 31, 2022, it could have been required to settle its obligations under the agreements at their termination value of $1.3 million.

(9)    Capital Stock

On March 25, 2022, all outstanding shares of the Company’s Class B common stock automatically converted into shares of the Company’s Class A common stock on a one-for-one basis, pursuant to the terms of the Company’s Third Amended and Restated Articles of Incorporation, as amended (the “Charter”). No additional shares of Class B common stock are permitted to be issued. The conversion occurred automatically pursuant to the Company’s Charter because the number of the Company’s outstanding shares of Class B common stock represented on March 25, 2022, the record date for determining the shareholders of the Company entitled to notice of, and to vote at, the Company’s upcoming 2022 Annual Meeting of Shareholders, was less than twenty percent (20%) of the aggregate number of all of the outstanding shares of Class A common stock and Class B common stock of the Company. The former holders of Class B common stock now hold Class A common stock with the same voting powers, preferences, rights and qualifications, limitations and restrictions as the other holders of Class A common stock. All shares of the Company’s outstanding capital stock are now composed solely of shares of Class A common stock and are entitled to one vote per share. The Company’s Class A common stock will continue to trade on the NASDAQ Stock Market under the ticker symbol “FIBK”

The Company had 109,503,010 shares of Class A common stock outstanding as of March 31, 2022. The Company had 41,699,409 shares of Class A common stock and 20,501,047 shares of Class B common stock outstanding as of December 31, 2021.

On February 1, 2022, the Company issued 46,879,601 shares of its Class A common stock with an aggregate value of approximately $1.7 billion as consideration for the acquisition of Great Western. During the three months ended March 31, 2022 and 2021, the Company also issued 7,503 shares and 604 shares, respectively, of its Class A common stock to directors for their annual service on the Company's board of directors. The aggregate value of the shares issued to directors is included in employee benefits in the consolidated statement of income and in stock-based compensation expense in the consolidated statements of changes in stockholders' equity.

On June 11, 2019, the Company’s board of directors adopted a stock repurchase program pursuant to which the Company may repurchase up to 2.5 million of its outstanding shares of Class A common stock. On September 12, 2020, the Company’s board of directors increased the number of shares of Class A common stock authorized to be repurchased by the Company under the stock repurchase program by an additional 3.0 million shares for a total of 5.5 million shares. There were no shares repurchased under the program during the three months ended March 31, 2022. During the three months ended March 31, 2021, the Company repurchased and retired 72,700 shares of our Class A common stock at a total cost of $2.9 million, including costs and commissions, at an average cost of $39.69 per share. The shares of common stock repurchased during the period represented 1.3% of the total 5.5 million shares authorized to be repurchased. As of March 31, 2022, there were 1.9 million shares remaining authorized under the repurchase program.

All other stock repurchases during the three months ended March 31, 2022 and 2021, were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants in the Company’s equity compensation plans.

34

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(10)    Earnings per Common Share

Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period presented, excluding unvested restricted stock. Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares determined for the basic earnings per share computation plus the dilutive effects of stock-based compensation using the treasury stock method.

The following table sets forth the computation of basic and diluted earnings per share for the periods presented:

	Three Months Ended March 31,
	2022		2021
Net (loss) income	$	(33.4)	$	51.4
Weighted average common shares outstanding for basic earnings per share computation	92,855,173		61,591,877
Dilutive effects of stock-based compensation	—		122,186
Weighted average common shares outstanding for diluted earnings per common share computation	92,855,173		61,714,063
Basic (loss) earnings per common share	$	(0.36)	$	0.83
Diluted (loss) earnings per common share	$	(0.36)	$	0.83
Anti-dilutive unvested time restricted stock	55,504		92,602

The Company had 537,374 and 368,793 shares of unvested restricted stock as of March 31, 2022 and 2021, respectively, that were not included in the computation of diluted earnings per common share because performance conditions for vesting had not been met. As a result of incurring a net loss during the three months ended March 31, 2022, potential common shares of 71,379 were excluded from diluted loss per share because the effect would have been anti-dilutive.

(11)    Regulatory Capital

As of March 31, 2022 and December 31, 2021, the Company exceeded all capital adequacy requirements to which it is subject. Actual capital amounts and ratios for the Company and its subsidiary Bank, as of March 31, 2022 and December 31, 2021 are presented in the following tables: 

	Actual				Minimum Required for Capital Adequacy Purposes				For Capital Adequacy Purposes Plus Capital Conservation Buffer				Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
March 31, 2022	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital:
Consolidated	$	2,930.9	14.27	%	$	1,643.5	8.00	%	$	2,157.1	10.50	%	$	2,054.4	10.00	%
FIB	2,787.3		13.61		1,638.3		8.00		2,150.2		10.50		2,047.9		10.00
Tier 1 risk-based capital:
Consolidated	2,446.7		11.91		1,232.6		6.00		1,746.2		8.50		1,643.5		8.00
FIB	2,560.7		12.50		1,228.7		6.00		1,740.7		8.50		1,638.3		8.00
Common equity tier 1 risk-based capital:
Consolidated	2,446.7		11.91		924.5		4.50		1,438.1		7.00		1,335.3		6.50
FIB	2,560.7		12.50		921.5		4.50		1,433.5		7.00		1,331.1		6.50
Leverage capital ratio:
Consolidated	2,446.7		8.96		1,091.7		4.00		1,091.7		4.00		1,364.6		5.00
FIB	2,560.7		9.36		1,093.8		4.00		1,093.8		4.00		1,367.2		5.00

35

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

	Actual				Minimum Required for Capital Adequacy Purposes				For Capital Adequacy Purposes Plus Capital Conservation Buffer				Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
December 31, 2021	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital:
Consolidated	$	1,659.3	14.11	%	$	940.9	8.00	%	$	1,235.0	10.50	%	$	1,176.2	10.00	%
FIB	1,472.5		12.56		938.0		8.00		1,231.1		10.50		1,172.5		10.00
Tier 1 risk-based capital:
Consolidated	1,469.0		12.49		705.7		6.00		999.7		8.50		940.9		8.00
FIB	1,382.2		11.79		703.5		6.00		996.6		8.50		938.0		8.00
Common equity tier 1 risk-based capital:
Consolidated	1,384.8		11.77		529.3		4.50		823.3		7.00		764.5		6.50
FIB	1,382.2		11.79		527.6		4.50		820.8		7.00		762.1		6.50
Leverage capital ratio:
Consolidated	1,469.0		7.68		765.5		4.00		765.5		4.00		956.9		5.00
FIB	1,382.2		7.24		764.1		4.00		764.1		4.00		955.1		5.00

(1) The ratios to meet the requirements to be deemed “well-capitalized” are only applicable to FIB. However, the Company manages its capital position as if the requirements apply to the consolidated company and has presented the ratios as if they also applied on a consolidated basis.

In connection with the adoption of the Current Expected Credit Loss accounting standard (“CECL”), or ASC 326, on January 1, 2020, the Company recognized an after-tax cumulative effect reduction to retained earnings totaling $24.1 million. In March 2020, the Office of the Comptroller of Currency, the Board of Governors of the Federal Reserve System, and the FDIC issued an interim final rule that allows banking organizations to mitigate the effects of ASC 326 on their regulatory capital computations. This interim rule is in addition to the three-year transition period already in place under the capital transition rule previously issued in February 2019. Banking organizations can elect to mitigate the estimated cumulative regulatory capital effects for an additional two years. This rule allows an institution to defer transitioning the impact of ASC 326 into its regulatory capital calculation, including ratios, over an extended period. Additionally, the interim rule extends the transition period whereby an institution can defer the impact from ASC 326 on the current period, determined based on the difference between the new ASC 326 allowance for credit losses and the allowance for loan losses under the incurred loss method from previous GAAP, for up to two years. The total impact related to ASC 326 would then be transitioned into regulatory capital and the associated ratios over a three-year transition period, beginning after the initial two-year deferral period, for a total transition period of five years. The Company has elected to opt into the transition election and is adopting transition relief over the permissible five-year period.

(12)    Commitments and Contingencies

In the normal course of business, the Company is involved in various claims and litigation. The Company establishes accruals for legal matters when potential losses associated with the actions become probable and the amount of loss can be reasonably estimated. There is no assurance that the ultimate resolution of these matters will not significantly exceed the amounts that the Company has accrued. Accruals for legal matters are based on management’s best judgment after consultation with counsel and others. In the opinion of management, following consultation with legal counsel, the ultimate liability or disposition of all such claims and litigation is not expected to have a material adverse effect on the consolidated financial condition, results of operations, or liquidity of the Company.

As of March 31, 2022, the Company had commitments under construction contracts of $6.7 million.

Residential mortgage loans sold to investors in the secondary market are sold with varying recourse provisions. Essentially all the loan sales agreements require the repurchase of a mortgage loan by the seller in situations such as breach of representation, warranty, or covenant; untimely document delivery; false or misleading statements; failure to obtain certain certificates or insurance; or unmarketability. Certain loan sales agreements contain repurchase requirements based on payment-related defects that are defined in terms of the number of days or months since the purchase, the sequence number of the payment, and/or the number of days of payment delinquency. Based on the

36

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

specific terms stated in the agreements, the Company had $0.8 million of sold residential mortgage loans with recourse provisions still in effect as of March 31, 2022.

(13)    Financial Instruments with Off-Balance Sheet Risk

In the normal course of business, the Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its clients. These financial instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of amounts recorded in the consolidated balance sheets. Commitments to extend credit are agreements to lend to a client so long as there is no violation of any condition established in the commitment contract. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a client to a third party. The credit risk involved in issuing letters of credit is essentially the same as the credit risk involved in extending loan facilities to clients. The Company’s policy for obtaining collateral, and determining the nature of such collateral, is essentially the same as in the Company’s policies for making commitments to extend credit. The estimated fair value of the obligation undertaken by the Company in issuing standby letters of credit is included in accounts payable and accrued expenses in the Company’s consolidated balance sheets.    

The following table presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	3.8	$	3.7
Provision for (reversal of) credit loss expense	2.4		(0.3)
Ending balance of allowance for off-balance sheet credit losses	$	6.2	$	3.4

	March 31, 2022		December 31, 2021
Unused credit card lines	$	819.0	$	681.6
Commitments to extend credit	4,899.4		2,539.8
Standby letter of credit	100.2		57.5

(14)    Other Comprehensive Loss

The gross amounts of each component of other comprehensive loss and the related tax effects are as follows:

	Pre-tax				Tax Expense (Benefit)				Net of Tax
Three Months Ended March 31,	2022		2021		2022		2021		2022		2021
Investment securities available-for sale:
Change in net unrealized loss during period	$	(252.6)	$	(66.8)	$	(62.7)	$	(17.0)	$	(189.9)	$	(49.8)
Reclassification adjustment for net loss included in net income	0.1		—		—		—		0.1		—
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	0.2		—		0.1		—		0.1		—
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity	(23.0)		—		(5.7)		—		(17.3)		—
Change in net unrealized loss (gain) on derivatives	21.3		(0.1)		5.3		—		16.0		(0.1)
Total other comprehensive loss	$	(254.0)	$	(66.9)	$	(63.0)	$	(17.0)	$	(191.0)	$	(49.9)

The components of accumulated other comprehensive loss, net of related tax effects, are as follows:

	March 31, 2022		December 31, 2021
Net unrealized loss on investment securities available-for-sale	$	(218.1)	$	(29.0)
Net unrealized (loss) gain on investment securities transferred to held-to-maturity	(2.9)		15.0
Net unrealized gain on derivatives	19.0		3.0
Net accumulated other comprehensive loss	$	(202.0)	$	(11.0)

37

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

(15)    Fair Value Measurements        

Fair value is defined as the price that would be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The three levels of inputs that may be used to measure fair value are as follows:

•Level 1 - Quoted prices in active markets for identical assets or liabilities

•Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities

•Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of assets or liabilities

The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date, and therefore are classified within Level 2 of the valuation hierarchy. There have been no significant changes in the valuation techniques during the three months ended March 31, 2022 and 2021.

The Company’s policy is to recognize transfers between levels as of the end of the reporting period. Transfers in and out of Level 1, Level 2, and Level 3 are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the three months ended March 31, 2022 and 2021.

Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below:

Investment Debt Securities Available-for-Sale. The Company obtains fair value measurements for investment securities from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. If needed, a broker may be utilized to determine the reported fair value of investment securities.

Loans Held for Sale. Fair value measurements for residential mortgage loans held for sale are obtained from an independent pricing service. The fair value measurements consider observable data that may include binding contracts or quotes or bids from third party investors as well as loan level pricing adjustments. Commercial and agricultural loans held for sale are derived from quotes or bids from third party investors.

Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data. The inputs used to determine fair value include the three-month LIBOR forward curve to estimate variable rate cash inflows and the federal funds effective swap rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The change in the value of derivative assets attributable to basis risk, or the risk that offsetting investments in a hedging strategy will not experience price changes in entirely opposite directions from each other, was not significant in the reported periods. The Company also obtains and compares the reasonableness of the pricing from an independent third party.

For purposes of potential valuation adjustments to our derivative positions, we evaluate the credit risk of our counterparties as well as ours. Accordingly, we have considered factors such as the likelihood of our default and the default of our counterparties, our net exposures and remaining contractual life, among other things, in determining if any fair value adjustments related to credit risk are required. The change in value of derivative assets and derivative liabilities attributable to credit risk was not significant during the reported periods.

38

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

Interest Rate Lock Commitments. Fair value measurements for interest rate lock commitments are obtained from an independent pricing service. The fair value measurements consider observable data that may include prices available from secondary market investors taking into consideration various characteristics of the loan, including the loan amount, interest rate, value of the servicing, and loan to value ratio, among other things. Observable data is then adjusted to reflect changes in interest rates, the Company’s estimated pull-through rate, and estimated direct costs necessary to complete the commitment into a closed loan net of origination and processing fees collected from the borrower.

Forward Loan Sales Contracts. The fair value measurements for forward loan sales contracts are obtained from an independent pricing service. The fair value measurements consider observable data that includes sales of similar loans.

Deferred Compensation Plan Assets and Liabilities. The fair values of deferred compensation plan assets and liabilities are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. These investments are in the same funds and purchased in the same amounts as the participants’ selected investments, which represent the underlying liabilities to plan participants. Deferred compensation plan liabilities are recorded at amounts due to participants, based on the fair value of participants’ selected investments.

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:
U.S. Treasury notes	$	644.9	$	644.9	$	—	$	—
State, county, and municipal securities	292.7			—	292.7			—
Obligations of U.S. government agencies	137.9			—	137.9			—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	3,645.7			—	3,645.7			—
Private mortgage-backed securities	274.8			—	274.8			—
Collateralized loan obligations	1,070.9			—	1,070.9			—
Corporate securities	216.9			—	216.9			—
Loans held for sale	178.1			—	178.1			—
Derivative assets:
Interest rate swap contracts	25.6			—	25.6			—
Forward loan sale contracts	1.3			—	1.3			—
Derivative liabilities:
Interest rate swap contracts	62.3			—	62.3			—
Risk participation agreements	0.4			—	0.4			—
Deferred compensation plan assets	19.7			—	19.7			—
Deferred compensation plan liabilities	19.7			—	19.7			—

39

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

			Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:
U.S. Treasury notes	$	684.7	$	684.7	$	—	$	—
State, county and municipal securities	$	427.5	$	—	427.5		$	—
Obligations of U.S. government agencies	346.9			—	346.9			—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	2,018.1			—	2,018.1			—
Private mortgage-backed securities	173.4			—	173.4			—
Collateralized loan obligations	899.4			—	899.4			—
Corporate securities	270.5			—	270.5			—
Loans held for sale	30.1			—	30.1			—
Derivative assets:
Interest rate swap contracts	26.3			—	26.3			—
Interest rate lock commitments	1.8			—	1.8			—
Derivative liabilities
Interest rate swap contracts	18.2			—	18.2			—
Deferred compensation plan assets	21.4			—	21.4			—
Deferred compensation plan liabilities	21.4			—	21.4			—

Additionally, from time to time, certain assets are measured at fair value on a non-recurring basis. Adjustments to fair value generally result from the application of lower-of-cost-or-market accounting or write-downs of individual assets due to credit deterioration. The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis:

				Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Collateral dependent loans	$	101.1	$	—	$	—	$	101.1
Other real estate owned	17.5			—		—	17.5
Long-lived assets to be disposed of by sale	1.5			—		—	1.5
				Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Collateral dependent loans	$	11.7	$	—	$	—	$	11.7
Other real estate owned	2.0			—		—	2.0
Long-lived assets to be disposed of by sale	1.3			—		—	1.3

Collateral-dependent Loans. Collateral-dependent loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. The collateral-dependent loans are reported at fair value through specific valuation allowance allocations. In addition, when it is determined that the fair value of a collateral-dependent loan is less than the recorded investment in the loan, the carrying value of the loan is adjusted to fair value through a charge to the allowance for credit losses. Collateral values are estimated using independent appraisals and management estimates of current market conditions. As of March 31, 2022 and December 31, 2021, the Company had collateral-dependent loans with a carrying and fair value of $101.1 million and $11.7 million, respectively.

40

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

OREO. The fair values of OREO are estimated using independent appraisals and management estimates of current market conditions. Upon initial recognition, write-downs based on the foreclosed asset’s fair value at foreclosure are reported through charges to the allowance for credit losses. Periodically, the fair value of foreclosed assets is remeasured with any subsequent write-downs charged to OREO expense in the period in which they are identified. The Company had no material write downs on OREO properties during the three months ended March 31, 2022 and 2021, respectively.

Long-lived Assets to be Disposed of by Sale. Long-lived assets to be disposed of by sale are carried at the lower of carrying value or fair value less estimated costs to sell. The fair values of long-lived assets to be disposed of by sale are based upon observable market data and management estimates of current market conditions. As of March 31, 2022, the Company had long-lived assets to be disposed of by sale with carrying and fair values aggregating $1.5 million, with no write-downs charged to other expense. As of December 31, 2021, the Company had long-lived assets to be disposed of by sale with carrying and fair values aggregating $1.3 million, with no write-downs charged to other expense.         

The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:

	Fair Value As of
	March 31, 2022		December 31, 2021		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Collateral dependent loans	$	101.1	$	11.7	Appraisal	Appraisal adjustment	1%	-	18%	(7%)
Other real estate owned	17.5		2.0		Appraisal	Appraisal adjustment	0%	-	0%	0%
Long-lived assets to be disposed of by sale	1.5		1.3		Appraisal	Appraisal adjustment	0%	-	0%	0%

The Company is required to disclose the fair value of financial instruments for which it is practical to estimate fair value. The methodologies for estimating the fair value of financial instruments that are measured at fair value on a recurring or non-recurring basis are discussed above. The methodologies for estimating the fair value of other financial instruments are discussed below. For financial instruments bearing a variable interest rate where no credit risk exists, it is presumed that recorded book values are reasonable estimates of fair value.        

Financial Assets. Carrying values of cash, cash equivalents, and accrued interest receivable approximate fair values due to the liquid and/or short-term nature of these instruments. Fair values for investment securities held-to-maturity are obtained from an independent pricing service, which considers observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Fair values of fixed rate loans and variable rate loans that reprice on an infrequent basis are estimated by discounting future cash flows using current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality using an exit price notion. Carrying values of variable rate loans that reprice frequently, and with no change in credit risk, approximate the fair values of these instruments.

Financial Liabilities. The fair values of demand deposits, savings accounts, securities sold under repurchase agreements, and accrued interest payable are the amounts that are payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using external market rates that are currently offered for deposits that have similar remaining maturities. The fair values of derivative liabilities are obtained from an independent pricing service, which considers observable data that may include the three-month LIBOR forward curve, the federal funds effective swap rate and cash flows, among other things. The carrying values of the interest-bearing demand notes to the United States Treasury are deemed an approximation of fair values due to the frequent repayment and repricing at market rates. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, notes payable to the FHLB, fixed rate subordinated term debt, and capital lease obligation are estimated by discounting future cash flows using current rates for advances that have similar characteristics.

Commitments to Extend Credit and Standby Letters of Credit. The fair value of commitments to extend credit and standby letters of credit, based on fees currently charged to enter into similar agreements, is not significant.    

41

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

The estimated fair values of financial instruments that are reported in the Company’s consolidated balance sheets, and are segregated by the level of the valuation inputs within the fair value hierarchy that are utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	3,811.3	$	3,811.3	$	3,811.3	$	—	$	—
Securities purchased under agreement to resell	102.0		102.0		—		102.0		—
Investment debt securities available-for-sale	6,283.8		6,283.8		644.9		5,638.9		—
Investment debt securities held-to-maturity	3,218.7		3,029.1		296.2		2,732.9		—
Accrued interest receivable	81.1		81.1		—		81.1		—
Mortgage servicing rights, net	32.7		35.8		—		35.8		—
Loans held for sale	178.1		178.1		—		178.1		—
Net loans held for investment	16,697.8		16,676.6		—		16,575.5		101.1
Derivative assets	26.9		26.9		—		26.9		—
Deferred compensation plan assets	19.7		19.7		—		19.7		—
Total financial assets	$	30,452.1	$	30,244.4	$	4,752.4	$	25,390.9	$	101.1
Financial liabilities:
Total deposits, excluding time deposits	$	26,489.9	$	26,489.9	$	26,489.9	$	—	$	—
Time deposits	1,598.4		1,579.8		—		1,579.8		—
Securities sold under repurchase agreements	1,071.0		1,071.0		—		1,071.0		—
Accrued interest payable	6.0		6.0		—		6.0		—
Long-term debt	120.4		122.8		—		122.8		—
Subordinated debentures held by subsidiary trusts	163.1		162.3		—		162.3		—
Derivative liabilities	62.7		62.7		—		62.7		—
Deferred compensation plan liabilities	19.7		19.7		—		19.7		—
Total financial liabilities	$	29,531.2	$	29,514.2	$	26,489.9	$	3,024.3	$	—

42

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

					Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	2,344.8	$	2,344.8	$	2,344.8	$	—	$	—
Investment debt securities available-for-sale	4,820.5		4,820.5		684.7		4,135.8		—
Investment debt securities held-to-maturity	1,687.6		1,667.5		—		1,667.5		—
Accrued interest receivable	47.4		47.4		—		47.4		—
Mortgage servicing rights, net	28.2		28.2		—		28.2		—
Loans held for sale	30.1		30.1		—		30.1		—
Net loans held for investment	9,209.4		9,254.3		—		9,242.6		11.7
Derivative assets	28.1		28.1		—		28.1		—
Deferred compensation plan assets	21.4		21.4		—		21.4		—
Total financial assets	$	18,217.5	$	18,242.3	$	3,029.5	$	15,201.1	$	11.7
Financial liabilities:
Total deposits, excluding time deposits	$	15,303.1	$	15,303.1	$	15,303.1	$	—	$	—
Time deposits	966.5		963.1		—		963.1		—
Securities sold under repurchase agreements	1,051.1		1,051.1		—		1,051.1		—
Accrued interest payable	3.7		3.7		—		3.7		—
Long-term debt	112.4		120.7		—		120.7		—
Subordinated debentures held by subsidiary trusts	87.0		85.5		—		85.5		—
Derivative liabilities	18.2		18.2		—		18.2		—
Deferred compensation plan liabilities	21.4		21.4		—		21.4		—
Total financial liabilities	$	17,563.4	$	17,566.8	$	15,303.1	$	2,263.7	$	—

(16)    Recent Authoritative Accounting Guidance            

ASU 2020-04, “Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Accounting.” In March 2020, the FASB issued ASU 2020-04, which provides temporary exceptions that are optional for applying GAAP to loan and lease agreements, derivative contracts, and other transactions affected by the anticipated transition away from LIBOR toward new interest rate benchmarks. For transactions that are modified because of reference rate reform and that meet certain scope guidance (i) modifications of loan agreements should be accounted for by prospectively adjusting the effective interest rate, with such modification considered to be "minor" so that any existing unamortized origination fees/costs will carry forward and continue to be amortized and (ii) modifications of lease agreements should be accounted for as a continuation of the existing agreement with no reassessments of the lease classification and the discount rate or remeasurements of lease payments that otherwise would be required for modifications will not be accounted for as separate contracts. ASU 2020-04 is effective March 12, 2020 through December 31, 2022. An entity may elect to apply ASU 2020-04 for contract modifications as of January 1, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. Once elected for a Topic or an Industry Subtopic within the Codification, the amendments in this ASU must be applied prospectively for all eligible contract modifications for that Topic or Industry Subtopic. The Company adopted certain elections related to cash flow hedges which did not have a significant impact on the Company’s financial position or results of operations. The Company is currently evaluating the impact of the adoption of other expedients in the standard and does not anticipate it will have a significant impact on the Company’s financial position or results of operations.

43

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

ASU 2021-01, “Reference Rate Reform (Topic 848)” In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform Topic 848, that clarifies certain exceptions that are optional in Topic 848 for contract modifications and hedge accounting and apply those exceptions to derivatives that are affected by the discounting transition. An entity may elect to apply the amendments in this ASU on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final ASU. If an entity elects to apply any of the amendments in this ASU for an eligible hedging relationship, any adjustments as a result of those elections must be reflected as of the date the entity applies the election. The amendments in this ASU do not apply to contract modifications made, new hedging relationships entered into, or existing hedging relationships evaluated for effectiveness in periods after December 31, 2022, except for hedging relationships existing as of December 31, 2022, that apply certain exceptions that are optional in which the accounting effects of the hedging activity are recorded through the end of the hedging relationship (including periods after December 31, 2022). The Company is currently evaluating the impact of the standard and does not anticipate it will have a significant impact on the Company’s financial position or results of operations.

ASU 2021-08, “Business Combinations (Topic 805), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers” In October 2021, the FASB issued ASU 2021-08, Business Combinations Topic 805, Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, to address diversity in practice and inconsistency related to the accounting for revenue contracts with customers acquired in a business combination. The amendments require that an entity recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606 as if it had originated the contracts. The amendments also provide certain practical expedients for acquirers when recognizing and measuring acquired contract assets and contract liabilities from revenue contracts in a business combination and applies to contract assets and contract liabilities from other contracts to which the provisions of Topic 606 apply. The amendments are effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. Entities should apply the amendments prospectively to business combinations that occur after the effective date. Early adoption is permitted, including in any interim period, for public business entities for periods for which financial statements have not yet been issued, and for all other entities for periods for which financial statements have not yet been made available for issuance. The Company is currently evaluating the impact of the standard and does not anticipate it will have a significant impact on the Company’s financial position or results of operations.

ASU 2022-01, “Derivatives and Hedging (Topic 815), Fair Value Hedging—Portfolio Layer Method” In March 2022, the FASB issued ASU 2022-01, Derivatives and Hedging Topic 815, Fair Value Hedging—Portfolio Layer Method that clarifies the accounting for and promotes consistency in the reporting of hedge basis adjustments applicable to both a single hedged layer and multiple hedged layers. The amendments allow nonprepayable financial assets also to be included in a closed portfolio hedged using the portfolio layer method. That expanded scope permits an entity to apply the same portfolio hedging method to both prepayable and nonprepayable financial assets, thereby allowing consistent accounting for similar hedges. The amendments are effective for fiscal years beginning after December 15, 2022, and interim periods within those fiscal years. Entities should apply the amendments prospectively to business combinations that occur after the effective date. Early adoption in an interim period is permitted for public business entities, with the effect of adopting the amendments related to basis adjustments reflected as of the beginning of the fiscal year of adoption. The Company is currently evaluating the impact of the standard and does not anticipate it will have a significant impact on the Company’s financial position or results of operations.

44

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in millions, except share and per share data)

ASU 2022-02, “Financial Instruments—Credit Losses (Topic 326), Troubled Debt Restructurings and Vintage Disclosures” In March 2022, the FASB issued ASU 2022-02, Financial Instruments—Credit Losses (Topic 326), Troubled Debt Restructurings (TDRs) and Vintage Disclosures that eliminate the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors, while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Rather than applying the recognition and measurement guidance for TDRs, an entity must apply the loan refinancing and restructuring guidance to determine whether a modification results in a new loan or a continuation of an existing loan. The amendment also requires an entity disclose current-period gross writeoffs by year of origination for financing receivables and net investments in leases within the scope of Subtopic 326. The amendments are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Entities should apply the amendments prospectively except for the transition method related to the recognition and measurement of TDRs, an entity has the option to apply a modified retrospective transition method, resulting in a cumulative-effect adjustment to retained earnings in the period of adoption. Early adoption of the amendments are permitted, including adoption in an interim period. If an entity elects to early adopt the amendments in an interim period, the guidance should be applied as of the beginning of the fiscal year that includes the interim period. An entity may elect to early adopt the amendments about TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. The Company is currently evaluating the impact of the standard and does not anticipate it will have a significant impact on the Company’s financial position or results of operations.

(17)    Subsequent Events

Subsequent events have been evaluated for potential recognition and disclosure through the date the Company’s financial statements were filed with the SEC. On April 27, 2022, the Company declared a quarterly dividend to common shareholders of $0.41 per share, to be paid on May 20, 2022 to shareholders of record as of May 10, 2022.

No other undisclosed events requiring recognition or disclosure were identified.

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Item 2.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

When we refer to “we,” “our,” “us,” “First Interstate,” or the “Company” in this report, we mean First Interstate BancSystem, Inc. and our consolidated subsidiaries, including our wholly-owned subsidiary, First Interstate Bank, unless the context indicates that we refer only to the parent company, First Interstate BancSystem, Inc. When we refer to the “Bank” or “FIB” in this report, we mean only First Interstate Bank.

The following discussion of our consolidated financial data reflects our historical results of operations and financial condition and should be read in conjunction with our financial statements and related notes thereto presented elsewhere in this Quarterly Report on Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2021, including the audited financial statements and related notes contained therein, as previously filed with the Securities and Exchange Commission, or SEC.

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

This Quarterly Report on Form 10-Q 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,” “views,” “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 could cause actual results to differ materially from any results, performance or events expressed or implied by such forward-looking statements. A detailed discussion of risks that may cause actual results to differ materially from current expectations in the forward-looking statements is included below in this report under the caption “Risk Factors” and in our Annual Report on Form 10-K for the year ended December 31, 2021, under the captions “Cautionary Note Regarding Forward-Looking Statements” and “Risk Factors”. These factors and the other risk factors described in our periodic and current reports filed with the SEC from time to time, however, are not necessarily all of the important 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. Interested parties are urged to read in their entirety the referenced 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 law. 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.

Executive Overview

We are a financial and bank holding company focused on community banking. Since our incorporation in Montana in 1971, we have grown both organically and through strategic acquisitions. Today, we operate 319 banking offices, including detached drive-up facilities, in communities across fourteen states—Arizona, Colorado, Idaho, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, North Dakota, Oregon, South Dakota, Washington, and Wyoming. Through our bank subsidiary, First Interstate Bank, we deliver a comprehensive range of banking products and services—including online and mobile banking—to individuals, businesses, municipalities, and others throughout our market areas. We are proud to provide lending opportunities to clients that participate in a wide variety of industries, including:

•Agriculture	•Governmental services	•Professional services	•Tourism
•Construction	•Healthcare	•Real Estate Development	•Wholesale trade
•Education	•Hospitality	•Retail
•Energy	•Housing	•Technology

Our principal business activity is lending to, accepting deposits from, and conducting financial transactions with and for individuals, businesses, municipalities, and other entities located in the communities we serve. We derive our income principally from interest charged on loans and, to a lesser extent, from interest and dividends earned on fixed income investments.

46

We also derive income from non-interest sources such as: (i) fees received in connection with various lending and deposit services; (ii) wealth management services, such as trust, employee benefit, investment, and insurance services; (iii) mortgage loan originations, sales and servicing; (iv) merchant and electronic banking services; and (v) from time-to-time, gains on sales of assets and securities.

Our principal expenses include: (i) interest expense on deposits accounts and other borrowings; (ii) salaries and employee benefits; (iii) data processing and communication costs primarily associated with maintaining loan and deposit functions; (iv) furniture, equipment, and occupancy expenses for maintaining our facilities; (v) professional fees, including FDIC insurance assessments; (vi) income tax expense; (vii) provisions for credit losses; (viii) core deposit intangible amortization; and (ix) other real estate owned expenses. We also incur acquisition costs from time to time related to our strategic acquisitions.

Recent Trends and Developments

During the past few years, we have increased our community banking footprint across the Rocky Mountain and Pacific Northwest regions and have expanded into the Midwest and Southwest regions, in large part due to our acquisition activity. We continue to evaluate bank acquisitions and other strategic opportunities on an on-going basis.

On September 15, 2021, the Company entered into a definitive agreement (“Agreement”) to acquire all of the outstanding stock of Great Western Bancorp, Inc. (“Great Western”), the parent company of Great Western Bank (“GWB”), a Sioux Falls, South Dakota based community bank with 174 banking offices across Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota. The acquisition of GWB expanded the Company’s geographical footprint with an enhanced platform for future growth. The acquisition was completed on February 1, 2022. Although legally merged with FIB, the acquired entity will continue to do business as GWB until system conversion, expected to occur in May 2022, at which point GWB’s operations will be integrated with the Company’s operations. The accompanying consolidated statements of (loss) income for the three months ended March 31, 2022, include the results of operations of the acquired entity from the February 1, 2022 acquisition date.

Consideration for the acquisition was $1,723.3 million, consisting of the issuance of 46.9 million shares of the Company’s Class A common stock valued at $36.76 per share, which was the opening price of the Company’s Class A common stock as quoted on the NASDAQ stock market on the acquisition date. Holders of shares of Great Western common stock received 0.8425 shares of First Interstate Class A common stock for each whole share of Great Western common stock and also received cash in lieu of fractional shares. Previously unvested Great Western restricted stock awards that were outstanding immediately prior to the close of the transaction became vested and were considered issued and outstanding at acquisition close and included in consideration. Due to the recent closing of the transaction, all amounts reported related to the assets acquired and liabilities assumed as of the acquisition date are provisional.

Management continues to monitor the impact of COVID-19 on the Company’s financial results. Over the past year, the COVID-19 pandemic has affected our operations to a limited degree, although it has had varying degrees of disruptions and restrictions on our borrowers and to our borrowers’ operations, staffing, and demand for certain products and services.

U.S. inflation data hit a multidecade high in March 2022, climbing to 8.5%, as reported by the Bureau of Labor Statistics. The effect of inflation on the Company differs significantly from the effect on other industries. While our operating expenses, particularly salary and employee benefits, are affected by general inflation, the asset and liability structure of the Company is largely of monetary items. Monetary items, such as cash, investments, loans, deposits and other borrowings, are those assets and liabilities which are or will be converted into a fixed number of dollars regardless of changes in prices. As a result, changes in interest rates have a more significant impact on a financial institution’s performance than does general inflation. Inflation may also have impacts on the Company’s customers, on businesses and consumers and their ability or willingness to invest, save or spend, and perhaps on their ability to repay loans.

The Federal Reserve increased short-term interest rates 25 bps in mid-March 2022. Prior to this, short-term interest rates remained steady since March 2020. With this recent interest rate increase, the short end (up to two years) of the yield curve has begun to steepen. Margins remain depressed from the pressures of a low interest rate environment, though interest income dollars continue to rise on favorable asset volumes.

Gross domestic product declined at a 1.4% annualized rate in the quarter ended March 31, 2022. The negative growth rate for the first quarter of 2022 has been described as unexpected, making it unclear whether the economic performance of the U.S. economy suffered a minor slip from its regular pattern of growth or whether the negative growth is the beginning of an economic slowdown, downturn, or recession; any one of which could impact the Company whether it impacts the level of deposits by our clients, and thus impacts one of our primary lending sources, or causes an increase in credit losses or other expenses.

47

Primary Factors Used in Evaluating Our Business

As a banking institution, we manage and evaluate various aspects of both our financial condition and our results of operations. We monitor our financial condition and performance and evaluate the levels and trends of the line items included in our balance sheet and statements of income, as well as various financial ratios that are commonly used in our industry. We analyze these ratios and financial trends against both our own historical performance and the financial condition and performance of comparable banking institutions in our region and nationally.

As discussed in our Annual Report on Form 10-K for the year ended December 31, 2021, our financial performance is impacted by a number of external factors outside our control, as well as our ability to execute on the key components of our strategy for continued success and future growth. See Part II – Other Information “Item 1A – Risk Factors” for an update of the risk factors disclosed in our Annual Report on Form 10-K for the year ended December 31, 2021.

Critical Accounting Estimates and Significant Accounting Policies

Our consolidated financial statements are prepared in accordance with generally accepted accounting principles (“GAAP”) in the United States and follow general practices within the banking industry. Application of these principles requires management to make estimates, assumptions, and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. The most significant accounting policies we follow are summarized in Note 1 of the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2021, as referenced in Note 1 to the unaudited financial statements in this quarterly report. There have been no material changes in our critical accounting estimates and policies described in our Annual Report on Form 10-K for the year ended December 31, 2021, during the quarterly period covered by this quarterly report.

The preparation of financial statements in conformity with GAAP requires management to measure the company’s financial position and operating results primarily in terms of historic dollars. Changes in the relative value of money due to inflation or recession are generally not considered. The primary effect of inflation on our operations is reflected in increased operating expenses. Management considers changes in interest rates to impact our financial condition and results of operations to a far greater degree than changes in prices due to inflation. Although interest rates are greatly influenced by changes in the inflation rate, they do not necessarily change at the same rate or in the same magnitude as the inflation rate. We manage our interest rate risk in several ways. Refer to “Note – Derivatives and Hedging Activities” in the accompanying “Notes to Unaudited Consolidated Financial Statements” for further discussion on how we manage interest rate risk. There can be no assurance that we will not be materially adversely affected by future changes in interest rates, as interest rates are highly sensitive to many factors that are beyond our control.

Results of Operations

The following discussion and analysis is intended to provide detail about the results of our operations and financial condition.

Net income decreased $84.8 million, or 165.0%, to a net loss of $33.4 million, or $0.36 loss per share during the three months ended March 31, 2022, as compared to net income of $51.4 million, or $0.83 per share for the same period in 2021. The decrease was primarily attributable to acquisition costs associated with the acquisition of Great Western during the quarter ended March 31, 2022.

Net Interest Income

Our operating results depend primarily on our net interest income, which is the difference between the interest the Company earns on its interest-earning assets, such as loans and investment securities, and the expense the Company pays on interest-bearing liabilities, such as deposits and borrowings. Net interest income depends on both the volume of our interest-earning assets and interest-bearing liabilities and the interest rates the Company earns or pays on them.

Changes in interest rate spread, which is the difference between interest earned on assets and interest paid on liabilities, has the most significant impact on net interest income. Other factors like volume of loans, investment securities, and other interest earning assets compared to the volume of interest-bearing deposits and indebtedness also cause changes in our net interest income between periods. Non-interest-bearing sources of funds, such as demand deposits and stockholders’ equity, help to support earning assets.

For the periods indicated, the following table presents condensed average balance sheet information, together with interest income and yields earned on average interest earning assets and interest expense and rates paid on average interest-bearing liabilities.

48

Average Balance Sheets, Yields and Rates	Three Months Ended
(Dollars in millions)	March 31, 2022						March 31, 2021
	Average Balance		Interest		Average Rate		Average Balance		Interest		Average Rate
Interest earning assets:
Loans (1) (2)	$	14,460.6	$	153.0	4.29	%	$	9,873.1	$	108.1	4.44	%
Investment securities (2)	8,279.3		30.9		1.51		4,445.2		17.6		1.61
Interest bearing deposits in banks	3,263.1		1.7		0.21		1,880.5		0.3		0.06
Federal funds sold	0.1		—		—		0.1		—		—
Total interest earning assets	$	26,003.1	$	185.6	2.89	%	$	16,198.9	$	126.0	3.15	%
Non-earning assets	2,492.0						1,692.4
Total assets	$	28,495.1					$	17,891.3
Interest-bearing liabilities:
Demand deposits	$	6,901.8	$	0.9	0.05	%	$	4,177.7	$	0.5	0.05	%
Savings deposits	8,332.7		1.1		0.05		4,531.3		0.3		0.03
Time deposits	1,397.2		1.0		0.29		1,039.3		1.5		0.59
Repurchase agreements	1,077.0		0.3		0.11		1,067.7		0.1		0.04
Long-term debt	127.5		1.7		5.41		112.4		1.5		5.41
Subordinated debentures held by subsidiary trusts	136.9		1.0		2.96		87.0		0.7		3.26
Total interest-bearing liabilities	$	17,973.1	$	6.0	0.14	%	$	11,015.4	$	4.6	0.17	%
Non-interest-bearing deposits	7,211.4						4,704.2
Other non-interest-bearing liabilities	260.5						205.2
Stockholders’ equity	3,050.1						1,966.5
Total liabilities and stockholders’ equity	$	28,495.1					$	17,891.3
Net FTE interest income			$	179.6					$	121.4
Less FTE adjustments (2)			(1.6)						(0.7)
Net interest income from consolidated statements of income			$	178.0					$	120.7
Interest rate spread					2.75	%					2.98	%
Net FTE interest margin (3)					2.80						3.04
Cost of funds, including non-interest-bearing demand deposits (4)					0.10						0.12
(1) Average loan balances include loans held for sale and non-accrual loans. Interest income on loans includes amortization of deferred loan fees net of deferred loan costs of $3.5 million and $10.7 million at March 31, 2022 and March 31, 2021, respectively.
(2) Interest income and average rates for tax exempt loans and securities are presented on a fully taxable equivalent, or FTE, basis utilizing the 21% federal income tax rate.
(3) Net FTE interest margin during the period equals (i) the difference between annualized interest income on interest earning assets and the annualized interest expense on interest bearing liabilities, divided by (ii) average interest earning assets for the period.
(4) Calculated by dividing total annualized interest on interest bearing liabilities by the sum of total interest-bearing liabilities plus non-interest-bearing deposits.

Net interest income increased $57.3 million, or 47.5%, to $178.0 million during the three months ended March 31, 2022, as compared to $120.7 million for the same period in 2021. The increase is a result of the impact of the GWB acquisition, which was partially offset by a decrease of $9.5 million in PPP loan income. The Company earned a total of $2.8 million of interest income, including loan fees, on PPP loans during the three months ended March 31, 2022 as compared to $12.3 million of interest income, including loan fees, on PPP loans for the same period in 2021.

Net interest income included interest accretion related to the fair valuation of acquired loans of $7.6 million during the three months ended March 31, 2022. This compares to interest accretion of $2.3 million during the three months ended March 31, 2021. Interest accretion attributable to the GWB acquisition accounted for $6.0 million during the three months ended March 31, 2022.

Our net FTE interest margin ratio decreased 24 basis points to 2.80% for the three months ended March 31, 2022, as compared to 3.04% for the same period in 2021. The decrease in net FTE interest margin ratio during the three months ended March 31, 2022, as compared to the same period in 2021, was primarily the result of a reduction in yields on earning assets, due to a shift in the mix of earning assets toward investment securities and cash.     

49

Exclusive of the impact of interest accretion on acquired loans and PPP income, our net FTE interest margin ratio was 2.65% during the three months ended March 31, 2022, as compared to 2.81% for the same period in 2021, or a 16 basis point decrease. This decrease was primarily due to a shift in the mix of earning assets toward investment securities that were invested at lower yields, and higher interest-earning cash balances and lower yields on loans excluding PPP balances, which were partially offset by lower deposits costs.

The table below sets forth a summary of the changes in interest income and interest expense resulting from estimated changes in average asset and liability balances (volume) and estimated changes in average interest rates (referred to as “rate”) for the three month period ended March 31, 2022 and 2021. Changes which are not due solely to volume or rate have been allocated to these categories based on the respective percent changes in average volume and average rate as they compare to each other.    

Analysis of Interest Changes Due to Volume and Rates
(Dollars in millions)	Three Months Ended March 31, 2022 compared with Three Months Ended March 31, 2021
	Volume		Rate		Net
Interest earning assets:
Loans (1)	$	50.2	$	(5.3)	$	44.9
Investment securities (1)	15.2		(1.9)		13.3
Interest bearing deposits in banks	0.2		1.2		1.4
Total change	65.6		(6.0)		59.6
Interest bearing liabilities:
Demand deposits	0.3		0.1		0.4
Savings deposits	0.3		0.5		0.8
Time deposits	0.5		(1.0)		(0.5)
Repurchase agreements	—		0.2		0.2
Long-term debt	0.2		—		0.2
Subordinated debentures held by subsidiary trusts	0.4		(0.1)		0.3
Total change	1.7		(0.3)		1.4
Increase (decrease) in FTE net interest income (1)	$	63.9	$	(5.7)	$	58.2

(1)Interest income and average rates for tax exempt loans and securities are presented on a FTE basis.

Provision for (Reversal of) Credit Losses

The Company had a $61.3 million provision for credit losses during the three months ended March 31, 2022, as compared to a reversal of credit losses of $5.1 million during same period in 2021. The provision during the first quarter of 2022 includes $68.3 million related to the acquired non-PCD loans, $2.1 million related to the acquired unfunded commitments, $1.6 million related to the held-to-maturity securities, and a net provision reversal of $10.7 million related primarily to the legacy loan portfolio as a result of sustained improvement in related loan quality indicators. The provision considered the impact of net charge-offs of $16.7 million, or an annualized 0.47% of average loans outstanding, for the first quarter of 2022, compared to $2.9 million, or an annualized 0.12% of average loans outstanding during same period in 2021. During the first quarter of 2022, net charge-offs of $15.4 million was attributable to the loans acquired from GWB in order to facilitate accelerated restructuring of several loans.

For information regarding our non-performing loans, see “Financial Condition – Non-Performing Assets” included herein. For more information on our allowance for credit losses, see “Financial Condition – Allowance for Credit Losses” included herein.             

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Non-interest Income

Non-interest income also contributes to our operating results with our principal sources of non-interest income primarily including fee-based revenues such as payment services, mortgage banking and wealth management revenues, service charges on deposit accounts and other service charges, commissions and fees. The following table presents the composition of our non-interest income as of the dates indicated:

Non-interest income	Three Months Ended March 31,				$ Change		% Change
(Dollars in millions)	2022		2021
Payment services revenues	$	14.8	$	10.2	$	4.6	45.1	%
Mortgage banking revenues	8.4		11.6		(3.2)		(27.6)
Wealth management revenues	8.1		6.3		1.8		28.6
Service charges on deposit accounts	7.7		3.8		3.9		102.6
Other service charges, commissions and fees	4.3		2.1		2.2		104.8
Investment securities gains (losses), net	(0.1)		—		(0.1)		NM
Other income	6.0		4.1		1.9		46.3
Total non-interest income	$	49.2	$	38.1	$	11.1	29.1	%

Total non-interest income increased $11.1 million, or 29.1%, to $49.2 million for the three months ended March 31, 2022, as compared to $38.1 million for the same period in 2021. Significant components of these fluctuations are discussed below.

 Payment services revenues consist of interchange fees that merchants pay for processing electronic payment transactions and ATM service fees. Payment services revenues increased $4.6 million, or 45.1%, to $14.8 million during the three months ended March 31, 2022, as compared to $10.2 million earned during the same period in 2021. The increase in payment services revenues is mainly the result of increased revenue from the GWB acquisition and higher business credit card volume during the three months ended March 31, 2022.

Mortgage banking revenues include gains on residential real estate loans sold, mortgage servicing revenues and direct costs related to loans sold (including amortization, mortgage servicing rights impairment and recoveries and other expenses), and origination and processing fees on residential real estate loans held for sale. Mortgage banking revenues decreased $3.2 million, or 27.6%, to $8.4 million during the three months ended March 31, 2022, as compared to $11.6 million during the same period in 2021. Included in the three months ended March 31, 2022 was a $3.4 million recovery of mortgage servicing rights impairment compared to a $5.9 million recovery of impairment during the same period in 2021. Excluding the impairment recovery in both periods, mortgage banking revenues decreased $0.7 million as a result of lower refinance volumes during the three months ended March 31, 2022.

Wealth management revenues are principally comprised of fees earned for management of trust assets and investment services. Wealth management revenues increased $1.8 million, or 28.6%, to $8.1 million during the three months ended March 31, 2022, as compared to $6.3 million during the same period in 2021, primarily due to the acquisition of GWB.

Service charge fees are primarily driven by service and overdraft charges on deposit accounts. Service charges increased $3.9 million, or 102.6%, to $7.7 million during the three months ended March 31, 2022, as compared to $3.8 million during the same period in 2021, primarily due to the acquisition of GWB.

Other service charges, commissions, and fees primarily include fees earned on certain derivative interest rate contracts, insurance commissions, and safe deposit boxes. Other service charges, commissions, and fees increased $2.2 million, or 104.8%, to $4.3 million during the three months ended March 31, 2022, as compared to $2.1 million during the same period in 2021, primarily due to the acquisition of GWB and increased swap fee revenues earned on derivative interest rate swap contracts offered to clients during the three months ended March 31, 2022.

Other income primarily includes company-owned life insurance revenues, check printing income, agency stock dividends and gains on sales of miscellaneous assets. Other income increased $1.9 million, or 46.3%, to $6.0 million during the three months ended March 31, 2022, as compared to $4.1 million during the same period in 2021, primarily due to a $1.4 million gain on the disposition of the GWB acquired subordinated debt.

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Non-interest Expense

Non-interest expense increased $108.8 million, or 110.6%, to $207.2 million during the three months ended March 31, 2022 as compared to $98.4 million during the same period in 2021, primarily due to $65.2 million in acquisition related costs and an increase in operating expenses as a result of the GWB acquisition. For additional information regarding acquisition related expenses, see “Note 2 – Acquisitions” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

The following table presents the composition of our non-interest expense as of the dates indicated:

Non-interest expense	Three Months Ended March 31,				$ Change		% Change
(Dollars in millions)	2022		2021
Salaries and wages	$	60.0	$	39.0	$	21.0	53.8	%
Employee benefits	21.2		16.1		5.1		31.7
Outsourced technology services	11.3		8.1		3.2		39.5
Occupancy, net	10.0		7.3		2.7		37.0
Furniture and equipment	5.4		4.4		1.0		22.7
OREO expense, net of income	0.1		(0.1)		0.2		—
Professional fees	3.9		3.4		0.5		14.7
FDIC insurance premiums	3.3		1.6		1.7		106.3
Other intangibles amortization	3.6		2.5		1.1		44.0
Other expenses	23.2		16.1		7.1		44.1
Acquisition related expenses	65.2		—		65.2		100.0
Total non-interest expense	$	207.2	$	98.4	$	108.8	110.6	%

Salaries and wages expense increased $21.0 million, or 53.8%, to $60.0 million during the three months ended March 31, 2022, as compared to $39.0 million during the same period in 2021, primarily as a result of the additional employee-related expenses as a result of the acquisition of GWB, which were partially offset by lower commission expenses.

The increases in employee benefits, outsourced technology services, occupancy, net, furniture and equipment, FDIC insurance premiums, and other intangibles amortization expenses are primarily due to increased expenses as a result of the GWB acquisition.

Other expenses primarily include advertising and public relations costs; office supply, postage, freight, telephone, and travel expenses; donations expense; debit and credit card expenses; board of director fees; legal expenses; and other losses. Other expenses increased $7.1 million, or 44.1%, to $23.2 million during the three months ended March 31, 2022, as compared to $16.1 million during the same period in 2021, primarily as a result of the acquisition of GWB in addition to higher donation expenses, and increased new market tax credit amortization during 2022.

Income Tax (Benefit) Expense

Our effective tax rate was 19.1% for the three months ended March 31, 2022 compared to 21.5% for the three months ended March 31, 2021. The change in effective tax rate from an expense to a benefit is primarily as a result of the net loss during the three months ended March 31, 2022, which was partially offset by non-deductible acquisition expenses related to the acquisition of GWB.

Financial Condition        

Total Assets

Total assets increased $13,490.3 million, or 68.6%, to $33,162.2 million as of March 31, 2022, from $19,671.9 million as of December 31, 2021, primarily due to $13,311.8 million of assets acquired in the acquisition of GWB. Significant fluctuations in balance sheet accounts are discussed below. More information regarding the results as of December 31, 2021 can be found in our Annual Report on Form 10-K for the year ended December 31, 2021.

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Loans Held for Sale

Loans held for sale consist of residential mortgage loans pending sale to investors in the secondary market and loans reclassified from loans held for investment due to management’s intent and decision to sell the loans. Loans held for sale increased $148.0 million, or 491.7%, to $178.1 million as of March 31, 2022, compared to $30.1 million as of December 31, 2021, primarily as a result of a reclassification of certain agricultural and commercial loans transferred from loans held for investment to loans held for sale as a result of the GWB acquisition, which was partially offset by a decrease in originations of mortgage loans held for sale.

Loans Held for Investment, Net of Deferred Fees and Costs

Loans held for investment, net of deferred fees and costs, increased $7,613.3 million, or 81.6%, to $16,945.0 million as of March 31, 2022, as compared to $9,331.7 million as of December 31, 2021, primarily due to $7,713.4 million of loans acquired held for investment in the GWB acquisition. Loans held for investment included PPP loans, net of deferred fees, of $56.7 million and $96.3 million as of March 31, 2022 and December 31, 2021, respectively. Excluding the impact of GWB acquired loans and PPP loans, loans held for investment as of March 31, 2022, decreased from December 31, 2021, primarily due to charge-offs and pay downs of GWB acquired loans subsequent to February 1, 2022.

The following table presents the composition and comparison of loans held for investment, including the February 1, 2022 loans acquired from GWB:

									GWB Acquired Loans as of February 1, 2022
	March 31, 2022		December 31, 2021		$ Change		% Change
Real estate loans:
Commercial	$	7,805.7	$	3,971.5	$	3,834.2	96.5	%	$	3,977.1
Construction loans:
Land acquisition & development	344.8		247.8		97.0		39.1		116.4
Residential	406.0		262.0		144.0		55.0		122.1
Commercial	844.8		498.0		346.8		69.6		245.1
Total construction loans	1,595.6		1,007.8		587.8		58.3		483.6
Residential	1,997.5		1,538.2		459.3		29.9		495.0
Agricultural	833.6		213.9		619.7		289.7		631.8
Total real estate loans	12,232.4		6,731.4		5,501.0		81.7		5,587.5
Consumer loans:
Indirect	739.6		737.6		2.0		0.3		13.5
Direct and advance lines	142.5		129.2		13.3		10.3		17.0
Credit card	73.5		64.9		8.6		13.3		11.9
Total consumer loans	955.6		931.7		23.9		2.6		42.4
Commercial	3,017.9		1,475.5		1,542.4		104.5		1,503.2
Agricultural	744.3		203.9		540.4		265.0		580.2
Other, including overdrafts	4.6		1.5		3.1		206.7		—
Deferred loan fees and costs	(9.8)		(12.3)		2.5		(20.3)		—
Loans held for investment, net of deferred loan fees and costs	16,945.0		9,331.7		7,613.3		81.6	%	7,713.3

Non-performing Assets

Non-performing loans. Non-performing loans include non-accrual loans and loans contractually past due 90 days or more and still accruing interest.

Non-accrual loans. We generally place loans on non-accrual status when they become 90 days past due unless they are well secured and in the process of collection. When a loan is placed on non-accrual status, any interest previously accrued but not collected is reversed from income. Non-accrual loans increased approximately $94.0 million, or 377.5%, to $118.9 million, as of March 31, 2022, from $24.9 million as of December 31, 2021, primarily as a result of the GWB acquisition. Non-accrual loans acquired from GWB totaled $100.7 million as of March 31, 2022.

Accruing loans past due 90 days or more decreased $0.1 million, or 3.6%.

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The following table sets forth the allocation of our non-performing loans among our various loan categories as of the dates indicated.

Non-Performing Loans by Loan Type
(Dollars in millions)	March 31, 2022		Percent of Total		December 31, 2021		Percent of Total
Real estate:
Commercial	$	37.7	31.0	%	$	8.6	31.1	%
Construction:
Land acquisition and development	3.9		3.2		0.7		2.5
Total construction	3.9		3.2		0.7		2.5
Residential	7.2		5.9		3.0		10.8
Agricultural	38.8		31.9		4.9		17.7
Total real estate	87.6		72.0		17.2		62.1
Consumer	2.5		2.1		2.8		10.1
Commercial	16.5		13.6		6.1		22.0
Agricultural	15.0		12.3		1.6		5.8
Total non-performing loans	$	121.6	100.0	%	$	27.7	100.0	%

Non-performing assets. Non-performing assets include non-performing loans and OREO. The following table sets forth information regarding non-performing assets as of the dates indicated.

Other real estate owned increased $15.5 million, or 775.0%, from December 31, 2021, primarily attributable to the $15.8 million of provisional other real estate owned acquired in the GWB acquisition.

Non-Performing Assets and Troubled Debt Restructurings
(Dollars in millions)	March 31, 2022			December 31, 2021			September 30, 2021			June 30, 2021			March 31, 2021
Non-performing loans:
Non-accrual loans	$	118.9		$	24.9		$	29.9		$	30.4		$	37.0
Accruing loans past due 90 days or more	2.7			2.8			5.2			5.2			4.4
Total non-performing loans	121.6			27.7			35.1			35.6			41.4
OREO	17.5			2.0			2.3			2.0			2.2
Total non-performing assets	$	139.1		$	29.7		$	37.4		$	37.6		$	43.6
Troubled debt restructurings not included above (1)	$	14.7		$	2.3		$	2.1		$	2.2		$	3.1
Non-accrual loans to loans held for investment	0.70		%	0.27		%	0.31		%	0.31		%	0.38		%
Non-performing loans to loans held for investment	0.72			0.30			0.36			0.36			0.42
Non-performing assets to loans held for investment and OREO	0.82			0.32			0.39			0.38			0.44
Non-performing assets to total assets	0.42			0.15			0.19			0.20			0.24

(1) Accruing loans modified in trouble debt restructurings are not considered non-performing loans as the loans are performing as agreed under their modified terms and management expects performance to continue.

Allowance for Credit Losses

The Company performs a quarterly assessment of the adequacy of its allowance for credit losses in accordance with GAAP. The methodology used to assess the adequacy is consistently applied to the Company’s loans held for investment portfolio. The allowance for credit losses is established through a provision for credit losses based on our evaluation of quantitative and qualitative risk factors in our loan portfolio at each balance sheet date. In determining the allowance for credit losses, we estimate losses on specific loans, or groups of loans, where the expected loss can be identified and reasonably determined. The balance of the allowance for credit losses is based on internally assigned risk classifications of loans, historical loan loss rates, changes in the nature or tenure of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, current environmental and economic factors, and the estimated impact of current and forecasted economic conditions on certain historical loan loss rates.    

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The allowance for credit losses is increased by provisions charged against earnings and net recoveries of charged-off loans and is reduced by negative provisions credited to earnings and net loan charge-offs. The allowance for credit losses consists of three elements:    

(1)Specific valuation allowances associated with collateral-dependent loans which are determined based on assessment of the fair value of the collateral underlying the loans as determined through independent appraisals, the present value of future cash flows, observable market prices, and any relevant qualitative or environmental factors impacting loans.

(2)Historical valuation allowances based on loan loss experience for similar loans with similar characteristics and trends. The Company applies probability of default and loss given default methodologies for all portfolio segments. The Company uses a transition matrix for probability of default components of the methodology and a historical average for the loss given default components of the methodology. The probability of default and loss given default is applied to the current principal balance as of the reporting date. The transition matrix determines the probability of default by tracking the historical movement of loans between loan risk tiers over a defined period of time. Loan transitions are measured by either internal ratings or delinquency status. Those loans tracked by ratings are generally commercial purpose including agricultural, commercial, and commercial real estate. Those loans tracked by delinquency are generally consumer in nature, with the exception of multi-family and credit cards. The loss given default used as the basis for the estimate of credit losses is comprised of the Company’s historical loss experiences from 2008 to the current period, based on a migration analysis of our historical loss experience, which is designed to account for credit deterioration. The model compares the most recent period losses to prior period defaults to calculate the loss given default, which is averaged over the historical observations.

(3)Qualitative allowances determined based on changes in the nature of the loan portfolio, overall portfolio quality, industry concentrations, delinquency trends, general economic conditions or forecasts, and other qualitative risk factors, both internal and external to us, including the incorporation of a one-year forecast period for economic conditions.     

As part of the qualitative adjustments, the Company considers future economic conditions over the one year forecast period. There are 10 economic factors that are considered in our assessment which are compared against the Moody’s Analytics economic scenarios. The outcome of this analysis adjusts the one-year forecasted expectations which are incorporated into the qualitative adjustments. Other qualitative factors, including changes in loan and lending policies, underwriting standards and personnel, and assessments of portfolio loan quality, among others, are also considered. During the period ending March 31, 2022, other qualitative factors were adjusted based on our assessment of loan quality and sustained loan quality trends in certain loan categories..

Based on the assessment of the adequacy of the allowance for credit losses, the Company records provisions for credit losses to maintain the allowance for credit losses at appropriate levels.    

Loans acquired in business combinations are initially recorded at fair value as adjusted for credit risk and an allowance for credit losses at the date of acquisition. For loans with no significant evidence of credit deterioration since origination, the difference between the fair value and the unpaid principal balance of the loan at the acquisition date is amortized into interest income using the effective interest method over the remaining period to contractual maturity. An allowance for credit loss is recorded for the expected credit losses over the life of the loan on loans acquired without evidence of credit deterioration. The Company established an allowance for credit losses and recorded a provision of $68.3 million on GWB non-PCD loans acquired. Subsequent changes to the allowance for credit losses are recorded through provision expense using the same methodology as other loans held for investment.

For loans acquired in business combinations with evidence of deterioration in credit quality since origination, the Company determines the fair value of the loans by estimating the amount and timing of principal and interest cash flows initially expected to be collected on the loans and discounting those cash flows at an appropriate market rate of interest. An allowance for credit losses is recognized by estimating the expected credit losses of the purchased asset and recording an adjustment to the acquisition date fair value to establish the initial amortized cost basis of the asset. The Company established an allowance for credit losses and recorded a provision of $84.3 million on GWB PCD loans acquired. Differences between the established amortized cost basis, and the unpaid principal balance of the asset, is considered to be a non-credit discount/premium and is accreted/amortized into interest income using the level yield interest method. The difference between the amortized cost basis and the unpaid principal balance of $31.2 million was established on GWB PCD loans acquired. Subsequent changes to the allowance for credit losses are recorded through provision expense using the same methodology as other loans held for investment.

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Loans, or portions thereof, are charged-off against the allowance for credit losses when management believes the collectability of the principal is unlikely, or, with respect to consumer installment loans, according to an established delinquency schedule. Generally, loans are charged-off when (1) there has been no material principal reduction within the previous 90 days and there is no pending sale of collateral or other assets, (2) there is no significant or pending event which will result in principal reduction within the upcoming 90 days, (3) it is clear that we will not be able to collect all or a portion of the loan, (4) payments on the loan are sporadic, will result in an excessive amortization, or are not consistent with the collateral held, or (5) foreclosure or repossession actions are pending. Loan charge-offs do not directly correspond with the receipt of independent appraisals or the use of observable market data if the collateral value is determined to be sufficient to repay the principal balance of the loan.

If a collateral-dependent loan is adequately collateralized, a specific valuation allowance is not recorded. As such, significant changes in collateral-dependent and non-performing loans do not necessarily correspond proportionally with changes in the specific valuation component of the allowance for credit losses. Additionally, the Company expects the timing of charge-offs will vary between quarters and will not necessarily correspond proportionally to changes in the allowance for credit losses or changes in non-performing or collateral dependent loans due to timing differences among the initial identification of a collateral-dependent loan, recording of a specific valuation allowance for collateral-dependent loans, and any resulting charge-off of uncollectible principal.

Our allowance for credit losses on loans was $247.2 million, or 1.46% of loans held for investment as of March 31, 2022, including PPP loans, as compared to $122.3 million, or 1.31% of loans held for investment, as of December 31, 2021. The increase in the percentage from December 31, 2021 is primarily a result of GWB acquired loans, which included a higher percentage of criticized assets than the Company’s legacy loans. The allowance for credit losses represents management’s estimate of expected credit losses in the loan portfolio expected over the life of the loan, including the incorporation of a one-year forecast period for economic conditions.

Although we have established our allowance for credit losses in accordance with GAAP in the United States and we believe that the allowance for credit losses is adequate to provide for known and inherent losses in the portfolio at all times, future provisions will be subject to on-going evaluations of the risks in the loan portfolio. If the economy declines or asset quality deteriorates, material additional provisions could be required.

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The following table sets forth information regarding our allowance for credit losses as of and for the periods indicated:

Allowance for Credit Losses	Three Months Ended
(Dollars in millions)	Mar 31, 2022			Dec 31, 2021			Sep 30, 2021			Jun 30, 2021			Mar 31, 2021
Allowance for credit losses on loans:
Beginning balance	$	122.3		$	135.1		$	135.5		$	136.6		$	144.3
Initial ACL recorded on PCD loans	84.3			—			—			—			—
Provision for (reversal of) credit losses	57.3			(10.1)			0.2			—			(4.8)
Charge offs:
Real estate
Commercial	5.1			—			—			2.2			0.1
Construction	2.7			1.1			—			0.3			—
Residential	0.1			—			—			—			0.1
Agricultural	5.2			0.7			—			—			—
Consumer	2.3			1.9			2.0			1.6			2.7
Commercial	4.3			1.1			0.1			0.5			2.0
Agricultural	0.2			—			—			0.2			—
Total charge-offs	19.9			4.8			2.1			4.8			4.9
Recoveries:
Real estate
Commercial	—			—			—			0.1			—
Construction	0.1			—			0.1			0.3			0.2
Residential	0.2			—			0.1			0.1			0.1
Consumer	1.4			1.1			1.1			1.2			1.1
Commercial	0.4			1.0			0.2			2.0			0.6
Agricultural	1.1			—			—			—			—
Total recoveries	3.2			2.1			1.5			3.7			2.0
Net charge-offs	16.7			2.7			0.6			1.1			2.9
Ending balance	$	247.2		$	122.3		$	135.1		$	135.5		$	136.6
Allowance for off-balance sheet credit losses:
Beginning balance	$	3.8		$	3.2		$	3.4		$	3.4		$	3.7
Provision for (reversal of) credit losses	2.4			0.6			(0.2)			—			(0.3)
Ending balance	$	6.2		$	3.8		$	3.2		$	3.4		$	3.4
Allowance for credit losses on investment securities:
Beginning balance	$	—		$	—		$	—		$	—		$	—
Provision for credit losses	1.6			—			—			—			—
Ending balance	$	1.6		$	—		$	—		$	—		$	—
Total allowance for credit losses	$	255.0		$	126.1		$	138.3		$	138.9		$	140.0
Total provision for (reversal of) credit losses	61.3			(9.5)			—			—			(5.1)
Loans held for investment	16,945.0			9,331.7			9,622.5			9,834.7			9,863.2
Average loans	14,460.6			9,512.3			9,805.2			9,969.2			9,873.1
Net loans charged-off to average loans, annualized	0.47		%	0.11		%	0.02		%	0.04		%	0.12		%
Allowance to non-accrual loans	207.91			491.16			451.84			445.72			369.19
Allowance to loans held for investment	1.46			1.31			1.40			1.38			1.38

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Investment Securities

We manage our investment portfolio to obtain the highest yield possible, while meeting our risk tolerance and liquidity guidelines and satisfying the pledging requirements for deposits of state and political subdivisions and securities sold under repurchase agreements. Our portfolio principally comprises U.S. treasuries, U.S. government agency residential and commercial mortgage-backed securities and collateralized mortgage obligations, U.S. government agency, corporate securities, and tax-exempt securities. Federal funds sold and interest-bearing deposits in the Bank are additional investments that are classified as cash equivalents rather than as investment securities. Investment securities classified as available-for-sale are recorded at fair value, while investment securities classified as held-to-maturity are recorded at amortized cost. Unrealized gains or losses, net of the deferred tax effect, on available-for-sale securities are reported as increases or decreases in accumulated other comprehensive income or loss, a component of stockholders’ equity.

Investment securities increased $2,994.4 million, or 46.0%, to $9,502.5 million as of March 31, 2022, from $6,508.1 million as of December 31, 2021. The increase was primarily due to $2,699.0 million of securities acquired in the GWB acquisition. In conjunction with the acquisition of GWB, the Company transferred debt securities categorized as held-to-maturity with an estimated fair value of $10.9 million to the available-for-sale category classification and transferred debt securities categorized as available-for-sale with an estimated fair value of $463.6 million to the held-to-maturity classification.

As of March 31, 2022, the estimated duration of our investment portfolio was 3.8 years, as compared to 3.6 years as of December 31, 2021.

As of March 31, 2022, we had $247.9 million of investment securities that had been in a continuous loss position for more than twelve months. At March 31, 2022, the Company has an allowance for credit losses on held-to maturity securities classified as corporate and municipal securities of $1.6 million. There was no allowance for credit losses on held-to-maturity securities at December 31, 2021.

Goodwill

Goodwill increased $516.0 million, or 83.0%, to $1,137.6 million as of March 31, 2022, from $621.6 million as of December 31, 2021, attributable to the provisional goodwill recorded in conjunction with the acquisition of GWB.

Company-Owned Life Insurance

Company-owned life insurance increased $188.6 million, or 62.6%, to $490.1 million as of March 31, 2022, from $301.5 million as of December 31, 2021, attributable to provisional amounts recorded in conjunction with the acquisition of GWB.

Other Intangibles, Net of Accumulated Amortization

Other intangibles, net of accumulated amortization, increased $68.3 million, or 165.4%, to $109.6 million as of March 31, 2022, from $41.3 million as of December 31, 2021, attributable to provisional core deposit intangibles of $49.1 million and other customer relationship intangibles of $22.8 million recorded in conjunction with the acquisition of GWB offset by amortization expense.

Premises and equipment

Premises and equipment, net of accumulated depreciation increased $144.8 million, or 48.3%, to $444.4 million as of March 31, 2022, from $299.6 million as of December 31, 2021, attributable to provisional amounts recorded in conjunction with the acquisition of GWB offset by depreciation expense.

Total Liabilities

Total liabilities increased $12,035.8 million, or 68.1%, to $29,721.1 million as of March 31, 2022, from $17,685.3 million as of December 31, 2021, primarily due to $12,104.5 million of liabilities assumed with the acquisition of GWB, which was partially offset by the redemption of the subordinated debt and payoff of the FHLB advances assumed with the acquisition of GWB. Significant fluctuations in liability accounts are discussed below.

58

Deposits

Our deposits consist of non-interest-bearing and interest-bearing demand, savings, individual retirement, and time deposit accounts. Total deposits increased $11,818.7 million, or 72.6%, to $28,088.3 million as of March 31, 2022, from $16,269.6 million as of December 31, 2021, primarily due to $11,688.0 million in deposits acquired as a result of the GWB acquisition and organic increases in interest-bearing demand and non-interest bearing business deposits. These increases were partially offset by decreases in savings deposits and interest-bearing time deposits. Exclusive of $11,682.6 million of deposits acquired as a result of the GWB acquisition, deposits grew $136.1 million, or 0.84%, compared to December 31, 2021.

The following table summarizes our deposits as of the dates indicated:

Deposits
(Dollars in millions)	March 31, 2022		Percent of Total		December 31, 2021		Percent of Total
Non-interest-bearing demand	$	8,240.6	29.3	%	$	5,568.3	34.2	%
Interest bearing:
Demand	8,245.0		29.4		4,753.2		29.2
Savings	10,004.3		35.6		4,981.6		30.6
Time, $250 and over	359.8		1.3		186.7		1.2
Time, other (1)	1,238.6		4.4		779.8		4.8
Total interest bearing	19,847.7		70.7		10,701.3		65.8
Total deposits	$	28,088.3	100.0	%	$	16,269.6	100.0	%

(1)Included in “Time, other” are Certificate of Deposit Account Registry Service, or CDARS, deposits of $107.9 million and $104.5 million as of March 31, 2022 and December 31, 2021, respectively.

Securities Sold Under Repurchase Agreements

In addition to deposits, repurchase agreements with commercial depositors, which include municipalities, provide an additional source of funds. Under repurchase agreements, deposit balances are invested in short-term U.S. government agency securities overnight and are then repurchased the following day. All outstanding repurchase agreements are due in one day and balances fluctuate in the normal course of business. Repurchase agreement balances decreased $19.9 million, or 1.9%, to $1,071.0 million as of March 31, 2022, from $1,051.1 million as of December 31, 2021. Exclusive of $74.0 million in securities sold under repurchase agreements acquired from GWB, securities sold under repurchase agreements decreased $54.1 million, or 5.1% from December 31, 2021. Fluctuations in repurchase agreement balances correspond with fluctuations in the liquidity of the Company’s clients.

Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses increased $117.7 million, or 79.3%, to $266.1 million as of March 31, 2022, from $148.4 million as of December 31, 2021, attributable to provisional amounts recorded in conjunction with the acquisition of GWB.

Subordinated debentures held by subsidiary trusts

Subordinated debentures held by subsidiary trusts increased $76.1 million, or 87.5%, to $163.1 million as of March 31, 2022, from $87.0 million as of December 31, 2021, primarily attributable to provisional amounts recorded in conjunction with the acquisition of GWB.

Deferred Tax Asset / Liability

As of March 31, 2022, we had a net deferred tax asset of $137.4 million, as compared to a net deferred tax liability of $9.3 million as of December 31, 2021, primarily due to the provisional net deferred tax asset benefit recorded in conjunction with the acquisition of GWB and the increase in our mark-to-market losses on investment securities.

59

Capital Resources and Liquidity Management

Stockholders’ equity is influenced primarily by earnings, dividends, sales and redemptions of common stock, and changes in the unrealized holding gains or losses, net of taxes, on available-for-sale investment securities. Stockholders’ equity increased $1,454.5 million, or 73.2%, to $3,441.1 million as of March 31, 2022, from $1,986.6 million as of December 31, 2021, due to the issuance of additional Class A common stock as consideration for the acquisition of GWB and proceeds from stock option exercises, which are partially offset by a net loss, stock repurchases of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants, other comprehensive loss, and cash dividends paid.

On April 27, 2022, the Company’s board of directors declared a dividend of $0.41 per common share, payable on May 20, 2022, to common stockholders of record as of May 10, 2022. The dividend equates to a 4.2% annual yield based on the $39.40 average closing pricing of the Company’s common stock during the first quarter of 2022.

On June 11, 2019, the Company’s board of directors adopted a stock repurchase program where the Company may repurchase up to 2.5 million of its outstanding shares of Class A common stock. On September 12, 2020, the Company’s board of directors increased the number of shares of Class A common stock authorized to be repurchased by the Company under the stock repurchase program by an additional 3.0 million shares for a total of 5.5 million shares.

During the three months ended March 31, 2022, the Company did not repurchase shares of our Class A common stock under the stock repurchase program. As of March 31, 2022, there were 1.9 million shares remaining authorized under the repurchase program.

As a bank holding company, the Company must comply with the capital requirements established by the Federal Reserve, and our subsidiary Bank must comply with the capital requirements established by the FDIC. The current risk-based guidelines applicable to us and our Bank are based on the Basel III framework, as implemented by the federal bank regulators. As of March 31, 2022 and December 31, 2021, the Company had capital levels that, in all cases, exceeded the guidelines to be deemed “well-capitalized.” For additional information regarding our capital levels, see “Note – Regulatory Capital” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report.

Liquidity. Liquidity measures our ability to meet current and future cash flow needs on a timely basis and at a reasonable cost. We manage our liquidity position to meet the daily cash flow needs of clients, while maintaining an appropriate balance between assets and liabilities to meet the return-on-investment objectives of our shareholders. Our liquidity position is supported by management of liquid assets and liabilities and access to alternative sources of funds. Liquid assets include cash, interest bearing deposits in banks, federal funds sold, available-for-sale investment securities, and maturing or prepaying balances in our held-to-maturity investment and loan portfolios. Liquid liabilities include core deposits, federal funds purchased, securities sold under repurchase agreements, and borrowings. Other sources of liquidity include the sale of loans, the ability to acquire additional national market funds through non-core deposits, the issuance of additional collateralized borrowings such as FHLB advances, the issuance of debt securities, additional borrowings through the Federal Reserve’s discount window, and the issuance of preferred or common securities.

Our short-term and long-term liquidity requirements are primarily to fund on-going operations, including payment of interest on deposits and debt, extensions of credit to borrowers, capital expenditures, and shareholder dividends. These liquidity requirements are met primarily through cash flow from operations, redeployment of prepaying and maturing balances in our loan and investment portfolios, debt financing, and increases in client deposits. For additional information regarding our operating, investing, and financing cash flows, see the unaudited “Consolidated Statements of Cash Flows,” included in Part I, Item 1.    

As a holding company, we are a corporation separate and apart from our subsidiary Bank and, therefore, we provide for our own liquidity. Our primary sources of funding include management fees and dividends declared and paid by the Bank and access to capital markets. There are statutory, regulatory, and debt covenant limitations that affect the ability of our Bank to pay dividends to us. Management believes that such limitations will not impact our ability to meet our ongoing short-term cash obligations.    

The Company continuously monitors our liquidity position and adjustments are made to the balance between sources and uses of funds as deemed appropriate. We are not aware of any events that are reasonably likely to have a material adverse effect on our liquidity, capital resources, or operations. In addition, we are not aware of any regulatory recommendations regarding liquidity, which if implemented, would have a material adverse effect on us.

60

Recent Accounting Pronouncements    

See “Note – Recent Authoritative Accounting Guidance” in the accompanying “Notes to Unaudited Consolidated Financial Statements” included in this report for details of recently issued accounting pronouncements and their expected impact on our financial statements.        

Item 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES

ABOUT MARKET RISK

As of March 31, 2022, there have been no material changes in the quantitative and qualitative information about market risk provided pursuant to Item 305 of Regulation S-K as presented in our Annual Report on Form 10-K for the year ended December 31, 2021.

Item 4.

CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management is responsible for establishing and maintaining effective disclosure controls and procedures, as defined under Rules 13a-15(e) and 15d-15(e) of the Exchange Act. As of March 31, 2022, an evaluation was performed, under the supervision and with the participation of management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of March 31, 2022 were effective in ensuring that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods required by the SEC’s rules and forms, and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting for the quarter ended March 31, 2022 that have materially affected, or are reasonably likely to materially affect, such control.

Limitations on Controls and Procedures

The effectiveness of our disclosure controls and procedures and our internal control over financial reporting is subject to various inherent limitations, including cost limitations, judgments used in decision making, assumptions about the likelihood of future events, the soundness of our systems, the possibility of human error, and the risk of fraud. Moreover, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions and the risk that the degree of compliance with policies or procedures may deteriorate over time. Because of these limitations, any system of disclosure controls and procedures or internal control over financial reporting may not be successful in preventing all errors or fraud or in making all material information known in a timely manner to the appropriate levels of management.

PART II.

OTHER INFORMATION

Item 1.    Legal Proceedings

The Company is involved in various claims, legal actions, and complaints which arise in the ordinary course of business. In the Company’s opinion, all such matters are adequately covered by insurance, are without merit or are of such kind, or involve such amounts, that unfavorable disposition would not have a material adverse effect on the financial condition or results of operations of the Company.

Item 1A.    Risk Factors

There have been no material changes in risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2021 during the period covered by this quarterly report.

61

Item 2.    Unregistered Sales of Equity Securities and Use of Proceeds

(a) There were no unregistered sales of equity securities during the three months ended March 31, 2022.

(b) Not applicable.

(c) The following table provides information with respect to purchases made of our Class A common stock by or on behalf of us or any “affiliated purchasers” (as defined in Rule 10b-18(a)(3) under the Exchange Act), during the three months ended March 31, 2022. 

				Total Number of	Maximum Number
				Shares Purchased as Part	of Shares That May
	Total Number of	Average Price		of Publicly Announced	Yet Be Purchased Under
Period	Shares Purchased (1)	Paid Per Share		Plans or Programs	the Plans or Programs
January 2022	—	$	—	—	1,889,158
February 2022	20,613	38.09		—	1,889,158
March 2022	17,085	39.25		—	1,889,158
Total	37,698	$	38.62	—	1,889,158

(1)    Stock repurchases were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants of the Company’s 2015 Equity Compensation Plan.

Item 3.    Defaults upon Senior Securities

None.

Item 4.    Mine Safety Disclosures

Not applicable.

Item 5.    Other Information

None.

62

Item 6.    Exhibits

Exhibit Number		Description
3.1		First Amendment to the Third Amended and Restated Articles of Incorporation of the Company (incorporated herein by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, File No. 001-34653, filed on January 20, 2022)
3.2		Second Amendment to the Third Amended and Restated Articles of Incorporation of First Interstate BancSystem, Inc. (incorporated herein by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, File No. 001-34653, filed on February 1, 2022)
3.3		First Amendment to the Fourth Amended and Restated Bylaws of the Company (incorporated herein by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K, File No. 001-34653, filed on February 1, 2022)
4.1*		Description of the Company’s securities registered under Section 12 of the Securities Exchange Act of 1934, as amended
10.1		First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan Form of Time Restricted Stock Grant Agreement (incorporated herein by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K, File No. 001-34653, filed on March 21, 2022)
10.2		First Interstate BancSystem, Inc. 2015 Equity and Incentive Plan Form of Performance Restricted Stock Grant Agreement (incorporated herein by reference to Exhibit 99.2 to the Company’s Current Report on Form 8-K, File No. 001-34653, filed on March 21, 2022)
31.1*		Certification by Chief Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) under the Securities Exchange Act of 1934, as amended
31.2*		Certification by Chief Financial Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) under the Securities Exchange Act of 1934, as amended
32**		18 U.S.C. Section 1350 Certifications.
101*		Interactive Data File - The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document.
104*		Cover Page Interactive Data File - The cover page XBRL tags are embedded within the inline XBRL document (included in Exhibit 101)
*	Filed herewith.
**	Furnished herewith.

63

SIGNATURES

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

		FIRST INTERSTATE BANCSYSTEM, INC.
Date:	May 9, 2022	By:	/S/  KEVIN P. RILEY
			Kevin P. Riley President and Chief Executive Officer
Date:	May 9, 2022	By:	/S/  MARCY D. MUTCH
			Marcy D. Mutch Executive Vice President and Chief Financial Officer

64

EX-4.1

Exhibit 4.1

DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT

Description of Our Capital Stock

Our articles of incorporation, as amended, provide for authorized shares of Class A common stock, Class B common stock, and preferred stock. There are no shares of Class B common stock or preferred stock currently outstanding. Our common stock is uncertificated.

Our authorized capital stock consists of 250,100,000 shares, each with no par value per share, of which:

•150,000,000 shares are designated as Class A common stock;

•100,000,000 shares are designated as Class B common stock; and

•100,000 shares are designated as preferred stock.

Preferred Stock

Our Board of Directors, or Board, is authorized, without approval of the holders of Class A common stock, to provide for the issuance of preferred stock from time-to-time in one or more series in such number and with such designations, preferences, powers, and other special rights as may be stated in the resolution or resolutions providing for such preferred stock. Our Board may cause us to issue preferred stock with voting, conversion, and other rights that could be senior or in preference to the rights of the holders of Class A common stock.

Class A Common Stock

The holders of our Class A common stock are entitled to one vote per share on any matter to be voted upon by the shareholders. The holders of Class A common stock are not entitled to cumulative voting rights with respect to the election of directors, which means that the holders of a majority of the shares voted can elect all of the directors then standing for election. Directors are elected by a majority of the voting power of the shares of Class A common stock present in person or represented by proxy and entitled to vote on the election of directors at a shareholder meeting called for the purpose.

The holders of our Class A common stock are entitled to share equally in any dividends that our Board may declare from time-to-time from legally available funds and assets, subject to limitations under Montana law and the preferential rights of holders of any outstanding shares of preferred stock. If a dividend is paid in the form of shares of Class A common stock or rights to acquire shares of Class A common stock, the holders of Class A common stock will be entitled to receive Class A common stock, or rights to acquire Class A common stock, as the case may be.

Upon any voluntary or involuntary liquidation, dissolution, distribution of assets, or winding up of our Company, the holders of our Class A common stock are entitled to share equally, on a per share basis, in all our assets available for distribution, after payment to creditors and subject to any prior distribution rights granted to holders of any outstanding shares of preferred stock. Our Class A common stock is not convertible into any other shares of our capital stock. Holders of Class A common stock do not have any preemptive rights.

Anti-Take Over Provisions

Our articles of incorporation, as amended, provide that our Board may issue up to 100,000 shares of preferred stock, in one or more series, without shareholder approval and with such terms, conditions, rights, privileges, and preferences as the Board may deem appropriate. In addition, our articles of incorporation, as amended, provide for staggered terms for our Board and limitations on persons authorized to call a special meeting of shareholders. In addition, certain provisions of Montana law may have the effect of inhibiting a third party from making a proposal to acquire us or of impeding a change of control under circumstances that otherwise could provide the holders of our Class A common stock with the opportunity to realize a premium over the then-prevailing market price of such Class A common stock.

EX-31.1

Exhibit 31.1

CERTIFICATION BY CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a) AND RULE 15d-14(a)

UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Kevin P. Riley, certify that :

1.I have reviewed this quarterly report on Form 10-Q of First Interstate BancSystem, Inc.

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes, in accordance with generally accepted accounting principles;

c.evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions);

a.all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

DATE: May 9, 2022

/s/ KEVIN P. RILEY

Kevin P. Riley

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION BY CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(a) AND RULE 15d-14(a)

UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Marcy D. Mutch, certify that :

1.I have reviewed this quarterly report on Form 10-Q of First Interstate BancSystem, Inc;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes, in accordance with generally accepted accounting principles;

c.evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions);

a.all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

DATE: May 9, 2022

/s/ MARCY D. MUTCH

Marcy D. Mutch

Executive Vice President and Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

The undersigned are the Chief Executive Officer and the Chief Financial Officer of First Interstate BancSystem, Inc. (the “Registrant”). This Certification is made pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. This Certification accompanies the Quarterly Report on Form 10-Q of the Registrant for the quarter ended March 31, 2022.

We certify that, based on our knowledge, such Quarterly Report on Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

This Certification is executed as of May 9, 2022.

/s/ KEVIN P. RILEY

Kevin P. Riley

President and Chief Executive Officer

/s/ MARCY D. MUTCH

Marcy D. Mutch

Executive Vice President and Chief Financial Officer

XML

Cover Page - shares	3 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-34653
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM, INC.
Entity Incorporation, State or Country Code	MT
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	59116-0918
City Area Code	406
Local Phone Number	255-5311
Title of 12(b) Security	Class A common stock, no par value
Trading Symbol	FIBK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		109,493,618
Amendment Flag	false
Entity Central Index Key	0000860413
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 387.6	$ 168.6
Interest bearing deposits in banks	3,423.6	2,176.1
Federal funds sold	0.1	0.1
Total cash and cash equivalents	3,811.3	2,344.8
Securities Purchased under Agreements to Resell	102.0	0.0
Investment securities:
Available-for-sale, at estimated fair value	6,283.8	4,820.5
Held-to-maturity, net of allowance for credit losses of $1.6 and $0 at March 31, 2022 and December 31, 2021 (estimated fair values of $3,029.1 and $1,667.5 at March 31, 2022 and December 31, 2021)	3,218.7	1,687.6
Total investment securities	9,502.5	6,508.1
Loans held for sale	178.1	30.1
Loans held for investment, net of deferred fees and costs	16,945.0	9,331.7
Allowance for credit losses	247.2	122.3
Net loans held for investment	16,697.8	9,209.4
Goodwill	1,137.6	621.6
Bank Owned Life Insurance	490.1	301.5
Premises and equipment, net of accumulated depreciation	444.4	299.6
Other intangibles, net of accumulated amortization	109.6	41.3
Accrued interest receivable	81.1	47.4
Mortgage servicing rights, net of accumulated amortization and impairment reserve	32.7	28.2
Other real estate owned	17.5	2.0
Deferred tax assets	137.4	0.0
Other assets	420.1	237.9
Total assets	33,162.2	19,671.9
Deposits:
Non-interest bearing	8,240.6	5,568.3
Interest bearing	19,847.7	10,701.3
Total deposits	28,088.3	16,269.6
Securities sold under repurchase agreements	1,071.0	1,051.1
Accounts payable and accrued expenses	266.1	148.4
Accrued interest payable	6.0	3.7
Deferred tax liability, net	0.0	9.3
Long-term debt	120.4	112.4
Allowance for credit losses on off-balance sheet credit exposures	6.2	3.8
Subordinated debentures held by subsidiary trusts	163.1	87.0
Total liabilities	29,721.1	17,685.3
Stockholders’ equity:
Preferred stock, no par value; 100,000,000 shares authorized; none issued and outstanding	0.0	0.0
#REF!	2,668.6	945.0
Retained earnings	974.5	1,052.6
Accumulated other comprehensive loss, net	(202.0)	(11.0)
Total stockholders’ equity	3,441.1	1,986.6
Total liabilities and stockholders’ equity	$ 33,162.2	$ 19,671.9

XML

Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Investment securities:
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 1,600,000	$ 0
Estimated fair value	$ 3,029,100,000	$ 1,667,500,000
Stockholders' equity:
Preferred Stock, Par or Stated Value Per Share	$ 0	$ 0
Nonvoting, noncumulative preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Nonvoting, noncumulative preferred stock, shares issued (in shares)	0	0
Nonvoting, noncumulative preferred stock, shares outstanding (in shares)	0	0
Common Stock, Shares, Issued		62,200,456
Common Stock, Shares Authorized		150,000,000
Common Stock, Par or Stated Value Per Share	$ 0	$ 0
Preferred Stock, Shares Outstanding	0	0
Shares outstanding (in shares)	109,503,010	62,200,456
Common Stock, Shares, Issued		62,200,456
Class A Common Stock
Stockholders' equity:
Shares outstanding (in shares)		41,699,409

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Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income:
Interest and fees on loans	$ 151.7	$ 107.8
Interest and dividends on investment securities:
Taxable	29.3	15.8
Exempt from federal taxes	1.3	1.4
Interest on deposits in banks	1.7	0.3
Total interest income	184.0	125.3
Interest expense:
Interest on deposits	3.0	2.3
Interest on securities sold under repurchase agreements	0.3	0.1
Interest on long-term debt	1.7	1.5
Interest on subordinated debentures held by subsidiary trusts	1.0	0.7
Total interest expense	6.0	4.6
Net interest income	178.0	120.7
Provision for (reversal of) credit losses	61.3	(5.1)
Net interest income after provision for (reversal of) credit losses	116.7	125.8
Non-interest income:
Debt Securities, Available-for-sale, Gain (Loss)	(0.1)	0.0
Mortgage banking revenues	8.4	11.6
Other income	6.0	4.1
Total non-interest income	49.2	38.1
Non-interest expense:
Salaries and wages	60.0	39.0
Employee benefits	21.2	16.1
Outsourced technology services	11.3	8.1
Occupancy, net	10.0	7.3
Furniture and equipment	5.4	4.4
OREO expense, net of income	0.1	(0.1)
Professional fees	3.9	3.4
FDIC insurance premiums	3.3	1.6
Other intangibles amortization	3.6	2.5
Other expenses	23.2	16.1
Acquisition related expenses	65.2	0.0
Noninterest Expense	207.2	98.4
(Loss) income before income tax	(41.3)	65.5
(Benefit from) provision for income tax	(7.9)	14.1
Net (loss) income	$ (33.4)	$ 51.4
Earnings per common share, basic (in dollars per share)	$ (0.36)	$ 0.83
Earnings per common share, diluted (in dollars per share)	$ (0.36)	$ 0.83
Weighted average common shares outstanding, basic (in shares)	92,855,173	61,591,877
Weighted average common shares outstanding, diluted (in shares)	92,855,173	61,714,063
Payment services revenues
Non-interest income:
Non-interest income	$ 14.8	$ 10.2
Wealth management revenues
Non-interest income:
Wealth management revenues	8.1	6.3
Service charges on deposit accounts
Non-interest income:
Non-interest income	7.7	3.8
Other service charges, commissions, and fees
Non-interest income:
Non-interest income	$ 4.3	$ 2.1

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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (33.4)	$ 51.4
Other comprehensive (loss) income, before tax:
Change in net unrealized loss during period	(252.6)	(66.8)
Reclassification adjustment for net loss included in income	0.1	0.0
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	0.2	0.0
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax	(23.0)	0.0
Change in unrealized loss (gain) on derivatives	21.3	(0.1)
Other comprehensive loss, before tax	(254.0)	(66.9)
Changes in deferred taxes related to other comprehensive loss	63.0	17.0
Other comprehensive loss, net of tax	(191.0)	(49.9)
Comprehensive (loss) income, net of tax	$ (224.4)	$ 1.5

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Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common stock	Retained earnings	Accumulated other comprehensive income (loss)
Equity, beginning balance at Dec. 31, 2020	$ 1,959.8	$ 941.1	$ 962.1	$ 56.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	51.4	0.0	51.4	0.0
Other comprehensive income (loss), net of tax expense	(49.9)	0.0	0.0	(49.9)
Common stock transactions:
Common shares purchased and retired	$ (5.4)	(5.4)	0.0	0.0
Common shares issued (in shares)	604
Common shares issued	$ 0.0	0.0	0.0	0.0
Non-vested common shares issued	0.0	0.0	0.0	0.0
Non-vested common shares forfeited or canceled	0.4	(0.4)	0.0	0.0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts	2.4	2.4	0.0	0.0
Stock-based compensation expense	(25.3)	0.0	(25.3)	0.0
Equity, ending balance at Mar. 31, 2021	1,933.4	938.5	988.2	6.7
Equity, beginning balance at Dec. 31, 2021	1,986.6	945.0	1,052.6	(11.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(33.4)	0.0	(33.4)	0.0
Other comprehensive income (loss), net of tax expense	(191.0)	0.0	0.0	(191.0)
Common stock transactions:
Common shares purchased and retired	$ (1.4)	(1.4)	0.0	0.0
Common shares issued (in shares)	46,887,104
Common shares issued	$ 1,722.5	1,722.5	0.0	0.0
Non-vested common shares issued	0.0	0.0	0.0	0.0
Non-vested common shares forfeited or canceled	0.0	0.0	0.0	0.0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts	0.1	0.1	0.0	0.0
Stock-based compensation expense	2.4	2.4	0.0	0.0
Common cash dividend declared	(44.7)	0.0	(44.7)	0.0
Equity, ending balance at Mar. 31, 2022	$ 3,441.1	$ 2,668.6	$ 974.5	$ (202.0)

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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Stock repurchased and retired (in shares)	37,698	127,180
Common shares issued (in shares)	46,887,104	604
Non-vested common shares issued (in shares)	450,813	239,525
Non-vested common shares forfeited (in shares)	15,472	19,068
stock options exercised (in shares)	17,807	40,663
Shares tendered (in shares)	4,877	6,177
Common dividends (in dollars per share)	$ 0.41	$ 0.41

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (33.4)	$ 51.4
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for (reversal of) credit losses	61.3	(5.1)
Net gain on disposal of premises and equipment	(0.2)	(0.4)
Depreciation and amortization	13.3	11.4
Net premium amortization on investment securities	8.1	7.7
Net loss on investment securities transactions	0.1	0.0
Realized and unrealized net gains on mortgage banking activities	(3.3)	(3.9)
Net gain on sale of OREO	0.0	(0.1)
Gain (Loss) on Extinguishment of Debt	(1.4)	0.0
Mortgage servicing rights recovery	(3.4)	(5.9)
Deferred taxes	6.5	(9.6)
Net increase in cash surrender value of company-owned life insurance	(2.0)	(1.2)
Stock-based compensation expense	2.4	2.4
Originations of mortgage loans held for sale	(98.8)	(156.4)
Proceeds from sales of mortgage loans held for sale	112.0	177.2
Changes in operating assets and liabilities:
(Increase) decrease in interest receivable	(0.6)	1.1
Decrease (increase) in other assets	4.3	(7.8)
(Decrease) increase in accrued interest payable	(0.1)	1.1
Increase (decrease) in accounts payable and accrued expenses	13.1	(10.6)
Net cash provided by operating activities	64.9	70.5
Purchases of investment securities:
Held-to-maturity	(370.0)	(825.1)
Available-for-sale	(1,144.5)	(378.6)
Proceeds from sales, maturities, and pay-downs of investment securities:
Held-to-maturity	106.4	9.3
Available-for-sale	826.5	293.7
Extensions of credit to clients, net of repayments	106.4	(58.7)
Proceeds from sale of OREO	0.3	0.7
Acquisition of bank and bank holding company, net of cash and cash equivalents received	2,006.9		$ 0.0
Payments for (Proceeds from) Productive Assets	(9.5)	(0.5)
Net cash provided by (used in) investing activities	1,522.5	(959.2)
Cash flows from financing activities:
Net increase in deposits	130.8	877.0
Net decrease in securities sold under repurchase agreements	(55.0)	(38.8)
Repayments of long-term debt	(157.9)	0.0
Advances on long-term debt	8.0	0.0
Payments of Stock Issuance Costs	(0.8)	0.0
Proceeds from issuance of common stock, net	0.1	0.4
Purchase and retirement of common stock	(1.4)	(5.4)
Dividends paid to common stockholders	(44.7)	(25.3)
Net cash (used in) provided by financing activities	(120.9)	807.9
Net increase (decrease) in cash and cash equivalents	1,466.5	(80.8)
Cash and cash equivalents at beginning of period	2,344.8	2,276.8	$ 2,276.8
Cash and cash equivalents at end of period	3,811.3	2,196.0
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	0.1	21.0
Cash paid during the period for interest expense	6.0	3.5
Supplemental disclosures of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	19.9	0.0
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity	10.9	0.0
Debt Securities, Available-For-Sale, Transfer, Unrealized Gain (Loss)	463.6	0.0
Transfer of loans from held-for-sale to held for investment	19.8	0.0
Transfer of loans to other real estate owned	0.0	0.3
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	1,723.3	0.0
Capitalization of internally originated mortgage servicing rights	1.1	0.1
Investment securities	2,699.0	0.0
Securities Purchased under Agreements to Resell, Increase	101.1	0.0
Loans held for sale	181.9	0.0
Loans held for investment, net	7,629.1	0.0
Premises and equipment	144.1	0.0
Goodwill	516.0	0.0
Company-owned life insurance	186.6	0.0
Noncash or Part Noncash Acquisition, Deferred Tax Assets Acquired	76.1	0.0
Noncash or Part Noncash Acquisition, Intangible Assets Acquired, Other Real Estate Owned	15.8	0.0
Other assets	198.0	0.0
Total noncash assets acquired	11,820.9	0.0
Noncash or Part Noncash Acquisition, Liabilities Assumed, Deposits	11,688.0	0.0
Securities sold under repurchase agreements	74.0	0.0
Accounts payable and accrued expenses	107.1	0.0
Long-term debt	159.3	0.0
Noncash or Part Noncash Acquisition, Liabilities Assumed, Trust preferred securities	76.1	0.0
Total liabilities assumed	12,104.5	0.0
Core Deposits
Supplemental disclosures of non-cash investing and financing activities:
Other intangibles	71.9	0.0
Servicing Contracts
Supplemental disclosures of non-cash investing and financing activities:
Other intangibles	$ 1.3	$ 0.0

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Basis of Presentation

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc., First Interstate Bank (“FIB”), and its other subsidiaries (collectively, the “Company”) contain all adjustments (all of which are of a normal recurring nature) necessary to present fairly the financial position of the Company at March 31, 2022 and December 31, 2021, the results of operations, changes in stockholders’ equity, and cash flows for each of the three month periods ended March 31, 2022 and 2021, in conformity with U.S. generally accepted accounting principles (“GAAP”). The balance sheet information at December 31, 2021 is derived from the audited consolidated financial statements. Certain reclassifications, none of which were material, have been made to conform the Company’s prior year financial statements to the March 31, 2022 presentation. These reclassifications did not change previously reported net income or stockholders’ equity.

These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021, which includes a description of significant accounting policies. Operating results for the three months ended March 31, 2022 are not necessarily indicative of the results that may be expected for the year ending December 31, 2022.

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Investment Securities

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

The amortized cost and the approximate fair values of investment securities are summarized as follows:

March 31, 2022	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-Sale:
U.S. Treasury notes	$	698.2	$	—	$	(53.3)	$	644.9
State, county, and municipal securities	320.3		0.2		(27.8)		292.7
Obligations of U.S. government agencies	144.6		—		(6.7)		137.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	3,816.4		1.1		(171.8)		3,645.7
Private mortgage-backed securities	288.4		—		(13.6)		274.8
Collateralized loan obligations	1,075.4		—		(4.5)		1,070.9
Corporate securities	231.8		0.5		(15.4)		216.9
Total	$	6,575.1	$	1.8	$	(293.1)	$	6,283.8

March 31, 2022	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held-to-Maturity:
U.S. Treasury notes	$	296.2	$	—	$	296.2	$	—	$	—	$	296.2
State, county, and municipal securities	197.3		(0.1)		197.2		0.8		(21.4)		176.6
Obligations of U.S. government agencies	340.8		—		340.8		—		(32.3)		308.5
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations (1)	2,302.0		—		2,302.0		18.2		(152.4)		2,167.8
Corporate securities	84.0		(1.5)		82.5		0.2		(2.7)		80.0
Total	$	3,220.3	$	(1.6)	$	3,218.7	$	19.2	$	(208.8)	$	3,029.1
(1) Amortized cost presented above include $21.8 million of unamortized losses and $17.9 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 and 2022 transfer of securities from available-for-sale to held-to-maturity.

December 31, 2021	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-Sale:
U.S. Treasury notes	$	697.6	$	—	$	(12.9)	$	684.7
State, county, and municipal securities	434.7		2.1		(9.3)		427.5
Obligations of U.S. government agencies	356.0		0.1		(9.2)		346.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	2,027.3		14.1		(23.3)		2,018.1
Private mortgage-backed securities	174.4		0.1		(1.1)		173.4
Collateralized loan obligation	898.2		1.2		—		899.4
Corporate securities	271.1		3.0		(3.6)		270.5
Total	$	4,859.3	$	20.6	$	(59.4)	$	4,820.5

December 31, 2021	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held-to-Maturity:
State, county, and municipal securities	$	67.6	$	—	$	67.6	$	2.0	$	(0.4)	$	69.2
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations(1)	1,609.0		—		1,609.0		13.2		(35.3)		1,586.9
Corporate securities	11.0		—		11.0		0.4		—		11.4
Total	$	1,687.6	$	—	$	1,687.6	$	15.6	$	(35.7)	$	1,667.5
(1) Amortized cost presented above include $20.1 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 transfer of securities from available-for-sale to held-to-maturity.

On February 1, 2022, in conjunction with the acquisition of GWB and under ASC 320, the Company transferred debt securities classified as held-to-maturity with an amortized cost of $10.7 million and an estimated fair value of $10.9 million to the available-for-sale category classification and transferred debt securities classified as available-for-sale with an amortized cost of $485.9 million and an estimated fair value of $463.6 million to the held-to-maturity classification to maintain the Company’s intended risk profile. The transfer of debt securities into the available-for-sale and held-to-maturity categories were recorded at fair value on the date of transfer. This discount, as well as the related unrealized loss in accumulated other comprehensive income, will be amortized into interest income as a yield adjustment over the remaining term of the securities. The amortization of the unrealized loss reported in accumulated other comprehensive (loss) income will offset the effect on interest income of the accretion of the discount. No gains or losses were recorded at the time of transfer.

The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in an unrealized loss position as of March 31, 2022 and December 31, 2021.

	Less than 12 Months				12 Months or More				Total
March 31, 2022	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Available-for-Sale:
U.S. Treasury notes	$	644.9	$	(53.3)	$	—	$	—	$	644.9	$	(53.3)
State, county, and municipal securities	223.6		(22.7)		29.6		(5.1)		253.2		(27.8)
Obligations of U.S. government agencies	101.5		(5.4)		15.4		(1.3)		116.9		(6.7)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	3,238.5		(163.4)		84.9		(8.4)		3,323.4		(171.8)
Private mortgage-backed securities	274.8		(13.6)		—		—		274.8		(13.6)
Collateralized loan obligations	1,020.9		(4.5)		—		—		1,020.9		(4.5)
Corporate securities	146.7		(13.5)		19.3		(1.9)		166.0		(15.4)
Total	$	5,650.9	$	(276.4)	$	149.2	$	(16.7)	$	5,800.1	$	(293.1)

	Less than 12 Months				12 Months or More				Total
December 31, 2021	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Available-for-Sale:
U.S. Treasury notes	$	684.7	$	(12.9)	$	—	$	—	$	684.7	$	(12.9)
State, county, and municipal securities	278.7		(9.1)		5.0		(0.2)		283.7		(9.3)
Obligations of U.S. government agencies	297.0		(8.9)		16.4		(0.3)		313.4		(9.2)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	1,262.8		(23.0)		26.4		(0.3)		1,289.2		(23.3)
Private mortgage-backed securities	127.2		(1.1)		—		—		127.2		(1.1)
Corporate securities	109.9		(3.3)		20.9		(0.3)		130.8		(3.6)
Total	$	2,760.3	$	(58.3)	$	68.7	$	(1.1)	$	2,829.0	$	(59.4)

As of March 31, 2022 and December 31, 2021, there were no holdings of securities of any issuer, other than the U.S. government and its agencies, in an amount greater than 10% of stockholders’ equity.

During the three month period ended March 31, 2022, the Company acquired $2,356.9 million of available-for-sale securities and $342.1 million of held-to-maturity securities in connection with the acquisition of GWB. Such securities were evaluated and it was determined that there were no investment securities that met the definition of a PCD asset and classified as PCD upon acquisition.

The Company determines credit losses on both available-for-sale and held-to-maturity investment securities by a discounted cash flow approach using the security’s effective interest rate at the time of purchase or upon acquisition. The allowance for credit losses is measured as the amount by which an investment security’s amortized cost exceeds the net present value of expected future cash flows. However, the amount of credit losses for available-for-sale investment securities is limited to the amount of a security’s unrealized loss. Credit losses on held-to-maturity investment securities are representative of current expected credit losses that may be incurred over the life of the investment. The allowance for credit losses is established through a charge to provision for credit losses in current period earnings.

The available-for-sale securities portfolio contains securities that are guaranteed by a sovereign entity or are generally considered to have non-credit related risks, such as interest rate risk or prepayment and liquidity factors. The Company considers whether the securities are issued by the federal government or its agencies and whether downgrades by bond rating agencies have occurred. The Company had no allowance for credit losses for available-for-sale investment securities as of March 31, 2022 and December 31, 2021.

As of March 31, 2022 and December 31, 2021, the Company had 965 and 285 individual investment securities, respectively, that were in an unrealized loss position, which was related primarily to fluctuations in current interest rates. As of March 31, 2022, the Company had the intent and ability to hold these investment securities for a period of time sufficient to allow for an anticipated recovery. The Company does not intend to sell any of the available-for-sale securities in the above table and the Company does not anticipate it will have to sell any securities before a recovery in cost.

The following table presents the activity in the allowance for credit losses related to held-to-maturity securities classified as corporate and state, county, and municipal securities:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	—	$	—
Provision for credit loss expense	1.6		—
Ending balance of allowance for credit losses	$	1.6	$	—

There was no allowance for credit losses on held-to-maturity securities at December 31, 2021.

On a quarterly basis, the Company refreshes the credit quality of each held-to-maturity security. The following table summarizes the credit quality indicators of held-to-maturity securities at amortized cost for the periods indicated:

March 31, 2022	AAA		AA		A		BBB		Not Rated		Total
U.S. Treasury notes	$	296.2	$	—	$	—	$	—	$	—	$	296.2
State, county, and municipal securities	72.6		102.7		13.7		—		8.3		197.3
Obligations of U.S. government agencies	340.8		—		—		—		—		340.8
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC	1,958.2		—		—		—		—		1,958.2
GNMA	343.8		—		—		—		—		343.8
Corporate securities	—		—		4.0		75.0		5.0		84.0
Total	$	3,011.6	$	102.7	$	17.7	$	75.0	$	13.3	$	3,220.3

December 31, 2021	AAA		AA		A		BBB		Not Rated		Total
State, county, and municipal securities	$	17.2	$	31.6	$	14.7	$	—	$	4.1	$	67.6
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC	1,439.1		—		—		—		—		1,439.1
GNMA	169.9		—		—		—		—		169.9
Corporate securities	—		—		4.0		7.0		—		11.0
Total	$	1,626.2	$	31.6	$	18.7	$	7.0	$	4.1	$	1,687.6

As of March 31, 2022 and December 31, 2021, the Company had $23.6 million and $16.6 million, respectively, of accrued interest receivable on the consolidated balance sheet. The Company does not consider accrued interest receivable in the carrying amount of financial assets held at the amortized cost basis or in the allowance for credit losses calculation.

As of March 31, 2022 and December 31, 2021, there were no available-for-sale or held-to-maturity securities on nonaccrual status. All securities in the portfolio were current with their contractual principal and interest payments. As of March 31, 2022 and December 31, 2021, there were no collateral dependent available-for-sale or held-to-maturity securities.

There were no material gross realized gains and no material gross realized losses on the disposition of available-for-sale investment securities during the three month periods ended March 31, 2022 and 2021.

Maturities of securities do not reflect rate repricing opportunities present in adjustable-rate mortgage-backed securities. In the table below, the Company had variable rate mortgage-backed and corporate securities which had an amortized cost of $253.0 million and were classified as available-for-sale as of March 31, 2022. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.

	Available-for-Sale				Held-to-Maturity
March 31, 2022	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Within one year	$	926.6	$	886.6	$	377.1	$	355.3
After one year but within five years	2,724.4		2,592.0		1,334.1		1,274.0
After five years but within ten years	1,139.8		1,074.3		1,026.2		956.0
After ten years	1,784.3		1,730.9		482.9		443.8
Total	$	6,575.1	$	6,283.8	$	3,220.3	$	3,029.1

As of March 31, 2022, the Company held investment securities callable within one year having amortized costs and estimated fair values of $206.3 million and $202.3 million, respectively. These investment securities are primarily included in the “after five years but within ten years” category in the table above. As of March 31, 2022, the Company held no callable structured notes.

As of March 31, 2022 and December 31, 2021, the Company has amortized costs of $2,587.0 million and $2,617.8 million, respectively, for investment securities pledged to secure public deposits and securities sold under repurchase agreements and had approximate fair values of $2,421.8 million and $2,610.8 million, as of March 31, 2022 and December 31, 2021, respectively. All securities sold under repurchase agreements are with clients and mature on the next banking day. The Company retains possession of the underlying securities sold under repurchase agreements.

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Acquisitions

3 Months Ended

Mar. 31, 2022

Business Combinations [Abstract]

Acquisitions

Acquisition

Great Western Bank. On September 15, 2021, the Company entered into a definitive agreement (“Agreement”) to acquire 100% of the outstanding stock of Great Western Bancorp, Inc. (“Great Western”), the parent company of Great Western Bank (“GWB”), a Sioux Falls, South Dakota based community bank with 174 banking offices across Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota. The acquisition of GWB expanded the Company’s geographical footprint with an enhanced platform for future growth. The acquisition was completed on February 1, 2022.

Consideration for the acquisition was $1,723.3 million, consisting of the issuance of 46.9 million shares of the Company’s Class A common stock valued at $36.76 per share, which was the opening price of the Company’s Class A common stock as quoted on the NASDAQ stock market on the acquisition date. Holders of shares of Great Western common stock received 0.8425 shares of First Interstate Class A common stock for each whole share of Great Western common stock and received cash in lieu of fractional shares. Previously unvested Great Western restricted stock awards that were outstanding immediately prior to the close of the transaction became vested and were considered issued and outstanding at acquisition close and included in consideration.

The Company accounted for this transaction under the acquisition method of accounting in accordance with ASC 805, Business Combinations, which requires purchased assets and liabilities assumed and consideration exchanged to be recorded at their respective estimated fair values at the date of acquisition. The determination of estimated fair values required management to make certain estimates about discount rates, future expected cash flows, and market conditions at the time of the acquisition, as well as other future events that are highly subjective in nature. This determination is subject to refinement for up to one year after the closing date of the acquisition as additional information relative to the closing date fair values becomes available and such information is considered final, whichever is earlier.

The following table provides the provisional purchase price allocation as of the acquisition date and the Great Western assets acquired and liabilities assumed at their estimated fair value as of the acquisition date. We recorded the estimate of fair value based on initial valuations available at the acquisition date. The excess value of the consideration paid over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation resulted in provisional goodwill of $516.0 million, which is not deductible for income tax purposes. Goodwill resulting from the acquisition was allocated to the Company’s one operating segment, community banking, and consists largely of the synergies and economies of scale expected from combining the operations of Great Western and the Company. Due to the recent closing of the transaction, all amounts reported are provisional pending the review of valuations obtained from third parties.

As of February 1, 2022
Assets acquired:
Cash and cash equivalents	$	2,006.9
Investment securities	2,699.0
Securities purchased under agreement to resell	101.1
Loans held for sale	181.9
Loans held for investment	7,713.4
Allowance for credit losses	(84.3)
Premises and equipment, including right of use lease assets	144.1
Other real estate owned (“OREO”)	15.8
Company owned life insurance	186.6
Core deposit intangibles	49.1
Customer relationship intangible	22.8
Mortgage servicing rights	1.3
Deferred tax assets, net	76.1
Other assets	198.0
Total assets acquired	13,311.8
Liabilities assumed:
Deposits	11,688.0
Securities sold under repurchase agreements	74.0
Accrued expenses and other liabilities	107.1
FHLB advances	122.9
Subordinated debt	36.4
Subordinated debentures held by subsidiary trusts	76.1
Total liabilities assumed	12,104.5
Net assets acquired	$	1,207.3
Consideration paid:
Class A common stock	1,723.3
Total consideration paid (1)	$	1,723.3
Goodwill	$	516.0

(1) Includes $13 thousand of cash paid in lieu of fractional shares.

The Company determined the fair value of loans, core deposit and customer relationship intangible assets, investment securities, premises and equipment, leases, mortgage servicing rights, deposits, FHLB advances, subordinated debt, and subordinated debentures held by subsidiary trusts with the assistance of third-party valuation specialists. The following is a description of the methods used to determine the fair values of significant assets and liabilities presented above.

Cash and cash equivalents

The carrying amount of these assets is a reasonable estimate of fair value based on the short-term nature of these assets.

Investment Securities

Fair values for securities are based on quoted market prices, where available. If quoted market prices are not available, fair value estimates are based on observable inputs including quoted market prices for similar instruments, quoted market prices that are not in an active market or other inputs that are observable in the market. In the absence of observable inputs, fair value is estimated based on pricing models and/or discounted cash flow methodologies.

Loans held for sale

The loans held for sale portfolio was recorded at fair value at the date of acquisition based on quotes or bids from third party investors.

Loans held for investment

The loans held for investment portfolio was recorded at fair value at the date of acquisition. A valuation of the loans held for investment portfolio was performed by a third party as of the acquisition date in accordance with ASC 820 to assess the fair value of the loan portfolio, considering adjustments for interest rate risk, required equity return, servicing, credit, and liquidity risk. The loans held for investment portfolio was segmented into two groups including purchase credit deteriorated (PCD) loans and non-PCD loans. The non-PCD loans were pooled based on similar characteristics, such as loan type, fixed or adjustable interest rates, payment type, index rate and caps/floors, and non-accrual status. The PCD loans were valued at the loan level with similar characteristics noted above. The fair value was calculated using a discounted cash flow analysis. The discount rate utilized to analyze fair value considered the cost of funds rate, capital charge, servicing costs, and liquidity premium, mostly based on industry standards.

The Company is required to record PCD assets, defined as a more-than-insignificant deterioration in credit quality since origination or issuance, at the purchase price plus the allowance for credit losses expected at the time of acquisition. Under this method, there is no credit loss expense affecting net income on acquisition of PCD assets. Changes in estimates of expected credit losses after acquisition are recognized in subsequent periods as credit loss expense (or reversal of credit loss expense) arise. Any non-credit discount or premium resulting from acquiring a pool of purchased financial assets with credit deterioration is allocated to each individual asset. At the acquisition date, the initial allowance for credit losses determined on a collective basis is allocated to individual assets to appropriately allocate any non-credit discount or premium. The non-credit discount or premium, after the adjustment for the allowance for credit losses, is accreted to interest income using the interest method based on the effective interest rate determined after the adjustment for credit losses at the adoption date. Information regarding loans acquired at the acquisition date is as follows:

(In millions)
PCD loans:
Unpaid principal balance	$	979.2
Principal amounts previously written off by GWB	(238.7)
Interest applied to principal by GWB	(18.1)
Adjusted unpaid principal balance	722.4
Credit discount	(90.9)
Discount attributable to other factors	(24.6)
Fair value	606.9
Allowance for credit losses	84.3
Amortized cost basis	691.2
Non-PCD loans:
Unpaid principal balance	7,107.9
Credit discount (1)	(76.5)
Non-credit discount	(9.2)
Fair value	7,022.2
Amortized cost basis	$	7,713.4
(1) Represents the best estimate of the contractual cash flows not expected to be collected as of the acquisition date.

Core deposit intangible

Core deposit intangible assets of $49.1 million on non-maturing deposits were determined by evaluating the underlying characteristics of the deposit relationships, including customer attrition, deposit interest rates and maintenance costs, and costs of alternative funding using the discounted cash flow approach. The core deposit intangibles represent the costs saved by the Company between maintaining the existing deposits and obtaining alternative funds over the life of the deposit base. These costs are amortized using an accelerated method over the estimated useful life of 10 years for the related deposits.

Premises and equipment

The fair values of premises are based on a market approach, using third-party appraisals of value for land and premises.

Deposits

The fair values used for the demand and savings deposits equal the amounts payable on demand at the acquisition date. In determining the fair value of certificates of deposit, the cash flows of the contractual interest payments during the specific period of the certificates of deposit and scheduled principal payout were discounted to present value at market-based interest rates.

Customer relationship intangible

Customer relationship intangible assets of $22.8 million were determined using an excess earnings model associated with the expected fee income related to the underlying client relationships and is being amortized using the straight-line method over the estimated useful life of 12 years.

FHLB advances

The fair value of fixed rate Federal Home Loan Bank of Des Moines (“FHLB”) advances was determined using a discounted cash flow approach. The cash flows of the advances were projected based on scheduled payments of the fixed rate advances, which factored in prepayment fees. The cash flows were then discounted to present value using the FHLB rates as of February 1, 2022.

Subordinated debt and subordinated debentures held by subsidiary trusts

The fair value of subordinated debt and subordinated debentures held by subsidiary trusts was determined by using a discounted cash flow method using a market participant discount rate for similar instruments over the remaining terms.

Acquisition related expenses related to the GWB acquisition of $65.2 million for the three month period ended March 31, 2022 were included as a component of non-interest expense in the consolidated income statement, of which approximately $25.8 million are acquisition related costs as defined by ASC 805. The Company contributed $21.5 million to the First Interstate Foundation and reimbursed an aggregate of $8.2 million of the Scott family control group’s acquisition expenses pursuant to the Agreement.

The accompanying consolidated statements of loss for the three months ended March 31, 2022, include the results of operations of the acquired entity from the February 1, 2022 acquisition date. The disclosure of GWB post-acquisition revenue and net income is not practical due to the combining of certain GWB operations with and into FIB as of the acquisition date. Although legally merged with FIB, the acquired entity will continue to do business as GWB until system conversion, expected to occur in May 2022, at which point GWB’s operations will be integrated with the Company’s operations.

The following table presents certain unaudited pro forma financial information for illustrative purposes only, for the three month periods ended March 31, 2022 and 2021 as if GWB had been acquired on January 1, 2021. This unaudited pro forma information combines the historical results of GWB with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred at the beginning of the year prior to the acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value, cost savings, or business synergies. As a result, actual amounts would have differed from the unaudited pro forma information presented, and the differences could be significant.

	Three Months Ended March 31,
	2022		2021
Total revenues	$	268.9	$	321.6
Net income (loss)	$	76.4	$	(78.2)
Earnings (loss) per common share (Basic)	$	0.70	$	(0.72)
Earnings (loss) per common share (Diluted)	$	0.70	$	(0.72)

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Goodwill and Core Deposit Intangibles

3 Months Ended

Mar. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

Goodwill

Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances, such as upon material adverse changes in legal, business, regulatory, and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 1, 2021 and 2020 and concluded that there was no impairment to goodwill.

The following table details changes in the recorded amount of goodwill as of the dates indicated:

	March 31, 2022		December 31, 2021
Net carrying value at beginning of the period	$	621.6	$	621.6
Provisional additions to goodwill from acquisition	516.0		—
Net carrying value at end of period	$	1,137.6	$	621.6

Other Intangible Assets

Other intangible assets are comprised of core deposit intangibles (“CDI”) and other customer relationship intangibles (“OCRI”) and amounted to the following at March 31, 2022 and December 31, 2021:

	CDI		OCRI		Total
March 31, 2022
Gross other intangible assets, at beginning of the period	$	106.0	$	—	$	106.0
Provisional amounts established through acquisition	49.1		22.8		71.9
Accumulated amortization	(68.0)		(0.3)		(68.3)
Net other intangible assets, end of period	$	87.1	$	22.5	$	109.6
December 31, 2021
Gross other intangible assets, at beginning of the period	$	106.0	$	—	$	106.0
Accumulated amortization	(64.7)		—		(64.7)
Net other intangible assets, end of period	$	41.3	$	—	$	41.3

The Company recorded $3.6 million and $2.5 million of other intangible asset amortization expense for the three months ended March 31, 2022 and 2021, respectively.

CDI and OCRI are evaluated for impairment if events and circumstances indicate a possible impairment. CDI is amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is generally 10 years. OCRI is amortized using a straight-line method over its estimated useful life of 12 years based on customer revenue attrition on an annualized basis.

The following table provides the estimated aggregate future amortization expense of other intangible assets:

Years Ending December 31,	CDI		OCRI		Total
2022 remaining	$	10.9	$	1.4	$	12.3
2023	13.7		1.9		15.6
2024	12.7		1.9		14.6
2025	11.8		1.9		13.7
2026	11.0		1.9		12.9
Thereafter	27.0		13.5		40.5
Total	$	87.1	$	22.5	$	109.6

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Loans Held for Investment

3 Months Ended

Mar. 31, 2022

Receivables [Abstract]

Loans

Loans Held for Investment

The following table presents loans by segment as of the dates indicated:

	March 31, 2022		December 31, 2021
Real estate loans:
Commercial	$	7,805.7	$	3,971.5
Construction loans:
Land acquisition & development	344.8		247.8
Residential	406.0		262.0
Commercial	844.8		498.0
Total construction loans	1,595.6		1,007.8
Residential	1,997.5		1,538.2
Agricultural	833.6		213.9
Total real estate loans	12,232.4		6,731.4
Consumer loans:
Indirect	739.6		737.6
Direct and advance lines	142.5		129.2
Credit card	73.5		64.9
Total consumer loans	955.6		931.7
Commercial	3,017.9		1,475.5
Agricultural	744.3		203.9
Other, including overdrafts	4.6		1.5
Loans held for investment	16,954.8		9,344.0
Deferred loan fees and costs	(9.8)		(12.3)
Loans held for investment, net of deferred fees and costs	16,945.0		9,331.7
Allowance for credit losses	(247.2)		(122.3)
Net loans held for investment	$	16,697.8	$	9,209.4

Allowance for Credit Losses

The following tables represent, by loan portfolio segment, the activity in the allowance for credit losses for loans held for investment:

Three Months Ended March 31, 2022	Beginning Balance		Initial ACL Recorded for PCD loans		Provision for (reversal of) Credit Losses (2)		Loans Charged-Off		Recoveries Collected		Ending Balance
Allowance for credit losses (1)
Real estate:
Commercial real estate:
Non-owner occupied	$	17.3	$	24.1	$	6.7	$	(2.9)	$	—	$	45.2
Owner occupied	13.3		9.5		4.6		(2.2)		—		25.2
Multi-family	13.3		29.9		11.4		—		—		54.6
Total commercial real estate	43.9		63.5		22.7		(5.1)		—		125.0
Construction:
Land acquisition & development	0.5		3.4		(0.8)		(2.7)		0.1		0.5
Residential construction	2.4		—		0.9		—		—		3.3
Commercial construction	6.0		0.2		4.0		—		—		10.2
Total construction	8.9		3.6		4.1		(2.7)		0.1		14.0
Residential real estate:
Residential 1-4 family	13.4		0.1		5.2		(0.1)		0.1		18.7
Home equity and HELOC	1.2		—		0.1		—		0.1		1.4
Total residential real estate	14.6		0.1		5.3		(0.1)		0.2		20.1
Agricultural real estate	1.9		2.3		6.4		(5.2)		—		5.4
Total real estate	69.3		69.5		38.5		(13.1)		0.3		164.5
Consumer:
Indirect	14.3		—		(0.3)		(0.9)		0.4		13.5
Direct and advance lines	4.6		—		(0.1)		(0.8)		0.9		4.6
Credit card	2.2		—		0.6		(0.6)		0.1		2.3
Total consumer	21.1		—		0.2		(2.3)		1.4		20.4
Commercial:
Commercial and floor plans	27.1		11.2		18.4		(4.2)		0.4		52.9
Commercial purpose secured by 1-4 family	4.4		0.2		0.4		—		—		5.0
Credit card	0.1		—		0.3		(0.1)		—		0.3
Total commercial	31.6		11.4		19.1		(4.3)		0.4		58.2
Agricultural:
Agricultural	0.3		3.4		(0.5)		(0.2)		1.1		4.1
Total agricultural	0.3		3.4		(0.5)		(0.2)		1.1		4.1
Total allowance for credit losses	$	122.3	$	84.3	$	57.3	$	(19.9)	$	3.2	$	247.2
(1) Amounts presented exclude the allowance for credit losses related to unfunded commitments. These amounts are included in Note “Financial Instruments with Off-Balance Sheet Risk” and the allowance for credit losses related to investment securities which are included in Note “Investment Securities” included in this report.
(2) Amounts include $68.3 million related to the acquired GWB non-PCD loans.

Three Months Ended March 31, 2021	Beginning Balance		Provision for (reversal of) Credit Losses		Loans Charged-Off		Recoveries Collected		Ending Balance
Allowance for credit losses (1)
Real estate:
Commercial real estate:
Non-owner occupied	$	25.5	$	(2.5)	$	—	$	—	$	23.0
Owner occupied	18.3		(0.8)		(0.1)		—		17.4
Multi-family	11.0		0.8		—		—		11.8
Total commercial real estate	54.8		(2.5)		(0.1)		—		52.2
Construction:
Land acquisition & development	1.3		(0.2)		—		0.1		1.2
Residential construction	1.6		(0.2)		—		—		1.4
Commercial construction	7.3		(0.2)		—		0.1		7.2
Total construction	10.2		(0.6)		—		0.2		9.8
Residential real estate:
Residential 1-4 family	11.4		0.1		—		—		11.5
Home equity and HELOC	1.4		—		(0.1)		0.1		1.4
Total residential real estate	12.8		0.1		(0.1)		0.1		12.9
Agricultural real estate	2.7		0.1		—		—		2.8
Total real estate	80.5		(2.9)		(0.2)		0.3		77.7
Consumer:
Indirect	16.7		—		(1.3)		0.6		16.0
Direct and advance lines	4.6		0.7		(0.8)		0.3		4.8
Credit card	2.6		(0.7)		(0.6)		0.2		1.5
Total consumer	23.9		—		(2.7)		1.1		22.3
Commercial:
Commercial and floor plans	34.2		(1.8)		(1.8)		0.4		31.0
Commercial purpose secured by 1-4 family	4.7		(0.2)		—		0.2		4.7
Credit card	0.3		0.2		(0.2)		—		0.3
Total commercial	39.2		(1.8)		(2.0)		0.6		36.0
Agricultural:
Agricultural	0.7		(0.1)		—		—		0.6
Total agricultural	0.7		(0.1)		—		—		0.6
Total allowance for credit losses	$	144.3	$	(4.8)	$	(4.9)	$	2.0	$	136.6
(1) Amounts presented exclude the allowance for credit losses related to unfunded commitments. These amounts are included in Note “Financial Instruments with Off-Balance Sheet Risk” included in this report.

Collateral-Dependent Financial Loans

A collateral-dependent financial loan relies solely on the operation or sale of the collateral for repayment. In evaluating the overall risk associated with a loan, the Company considers (1) character, overall financial condition and resources, and payment record of the borrower; (2) the prospects for support from any financially responsible guarantors; and (3) the nature and degree of protection provided by the cash flow and value of any underlying collateral. The loan may become collateral-dependent when the borrower is experiencing financial difficulty and, its sources of repayment become inadequate over time. At such time, the Company develops an expectation that repayment will be provided substantially through the operation or sale of the collateral.

The following tables present the amortized cost basis of collateral-dependent loans by class of loans as of the dates indicated:

	Collateral Type
As of March 31, 2022	Business Assets		Real Property		Other		Total
Real estate	$	0.2	$	67.5	$	—	$	67.7
Commercial	4.8		4.6		—		9.4
Agricultural	—		24.0		—		24.0
Total collateral-dependent	$	5.0	$	96.1	$	—	$	101.1

	Collateral Type
As of December 31, 2021	Business Assets		Real Property		Other		Total
Real estate	$	1.2	$	7.0	$	—	$	8.2
Commercial	1.8		1.0		—		2.8
Agricultural	—		0.7		—		0.7
Total collateral-dependent	$	3.0	$	8.7	$	—	$	11.7

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans classified in the following table as greater than 90 days past due continue to accrue interest. The following tables present the contractual aging of the Company’s recorded amortized cost basis in loans by portfolio as of the dates indicated.

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of March 31, 2022	Past Due		Past Due		Past Due		Past Due		Loans		Loans (1)		Loans
Real estate
Commercial	$	7.2	$	2.2	$	0.3	$	9.7	$	7,758.6	$	37.4	$	7,805.7
Construction:
Land acquisition & development	2.6		0.1		—		2.7		338.2		3.9		344.8
Residential	2.6		—		—		2.6		403.4		—		406.0
Commercial	0.4		—		—		0.4		844.4		—		844.8
Total construction loans	5.6		0.1		—		5.7		1,586.0		3.9		1,595.6
Residential	4.4		1.6		0.1		6.1		1,984.3		7.1		1,997.5
Agricultural	0.1		3.9		0.4		4.4		790.8		38.4		833.6
Total real estate loans	17.3		7.8		0.8		25.9		12,119.7		86.8		12,232.4
Consumer:
Indirect consumer	5.2		0.9		0.2		6.3		731.5		1.8		739.6
Other consumer	0.5		0.3		—		0.8		141.6		0.1		142.5
Credit card	0.3		0.2		0.4		0.9		72.6		—		73.5
Total consumer loans	6.0		1.4		0.6		8.0		945.7		1.9		955.6
Commercial	2.0		3.8		1.3		7.1		2,995.6		15.2		3,017.9
Agricultural	11.4		4.7		—		16.1		713.2		15.0		744.3
Other, including overdrafts	—		—		—		—		4.6		—		4.6
Loans held for investment	$	36.7	$	17.7	$	2.7	$	57.1	$	16,778.8	$	118.9	$	16,954.8

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of December 31, 2021	Past Due		Past Due		Past Due		Past Due		Loans		Loans (1)		Loans
Real estate
Commercial	$	1.1	$	1.0	$	0.6	$	2.7	$	3,960.8	$	8.0	$	3,971.5
Construction:
Land acquisition & development	0.2		—		—		0.2		246.9		0.7		247.8
Residential	4.2		—		—		4.2		257.8		—		262.0
Commercial	—		—		—		—		498.0		—		498.0
Total construction loans	4.4		—		—		4.4		1,002.7		0.7		1,007.8
Residential	3.0		0.8		0.1		3.9		1,531.4		2.9		1,538.2
Agricultural	1.9		0.2		—		2.1		206.9		4.9		213.9
Total real estate loans	10.4		2.0		0.7		13.1		6,701.8		16.5		6,731.4
Consumer:
Indirect consumer	5.1		1.4		0.4		6.9		729.0		1.7		737.6
Other consumer	0.5		0.2		0.1		0.8		128.3		0.1		129.2
Credit card	0.6		0.2		0.5		1.3		63.6		—		64.9
Total consumer loans	6.2		1.8		1.0		9.0		920.9		1.8		931.7
Commercial	4.9		0.7		1.1		6.7		1,463.8		5.0		1,475.5
Agricultural	0.7		—		—		0.7		201.6		1.6		203.9
Other, including overdrafts	—		—		—		—		1.5		—		1.5
Loans held for investment	$	22.2	$	4.5	$	2.8	$	29.5	$	9,289.6	$	24.9	$	9,344.0

(1) As of March 31, 2022 and December 31, 2021, none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three months ended March 31, 2022 and 2021, respectively. The Company reversed $1.0 million of accrued interest at March 31, 2022 and none for the same period in 2021.

Troubled Debt Restructurings

Modifications of performing loans are made in the ordinary course of business and are completed on a case-by-case basis through negotiation with the borrower in connection with the ongoing loan collection processes. Loan modifications are made to provide borrowers payment relief and typically include adjustments such as changes to interest rates, the implementation of interest only periods of less than twelve months, the deferment of short-term payments, and extension of amortization periods. A loan modification is considered a troubled debt restructuring if the borrower is experiencing financial difficulties and the Company, for economic or legal reasons, grants a concession to the borrower that it would not under other circumstances. Certain troubled loans are on non-accrual status at the time of debt restructuring. These restructured loans may be returned to accrual status if the borrower has exhibited sustained repayment performance in compliance with the restructuring agreement for a period of at least six months and the Company is reasonably assured of the borrower’s future performance. If the troubled debt restructuring meets these performance criteria, and the interest rate granted at the modification date is equal to or greater than the rate that the Company might grant for a new loan at the same time at comparable risk, then the loan will be reclassified to performing status and the accrual of interest will resume. Loans that return to performing status will continue to be evaluated individually for credit deterioration in the ordinary course of business.

The Company renegotiated loans in troubled debt restructurings in the amount of $23.0 million as of March 31, 2022, of which $8.3 million were included in non-accrual loans and $14.7 million were on accrual status. As of March 31, 2022, the Company allocated $0.6 million of its allowance for credit losses to these loans. The Company had no material commitments to lend additional funds to borrowers whose existing loans had been renegotiated or classified as non-accrual.

The Company renegotiated loans in troubled debt restructurings in the amount of $6.2 million as of December 31, 2021, of which $3.9 million were included in non-accrual loans and $2.3 million were on accrual status. As of December 31, 2021, the Company allocated $0.1 million of its allowance for credit losses to these loans. The Company had no material commitments to lend additional funds to borrowers whose existing loans had been renegotiated or classified as non-accrual.

The Company had $17.2 million of new troubled debt restructurings during the three months ended March 31, 2022, which were primarily attributable to the GWB acquisition.

	Number of Notes	Type of Concession								Principal Balance at Restructure
Three Months Ended March 31, 2022		Interest only period		Extension of term or amortization schedule		Interest rate adjustment		Other (1)
Commercial real estate	2	$	3.2	$	4.2	$	—	$	—	$	7.4
Residential real estate	1	—		0.5		—		—		0.5
Agricultural real estate	1	—		8.9		—		—		8.9
Commercial	1	—		—		—		0.4		0.4
Total loans restructured during period	5	$	3.2	$	13.6	$	—	$	0.4	$	17.2
(1) Other includes concessions that reduce or defer payments for a specified period of time and/or concessions that do not fit into other designated categories.

For troubled debt restructurings that were on non-accrual status or otherwise deemed collateral-dependent before a modification, the Company may record an allowance for credit losses depending on the circumstances. In periods after modification, the Company continues to evaluate all troubled debt restructurings for possible credit deterioration and, where deterioration is observed, recognizes credit loss through the allowance. Additionally, the Company continues to work these loans through the credit cycle through charge-off, pay-off, or foreclosure. Financial effects of modifications of troubled debt restructurings may include principal loan forgiveness or other charge-offs directly related to the restructuring. The Company had no charge-offs directly related to modifying troubled debt restructurings during the three months ended March 31, 2022 or 2021.

The Company had no material troubled debt restructurings resulting in payment default during the previous 12 months ended March 31, 2022. The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or the loan is placed on non-accrual status after the modification.

The Company modified the terms of certain other loans with a total recorded investment of $94.7 million as of March 31, 2022, where the loan did not meet the definition of a troubled debt restructuring and the borrowers had not been experiencing financial difficulties or there were delays in a payment considered to be insignificant. The Company determines whether a borrower is experiencing financial difficulty by evaluating the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification as required under the Company’s internal underwriting policy.

Purchased Credit Deteriorated Loans (PCD)

The Company analyzes all acquired loans at the time of acquisition for more-than-insignificant deterioration in credit quality since their origination date. Such loans are classified as PCD, also referred to as PCD loans. Acquired loans classified as PCD are recorded at an initial amortized cost, which is comprised of the purchase price of the loans plus the initial allowance for credit losses for the loans, and any resulting discount or premium related to factors other than credit. The Company accounts for interest income on PCD loans using the interest method, whereby any purchase discounts or premiums are accreted or amortized into interest income as an adjustment of the loan’s yield.

The following table reconciles the par value, or initial amortized cost, of PCD loans acquired in the GWB acquisition as of the date of the acquisition with the purchase price (or initial fair value of the loans):

Purchase price (initial fair value)	$	606.9
Allowance for credit losses (1)	323.0
Discount attributable to other factors (2)	49.3
Par value (unpaid principal balance)	$	979.2

(1) For acquired PCD loans, an allowance of $323.0 million was required with a corresponding increase to the amortized cost basis as of the acquisition date. For PCD loans where all or a portion of the loan balance had been previously written-off by GWB, or would be subject to write-off under the Company’s charge-off policy, a CECL allowance of $238.7 million, included as part of the grossed-up loan balance at acquisition was immediately written-off. The net impact to the allowance for PCD assets on the acquisition date was $84.3 million.

(2) Non-credit discount includes the difference between the amortized cost basis and the unpaid principal balance of $31.2 million established on GWB PCD loans acquired and interest applied to principal of $18.1 million.

Credit Quality Indicators

As part of the on-going and continuous monitoring of the credit quality of the Company’s loan portfolio, management tracks internally assigned risk classifications of loans based on relevant information about the ability of borrowers to service their debt. The factors considered by the Company include, among other factors, the borrower’s current financial information, historical payment experience, credit documentation, public information, and current economic trends. The Company analyzes loans individually to classify the credit risk of the loans. This analysis generally includes loans with an outstanding balance greater than $1.0 million, which are generally considered non-homogeneous loans, such as commercial loans and commercial real estate loans. This analysis is performed no less than on an annual basis, depending upon the size of exposure and the contractual obligations governing the borrower’s financial reporting frequency. Homogeneous loans, including small business loans, are typically managed by payment performance. The Company internally risk rates its loans in accordance with a Uniform Classification System developed jointly by the various bank regulatory agencies. The Uniform Classification System defines three broad categories of criticized assets, which the Company uses as credit quality indicators in addition to the 6 Pass ratings in its 10-point rating scale:

Special Mention — includes loans that exhibit a potential weakness in financial condition, loan structure, or documentation that warrants management’s close attention. If not promptly corrected, the potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Substandard — includes loans that are inadequately protected by the current net worth and paying capacity of the borrower which have well-defined weaknesses that jeopardize the liquidation of the debt. Although the primary source of repayment for a substandard loan may not currently be sufficient, collateral or other sources of repayment are sufficient to satisfy the debt. Continuance of a substandard loan is not warranted unless positive steps are taken to improve the worthiness of the credit.

Doubtful — includes loans that exhibit pronounced weaknesses based on currently existing facts, conditions, and values to a point where collection or liquidation for full repayment is highly questionable and improbable. Doubtful loans are required to be placed on non-accrual status and are assigned specific loss exposure.

Loans not meeting the criteria above that are analyzed individually as part of the above-described process are considered pass-rated loans.

The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale for the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	182.1	$	845.0	$	737.0	$	517.2	$	344.9	$	1,023.6	$	67.6	$	3,717.4
Special mention	—		33.4		5.9		21.6		34.0		37.1		—		132.0
Substandard	3.7		21.5		25.5		49.8		36.8		27.8		23.8		188.9
Doubtful	—		0.3		—		—		—		—		—		0.3
Total	$	185.8	$	900.2	$	768.4	$	588.6	$	415.7	$	1,088.5	$	91.4	$	4,038.6
Commercial real estate owner occupied:
Pass	$	189.4	$	843.8	$	585.4	$	336.9	$	220.4	$	585.0	$	54.7	$	2,815.6
Special mention	0.7		3.2		4.2		8.5		7.9		15.7		0.1		40.3
Substandard	6.8		6.1		4.2		6.3		15.4		22.0		0.2		61.0
Doubtful	—		—		—		—		1.8		2.0		—		3.8
Total	$	196.9	$	853.1	$	593.8	$	351.7	$	245.5	$	624.7	$	55.0	$	2,920.7

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial multi-family:
Pass	$	86.2	$	218.9	$	194.7	$	62.2	$	45.5	$	141.1	$	4.7	$	753.3
Special mention	—		—		—		—		—		0.1		—		0.1
Substandard	—		—		37.7		1.2		47.2		0.3		—		86.4
Doubtful	—		—		6.6		—		—		—		—		6.6
Total	$	86.2	$	218.9	$	239.0	$	63.4	$	92.7	$	141.5	$	4.7	$	846.4
Land, acquisition and development:
Pass	$	25.3	$	175.2	$	43.4	$	28.8	$	16.2	$	37.5	$	13.2	$	339.6
Special mention	—		—		0.1		—		0.2		0.4		—		0.7
Substandard	—		0.7		0.2		—		—		0.4		—		1.3
Doubtful	—		3.2		—		—		—		—		—		3.2
Total	$	25.3	$	179.1	$	43.7	$	28.8	$	16.4	$	38.3	$	13.2	$	344.8
Residential construction:
Pass	$	29.7	$	165.4	$	6.7	$	10.3	$	0.8	$	6.4	$	185.9	$	405.2
Substandard	—		—		0.4		—		—		0.4		—		0.8
Total	$	29.7	$	165.4	$	7.1	$	10.3	$	0.8	$	6.8	$	185.9	$	406.0
Commercial construction:
Pass	$	118.2	$	353.6	$	201.4	$	161.6	$	6.6	$	0.6	$	0.4	$	842.4
Substandard	—		—		—		2.4		—		—		—		2.4
Total	$	118.2	$	353.6	$	201.4	$	164.0	$	6.6	$	0.6	$	0.4	$	844.8
Agricultural real estate:
Pass	$	44.2	$	220.5	$	132.1	$	76.7	$	59.7	$	131.8	$	56.2	$	721.2
Special mention	—		7.1		2.8		1.2		12.7		7.6		10.0		41.4
Substandard	0.8		18.1		5.4		5.0		20.0		17.8		—		67.1
Doubtful	—		0.2		1.2		—		—		2.5		—		3.9
Total	$	45.0	$	245.9	$	141.5	$	82.9	$	92.4	$	159.7	$	66.2	$	833.6
Commercial and floor plans:
Pass	$	142.4	$	582.5	$	282.5	$	169.5	$	162.9	$	233.4	$	818.5	$	2,391.7
Special mention	—		4.1		0.6		1.1		1.3		3.0		18.1		28.2
Substandard	9.2		7.6		5.1		2.2		5.4		8.8		16.1		54.4
Doubtful	—		—		—		—		—		3.3		0.2		3.5
Total	$	151.6	$	594.2	$	288.2	$	172.8	$	169.6	$	248.5	$	852.9	$	2,477.8
Commercial purpose secured by 1-4 family:
Pass	$	48.0	$	152.9	$	78.0	$	37.6	$	35.5	$	53.3	$	15.5	$	420.8
Special mention	—		0.2		0.6		0.6		2.0		0.7		—		4.1
Substandard	0.1		1.3		1.2		0.7		0.5		1.5		0.1		5.4
Total	$	48.1	$	154.4	$	79.8	$	38.9	$	38.0	$	55.5	$	15.6	$	430.3
Agricultural:
Pass	$	25.9	$	137.5	$	40.6	$	15.1	$	12.3	$	9.5	$	396.4	$	637.3
Special mention	0.4		3.1		0.7		1.2		2.7		0.3		17.9		26.3
Substandard	1.8		25.8		6.8		0.9		4.4		1.1		34.8		75.6
Doubtful	—		—		—		—		2.5		0.9		—		3.4
Total	$	28.1	$	166.4	$	48.1	$	17.2	$	21.9	$	11.8	$	449.1	$	742.6

	December 31, 2021
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2021		2020		2019		2018		2017		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	507.9	$	452.2	$	237.9	$	150.4	$	76.3	$	409.0	$	15.3	$	1,849.0
Special mention	0.2		3.1		2.1		—		—		3.6		—		9.0
Substandard	3.9		15.3		2.3		0.7		1.0		12.4		—		35.6
Total	$	512.0	$	470.6	$	242.3	$	151.1	$	77.3	$	425.0	$	15.3	$	1,893.6
Commercial real estate owner occupied:
Pass	$	452.7	$	314.9	$	235.0	$	151.0	$	94.5	$	322.5	$	14.2	$	1,584.8
Special mention	1.3		3.2		1.5		7.4		3.5		13.8		—		30.7
Substandard	3.8		4.3		4.7		5.4		2.7		20.3		—		41.2
Total	$	457.8	$	322.4	$	241.2	$	163.8	$	100.7	$	356.6	$	14.2	$	1,656.7
Commercial multi-family:
Pass	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Total	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Land, acquisition and development:
Pass	$	113.0	$	41.5	$	34.2	$	14.8	$	19.8	$	20.8	$	1.2	$	245.3
Special mention	—		0.1		—		—		0.1		0.3		—		0.5
Substandard	0.8		0.2		—		0.6		0.3		0.1		—		2.0
Total	$	113.8	$	41.8	$	34.2	$	15.4	$	20.2	$	21.2	$	1.2	$	247.8
Residential construction:
Pass	$	112.4	$	7.0	$	13.7	$	0.9	$	—	$	—	$	127.2	$	261.2
Substandard	—		0.4		—		—		0.4		—		—		0.8
Total	$	112.4	$	7.4	$	13.7	$	0.9	$	0.4	$	—	$	127.2	$	262.0
Commercial construction:
Pass	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Total	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Agricultural real estate:
Pass	$	58.3	$	36.9	$	35.1	$	22.6	$	11.8	$	28.1	$	4.9	$	197.7
Special mention	0.1		1.3		1.2		0.1		0.1		0.9		0.9		4.6
Substandard	4.0		0.4		1.0		0.6		1.3		4.3		—		11.6
Total	$	62.4	$	38.6	$	37.3	$	23.3	$	13.2	$	33.3	$	5.8	$	213.9
Commercial and floor plans:
Pass	$	394.2	$	165.7	$	94.5	$	73.5	$	47.1	$	91.3	$	224.7	$	1,091.0
Special mention	0.8		11.4		0.8		0.8		3.0		2.3		7.0		26.1
Substandard	1.3		2.8		1.6		2.6		0.6		4.1		2.6		15.6
Total	$	396.3	$	179.9	$	96.9	$	76.9	$	50.7	$	97.7	$	234.3	$	1,132.7
Commercial purpose secured by 1-4 family:
Pass	$	94.9	$	55.0	$	27.8	$	23.1	$	15.3	$	32.2	$	14.4	$	262.7
Special mention	—		0.2		0.2		0.5		0.1		0.6		—		1.6
Substandard	1.3		1.2		0.6		0.6		0.2		1.3		0.1		5.3
Total	$	96.2	$	56.4	$	28.6	$	24.2	$	15.6	$	34.1	$	14.5	$	269.6
Agricultural:
Pass	$	35.1	$	16.2	$	9.0	$	5.4	$	2.1	$	1.6	$	108.9	$	178.3
Special mention	0.2		4.1		0.1		0.4		0.6		0.3		7.0		12.7
Substandard	4.9		0.7		0.6		2.5		—		0.1		2.6		11.4
Total	$	40.2	$	21.0	$	9.7	$	8.3	$	2.7	$	2.0	$	118.5	$	202.4

The Company evaluates the credit quality, loan performance, and the allowance for credit losses of its residential and consumer loan portfolios based primarily on the aging status of the loan and borrower payment activity. Accordingly, loans on nonaccrual status, loans past due 90 days or more and still accruing interest, and loans modified under troubled debt restructurings are considered nonperforming for purposes of credit quality evaluation. The following tables present the recorded investment of our other loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Residential 1-4 family:
Performing	$	34.5	$	446.5	$	581.5	$	112.5	$	35.5	$	260.3	$	0.9	$	1,471.7
Nonperforming	—		—		0.1		0.3		0.3		3.8		—		4.5
Total	$	34.5	$	446.5	$	581.6	$	112.8	$	35.8	$	264.1	$	0.9	$	1,476.2
Consumer home equity and HELOC:
Performing	$	4.6	$	16.5	$	10.6	$	5.8	$	6.9	$	19.5	$	454.8	$	518.7
Nonperforming	—		0.5		0.2		0.2		0.1		1.1		0.5		2.6
Total	$	4.6	$	17.0	$	10.8	$	6.0	$	7.0	$	20.6	$	455.3	$	521.3
Consumer indirect:
Performing	$	78.4	$	251.6	$	187.0	$	94.4	$	54.9	$	71.3	$	—	$	737.6
Nonperforming	—		0.5		0.5		0.3		0.2		0.5		—		2.0
Total	$	78.4	$	252.1	$	187.5	$	94.7	$	55.1	$	71.8	$	—	$	739.6
Consumer direct and advance line:
Performing	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5
Total	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5

	December 31, 2021
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2021		2020		2019		2018		2017		Prior		Revolving Loans Amortized Cost Basis		Total
Residential 1-4 family:
Performing	$	360.9	$	477.0	$	74.7	$	27.5	$	25.7	$	176.5	$	—	$	1,142.3
Nonperforming	—		0.3		—		—		0.2		0.8		—		1.3
Total	$	360.9	$	477.3	$	74.7	$	27.5	$	25.9	$	177.3	$	—	$	1,143.6
Consumer home equity and HELOC:
Performing	$	11.1	$	7.0	$	3.7	$	4.8	$	3.6	$	12.0	$	350.7	$	392.9
Nonperforming	0.3		—		0.3		—		0.6		0.5		—		1.7
Total	$	11.4	$	7.0	$	4.0	$	4.8	$	4.2	$	12.5	$	350.7	$	394.6
Consumer indirect:
Performing	$	272.6	$	208.6	$	108.3	$	64.0	$	37.0	$	45.0	$	—	$	735.5
Nonperforming	0.5		0.5		0.4		0.2		0.1		0.4		—		2.1
Total	$	273.1	$	209.1	$	108.7	$	64.2	$	37.1	$	45.4	$	—	$	737.6
Consumer direct and advance line:
Performing	$	42.5	$	27.9	$	15.0	$	13.3	$	5.8	$	7.6	$	16.9	$	129.0
Nonperforming	0.1		—		—		0.1		—		—		—		0.2
Total	$	42.6	$	27.9	$	15.0	$	13.4	$	5.8	$	7.6	$	16.9	$	129.2

While the Company considers the performance of the loan portfolio on the allowance for credit losses, for certain credit card loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity of the credit card holder. The following table presents the recorded investment in credit card loans based on payment activity for the periods indicated:

As of March 31, 2022	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	73.1	$	109.5	$	1.8	$	184.4
Nonperforming	0.4		0.3		—		0.7
Total credit card	$	73.5	$	109.8	$	1.8	$	185.1

As of December 31, 2021	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	64.4	$	73.1	$	1.5	$	139.0
Nonperforming	0.5		0.1		—		0.6
Total credit card	$	64.9	$	73.2	$	1.5	$	139.6

In the normal course of business, there were no material purchases of portfolio loans and no material sales of loans held for investment during the three months ended March 31, 2022 or 2021.

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Other Real Estate Owned

3 Months Ended

Mar. 31, 2022

Repossessed Assets [Abstract]

Other Real Estate Owned

Other Real Estate Owned

Other real estate owned is a category of real estate owned by the Company as a result of a default by the borrower. Information with respect to the Company’s other real estate owned is reflected in the following table:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	2.0	$	2.5
OREO acquired through acquisition	15.8		—
Additions	—		0.3
Dispositions	(0.3)		(0.6)
Ending balance	$	17.5	$	2.2

The carrying value of foreclosed residential real estate properties included in other real estate owned was $0.2 million as of March 31, 2022 and $0.2 million as of December 31, 2021. The Company had recorded investments in consumer mortgage loans secured by residential real estate for which formal foreclosure proceedings were in process of foreclosure of $0.4 million and $0.2 million as of March 31, 2022 and December 31, 2021, respectively.

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Capital Stock

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Capital Stock

Capital Stock

On March 25, 2022, all outstanding shares of the Company’s Class B common stock automatically converted into shares of the Company’s Class A common stock on a one-for-one basis, pursuant to the terms of the Company’s Third Amended and Restated Articles of Incorporation, as amended (the “Charter”). No additional shares of Class B common stock are permitted to be issued. The conversion occurred automatically pursuant to the Company’s Charter because the number of the Company’s outstanding shares of Class B common stock represented on March 25, 2022, the record date for determining the shareholders of the Company entitled to notice of, and to vote at, the Company’s upcoming 2022 Annual Meeting of Shareholders, was less than twenty percent (20%) of the aggregate number of all of the outstanding shares of Class A common stock and Class B common stock of the Company. The former holders of Class B common stock now hold Class A common stock with the same voting powers, preferences, rights and qualifications, limitations and restrictions as the other holders of Class A common stock. All shares of the Company’s outstanding capital stock are now composed solely of shares of Class A common stock and are entitled to one vote per share. The Company’s Class A common stock will continue to trade on the NASDAQ Stock Market under the ticker symbol “FIBK”

The Company had 109,503,010 shares of Class A common stock outstanding as of March 31, 2022. The Company had 41,699,409 shares of Class A common stock and 20,501,047 shares of Class B common stock outstanding as of December 31, 2021.

On February 1, 2022, the Company issued 46,879,601 shares of its Class A common stock with an aggregate value of approximately $1.7 billion as consideration for the acquisition of Great Western. During the three months ended March 31, 2022 and 2021, the Company also issued 7,503 shares and 604 shares, respectively, of its Class A common stock to directors for their annual service on the Company's board of directors. The aggregate value of the shares issued to directors is included in employee benefits in the consolidated statement of income and in stock-based compensation expense in the consolidated statements of changes in stockholders' equity.

On June 11, 2019, the Company’s board of directors adopted a stock repurchase program pursuant to which the Company may repurchase up to 2.5 million of its outstanding shares of Class A common stock. On September 12, 2020, the Company’s board of directors increased the number of shares of Class A common stock authorized to be repurchased by the Company under the stock repurchase program by an additional 3.0 million shares for a total of 5.5 million shares. There were no shares repurchased under the program during the three months ended March 31, 2022. During the three months ended March 31, 2021, the Company repurchased and retired 72,700 shares of our Class A common stock at a total cost of $2.9 million, including costs and commissions, at an average cost of $39.69 per share. The shares of common stock repurchased during the period represented 1.3% of the total 5.5 million shares authorized to be repurchased. As of March 31, 2022, there were 1.9 million shares remaining authorized under the repurchase program.

All other stock repurchases during the three months ended March 31, 2022 and 2021, were redemptions of vested restricted shares tendered in lieu of cash for payment of income tax withholding amounts by participants in the Company’s equity compensation plans.

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Earnings per Common Share

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Earnings per Common Share

Earnings per Common Share

Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period presented, excluding unvested restricted stock. Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares determined for the basic earnings per share computation plus the dilutive effects of stock-based compensation using the treasury stock method.

The following table sets forth the computation of basic and diluted earnings per share for the periods presented:

	Three Months Ended March 31,
	2022		2021
Net (loss) income	$	(33.4)	$	51.4
Weighted average common shares outstanding for basic earnings per share computation	92,855,173		61,591,877
Dilutive effects of stock-based compensation	—		122,186
Weighted average common shares outstanding for diluted earnings per common share computation	92,855,173		61,714,063
Basic (loss) earnings per common share	$	(0.36)	$	0.83
Diluted (loss) earnings per common share	$	(0.36)	$	0.83
Anti-dilutive unvested time restricted stock	55,504		92,602

The Company had 537,374 and 368,793 shares of unvested restricted stock as of March 31, 2022 and 2021, respectively, that were not included in the computation of diluted earnings per common share because performance conditions for vesting had not been met. As a result of incurring a net loss during the three months ended March 31, 2022, potential common shares of 71,379 were excluded from diluted loss per share because the effect would have been anti-dilutive.

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Regulatory Capital

3 Months Ended

Mar. 31, 2022

Banking and Thrift, Other Disclosures [Abstract]

Regulatory Capital

Regulatory Capital

As of March 31, 2022 and December 31, 2021, the Company exceeded all capital adequacy requirements to which it is subject. Actual capital amounts and ratios for the Company and its subsidiary Bank, as of March 31, 2022 and December 31, 2021 are presented in the following tables: 

	Actual				Minimum Required for Capital Adequacy Purposes				For Capital Adequacy Purposes Plus Capital Conservation Buffer				Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
March 31, 2022	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital:
Consolidated	$	2,930.9	14.27	%	$	1,643.5	8.00	%	$	2,157.1	10.50	%	$	2,054.4	10.00	%
FIB	2,787.3		13.61		1,638.3		8.00		2,150.2		10.50		2,047.9		10.00
Tier 1 risk-based capital:
Consolidated	2,446.7		11.91		1,232.6		6.00		1,746.2		8.50		1,643.5		8.00
FIB	2,560.7		12.50		1,228.7		6.00		1,740.7		8.50		1,638.3		8.00
Common equity tier 1 risk-based capital:
Consolidated	2,446.7		11.91		924.5		4.50		1,438.1		7.00		1,335.3		6.50
FIB	2,560.7		12.50		921.5		4.50		1,433.5		7.00		1,331.1		6.50
Leverage capital ratio:
Consolidated	2,446.7		8.96		1,091.7		4.00		1,091.7		4.00		1,364.6		5.00
FIB	2,560.7		9.36		1,093.8		4.00		1,093.8		4.00		1,367.2		5.00

	Actual				Minimum Required for Capital Adequacy Purposes				For Capital Adequacy Purposes Plus Capital Conservation Buffer				Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
December 31, 2021	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital:
Consolidated	$	1,659.3	14.11	%	$	940.9	8.00	%	$	1,235.0	10.50	%	$	1,176.2	10.00	%
FIB	1,472.5		12.56		938.0		8.00		1,231.1		10.50		1,172.5		10.00
Tier 1 risk-based capital:
Consolidated	1,469.0		12.49		705.7		6.00		999.7		8.50		940.9		8.00
FIB	1,382.2		11.79		703.5		6.00		996.6		8.50		938.0		8.00
Common equity tier 1 risk-based capital:
Consolidated	1,384.8		11.77		529.3		4.50		823.3		7.00		764.5		6.50
FIB	1,382.2		11.79		527.6		4.50		820.8		7.00		762.1		6.50
Leverage capital ratio:
Consolidated	1,469.0		7.68		765.5		4.00		765.5		4.00		956.9		5.00
FIB	1,382.2		7.24		764.1		4.00		764.1		4.00		955.1		5.00

(1) The ratios to meet the requirements to be deemed “well-capitalized” are only applicable to FIB. However, the Company manages its capital position as if the requirements apply to the consolidated company and has presented the ratios as if they also applied on a consolidated basis.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

In the normal course of business, the Company is involved in various claims and litigation. The Company establishes accruals for legal matters when potential losses associated with the actions become probable and the amount of loss can be reasonably estimated. There is no assurance that the ultimate resolution of these matters will not significantly exceed the amounts that the Company has accrued. Accruals for legal matters are based on management’s best judgment after consultation with counsel and others. In the opinion of management, following consultation with legal counsel, the ultimate liability or disposition of all such claims and litigation is not expected to have a material adverse effect on the consolidated financial condition, results of operations, or liquidity of the Company.

As of March 31, 2022, the Company had commitments under construction contracts of $6.7 million.

Residential mortgage loans sold to investors in the secondary market are sold with varying recourse provisions. Essentially all the loan sales agreements require the repurchase of a mortgage loan by the seller in situations such as breach of representation, warranty, or covenant; untimely document delivery; false or misleading statements; failure to obtain certain certificates or insurance; or unmarketability. Certain loan sales agreements contain repurchase requirements based on payment-related defects that are defined in terms of the number of days or months since the purchase, the sequence number of the payment, and/or the number of days of payment delinquency. Based on the

specific terms stated in the agreements, the Company had $0.8 million of sold residential mortgage loans with recourse provisions still in effect as of March 31, 2022.

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Financial Instruments with Off-Balance Sheet Risk

3 Months Ended

Mar. 31, 2022

Financial Instruments with Off-Balance Sheet Risk [Abstract]

Financial Instruments with Off-Balance Sheet Risk

Financial Instruments with Off-Balance Sheet Risk

In the normal course of business, the Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its clients. These financial instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of amounts recorded in the consolidated balance sheets. Commitments to extend credit are agreements to lend to a client so long as there is no violation of any condition established in the commitment contract. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a client to a third party. The credit risk involved in issuing letters of credit is essentially the same as the credit risk involved in extending loan facilities to clients. The Company’s policy for obtaining collateral, and determining the nature of such collateral, is essentially the same as in the Company’s policies for making commitments to extend credit. The estimated fair value of the obligation undertaken by the Company in issuing standby letters of credit is included in accounts payable and accrued expenses in the Company’s consolidated balance sheets.    

The following table presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	3.8	$	3.7
Provision for (reversal of) credit loss expense	2.4		(0.3)
Ending balance of allowance for off-balance sheet credit losses	$	6.2	$	3.4

	March 31, 2022		December 31, 2021
Unused credit card lines	$	819.0	$	681.6
Commitments to extend credit	4,899.4		2,539.8
Standby letter of credit	100.2		57.5

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Other Comprehensive Income/Loss

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Other Comprehensive Income/Loss

Other Comprehensive Loss

The gross amounts of each component of other comprehensive loss and the related tax effects are as follows:

	Pre-tax				Tax Expense (Benefit)				Net of Tax
Three Months Ended March 31,	2022		2021		2022		2021		2022		2021
Investment securities available-for sale:
Change in net unrealized loss during period	$	(252.6)	$	(66.8)	$	(62.7)	$	(17.0)	$	(189.9)	$	(49.8)
Reclassification adjustment for net loss included in net income	0.1		—		—		—		0.1		—
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	0.2		—		0.1		—		0.1		—
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity	(23.0)		—		(5.7)		—		(17.3)		—
Change in net unrealized loss (gain) on derivatives	21.3		(0.1)		5.3		—		16.0		(0.1)
Total other comprehensive loss	$	(254.0)	$	(66.9)	$	(63.0)	$	(17.0)	$	(191.0)	$	(49.9)

The components of accumulated other comprehensive loss, net of related tax effects, are as follows:

	March 31, 2022		December 31, 2021
Net unrealized loss on investment securities available-for-sale	$	(218.1)	$	(29.0)
Net unrealized (loss) gain on investment securities transferred to held-to-maturity	(2.9)		15.0
Net unrealized gain on derivatives	19.0		3.0
Net accumulated other comprehensive loss	$	(202.0)	$	(11.0)

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Fair Value Measurements

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements        

Fair value is defined as the price that would be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The three levels of inputs that may be used to measure fair value are as follows:

•Level 1 - Quoted prices in active markets for identical assets or liabilities

•Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities

•Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of assets or liabilities

The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date, and therefore are classified within Level 2 of the valuation hierarchy. There have been no significant changes in the valuation techniques during the three months ended March 31, 2022 and 2021.

The Company’s policy is to recognize transfers between levels as of the end of the reporting period. Transfers in and out of Level 1, Level 2, and Level 3 are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the three months ended March 31, 2022 and 2021.

Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below:

Investment Debt Securities Available-for-Sale. The Company obtains fair value measurements for investment securities from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. If needed, a broker may be utilized to determine the reported fair value of investment securities.

Loans Held for Sale. Fair value measurements for residential mortgage loans held for sale are obtained from an independent pricing service. The fair value measurements consider observable data that may include binding contracts or quotes or bids from third party investors as well as loan level pricing adjustments. Commercial and agricultural loans held for sale are derived from quotes or bids from third party investors.

Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data. The inputs used to determine fair value include the three-month LIBOR forward curve to estimate variable rate cash inflows and the federal funds effective swap rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The change in the value of derivative assets attributable to basis risk, or the risk that offsetting investments in a hedging strategy will not experience price changes in entirely opposite directions from each other, was not significant in the reported periods. The Company also obtains and compares the reasonableness of the pricing from an independent third party.

For purposes of potential valuation adjustments to our derivative positions, we evaluate the credit risk of our counterparties as well as ours. Accordingly, we have considered factors such as the likelihood of our default and the default of our counterparties, our net exposures and remaining contractual life, among other things, in determining if any fair value adjustments related to credit risk are required. The change in value of derivative assets and derivative liabilities attributable to credit risk was not significant during the reported periods.

Interest Rate Lock Commitments. Fair value measurements for interest rate lock commitments are obtained from an independent pricing service. The fair value measurements consider observable data that may include prices available from secondary market investors taking into consideration various characteristics of the loan, including the loan amount, interest rate, value of the servicing, and loan to value ratio, among other things. Observable data is then adjusted to reflect changes in interest rates, the Company’s estimated pull-through rate, and estimated direct costs necessary to complete the commitment into a closed loan net of origination and processing fees collected from the borrower.

Forward Loan Sales Contracts. The fair value measurements for forward loan sales contracts are obtained from an independent pricing service. The fair value measurements consider observable data that includes sales of similar loans.

Deferred Compensation Plan Assets and Liabilities. The fair values of deferred compensation plan assets and liabilities are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. These investments are in the same funds and purchased in the same amounts as the participants’ selected investments, which represent the underlying liabilities to plan participants. Deferred compensation plan liabilities are recorded at amounts due to participants, based on the fair value of participants’ selected investments.

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:
U.S. Treasury notes	$	644.9	$	644.9	$	—	$	—
State, county, and municipal securities	292.7			—	292.7			—
Obligations of U.S. government agencies	137.9			—	137.9			—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	3,645.7			—	3,645.7			—
Private mortgage-backed securities	274.8			—	274.8			—
Collateralized loan obligations	1,070.9			—	1,070.9			—
Corporate securities	216.9			—	216.9			—
Loans held for sale	178.1			—	178.1			—
Derivative assets:
Interest rate swap contracts	25.6			—	25.6			—
Forward loan sale contracts	1.3			—	1.3			—
Derivative liabilities:
Interest rate swap contracts	62.3			—	62.3			—
Risk participation agreements	0.4			—	0.4			—
Deferred compensation plan assets	19.7			—	19.7			—
Deferred compensation plan liabilities	19.7			—	19.7			—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:
U.S. Treasury notes	$	684.7	$	684.7	$	—	$	—
State, county and municipal securities	$	427.5	$	—	427.5		$	—
Obligations of U.S. government agencies	346.9			—	346.9			—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	2,018.1			—	2,018.1			—
Private mortgage-backed securities	173.4			—	173.4			—
Collateralized loan obligations	899.4			—	899.4			—
Corporate securities	270.5			—	270.5			—
Loans held for sale	30.1			—	30.1			—
Derivative assets:
Interest rate swap contracts	26.3			—	26.3			—
Interest rate lock commitments	1.8			—	1.8			—
Derivative liabilities
Interest rate swap contracts	18.2			—	18.2			—
Deferred compensation plan assets	21.4			—	21.4			—
Deferred compensation plan liabilities	21.4			—	21.4			—

Additionally, from time to time, certain assets are measured at fair value on a non-recurring basis. Adjustments to fair value generally result from the application of lower-of-cost-or-market accounting or write-downs of individual assets due to credit deterioration. The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis:

				Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Collateral dependent loans	$	101.1	$	—	$	—	$	101.1
Other real estate owned	17.5			—		—	17.5
Long-lived assets to be disposed of by sale	1.5			—		—	1.5
				Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Collateral dependent loans	$	11.7	$	—	$	—	$	11.7
Other real estate owned	2.0			—		—	2.0
Long-lived assets to be disposed of by sale	1.3			—		—	1.3

Collateral-dependent Loans. Collateral-dependent loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. The collateral-dependent loans are reported at fair value through specific valuation allowance allocations. In addition, when it is determined that the fair value of a collateral-dependent loan is less than the recorded investment in the loan, the carrying value of the loan is adjusted to fair value through a charge to the allowance for credit losses. Collateral values are estimated using independent appraisals and management estimates of current market conditions. As of March 31, 2022 and December 31, 2021, the Company had collateral-dependent loans with a carrying and fair value of $101.1 million and $11.7 million, respectively.

OREO. The fair values of OREO are estimated using independent appraisals and management estimates of current market conditions. Upon initial recognition, write-downs based on the foreclosed asset’s fair value at foreclosure are reported through charges to the allowance for credit losses. Periodically, the fair value of foreclosed assets is remeasured with any subsequent write-downs charged to OREO expense in the period in which they are identified. The Company had no material write downs on OREO properties during the three months ended March 31, 2022 and 2021, respectively.

Long-lived Assets to be Disposed of by Sale. Long-lived assets to be disposed of by sale are carried at the lower of carrying value or fair value less estimated costs to sell. The fair values of long-lived assets to be disposed of by sale are based upon observable market data and management estimates of current market conditions. As of March 31, 2022, the Company had long-lived assets to be disposed of by sale with carrying and fair values aggregating $1.5 million, with no write-downs charged to other expense. As of December 31, 2021, the Company had long-lived assets to be disposed of by sale with carrying and fair values aggregating $1.3 million, with no write-downs charged to other expense.         

The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:

	Fair Value As of
	March 31, 2022		December 31, 2021		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Collateral dependent loans	$	101.1	$	11.7	Appraisal	Appraisal adjustment	1%	-	18%	(7%)
Other real estate owned	17.5		2.0		Appraisal	Appraisal adjustment	0%	-	0%	0%
Long-lived assets to be disposed of by sale	1.5		1.3		Appraisal	Appraisal adjustment	0%	-	0%	0%

The Company is required to disclose the fair value of financial instruments for which it is practical to estimate fair value. The methodologies for estimating the fair value of financial instruments that are measured at fair value on a recurring or non-recurring basis are discussed above. The methodologies for estimating the fair value of other financial instruments are discussed below. For financial instruments bearing a variable interest rate where no credit risk exists, it is presumed that recorded book values are reasonable estimates of fair value.        

Financial Assets. Carrying values of cash, cash equivalents, and accrued interest receivable approximate fair values due to the liquid and/or short-term nature of these instruments. Fair values for investment securities held-to-maturity are obtained from an independent pricing service, which considers observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Fair values of fixed rate loans and variable rate loans that reprice on an infrequent basis are estimated by discounting future cash flows using current interest rates at which similar loans with similar terms would be made to borrowers of similar credit quality using an exit price notion. Carrying values of variable rate loans that reprice frequently, and with no change in credit risk, approximate the fair values of these instruments.

Financial Liabilities. The fair values of demand deposits, savings accounts, securities sold under repurchase agreements, and accrued interest payable are the amounts that are payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using external market rates that are currently offered for deposits that have similar remaining maturities. The fair values of derivative liabilities are obtained from an independent pricing service, which considers observable data that may include the three-month LIBOR forward curve, the federal funds effective swap rate and cash flows, among other things. The carrying values of the interest-bearing demand notes to the United States Treasury are deemed an approximation of fair values due to the frequent repayment and repricing at market rates. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, notes payable to the FHLB, fixed rate subordinated term debt, and capital lease obligation are estimated by discounting future cash flows using current rates for advances that have similar characteristics.

Commitments to Extend Credit and Standby Letters of Credit. The fair value of commitments to extend credit and standby letters of credit, based on fees currently charged to enter into similar agreements, is not significant.    

The estimated fair values of financial instruments that are reported in the Company’s consolidated balance sheets, and are segregated by the level of the valuation inputs within the fair value hierarchy that are utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	3,811.3	$	3,811.3	$	3,811.3	$	—	$	—
Securities purchased under agreement to resell	102.0		102.0		—		102.0		—
Investment debt securities available-for-sale	6,283.8		6,283.8		644.9		5,638.9		—
Investment debt securities held-to-maturity	3,218.7		3,029.1		296.2		2,732.9		—
Accrued interest receivable	81.1		81.1		—		81.1		—
Mortgage servicing rights, net	32.7		35.8		—		35.8		—
Loans held for sale	178.1		178.1		—		178.1		—
Net loans held for investment	16,697.8		16,676.6		—		16,575.5		101.1
Derivative assets	26.9		26.9		—		26.9		—
Deferred compensation plan assets	19.7		19.7		—		19.7		—
Total financial assets	$	30,452.1	$	30,244.4	$	4,752.4	$	25,390.9	$	101.1
Financial liabilities:
Total deposits, excluding time deposits	$	26,489.9	$	26,489.9	$	26,489.9	$	—	$	—
Time deposits	1,598.4		1,579.8		—		1,579.8		—
Securities sold under repurchase agreements	1,071.0		1,071.0		—		1,071.0		—
Accrued interest payable	6.0		6.0		—		6.0		—
Long-term debt	120.4		122.8		—		122.8		—
Subordinated debentures held by subsidiary trusts	163.1		162.3		—		162.3		—
Derivative liabilities	62.7		62.7		—		62.7		—
Deferred compensation plan liabilities	19.7		19.7		—		19.7		—
Total financial liabilities	$	29,531.2	$	29,514.2	$	26,489.9	$	3,024.3	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	2,344.8	$	2,344.8	$	2,344.8	$	—	$	—
Investment debt securities available-for-sale	4,820.5		4,820.5		684.7		4,135.8		—
Investment debt securities held-to-maturity	1,687.6		1,667.5		—		1,667.5		—
Accrued interest receivable	47.4		47.4		—		47.4		—
Mortgage servicing rights, net	28.2		28.2		—		28.2		—
Loans held for sale	30.1		30.1		—		30.1		—
Net loans held for investment	9,209.4		9,254.3		—		9,242.6		11.7
Derivative assets	28.1		28.1		—		28.1		—
Deferred compensation plan assets	21.4		21.4		—		21.4		—
Total financial assets	$	18,217.5	$	18,242.3	$	3,029.5	$	15,201.1	$	11.7
Financial liabilities:
Total deposits, excluding time deposits	$	15,303.1	$	15,303.1	$	15,303.1	$	—	$	—
Time deposits	966.5		963.1		—		963.1		—
Securities sold under repurchase agreements	1,051.1		1,051.1		—		1,051.1		—
Accrued interest payable	3.7		3.7		—		3.7		—
Long-term debt	112.4		120.7		—		120.7		—
Subordinated debentures held by subsidiary trusts	87.0		85.5		—		85.5		—
Derivative liabilities	18.2		18.2		—		18.2		—
Deferred compensation plan liabilities	21.4		21.4		—		21.4		—
Total financial liabilities	$	17,563.4	$	17,566.8	$	15,303.1	$	2,263.7	$	—

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Recent Authoritative Accounting Guidance	3 Months Ended
	Mar. 31, 2022
Accounting Policies [Abstract]
Recent Authoritative Accounting Guidance	Recent Authoritative Accounting Guidance

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Subsequent Events

3 Months Ended

Mar. 31, 2022

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Subsequent events have been evaluated for potential recognition and disclosure through the date the Company’s financial statements were filed with the SEC. On April 27, 2022, the Company declared a quarterly dividend to common shareholders of $0.41 per share, to be paid on May 20, 2022 to shareholders of record as of May 10, 2022.

No other undisclosed events requiring recognition or disclosure were identified.

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Loans Held for Sale

3 Months Ended

Mar. 31, 2022

Loans Held for Sale [Abstract]

Loans Held for Sale

Loans Held for Sale

The following table presents loans held for sale by segment for the dates indicated:

	March 31, 2022		December 31, 2021
Loans Held for Sale:
Agricultural	$	132.1	$	—
Commercial	23.4		—
Residential real estate	22.6		30.1
Total loans held for sale	$	178.1	$	30.1

Residential real estate loans that the Company originated with the intent to sell are recorded at fair value. Conforming agency mortgage production is sold on a servicing retained basis. Certain loans, such as government guaranteed mortgage loans, are sold on a servicing released basis. The fair value of loans held for sale are primarily determined based on quoted prices for similar loans in active markets or outstanding commitments from third-party investors. Net unrealized losses, if any, are recorded as a valuation allowance and charged to non-interest income in the consolidated statements from operations. Net gains and losses on loan sales are recorded as a component of non-interest income.

As of March 31, 2022, loans held for sale included nonaccrual loans of $32.7 million, all of which were agricultural loans. There were no loans held for sale that were considered a troubled debt restructuring as of March 31, 2022.

On February 1, 2022, in conjunction with the acquisition of GWB, agricultural loans with a carrying value of $155.8 million and commercial loans with a carrying value of $24.0 million were reclassified as loans held for sale from loans held for investment due to management’s intent and decision to sell the loans.

During the period ended March 31, 2022, agricultural loans with a carrying value of $19.8 million were reclassified from loans held for sale to loans held for investment due to management’s change in intent and decision not to sell the loans. On the date of transfer, the amortized cost exceeded the fair value of the loans due to credit deterioration. The Company recorded a charge-off of $5.1 million to the allowance for credit losses, which established a new aggregate cost basis for the loans of $14.7 million on the date of transfer.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fair Value Measurements

Fair Value Measurements        

Fair value is defined as the price that would be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The three levels of inputs that may be used to measure fair value are as follows:

•Level 1 - Quoted prices in active markets for identical assets or liabilities

•Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities

•Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of assets or liabilities

The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date, and therefore are classified within Level 2 of the valuation hierarchy. There have been no significant changes in the valuation techniques during the three months ended March 31, 2022 and 2021.

The Company’s policy is to recognize transfers between levels as of the end of the reporting period. Transfers in and out of Level 1, Level 2, and Level 3 are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the three months ended March 31, 2022 and 2021.

Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below:

Investment Debt Securities Available-for-Sale. The Company obtains fair value measurements for investment securities from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. If needed, a broker may be utilized to determine the reported fair value of investment securities.

Loans Held for Sale. Fair value measurements for residential mortgage loans held for sale are obtained from an independent pricing service. The fair value measurements consider observable data that may include binding contracts or quotes or bids from third party investors as well as loan level pricing adjustments. Commercial and agricultural loans held for sale are derived from quotes or bids from third party investors.

Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data. The inputs used to determine fair value include the three-month LIBOR forward curve to estimate variable rate cash inflows and the federal funds effective swap rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The change in the value of derivative assets attributable to basis risk, or the risk that offsetting investments in a hedging strategy will not experience price changes in entirely opposite directions from each other, was not significant in the reported periods. The Company also obtains and compares the reasonableness of the pricing from an independent third party.

For purposes of potential valuation adjustments to our derivative positions, we evaluate the credit risk of our counterparties as well as ours. Accordingly, we have considered factors such as the likelihood of our default and the default of our counterparties, our net exposures and remaining contractual life, among other things, in determining if any fair value adjustments related to credit risk are required. The change in value of derivative assets and derivative liabilities attributable to credit risk was not significant during the reported periods.

Interest Rate Lock Commitments. Fair value measurements for interest rate lock commitments are obtained from an independent pricing service. The fair value measurements consider observable data that may include prices available from secondary market investors taking into consideration various characteristics of the loan, including the loan amount, interest rate, value of the servicing, and loan to value ratio, among other things. Observable data is then adjusted to reflect changes in interest rates, the Company’s estimated pull-through rate, and estimated direct costs necessary to complete the commitment into a closed loan net of origination and processing fees collected from the borrower.

Forward Loan Sales Contracts. The fair value measurements for forward loan sales contracts are obtained from an independent pricing service. The fair value measurements consider observable data that includes sales of similar loans.

Deferred Compensation Plan Assets and Liabilities. The fair values of deferred compensation plan assets and liabilities are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. These investments are in the same funds and purchased in the same amounts as the participants’ selected investments, which represent the underlying liabilities to plan participants. Deferred compensation plan liabilities are recorded at amounts due to participants, based on the fair value of participants’ selected investments.

Recent Authoritative Accounting Guidance

Recent Authoritative Accounting Guidance

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Approximate Fair Values of Investment Securities

The amortized cost and the approximate fair values of investment securities are summarized as follows:

March 31, 2022	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-Sale:
U.S. Treasury notes	$	698.2	$	—	$	(53.3)	$	644.9
State, county, and municipal securities	320.3		0.2		(27.8)		292.7
Obligations of U.S. government agencies	144.6		—		(6.7)		137.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	3,816.4		1.1		(171.8)		3,645.7
Private mortgage-backed securities	288.4		—		(13.6)		274.8
Collateralized loan obligations	1,075.4		—		(4.5)		1,070.9
Corporate securities	231.8		0.5		(15.4)		216.9
Total	$	6,575.1	$	1.8	$	(293.1)	$	6,283.8

March 31, 2022	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held-to-Maturity:
U.S. Treasury notes	$	296.2	$	—	$	296.2	$	—	$	—	$	296.2
State, county, and municipal securities	197.3		(0.1)		197.2		0.8		(21.4)		176.6
Obligations of U.S. government agencies	340.8		—		340.8		—		(32.3)		308.5
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations (1)	2,302.0		—		2,302.0		18.2		(152.4)		2,167.8
Corporate securities	84.0		(1.5)		82.5		0.2		(2.7)		80.0
Total	$	3,220.3	$	(1.6)	$	3,218.7	$	19.2	$	(208.8)	$	3,029.1
(1) Amortized cost presented above include $21.8 million of unamortized losses and $17.9 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 and 2022 transfer of securities from available-for-sale to held-to-maturity.

December 31, 2021	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-Sale:
U.S. Treasury notes	$	697.6	$	—	$	(12.9)	$	684.7
State, county, and municipal securities	434.7		2.1		(9.3)		427.5
Obligations of U.S. government agencies	356.0		0.1		(9.2)		346.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	2,027.3		14.1		(23.3)		2,018.1
Private mortgage-backed securities	174.4		0.1		(1.1)		173.4
Collateralized loan obligation	898.2		1.2		—		899.4
Corporate securities	271.1		3.0		(3.6)		270.5
Total	$	4,859.3	$	20.6	$	(59.4)	$	4,820.5

December 31, 2021	Amortized Cost		Allowance for Credit Losses		Net Carrying Amount		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Held-to-Maturity:
State, county, and municipal securities	$	67.6	$	—	$	67.6	$	2.0	$	(0.4)	$	69.2
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations(1)	1,609.0		—		1,609.0		13.2		(35.3)		1,586.9
Corporate securities	11.0		—		11.0		0.4		—		11.4
Total	$	1,687.6	$	—	$	1,687.6	$	15.6	$	(35.7)	$	1,667.5
(1) Amortized cost presented above include $20.1 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 transfer of securities from available-for-sale to held-to-maturity.

Gross Unrealized Losses and Fair Values of Investment Securities

The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in an unrealized loss position as of March 31, 2022 and December 31, 2021.

	Less than 12 Months				12 Months or More				Total
March 31, 2022	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Available-for-Sale:
U.S. Treasury notes	$	644.9	$	(53.3)	$	—	$	—	$	644.9	$	(53.3)
State, county, and municipal securities	223.6		(22.7)		29.6		(5.1)		253.2		(27.8)
Obligations of U.S. government agencies	101.5		(5.4)		15.4		(1.3)		116.9		(6.7)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	3,238.5		(163.4)		84.9		(8.4)		3,323.4		(171.8)
Private mortgage-backed securities	274.8		(13.6)		—		—		274.8		(13.6)
Collateralized loan obligations	1,020.9		(4.5)		—		—		1,020.9		(4.5)
Corporate securities	146.7		(13.5)		19.3		(1.9)		166.0		(15.4)
Total	$	5,650.9	$	(276.4)	$	149.2	$	(16.7)	$	5,800.1	$	(293.1)

	Less than 12 Months				12 Months or More				Total
December 31, 2021	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Available-for-Sale:
U.S. Treasury notes	$	684.7	$	(12.9)	$	—	$	—	$	684.7	$	(12.9)
State, county, and municipal securities	278.7		(9.1)		5.0		(0.2)		283.7		(9.3)
Obligations of U.S. government agencies	297.0		(8.9)		16.4		(0.3)		313.4		(9.2)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations	1,262.8		(23.0)		26.4		(0.3)		1,289.2		(23.3)
Private mortgage-backed securities	127.2		(1.1)		—		—		127.2		(1.1)
Corporate securities	109.9		(3.3)		20.9		(0.3)		130.8		(3.6)
Total	$	2,760.3	$	(58.3)	$	68.7	$	(1.1)	$	2,829.0	$	(59.4)

Debt Securities, Held-to-maturity, Allowance for Credit Loss

The following table presents the activity in the allowance for credit losses related to held-to-maturity securities classified as corporate and state, county, and municipal securities:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	—	$	—
Provision for credit loss expense	1.6		—
Ending balance of allowance for credit losses	$	1.6	$	—

Maturities of Investment Securities

, the Company had variable rate mortgage-backed and corporate securities which had an amortized cost of $253.0 million and were classified as available-for-sale as of March 31, 2022. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.

	Available-for-Sale				Held-to-Maturity
March 31, 2022	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Within one year	$	926.6	$	886.6	$	377.1	$	355.3
After one year but within five years	2,724.4		2,592.0		1,334.1		1,274.0
After five years but within ten years	1,139.8		1,074.3		1,026.2		956.0
After ten years	1,784.3		1,730.9		482.9		443.8
Total	$	6,575.1	$	6,283.8	$	3,220.3	$	3,029.1

Debt Securities, Held-to-maturity, Credit Quality Indicator

The following table summarizes the credit quality indicators of held-to-maturity securities at amortized cost for the periods indicated:

March 31, 2022	AAA		AA		A		BBB		Not Rated		Total
U.S. Treasury notes	$	296.2	$	—	$	—	$	—	$	—	$	296.2
State, county, and municipal securities	72.6		102.7		13.7		—		8.3		197.3
Obligations of U.S. government agencies	340.8		—		—		—		—		340.8
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC	1,958.2		—		—		—		—		1,958.2
GNMA	343.8		—		—		—		—		343.8
Corporate securities	—		—		4.0		75.0		5.0		84.0
Total	$	3,011.6	$	102.7	$	17.7	$	75.0	$	13.3	$	3,220.3

December 31, 2021	AAA		AA		A		BBB		Not Rated		Total
State, county, and municipal securities	$	17.2	$	31.6	$	14.7	$	—	$	4.1	$	67.6
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC	1,439.1		—		—		—		—		1,439.1
GNMA	169.9		—		—		—		—		169.9
Corporate securities	—		—		4.0		7.0		—		11.0
Total	$	1,626.2	$	31.6	$	18.7	$	7.0	$	4.1	$	1,687.6

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2022

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table provides the provisional purchase price allocation as of the acquisition date and the Great Western assets acquired and liabilities assumed at their estimated fair value as of the acquisition date. We recorded the estimate of fair value based on initial valuations available at the acquisition date. The excess value of the consideration paid over the fair value of assets acquired and liabilities assumed was recorded as goodwill. The purchase price allocation resulted in provisional goodwill of $516.0 million, which is not deductible for income tax purposes. Goodwill resulting from the acquisition was allocated to the Company’s one operating segment, community banking, and consists largely of the synergies and economies of scale expected from combining the operations of Great Western and the Company. Due to the recent closing of the transaction, all amounts reported are provisional pending the review of valuations obtained from third parties.

As of February 1, 2022
Assets acquired:
Cash and cash equivalents	$	2,006.9
Investment securities	2,699.0
Securities purchased under agreement to resell	101.1
Loans held for sale	181.9
Loans held for investment	7,713.4
Allowance for credit losses	(84.3)
Premises and equipment, including right of use lease assets	144.1
Other real estate owned (“OREO”)	15.8
Company owned life insurance	186.6
Core deposit intangibles	49.1
Customer relationship intangible	22.8
Mortgage servicing rights	1.3
Deferred tax assets, net	76.1
Other assets	198.0
Total assets acquired	13,311.8
Liabilities assumed:
Deposits	11,688.0
Securities sold under repurchase agreements	74.0
Accrued expenses and other liabilities	107.1
FHLB advances	122.9
Subordinated debt	36.4
Subordinated debentures held by subsidiary trusts	76.1
Total liabilities assumed	12,104.5
Net assets acquired	$	1,207.3
Consideration paid:
Class A common stock	1,723.3
Total consideration paid (1)	$	1,723.3
Goodwill	$	516.0

(1) Includes $13 thousand of cash paid in lieu of fractional shares.

Schedule of Pro Forma Financial Information

The following table presents certain unaudited pro forma financial information for illustrative purposes only, for the three month periods ended March 31, 2022 and 2021 as if GWB had been acquired on January 1, 2021. This unaudited pro forma information combines the historical results of GWB with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition occurred at the beginning of the year prior to the acquisition. The unaudited pro forma information does not consider any changes to the provision for credit losses resulting from recording loan assets at fair value, cost savings, or business synergies. As a result, actual amounts would have differed from the unaudited pro forma information presented, and the differences could be significant.

	Three Months Ended March 31,
	2022		2021
Total revenues	$	268.9	$	321.6
Net income (loss)	$	76.4	$	(78.2)
Earnings (loss) per common share (Basic)	$	0.70	$	(0.72)
Earnings (loss) per common share (Diluted)	$	0.70	$	(0.72)

Financing Receivable, Purchased

The non-credit discount or premium, after the adjustment for the allowance for credit losses, is accreted to interest income using the interest method based on the effective interest rate determined after the adjustment for credit losses at the adoption date. Information regarding loans acquired at the acquisition date is as follows:

(In millions)
PCD loans:
Unpaid principal balance	$	979.2
Principal amounts previously written off by GWB	(238.7)
Interest applied to principal by GWB	(18.1)
Adjusted unpaid principal balance	722.4
Credit discount	(90.9)
Discount attributable to other factors	(24.6)
Fair value	606.9
Allowance for credit losses	84.3
Amortized cost basis	691.2
Non-PCD loans:
Unpaid principal balance	7,107.9
Credit discount (1)	(76.5)
Non-credit discount	(9.2)
Fair value	7,022.2
Amortized cost basis	$	7,713.4
(1) Represents the best estimate of the contractual cash flows not expected to be collected as of the acquisition date.

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Goodwill and Core Deposit Intangibles (Tables)

3 Months Ended

Mar. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table details changes in the recorded amount of goodwill as of the dates indicated:

	March 31, 2022		December 31, 2021
Net carrying value at beginning of the period	$	621.6	$	621.6
Provisional additions to goodwill from acquisition	516.0		—
Net carrying value at end of period	$	1,137.6	$	621.6

Schedule of Intangibles

Other intangible assets are comprised of core deposit intangibles (“CDI”) and other customer relationship intangibles (“OCRI”) and amounted to the following at March 31, 2022 and December 31, 2021:

	CDI		OCRI		Total
March 31, 2022
Gross other intangible assets, at beginning of the period	$	106.0	$	—	$	106.0
Provisional amounts established through acquisition	49.1		22.8		71.9
Accumulated amortization	(68.0)		(0.3)		(68.3)
Net other intangible assets, end of period	$	87.1	$	22.5	$	109.6
December 31, 2021
Gross other intangible assets, at beginning of the period	$	106.0	$	—	$	106.0
Accumulated amortization	(64.7)		—		(64.7)
Net other intangible assets, end of period	$	41.3	$	—	$	41.3

Schedule of Future Amortization Expense

The following table provides the estimated aggregate future amortization expense of other intangible assets:

Years Ending December 31,	CDI		OCRI		Total
2022 remaining	$	10.9	$	1.4	$	12.3
2023	13.7		1.9		15.6
2024	12.7		1.9		14.6
2025	11.8		1.9		13.7
2026	11.0		1.9		12.9
Thereafter	27.0		13.5		40.5
Total	$	87.1	$	22.5	$	109.6

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Loans Held for Investment (Tables)

3 Months Ended

Mar. 31, 2022

Receivables [Abstract]

Schedule of Loans by Class

The following table presents loans by segment as of the dates indicated:

	March 31, 2022		December 31, 2021
Real estate loans:
Commercial	$	7,805.7	$	3,971.5
Construction loans:
Land acquisition & development	344.8		247.8
Residential	406.0		262.0
Commercial	844.8		498.0
Total construction loans	1,595.6		1,007.8
Residential	1,997.5		1,538.2
Agricultural	833.6		213.9
Total real estate loans	12,232.4		6,731.4
Consumer loans:
Indirect	739.6		737.6
Direct and advance lines	142.5		129.2
Credit card	73.5		64.9
Total consumer loans	955.6		931.7
Commercial	3,017.9		1,475.5
Agricultural	744.3		203.9
Other, including overdrafts	4.6		1.5
Loans held for investment	16,954.8		9,344.0
Deferred loan fees and costs	(9.8)		(12.3)
Loans held for investment, net of deferred fees and costs	16,945.0		9,331.7
Allowance for credit losses	(247.2)		(122.3)
Net loans held for investment	$	16,697.8	$	9,209.4

Schedule of Allowance for Loan Losses by Portfolio Segment

The following tables represent, by loan portfolio segment, the activity in the allowance for credit losses for loans held for investment:

Three Months Ended March 31, 2022	Beginning Balance		Initial ACL Recorded for PCD loans		Provision for (reversal of) Credit Losses (2)		Loans Charged-Off		Recoveries Collected		Ending Balance
Allowance for credit losses (1)
Real estate:
Commercial real estate:
Non-owner occupied	$	17.3	$	24.1	$	6.7	$	(2.9)	$	—	$	45.2
Owner occupied	13.3		9.5		4.6		(2.2)		—		25.2
Multi-family	13.3		29.9		11.4		—		—		54.6
Total commercial real estate	43.9		63.5		22.7		(5.1)		—		125.0
Construction:
Land acquisition & development	0.5		3.4		(0.8)		(2.7)		0.1		0.5
Residential construction	2.4		—		0.9		—		—		3.3
Commercial construction	6.0		0.2		4.0		—		—		10.2
Total construction	8.9		3.6		4.1		(2.7)		0.1		14.0
Residential real estate:
Residential 1-4 family	13.4		0.1		5.2		(0.1)		0.1		18.7
Home equity and HELOC	1.2		—		0.1		—		0.1		1.4
Total residential real estate	14.6		0.1		5.3		(0.1)		0.2		20.1
Agricultural real estate	1.9		2.3		6.4		(5.2)		—		5.4
Total real estate	69.3		69.5		38.5		(13.1)		0.3		164.5
Consumer:
Indirect	14.3		—		(0.3)		(0.9)		0.4		13.5
Direct and advance lines	4.6		—		(0.1)		(0.8)		0.9		4.6
Credit card	2.2		—		0.6		(0.6)		0.1		2.3
Total consumer	21.1		—		0.2		(2.3)		1.4		20.4
Commercial:
Commercial and floor plans	27.1		11.2		18.4		(4.2)		0.4		52.9
Commercial purpose secured by 1-4 family	4.4		0.2		0.4		—		—		5.0
Credit card	0.1		—		0.3		(0.1)		—		0.3
Total commercial	31.6		11.4		19.1		(4.3)		0.4		58.2
Agricultural:
Agricultural	0.3		3.4		(0.5)		(0.2)		1.1		4.1
Total agricultural	0.3		3.4		(0.5)		(0.2)		1.1		4.1
Total allowance for credit losses	$	122.3	$	84.3	$	57.3	$	(19.9)	$	3.2	$	247.2
(1) Amounts presented exclude the allowance for credit losses related to unfunded commitments. These amounts are included in Note “Financial Instruments with Off-Balance Sheet Risk” and the allowance for credit losses related to investment securities which are included in Note “Investment Securities” included in this report.
(2) Amounts include $68.3 million related to the acquired GWB non-PCD loans.

Three Months Ended March 31, 2021	Beginning Balance		Provision for (reversal of) Credit Losses		Loans Charged-Off		Recoveries Collected		Ending Balance
Allowance for credit losses (1)
Real estate:
Commercial real estate:
Non-owner occupied	$	25.5	$	(2.5)	$	—	$	—	$	23.0
Owner occupied	18.3		(0.8)		(0.1)		—		17.4
Multi-family	11.0		0.8		—		—		11.8
Total commercial real estate	54.8		(2.5)		(0.1)		—		52.2
Construction:
Land acquisition & development	1.3		(0.2)		—		0.1		1.2
Residential construction	1.6		(0.2)		—		—		1.4
Commercial construction	7.3		(0.2)		—		0.1		7.2
Total construction	10.2		(0.6)		—		0.2		9.8
Residential real estate:
Residential 1-4 family	11.4		0.1		—		—		11.5
Home equity and HELOC	1.4		—		(0.1)		0.1		1.4
Total residential real estate	12.8		0.1		(0.1)		0.1		12.9
Agricultural real estate	2.7		0.1		—		—		2.8
Total real estate	80.5		(2.9)		(0.2)		0.3		77.7
Consumer:
Indirect	16.7		—		(1.3)		0.6		16.0
Direct and advance lines	4.6		0.7		(0.8)		0.3		4.8
Credit card	2.6		(0.7)		(0.6)		0.2		1.5
Total consumer	23.9		—		(2.7)		1.1		22.3
Commercial:
Commercial and floor plans	34.2		(1.8)		(1.8)		0.4		31.0
Commercial purpose secured by 1-4 family	4.7		(0.2)		—		0.2		4.7
Credit card	0.3		0.2		(0.2)		—		0.3
Total commercial	39.2		(1.8)		(2.0)		0.6		36.0
Agricultural:
Agricultural	0.7		(0.1)		—		—		0.6
Total agricultural	0.7		(0.1)		—		—		0.6
Total allowance for credit losses	$	144.3	$	(4.8)	$	(4.9)	$	2.0	$	136.6
(1) Amounts presented exclude the allowance for credit losses related to unfunded commitments. These amounts are included in Note “Financial Instruments with Off-Balance Sheet Risk” included in this report.

Schedule of Recorded Investment in Impaired Loans

The following tables present the amortized cost basis of collateral-dependent loans by class of loans as of the dates indicated:

	Collateral Type
As of March 31, 2022	Business Assets		Real Property		Other		Total
Real estate	$	0.2	$	67.5	$	—	$	67.7
Commercial	4.8		4.6		—		9.4
Agricultural	—		24.0		—		24.0
Total collateral-dependent	$	5.0	$	96.1	$	—	$	101.1

Schedule of Recorded Investment in Past Due Loans by Class

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans classified in the following table as greater than 90 days past due continue to accrue interest. The following tables present the contractual aging of the Company’s recorded amortized cost basis in loans by portfolio as of the dates indicated.

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of March 31, 2022	Past Due		Past Due		Past Due		Past Due		Loans		Loans (1)		Loans
Real estate
Commercial	$	7.2	$	2.2	$	0.3	$	9.7	$	7,758.6	$	37.4	$	7,805.7
Construction:
Land acquisition & development	2.6		0.1		—		2.7		338.2		3.9		344.8
Residential	2.6		—		—		2.6		403.4		—		406.0
Commercial	0.4		—		—		0.4		844.4		—		844.8
Total construction loans	5.6		0.1		—		5.7		1,586.0		3.9		1,595.6
Residential	4.4		1.6		0.1		6.1		1,984.3		7.1		1,997.5
Agricultural	0.1		3.9		0.4		4.4		790.8		38.4		833.6
Total real estate loans	17.3		7.8		0.8		25.9		12,119.7		86.8		12,232.4
Consumer:
Indirect consumer	5.2		0.9		0.2		6.3		731.5		1.8		739.6
Other consumer	0.5		0.3		—		0.8		141.6		0.1		142.5
Credit card	0.3		0.2		0.4		0.9		72.6		—		73.5
Total consumer loans	6.0		1.4		0.6		8.0		945.7		1.9		955.6
Commercial	2.0		3.8		1.3		7.1		2,995.6		15.2		3,017.9
Agricultural	11.4		4.7		—		16.1		713.2		15.0		744.3
Other, including overdrafts	—		—		—		—		4.6		—		4.6
Loans held for investment	$	36.7	$	17.7	$	2.7	$	57.1	$	16,778.8	$	118.9	$	16,954.8

							Total Loans
	30 - 59		60 - 89		> 90		30 or More
	Days		Days		Days		Days		Current		Non-accrual		Total
As of December 31, 2021	Past Due		Past Due		Past Due		Past Due		Loans		Loans (1)		Loans
Real estate
Commercial	$	1.1	$	1.0	$	0.6	$	2.7	$	3,960.8	$	8.0	$	3,971.5
Construction:
Land acquisition & development	0.2		—		—		0.2		246.9		0.7		247.8
Residential	4.2		—		—		4.2		257.8		—		262.0
Commercial	—		—		—		—		498.0		—		498.0
Total construction loans	4.4		—		—		4.4		1,002.7		0.7		1,007.8
Residential	3.0		0.8		0.1		3.9		1,531.4		2.9		1,538.2
Agricultural	1.9		0.2		—		2.1		206.9		4.9		213.9
Total real estate loans	10.4		2.0		0.7		13.1		6,701.8		16.5		6,731.4
Consumer:
Indirect consumer	5.1		1.4		0.4		6.9		729.0		1.7		737.6
Other consumer	0.5		0.2		0.1		0.8		128.3		0.1		129.2
Credit card	0.6		0.2		0.5		1.3		63.6		—		64.9
Total consumer loans	6.2		1.8		1.0		9.0		920.9		1.8		931.7
Commercial	4.9		0.7		1.1		6.7		1,463.8		5.0		1,475.5
Agricultural	0.7		—		—		0.7		201.6		1.6		203.9
Other, including overdrafts	—		—		—		—		1.5		—		1.5
Loans held for investment	$	22.2	$	4.5	$	2.8	$	29.5	$	9,289.6	$	24.9	$	9,344.0

(1) As of March 31, 2022 and December 31, 2021, none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three months ended March 31, 2022 and 2021, respectively. The Company reversed $1.0 million of accrued interest at March 31, 2022 and none for the same period in 2021.

Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator

The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale for the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	182.1	$	845.0	$	737.0	$	517.2	$	344.9	$	1,023.6	$	67.6	$	3,717.4
Special mention	—		33.4		5.9		21.6		34.0		37.1		—		132.0
Substandard	3.7		21.5		25.5		49.8		36.8		27.8		23.8		188.9
Doubtful	—		0.3		—		—		—		—		—		0.3
Total	$	185.8	$	900.2	$	768.4	$	588.6	$	415.7	$	1,088.5	$	91.4	$	4,038.6
Commercial real estate owner occupied:
Pass	$	189.4	$	843.8	$	585.4	$	336.9	$	220.4	$	585.0	$	54.7	$	2,815.6
Special mention	0.7		3.2		4.2		8.5		7.9		15.7		0.1		40.3
Substandard	6.8		6.1		4.2		6.3		15.4		22.0		0.2		61.0
Doubtful	—		—		—		—		1.8		2.0		—		3.8
Total	$	196.9	$	853.1	$	593.8	$	351.7	$	245.5	$	624.7	$	55.0	$	2,920.7

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial multi-family:
Pass	$	86.2	$	218.9	$	194.7	$	62.2	$	45.5	$	141.1	$	4.7	$	753.3
Special mention	—		—		—		—		—		0.1		—		0.1
Substandard	—		—		37.7		1.2		47.2		0.3		—		86.4
Doubtful	—		—		6.6		—		—		—		—		6.6
Total	$	86.2	$	218.9	$	239.0	$	63.4	$	92.7	$	141.5	$	4.7	$	846.4
Land, acquisition and development:
Pass	$	25.3	$	175.2	$	43.4	$	28.8	$	16.2	$	37.5	$	13.2	$	339.6
Special mention	—		—		0.1		—		0.2		0.4		—		0.7
Substandard	—		0.7		0.2		—		—		0.4		—		1.3
Doubtful	—		3.2		—		—		—		—		—		3.2
Total	$	25.3	$	179.1	$	43.7	$	28.8	$	16.4	$	38.3	$	13.2	$	344.8
Residential construction:
Pass	$	29.7	$	165.4	$	6.7	$	10.3	$	0.8	$	6.4	$	185.9	$	405.2
Substandard	—		—		0.4		—		—		0.4		—		0.8
Total	$	29.7	$	165.4	$	7.1	$	10.3	$	0.8	$	6.8	$	185.9	$	406.0
Commercial construction:
Pass	$	118.2	$	353.6	$	201.4	$	161.6	$	6.6	$	0.6	$	0.4	$	842.4
Substandard	—		—		—		2.4		—		—		—		2.4
Total	$	118.2	$	353.6	$	201.4	$	164.0	$	6.6	$	0.6	$	0.4	$	844.8
Agricultural real estate:
Pass	$	44.2	$	220.5	$	132.1	$	76.7	$	59.7	$	131.8	$	56.2	$	721.2
Special mention	—		7.1		2.8		1.2		12.7		7.6		10.0		41.4
Substandard	0.8		18.1		5.4		5.0		20.0		17.8		—		67.1
Doubtful	—		0.2		1.2		—		—		2.5		—		3.9
Total	$	45.0	$	245.9	$	141.5	$	82.9	$	92.4	$	159.7	$	66.2	$	833.6
Commercial and floor plans:
Pass	$	142.4	$	582.5	$	282.5	$	169.5	$	162.9	$	233.4	$	818.5	$	2,391.7
Special mention	—		4.1		0.6		1.1		1.3		3.0		18.1		28.2
Substandard	9.2		7.6		5.1		2.2		5.4		8.8		16.1		54.4
Doubtful	—		—		—		—		—		3.3		0.2		3.5
Total	$	151.6	$	594.2	$	288.2	$	172.8	$	169.6	$	248.5	$	852.9	$	2,477.8
Commercial purpose secured by 1-4 family:
Pass	$	48.0	$	152.9	$	78.0	$	37.6	$	35.5	$	53.3	$	15.5	$	420.8
Special mention	—		0.2		0.6		0.6		2.0		0.7		—		4.1
Substandard	0.1		1.3		1.2		0.7		0.5		1.5		0.1		5.4
Total	$	48.1	$	154.4	$	79.8	$	38.9	$	38.0	$	55.5	$	15.6	$	430.3
Agricultural:
Pass	$	25.9	$	137.5	$	40.6	$	15.1	$	12.3	$	9.5	$	396.4	$	637.3
Special mention	0.4		3.1		0.7		1.2		2.7		0.3		17.9		26.3
Substandard	1.8		25.8		6.8		0.9		4.4		1.1		34.8		75.6
Doubtful	—		—		—		—		2.5		0.9		—		3.4
Total	$	28.1	$	166.4	$	48.1	$	17.2	$	21.9	$	11.8	$	449.1	$	742.6

	December 31, 2021
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2021		2020		2019		2018		2017		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	507.9	$	452.2	$	237.9	$	150.4	$	76.3	$	409.0	$	15.3	$	1,849.0
Special mention	0.2		3.1		2.1		—		—		3.6		—		9.0
Substandard	3.9		15.3		2.3		0.7		1.0		12.4		—		35.6
Total	$	512.0	$	470.6	$	242.3	$	151.1	$	77.3	$	425.0	$	15.3	$	1,893.6
Commercial real estate owner occupied:
Pass	$	452.7	$	314.9	$	235.0	$	151.0	$	94.5	$	322.5	$	14.2	$	1,584.8
Special mention	1.3		3.2		1.5		7.4		3.5		13.8		—		30.7
Substandard	3.8		4.3		4.7		5.4		2.7		20.3		—		41.2
Total	$	457.8	$	322.4	$	241.2	$	163.8	$	100.7	$	356.6	$	14.2	$	1,656.7
Commercial multi-family:
Pass	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Total	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Land, acquisition and development:
Pass	$	113.0	$	41.5	$	34.2	$	14.8	$	19.8	$	20.8	$	1.2	$	245.3
Special mention	—		0.1		—		—		0.1		0.3		—		0.5
Substandard	0.8		0.2		—		0.6		0.3		0.1		—		2.0
Total	$	113.8	$	41.8	$	34.2	$	15.4	$	20.2	$	21.2	$	1.2	$	247.8
Residential construction:
Pass	$	112.4	$	7.0	$	13.7	$	0.9	$	—	$	—	$	127.2	$	261.2
Substandard	—		0.4		—		—		0.4		—		—		0.8
Total	$	112.4	$	7.4	$	13.7	$	0.9	$	0.4	$	—	$	127.2	$	262.0
Commercial construction:
Pass	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Total	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Agricultural real estate:
Pass	$	58.3	$	36.9	$	35.1	$	22.6	$	11.8	$	28.1	$	4.9	$	197.7
Special mention	0.1		1.3		1.2		0.1		0.1		0.9		0.9		4.6
Substandard	4.0		0.4		1.0		0.6		1.3		4.3		—		11.6
Total	$	62.4	$	38.6	$	37.3	$	23.3	$	13.2	$	33.3	$	5.8	$	213.9
Commercial and floor plans:
Pass	$	394.2	$	165.7	$	94.5	$	73.5	$	47.1	$	91.3	$	224.7	$	1,091.0
Special mention	0.8		11.4		0.8		0.8		3.0		2.3		7.0		26.1
Substandard	1.3		2.8		1.6		2.6		0.6		4.1		2.6		15.6
Total	$	396.3	$	179.9	$	96.9	$	76.9	$	50.7	$	97.7	$	234.3	$	1,132.7
Commercial purpose secured by 1-4 family:
Pass	$	94.9	$	55.0	$	27.8	$	23.1	$	15.3	$	32.2	$	14.4	$	262.7
Special mention	—		0.2		0.2		0.5		0.1		0.6		—		1.6
Substandard	1.3		1.2		0.6		0.6		0.2		1.3		0.1		5.3
Total	$	96.2	$	56.4	$	28.6	$	24.2	$	15.6	$	34.1	$	14.5	$	269.6
Agricultural:
Pass	$	35.1	$	16.2	$	9.0	$	5.4	$	2.1	$	1.6	$	108.9	$	178.3
Special mention	0.2		4.1		0.1		0.4		0.6		0.3		7.0		12.7
Substandard	4.9		0.7		0.6		2.5		—		0.1		2.6		11.4
Total	$	40.2	$	21.0	$	9.7	$	8.3	$	2.7	$	2.0	$	118.5	$	202.4

The following tables present the recorded investment of our other loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Residential 1-4 family:
Performing	$	34.5	$	446.5	$	581.5	$	112.5	$	35.5	$	260.3	$	0.9	$	1,471.7
Nonperforming	—		—		0.1		0.3		0.3		3.8		—		4.5
Total	$	34.5	$	446.5	$	581.6	$	112.8	$	35.8	$	264.1	$	0.9	$	1,476.2
Consumer home equity and HELOC:
Performing	$	4.6	$	16.5	$	10.6	$	5.8	$	6.9	$	19.5	$	454.8	$	518.7
Nonperforming	—		0.5		0.2		0.2		0.1		1.1		0.5		2.6
Total	$	4.6	$	17.0	$	10.8	$	6.0	$	7.0	$	20.6	$	455.3	$	521.3
Consumer indirect:
Performing	$	78.4	$	251.6	$	187.0	$	94.4	$	54.9	$	71.3	$	—	$	737.6
Nonperforming	—		0.5		0.5		0.3		0.2		0.5		—		2.0
Total	$	78.4	$	252.1	$	187.5	$	94.7	$	55.1	$	71.8	$	—	$	739.6
Consumer direct and advance line:
Performing	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5
Total	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5

The following table presents the recorded investment in credit card loans based on payment activity for the periods indicated:

As of March 31, 2022	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	73.1	$	109.5	$	1.8	$	184.4
Nonperforming	0.4		0.3		—		0.7
Total credit card	$	73.5	$	109.8	$	1.8	$	185.1

As of December 31, 2021	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	64.4	$	73.1	$	1.5	$	139.0
Nonperforming	0.5		0.1		—		0.6
Total credit card	$	64.9	$	73.2	$	1.5	$	139.6

In the normal course of business, th

Financing Receivable, Troubled Debt Restructuring

	Number of Notes	Type of Concession								Principal Balance at Restructure
Three Months Ended March 31, 2022		Interest only period		Extension of term or amortization schedule		Interest rate adjustment		Other (1)
Commercial real estate	2	$	3.2	$	4.2	$	—	$	—	$	7.4
Residential real estate	1	—		0.5		—		—		0.5
Agricultural real estate	1	—		8.9		—		—		8.9
Commercial	1	—		—		—		0.4		0.4
Total loans restructured during period	5	$	3.2	$	13.6	$	—	$	0.4	$	17.2
(1) Other includes concessions that reduce or defer payments for a specified period of time and/or concessions that do not fit into other designated categories.

Schedule of Acquired Loans with Credit Impairment

The following table reconciles the par value, or initial amortized cost, of PCD loans acquired in the GWB acquisition as of the date of the acquisition with the purchase price (or initial fair value of the loans):

Purchase price (initial fair value)	$	606.9
Allowance for credit losses (1)	323.0
Discount attributable to other factors (2)	49.3
Par value (unpaid principal balance)	$	979.2

(1) For acquired PCD loans, an allowance of $323.0 million was required with a corresponding increase to the amortized cost basis as of the acquisition date. For PCD loans where all or a portion of the loan balance had been previously written-off by GWB, or would be subject to write-off under the Company’s charge-off policy, a CECL allowance of $238.7 million, included as part of the grossed-up loan balance at acquisition was immediately written-off. The net impact to the allowance for PCD assets on the acquisition date was $84.3 million.

(2) Non-credit discount includes the difference between the amortized cost basis and the unpaid principal balance of $31.2 million established on GWB PCD loans acquired and interest applied to principal of $18.1 million.

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Other Real Estate Owned (Tables)

3 Months Ended

Mar. 31, 2022

Repossessed Assets [Abstract]

Other Real Estate Owned Roll Forward

Information with respect to the Company’s other real estate owned is reflected in the following table:

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	2.0	$	2.5
OREO acquired through acquisition	15.8		—
Additions	—		0.3
Dispositions	(0.3)		(0.6)
Ending balance	$	17.5	$	2.2

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Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share for the periods presented:

	Three Months Ended March 31,
	2022		2021
Net (loss) income	$	(33.4)	$	51.4
Weighted average common shares outstanding for basic earnings per share computation	92,855,173		61,591,877
Dilutive effects of stock-based compensation	—		122,186
Weighted average common shares outstanding for diluted earnings per common share computation	92,855,173		61,714,063
Basic (loss) earnings per common share	$	(0.36)	$	0.83
Diluted (loss) earnings per common share	$	(0.36)	$	0.83
Anti-dilutive unvested time restricted stock	55,504		92,602

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Regulatory Capital (Tables)

3 Months Ended

Mar. 31, 2022

Banking and Thrift, Other Disclosures [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

Actual capital amounts and ratios for the Company and its subsidiary Bank, as of March 31, 2022 and December 31, 2021 are presented in the following tables: 

	Actual				Minimum Required for Capital Adequacy Purposes				For Capital Adequacy Purposes Plus Capital Conservation Buffer				Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
March 31, 2022	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital:
Consolidated	$	2,930.9	14.27	%	$	1,643.5	8.00	%	$	2,157.1	10.50	%	$	2,054.4	10.00	%
FIB	2,787.3		13.61		1,638.3		8.00		2,150.2		10.50		2,047.9		10.00
Tier 1 risk-based capital:
Consolidated	2,446.7		11.91		1,232.6		6.00		1,746.2		8.50		1,643.5		8.00
FIB	2,560.7		12.50		1,228.7		6.00		1,740.7		8.50		1,638.3		8.00
Common equity tier 1 risk-based capital:
Consolidated	2,446.7		11.91		924.5		4.50		1,438.1		7.00		1,335.3		6.50
FIB	2,560.7		12.50		921.5		4.50		1,433.5		7.00		1,331.1		6.50
Leverage capital ratio:
Consolidated	2,446.7		8.96		1,091.7		4.00		1,091.7		4.00		1,364.6		5.00
FIB	2,560.7		9.36		1,093.8		4.00		1,093.8		4.00		1,367.2		5.00

	Actual				Minimum Required for Capital Adequacy Purposes				For Capital Adequacy Purposes Plus Capital Conservation Buffer				Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1)
December 31, 2021	Amount		Ratio		Amount		Ratio		Amount		Ratio		Amount		Ratio
Total risk-based capital:
Consolidated	$	1,659.3	14.11	%	$	940.9	8.00	%	$	1,235.0	10.50	%	$	1,176.2	10.00	%
FIB	1,472.5		12.56		938.0		8.00		1,231.1		10.50		1,172.5		10.00
Tier 1 risk-based capital:
Consolidated	1,469.0		12.49		705.7		6.00		999.7		8.50		940.9		8.00
FIB	1,382.2		11.79		703.5		6.00		996.6		8.50		938.0		8.00
Common equity tier 1 risk-based capital:
Consolidated	1,384.8		11.77		529.3		4.50		823.3		7.00		764.5		6.50
FIB	1,382.2		11.79		527.6		4.50		820.8		7.00		762.1		6.50
Leverage capital ratio:
Consolidated	1,469.0		7.68		765.5		4.00		765.5		4.00		956.9		5.00
FIB	1,382.2		7.24		764.1		4.00		764.1		4.00		955.1		5.00

(1) The ratios to meet the requirements to be deemed “well-capitalized” are only applicable to FIB. However, the Company manages its capital position as if the requirements apply to the consolidated company and has presented the ratios as if they also applied on a consolidated basis.

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Other Comprehensive Income/Loss (Tables)

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Schedule of Other Comprehensive Income and Related Tax Effects

The gross amounts of each component of other comprehensive loss and the related tax effects are as follows:

	Pre-tax				Tax Expense (Benefit)				Net of Tax
Three Months Ended March 31,	2022		2021		2022		2021		2022		2021
Investment securities available-for sale:
Change in net unrealized loss during period	$	(252.6)	$	(66.8)	$	(62.7)	$	(17.0)	$	(189.9)	$	(49.8)
Reclassification adjustment for net loss included in net income	0.1		—		—		—		0.1		—
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	0.2		—		0.1		—		0.1		—
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity	(23.0)		—		(5.7)		—		(17.3)		—
Change in net unrealized loss (gain) on derivatives	21.3		(0.1)		5.3		—		16.0		(0.1)
Total other comprehensive loss	$	(254.0)	$	(66.9)	$	(63.0)	$	(17.0)	$	(191.0)	$	(49.9)

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive loss, net of related tax effects, are as follows:

	March 31, 2022		December 31, 2021
Net unrealized loss on investment securities available-for-sale	$	(218.1)	$	(29.0)
Net unrealized (loss) gain on investment securities transferred to held-to-maturity	(2.9)		15.0
Net unrealized gain on derivatives	19.0		3.0
Net accumulated other comprehensive loss	$	(202.0)	$	(11.0)

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis

Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:

			Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:
U.S. Treasury notes	$	644.9	$	644.9	$	—	$	—
State, county, and municipal securities	292.7			—	292.7			—
Obligations of U.S. government agencies	137.9			—	137.9			—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	3,645.7			—	3,645.7			—
Private mortgage-backed securities	274.8			—	274.8			—
Collateralized loan obligations	1,070.9			—	1,070.9			—
Corporate securities	216.9			—	216.9			—
Loans held for sale	178.1			—	178.1			—
Derivative assets:
Interest rate swap contracts	25.6			—	25.6			—
Forward loan sale contracts	1.3			—	1.3			—
Derivative liabilities:
Interest rate swap contracts	62.3			—	62.3			—
Risk participation agreements	0.4			—	0.4			—
Deferred compensation plan assets	19.7			—	19.7			—
Deferred compensation plan liabilities	19.7			—	19.7			—

			Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:
U.S. Treasury notes	$	684.7	$	684.7	$	—	$	—
State, county and municipal securities	$	427.5	$	—	427.5		$	—
Obligations of U.S. government agencies	346.9			—	346.9			—
U.S. agencies mortgage-backed securities & collateralized mortgage obligations	2,018.1			—	2,018.1			—
Private mortgage-backed securities	173.4			—	173.4			—
Collateralized loan obligations	899.4			—	899.4			—
Corporate securities	270.5			—	270.5			—
Loans held for sale	30.1			—	30.1			—
Derivative assets:
Interest rate swap contracts	26.3			—	26.3			—
Interest rate lock commitments	1.8			—	1.8			—
Derivative liabilities
Interest rate swap contracts	18.2			—	18.2			—
Deferred compensation plan assets	21.4			—	21.4			—
Deferred compensation plan liabilities	21.4			—	21.4			—

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis

The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis:

				Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Collateral dependent loans	$	101.1	$	—	$	—	$	101.1
Other real estate owned	17.5			—		—	17.5
Long-lived assets to be disposed of by sale	1.5			—		—	1.5
				Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Balance		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Collateral dependent loans	$	11.7	$	—	$	—	$	11.7
Other real estate owned	2.0			—		—	2.0
Long-lived assets to be disposed of by sale	1.3			—		—	1.3

Fair Value Inputs, Assets, Quantitative Information

The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:

	Fair Value As of
	March 31, 2022		December 31, 2021		Valuation Technique	Unobservable Inputs	Range (Weighted Average)
Collateral dependent loans	$	101.1	$	11.7	Appraisal	Appraisal adjustment	1%	-	18%	(7%)
Other real estate owned	17.5		2.0		Appraisal	Appraisal adjustment	0%	-	0%	0%
Long-lived assets to be disposed of by sale	1.5		1.3		Appraisal	Appraisal adjustment	0%	-	0%	0%

Fair Value, by Balance Sheet Grouping

The estimated fair values of financial instruments that are reported in the Company’s consolidated balance sheets, and are segregated by the level of the valuation inputs within the fair value hierarchy that are utilized to measure fair value, are as follows:

					Fair Value Measurements at Reporting Date Using
As of March 31, 2022	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	3,811.3	$	3,811.3	$	3,811.3	$	—	$	—
Securities purchased under agreement to resell	102.0		102.0		—		102.0		—
Investment debt securities available-for-sale	6,283.8		6,283.8		644.9		5,638.9		—
Investment debt securities held-to-maturity	3,218.7		3,029.1		296.2		2,732.9		—
Accrued interest receivable	81.1		81.1		—		81.1		—
Mortgage servicing rights, net	32.7		35.8		—		35.8		—
Loans held for sale	178.1		178.1		—		178.1		—
Net loans held for investment	16,697.8		16,676.6		—		16,575.5		101.1
Derivative assets	26.9		26.9		—		26.9		—
Deferred compensation plan assets	19.7		19.7		—		19.7		—
Total financial assets	$	30,452.1	$	30,244.4	$	4,752.4	$	25,390.9	$	101.1
Financial liabilities:
Total deposits, excluding time deposits	$	26,489.9	$	26,489.9	$	26,489.9	$	—	$	—
Time deposits	1,598.4		1,579.8		—		1,579.8		—
Securities sold under repurchase agreements	1,071.0		1,071.0		—		1,071.0		—
Accrued interest payable	6.0		6.0		—		6.0		—
Long-term debt	120.4		122.8		—		122.8		—
Subordinated debentures held by subsidiary trusts	163.1		162.3		—		162.3		—
Derivative liabilities	62.7		62.7		—		62.7		—
Deferred compensation plan liabilities	19.7		19.7		—		19.7		—
Total financial liabilities	$	29,531.2	$	29,514.2	$	26,489.9	$	3,024.3	$	—

					Fair Value Measurements at Reporting Date Using
As of December 31, 2021	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	$	2,344.8	$	2,344.8	$	2,344.8	$	—	$	—
Investment debt securities available-for-sale	4,820.5		4,820.5		684.7		4,135.8		—
Investment debt securities held-to-maturity	1,687.6		1,667.5		—		1,667.5		—
Accrued interest receivable	47.4		47.4		—		47.4		—
Mortgage servicing rights, net	28.2		28.2		—		28.2		—
Loans held for sale	30.1		30.1		—		30.1		—
Net loans held for investment	9,209.4		9,254.3		—		9,242.6		11.7
Derivative assets	28.1		28.1		—		28.1		—
Deferred compensation plan assets	21.4		21.4		—		21.4		—
Total financial assets	$	18,217.5	$	18,242.3	$	3,029.5	$	15,201.1	$	11.7
Financial liabilities:
Total deposits, excluding time deposits	$	15,303.1	$	15,303.1	$	15,303.1	$	—	$	—
Time deposits	966.5		963.1		—		963.1		—
Securities sold under repurchase agreements	1,051.1		1,051.1		—		1,051.1		—
Accrued interest payable	3.7		3.7		—		3.7		—
Long-term debt	112.4		120.7		—		120.7		—
Subordinated debentures held by subsidiary trusts	87.0		85.5		—		85.5		—
Derivative liabilities	18.2		18.2		—		18.2		—
Deferred compensation plan liabilities	21.4		21.4		—		21.4		—
Total financial liabilities	$	17,563.4	$	17,566.8	$	15,303.1	$	2,263.7	$	—

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Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Proceeds from Interest Received	$ 0.6	$ (1.1)
Accounts Receivable, Allowance for Credit Loss	247.2	136.6	$ 122.3	$ 144.3
Off-Balance Sheet, Credit Loss, Liability	6.2	$ 3.4	3.8	$ 3.7
Deferred tax liability, net	0.0		(9.3)
Retained Earnings (Accumulated Deficit)	974.5		$ 1,052.6
2022 remaining	12.3
OCRI
2022 remaining	$ 1.4

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Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Available-for-Sale:
Amortized Cost	$ 6,575,100,000	$ 4,859,300,000
Gross Unrealized Gains	1,800,000	20,600,000
Gross Unrealized Losses	(293,100,000)	(59,400,000)
Estimated Fair Value	6,283,800,000	4,820,500,000
Held-to-Maturity:
Amortized Cost	3,220,300,000	1,687,600,000
Allowance for Credit Losses	(1,600,000)	0	$ 0	$ 0
Net Carrying Amount	3,218,700,000	1,687,600,000
Gross Unrealized Gains	19,200,000	15,600,000
Gross Unrealized Losses	(208,800,000)	(35,700,000)
Estimated Fair Value	3,029,100,000	1,667,500,000
U.S. Treasury notes
Available-for-Sale:
Amortized Cost	698,200,000	697,600,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(53,300,000)	(12,900,000)
Estimated Fair Value	644,900,000	684,700,000
Held-to-Maturity:
Amortized Cost	296,200,000
Allowance for Credit Losses	0
Net Carrying Amount	296,200,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	296,200,000
State, county, and municipal securities
Available-for-Sale:
Amortized Cost	320,300,000	434,700,000
Gross Unrealized Gains	200,000	2,100,000
Gross Unrealized Losses	(27,800,000)	(9,300,000)
Estimated Fair Value	292,700,000	427,500,000
Held-to-Maturity:
Amortized Cost	197,300,000	67,600,000
Allowance for Credit Losses	(100,000)	0
Net Carrying Amount	197,200,000	67,600,000
Gross Unrealized Gains	800,000	2,000,000.0
Gross Unrealized Losses	(21,400,000)	(400,000)
Estimated Fair Value	176,600,000	69,200,000
Obligations of U.S. government agencies
Available-for-Sale:
Amortized Cost	144,600,000	356,000,000.0
Gross Unrealized Gains	0	100,000
Gross Unrealized Losses	(6,700,000)	(9,200,000)
Estimated Fair Value	137,900,000	346,900,000
Held-to-Maturity:
Amortized Cost	340,800,000
Allowance for Credit Losses	0
Net Carrying Amount	340,800,000
Gross Unrealized Gains	0
Gross Unrealized Losses	(32,300,000)
Estimated Fair Value	308,500,000
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Amortized Cost	3,816,400,000	2,027,300,000
Gross Unrealized Gains	1,100,000	14,100,000
Gross Unrealized Losses	(171,800,000)	(23,300,000)
Estimated Fair Value	3,645,700,000	2,018,100,000
Held-to-Maturity:
Amortized Cost	2,302,000,000	1,609,000,000
Allowance for Credit Losses	0	0
Net Carrying Amount	2,302,000,000	1,609,000,000
Gross Unrealized Gains	18,200,000	13,200,000
Gross Unrealized Losses	(152,400,000)	(35,300,000)
Estimated Fair Value	2,167,800,000	1,586,900,000
Debt Securities, Held-To-Maturity, Transfer, Unamortized Gain	17,900,000	20,100,000
Debt Securities, Held-To-Maturity, Transfer, Unamortized Loss	(21,800,000)
Private mortgage-backed securities
Available-for-Sale:
Amortized Cost	288,400,000	174,400,000
Gross Unrealized Gains	0	100,000
Gross Unrealized Losses	(13,600,000)	(1,100,000)
Estimated Fair Value	274,800,000	173,400,000
Collateralized Loan Obligations
Available-for-Sale:
Amortized Cost	1,075,400,000	898,200,000
Gross Unrealized Gains	0	1,200,000
Gross Unrealized Losses	(4,500,000)	0
Estimated Fair Value	1,070,900,000	899,400,000
Corporate Debt Securities
Available-for-Sale:
Amortized Cost	231,800,000	271,100,000
Gross Unrealized Gains	500,000	3,000,000.0
Gross Unrealized Losses	(15,400,000)	(3,600,000)
Estimated Fair Value	216,900,000	270,500,000
Held-to-Maturity:
Amortized Cost	84,000,000.0	11,000,000.0
Allowance for Credit Losses	(1,500,000)	0
Net Carrying Amount	82,500,000	11,000,000.0
Gross Unrealized Gains	200,000	400,000
Gross Unrealized Losses	(2,700,000)	0
Estimated Fair Value	$ 80,000,000.0	$ 11,400,000

XML

Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Available-for-Sale:
Fair Value, Less than 12 Months	$ 5,650.9	$ 2,760.3
Gross Unrealized Losses, Less than 12 Months	(276.4)	(58.3)
Fair Value, 12 Months or Longer	149.2	68.7
Gross Unrealized Losses, 12 Months or Longer	(16.7)	(1.1)
Fair Value, Total	5,800.1	2,829.0
Gross Unrealized Losses, Total	(293.1)	(59.4)
US Treasury Notes Securities
Available-for-Sale:
Fair Value, Less than 12 Months	644.9
Gross Unrealized Losses, Less than 12 Months	(53.3)
Fair Value, 12 Months or Longer	0.0
Gross Unrealized Losses, 12 Months or Longer	0.0
Fair Value, Total	644.9
Gross Unrealized Losses, Total	(53.3)
U.S. Treasury notes
Available-for-Sale:
Fair Value, Less than 12 Months		684.7
Gross Unrealized Losses, Less than 12 Months		(12.9)
Fair Value, 12 Months or Longer		0.0
Gross Unrealized Losses, 12 Months or Longer		0.0
Fair Value, Total		684.7
Gross Unrealized Losses, Total		(12.9)
State, county, and municipal securities
Available-for-Sale:
Fair Value, Less than 12 Months	223.6	278.7
Gross Unrealized Losses, Less than 12 Months	(22.7)	(9.1)
Fair Value, 12 Months or Longer	29.6	5.0
Gross Unrealized Losses, 12 Months or Longer	(5.1)	(0.2)
Fair Value, Total	253.2	283.7
Gross Unrealized Losses, Total	(27.8)	(9.3)
Obligations of U.S. government agencies
Available-for-Sale:
Fair Value, Less than 12 Months	101.5	297.0
Gross Unrealized Losses, Less than 12 Months	(5.4)	(8.9)
Fair Value, 12 Months or Longer	15.4	16.4
Gross Unrealized Losses, 12 Months or Longer	(1.3)	(0.3)
Fair Value, Total	116.9	313.4
Gross Unrealized Losses, Total	(6.7)	(9.2)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Fair Value, Less than 12 Months	3,238.5	1,262.8
Gross Unrealized Losses, Less than 12 Months	(163.4)	(23.0)
Fair Value, 12 Months or Longer	84.9	26.4
Gross Unrealized Losses, 12 Months or Longer	(8.4)	(0.3)
Fair Value, Total	3,323.4	1,289.2
Gross Unrealized Losses, Total	(171.8)	(23.3)
Private mortgage-backed securities
Available-for-Sale:
Fair Value, Less than 12 Months	274.8	127.2
Gross Unrealized Losses, Less than 12 Months	(13.6)	(1.1)
Fair Value, 12 Months or Longer	0.0	0.0
Gross Unrealized Losses, 12 Months or Longer	0.0	0.0
Fair Value, Total	274.8	127.2
Gross Unrealized Losses, Total	(13.6)	(1.1)
Collateralized Loan Obligations
Available-for-Sale:
Fair Value, Less than 12 Months	1,020.9
Gross Unrealized Losses, Less than 12 Months	(4.5)
Fair Value, 12 Months or Longer	0.0
Gross Unrealized Losses, 12 Months or Longer	0.0
Fair Value, Total	1,020.9
Gross Unrealized Losses, Total	(4.5)
Corporate Debt Securities
Available-for-Sale:
Fair Value, Less than 12 Months	146.7	109.9
Gross Unrealized Losses, Less than 12 Months	(13.5)	(3.3)
Fair Value, 12 Months or Longer	19.3	20.9
Gross Unrealized Losses, 12 Months or Longer	(1.9)	(0.3)
Fair Value, Total	166.0	130.8
Gross Unrealized Losses, Total	$ (15.4)	$ (3.6)

XML

Investment Securities - Narrative (Details)		3 Months Ended
	Feb. 01, 2022 USD ($)	Mar. 31, 2022 USD ($) Investments	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) Investments	Dec. 31, 2020 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Transfer, Amount	$ 10,700,000
Debt Securities, Held-To-Maturity, After Allowance For Credit Loss, Transfer, Amount	10,900,000
Debt Securities, Available-For-Sale, Amortized Cost, after Allowance for Credit Loss, Transfer, Amount	485,900,000
Debt Securities, Available-For-Sale, after Allowance for Credit Loss, Transfer, Amount	463,600,000
Debt Securities, Held-to-maturity, Transfer to Trading, Unrealized Gain (Loss)	0
Allowance for Credit Losses		$ 0		$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss		1,600,000	$ 0	0	$ 0
Interest Receivable		81,100,000		47,400,000
Debt Securities, Available-for-sale, Realized Gain		0	0
Debt Securities, Available-for-sale, Realized Loss		0	$ 0
Debt Securities, Available-for-sale, Amortized Cost		6,575,100,000		4,859,300,000
Securities Sold under Agreements to Repurchase, Fair Value of Collateral		2,587,000,000		2,617,800,000
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		$ 2,421,800,000		$ 2,610,800,000
Investment securities in an unrealized loss position (securities) | Investments		965		285
Great Western Bank
Schedule of Held-to-maturity Securities [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Debt Securities, Available-For-Sale	2,356,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Debt Securities, Held-To-Maturity	$ 342,100,000
Residential Mortgage Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		$ 253,000,000
Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Interest Receivable		23,600,000		$ 16,600,000
Callable Within One Year
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost of investment securities callable after one year but within five years		206,300,000
Fair value of investment securities callable after one year but within five years		202,300,000
Callable structured notes amortized costs		$ 0

XML

Investment Securities - Held-To-Maturity Allowance For Credit Loss (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 0	$ 0
Provision for credit loss expense	1,600,000	0
Ending balance of allowance for credit losses	$ 1,600,000	$ 0

XML

Investment Securities - Credit Quality Indicators (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	$ 3,220.3	$ 1,687.6
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	3,011.6	1,626.2
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	102.7	31.6
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	17.7	18.7
BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	75.0	7.0
Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	13.3	4.1
U.S. Treasury notes
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	296.2
U.S. Treasury notes | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	296.2
U.S. Treasury notes | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
U.S. Treasury notes | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
U.S. Treasury notes | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
U.S. Treasury notes | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
State, county, and municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	197.3	67.6
State, county, and municipal securities | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	72.6	17.2
State, county, and municipal securities | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	102.7	31.6
State, county, and municipal securities | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	13.7	14.7
State, county, and municipal securities | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
State, county, and municipal securities | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	8.3	4.1
Obligations of U.S. government agencies
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	340.8
Obligations of U.S. government agencies | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	340.8
Obligations of U.S. government agencies | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
Obligations of U.S. government agencies | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
Obligations of U.S. government agencies | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
Obligations of U.S. government agencies | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	84.0	11.0
Corporate securities | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
Corporate securities | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
Corporate securities | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	4.0	4.0
Corporate securities | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	75.0	7.0
Corporate securities | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	5.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	2,302.0	1,609.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	1,958.2	1,439.1
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	1,958.2	1,439.1
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | FNMA/FHLMC | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	343.8	169.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	343.8	169.9
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0.0	0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | GNMA | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	$ 0.0	$ 0.0

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Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Available-for-Sale, Amortized Cost
Available-for-Sale Amortized Cost, Within One Year	$ 926.6
Available-for-Sale Amortized Cost, After One Year but Within Five Years	2,724.4
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years	1,139.8
Available-for-Sale Amortized Cost, After Ten Years	1,784.3
Amortized Cost	6,575.1	$ 4,859.3
Available-for-Sale, Estimated Fair Value
Available-for-Sale Estimated Fair Value, Within One Year	886.6
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years	2,592.0
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years	1,074.3
Available-for-Sale Estimated Fair Value, After Ten Years	1,730.9
Available-for-Sale, Estimated Fair Value	6,283.8	4,820.5
Held-to-Maturity, Amortized Cost
Held-to-Maturity Amortized Cost, Within One Year	377.1
Held-to-Maturity Amortized Cost, After One Year but Within Five Years	1,334.1
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years	1,026.2
Held-to-Maturity Amortized Cost, After Ten Years	482.9
Amortized Cost	3,220.3	1,687.6
Held-to-Maturity, Estimated Fair Value
Held-to-Maturity Estimated Fair Value, Within One Year	355.3
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years	1,274.0
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years	956.0
Held-to-Maturity Estimated Fair Value, After Ten Years	443.8
Held-to-Maturity, Estimated Fair Value	3,029.1	1,667.5
Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	2,587.0	2,617.8
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	$ 2,421.8	$ 2,610.8

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Acquisitions - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended
	Feb. 01, 2022 USD ($) office $ / shares shares	Apr. 08, 2019	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 1,137.6		$ 621.6	$ 621.6
Estimated useful lives of related deposits			12 years
Acquisition related expenses			$ 65.2	$ 0.0
Core Deposits
Business Acquisition [Line Items]
Estimated useful lives of related deposits		10 years	10 years
Great Western Bank
Business Acquisition [Line Items]
Number of banking offices acquired | office	174
Total consideration exchanged	$ 1,723.3
Goodwill	516.0
Core deposit intangibles	49.1
Customer relationship intangible	22.8
Acquisition related costs	25.8
Great Western Bank | First Interstate Foundation
Business Acquisition [Line Items]
Acquisition related costs	21.5
Great Western Bank | Scott Family
Business Acquisition [Line Items]
Acquisition related costs	$ 8.2
Great Western Bank | Class A Common Stock
Business Acquisition [Line Items]
Number of shares issued in connection with Cascade merger (in shares) | shares	46,879,601
Price per share of First Interstate Class A common stock (in dollars per share) | $ / shares	$ 36.76
Business acquisition conversion share rate (in shares) | shares	0.8425
Great Western Bank | Customer Relationships
Business Acquisition [Line Items]
Estimated useful lives of related deposits	12 years

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Acquisitions - Schedule of Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Feb. 01, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liabilities assumed:
Goodwill		$ 1,137,600	$ 621,600	$ 621,600
Great Western Bank
Assets acquired:
Cash and cash equivalents	$ 2,006,900
Investment securities	2,699,000
Securities purchased under agreement to resell	101,100
Loans held for sale	181,900
Loans held for investment	7,713,400
Allowance for credit losses	(84,300)
Premises and equipment, including right of use lease assets	144,100
Other real estate owned (“OREO”)	15,800
Company owned life insurance	186,600
Core deposit intangibles	49,100
Customer relationship intangible	22,800
Mortgage servicing rights	1,300
Deferred tax assets, net	76,100
Other assets	198,000
Total assets acquired	13,311,800
Liabilities assumed:
Deposits	11,688,000
Securities sold under repurchase agreements	74,000
Accrued expenses and other liabilities	107,100
FHLB advances	122,900
Subordinated debt	36,400
Subordinated debentures held by subsidiary trusts	76,100
Total liabilities assumed	12,104,500
Net assets acquired	1,207,300
Class A common stock	1,723,300
Total consideration paid (1)	1,723,300
Goodwill	516,000
Cash paid in lieu of fractional shares	$ 13

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Acquisitions - Schedule of Acquired loans with Credit Impairment (Details) - USD ($) $ in Millions	Mar. 31, 2022	Feb. 01, 2022
Business Acquisition [Line Items]
Purchase price (initial fair value)		$ 606.9
Allowance for credit losses	$ 323.0	323.0
Great Western Bank
Business Acquisition [Line Items]
Unpaid principal balance		979.2
Credit discount		90.9
Discount attributable to other factors		24.6
Purchase price (initial fair value)		606.9
Allowance for credit losses		84.3
Amortized cost basis		$ 691.2

XML

Acquisitions - Schedule of Acquired Loans not Deemed to Have Credit Impairment (Details) - USD ($) $ in Millions	Feb. 01, 2022	Mar. 31, 2022
Business Acquisition [Line Items]
Purchase price (initial fair value)	$ 606.9
Allowance for credit losses	323.0	$ 323.0
Great Western Bank
Business Acquisition [Line Items]
Unpaid principal balance	979.2
Principal amounts previously written off by GWB	(238.7)
Interest applied to principal by GWB	(18.1)
Adjusted unpaid principal balance	722.4
Credit discount	(90.9)
Discount attributable to other factors	(24.6)
Purchase price (initial fair value)	606.9
Allowance for credit losses	84.3
Amortized cost basis	691.2
Unpaid principal balance	7,107.9
Credit discount (1)	(76.5)
Non-credit discount	(9.2)
Fair value	7,022.2
Amortized cost basis	$ 7,713.4

XML

Acquisitions - Summary of Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.70	$ (0.72)
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.70	$ (0.72)
Great Western Bank
Business Acquisition [Line Items]
Total revenues	$ 268.9	$ 321.6
Net income (loss)	$ 76.4	$ (78.2)

XML

Goodwill and Core Deposit Intangibles - Narrative (Details) - USD ($)		3 Months Ended
	Apr. 08, 2019	Mar. 31, 2022	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill		$ 0
Goodwill [Line Items]
Amortization of intangible assets		$ 3,600,000	$ 2,500,000
Weighted average useful lives of related deposits		12 years
Core Deposits
Goodwill [Line Items]
Weighted average useful lives of related deposits	10 years	10 years

XML

Goodwill and Core Deposit Intangibles - Goodwill Carrying Value (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Net carrying value at beginning of the period	$ 621.6	$ 621.6
Provisional additions to goodwill from acquisition	516.0	0.0
Net carrying value at end of period	$ 1,137.6	$ 621.6

XML

Goodwill and Core Deposit Intangibles - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
2023	$ 15.6
Finite-lived Intangible Assets [Roll Forward]
Gross other intangible assets, at beginning of the period		$ 106.0	$ 106.0
Provisional amounts established through acquisition	71.9
Accumulated amortization	(68.3)	(64.7)
Net other intangible assets, end of period	109.6	41.3
Core Deposits
Finite-Lived Intangible Assets [Line Items]
2023	13.7
Finite-lived Intangible Assets [Roll Forward]
Gross other intangible assets, at beginning of the period		106.0	106.0
Provisional amounts established through acquisition	49.1
Accumulated amortization	(68.0)	(64.7)
Net other intangible assets, end of period	87.1	41.3
OCRI
Finite-Lived Intangible Assets [Line Items]
2023	1.9
Finite-lived Intangible Assets [Roll Forward]
Gross other intangible assets, at beginning of the period		0.0	$ 0.0
Provisional amounts established through acquisition	22.8
Accumulated amortization	(0.3)	0.0
Net other intangible assets, end of period	$ 22.5	$ 0.0

XML

Goodwill and Core Deposit Intangibles - Schedule of Future Amortization Expense (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
2022 remaining	$ 12.3
2023	15.6
2024	14.6
2025	13.7
2026	12.9
Finite-Lived Intangible Asset, Expected Amortization, After Year Four	40.5
Total	109.6	$ 41.3
Core Deposits
Finite-Lived Intangible Assets [Line Items]
2022 remaining	10.9
2023	13.7
2024	12.7
2025	11.8
2026	11.0
Finite-Lived Intangible Asset, Expected Amortization, After Year Four	27.0
Total	87.1	41.3
OCRI
Finite-Lived Intangible Assets [Line Items]
2022 remaining	1.4
2023	1.9
2024	1.9
2025	1.9
2026	1.9
Finite-Lived Intangible Asset, Expected Amortization, After Year Four	13.5
Total	$ 22.5	$ 0.0

XML

Loans Held for Investment - Schedule of Loans by Segment (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Deferred loan fees and costs	$ (9.8)	$ (12.3)
Loans held for investment, net of deferred fees and costs	16,945.0	9,331.7
Allowance for credit losses	(247.2)	(122.3)	$ (136.6)	$ (144.3)
Net loans held for investment	16,697.8	9,209.4
Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	7,805.7	3,971.5
Allowance for credit losses	(125.0)	(43.9)	(52.2)	(54.8)
Financing Receivable, Loan in Process	9.7	2.7
Commercial real estate | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	7.2	1.1
Commercial real estate | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.2	1.0
Commercial real estate | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.3	0.6
Commercial real estate | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	7,758.6	3,960.8
Land acquisition & development
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	344.8	247.8
Allowance for credit losses	(0.5)	(0.5)	(1.2)	(1.3)
Financing Receivable, Loan in Process	2.7	0.2
Land acquisition & development | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.6	0.2
Land acquisition & development | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.1	0.0
Land acquisition & development | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Land acquisition & development | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	338.2	246.9
Residential
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	406.0	262.0
Allowance for credit losses	(3.3)	(2.4)	(1.4)	(1.6)
Financing Receivable, Loan in Process	2.6	4.2
Residential | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.6	4.2
Residential | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Residential | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Residential | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	403.4	257.8
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	844.8	498.0
Allowance for credit losses	(10.2)	(6.0)	(7.2)	(7.3)
Financing Receivable, Loan in Process	0.4	0.0
Commercial | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.4	0.0
Commercial | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Commercial | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Commercial | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	844.4	498.0
Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	1,595.6	1,007.8
Financing Receivable, Loan in Process	5.7	4.4
Total construction loans | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	5.6	4.4
Total construction loans | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.1	0.0
Total construction loans | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Total construction loans | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1,586.0	1,002.7
Residential
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	1,997.5	1,538.2
Allowance for credit losses	(20.1)	(14.6)	(12.9)	(12.8)
Financing Receivable, Loan in Process	6.1	3.9
Residential | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	4.4	3.0
Residential | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1.6	0.8
Residential | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.1	0.1
Residential | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1,984.3	1,531.4
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	833.6	213.9
Allowance for credit losses	(5.4)	(1.9)	(2.8)	(2.7)
Financing Receivable, Loan in Process	4.4	2.1
Agricultural | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.1	1.9
Agricultural | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	3.9	0.2
Agricultural | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.4	0.0
Agricultural | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	790.8	206.9
Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	12,232.4	6,731.4
Allowance for credit losses	(164.5)	(69.3)	(77.7)	(80.5)
Financing Receivable, Loan in Process	25.9	13.1
Total real estate loans | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	17.3	10.4
Total real estate loans | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	7.8	2.0
Total real estate loans | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.8	0.7
Total real estate loans | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	12,119.7	6,701.8
Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	739.6	737.6
Allowance for credit losses	(13.5)	(14.3)	(16.0)	(16.7)
Financing Receivable, Loan in Process	6.3	6.9
Indirect consumer | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	5.2	5.1
Indirect consumer | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.9	1.4
Indirect consumer | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.2	0.4
Indirect consumer | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	731.5	729.0
Direct and advance lines
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	142.5	129.2
Allowance for credit losses	(4.6)	(4.6)	(4.8)	(4.6)
Financing Receivable, Loan in Process	0.8	0.8
Direct and advance lines | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.5	0.5
Direct and advance lines | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.3	0.2
Direct and advance lines | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.1
Direct and advance lines | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	141.6	128.3
Credit card
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	73.5	64.9
Allowance for credit losses	(2.3)	(2.2)	(1.5)	(2.6)
Financing Receivable, Loan in Process	0.9	1.3
Credit card | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.3	0.6
Credit card | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.2	0.2
Credit card | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.4	0.5
Credit card | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	72.6	63.6
Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	955.6	931.7
Allowance for credit losses	(20.4)	(21.1)	(22.3)	(23.9)
Financing Receivable, Loan in Process	8.0	9.0
Total consumer loans | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	6.0	6.2
Total consumer loans | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1.4	1.8
Total consumer loans | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.6	1.0
Total consumer loans | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	945.7	920.9
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	3,017.9	1,475.5
Allowance for credit losses	(58.2)	(31.6)	(36.0)	(39.2)
Financing Receivable, Loan in Process	7.1	6.7
Commercial | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.0	4.9
Commercial | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	3.8	0.7
Commercial | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1.3	1.1
Commercial | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2,995.6	1,463.8
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	744.3	203.9
Allowance for credit losses	(4.1)	(0.3)	$ (0.6)	$ (0.7)
Financing Receivable, Loan in Process	16.1	0.7
Agricultural | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	11.4	0.7
Agricultural | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	4.7	0.0
Agricultural | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Agricultural | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	713.2	201.6
Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	4.6	1.5
Financing Receivable, Loan in Process	0.0	0.0
Other, including overdrafts | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Other, including overdrafts | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Other, including overdrafts | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.0	0.0
Other, including overdrafts | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	4.6	1.5
Loans And Leases Held For Investment [Member]
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	16,954.8	9,344.0
Financing Receivable, Loan in Process	57.1	29.5
Loans And Leases Held For Investment [Member] | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	36.7	22.2
Loans And Leases Held For Investment [Member] | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	17.7	4.5
Loans And Leases Held For Investment [Member] | Equal to or Greater than 90 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.7	2.8
Loans And Leases Held For Investment [Member] | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	$ 16,778.8	$ 9,289.6

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Loans Held for Investment - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 122.3	$ 144.3
Initial ACL Recorded for PCD loans	84.3
Provision for (reversal of) credit losses	61.3	(5.1)
Loans Charged-Off	(19.9)	(4.9)
Recoveries Collected	3.2	2.0
Ending balance	247.2	136.6
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	57.3	(4.8)
Great Western Bank
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	68.3
Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17.3	25.5
Initial ACL Recorded for PCD loans	24.1
Provision for (reversal of) credit losses	6.7	(2.5)
Loans Charged-Off	(2.9)	0.0
Recoveries Collected	0.0	0.0
Ending balance	45.2	23.0
Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13.3	18.3
Initial ACL Recorded for PCD loans	9.5
Provision for (reversal of) credit losses	4.6	(0.8)
Loans Charged-Off	(2.2)	(0.1)
Recoveries Collected	0.0	0.0
Ending balance	25.2	17.4
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13.3	11.0
Initial ACL Recorded for PCD loans	29.9
Provision for (reversal of) credit losses	11.4	0.8
Loans Charged-Off	0.0	0.0
Recoveries Collected	0.0	0.0
Ending balance	54.6	11.8
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	43.9	54.8
Initial ACL Recorded for PCD loans	63.5
Provision for (reversal of) credit losses	22.7	(2.5)
Loans Charged-Off	(5.1)	(0.1)
Recoveries Collected	0.0	0.0
Ending balance	125.0	52.2
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.3	0.7
Initial ACL Recorded for PCD loans	3.4
Provision for (reversal of) credit losses	(0.5)	(0.1)
Loans Charged-Off	(0.2)	0.0
Recoveries Collected	1.1	0.0
Ending balance	4.1	0.6
Commercial and floor plans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	27.1	34.2
Initial ACL Recorded for PCD loans	11.2
Provision for (reversal of) credit losses	18.4	(1.8)
Loans Charged-Off	(4.2)	(1.8)
Recoveries Collected	0.4	0.4
Ending balance	52.9	31.0
Commercial purpose secured by 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4.4	4.7
Initial ACL Recorded for PCD loans	0.2
Provision for (reversal of) credit losses	0.4	(0.2)
Loans Charged-Off	0.0	0.0
Recoveries Collected	0.0	0.2
Ending balance	5.0	4.7
Land acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.5	1.3
Initial ACL Recorded for PCD loans	3.4
Provision for (reversal of) credit losses	(0.8)	(0.2)
Loans Charged-Off	(2.7)	0.0
Recoveries Collected	0.1	0.1
Ending balance	0.5	1.2
Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.4	1.6
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	0.9	(0.2)
Loans Charged-Off	0.0	0.0
Recoveries Collected	0.0	0.0
Ending balance	3.3	1.4
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6.0	7.3
Initial ACL Recorded for PCD loans	0.2
Provision for (reversal of) credit losses	4.0	(0.2)
Loans Charged-Off	0.0	0.0
Recoveries Collected	0.0	0.1
Ending balance	10.2	7.2
Total construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8.9	10.2
Initial ACL Recorded for PCD loans	3.6
Provision for (reversal of) credit losses	4.1	(0.6)
Loans Charged-Off	(2.7)	0.0
Recoveries Collected	0.1	0.2
Ending balance	14.0	9.8
Residential 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13.4	11.4
Initial ACL Recorded for PCD loans	0.1
Provision for (reversal of) credit losses	5.2	0.1
Loans Charged-Off	(0.1)	0.0
Recoveries Collected	0.1	0.0
Ending balance	18.7	11.5
Home equity and HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.2	1.4
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	0.1	0.0
Loans Charged-Off	0.0	(0.1)
Recoveries Collected	0.1	0.1
Ending balance	1.4	1.4
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14.6	12.8
Initial ACL Recorded for PCD loans	0.1
Provision for (reversal of) credit losses	5.3	0.1
Loans Charged-Off	(0.1)	(0.1)
Recoveries Collected	0.2	0.1
Ending balance	20.1	12.9
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.9	2.7
Initial ACL Recorded for PCD loans	2.3
Provision for (reversal of) credit losses	6.4	0.1
Loans Charged-Off	(5.2)	0.0
Recoveries Collected	0.0	0.0
Ending balance	5.4	2.8
Total real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	69.3	80.5
Initial ACL Recorded for PCD loans	69.5
Provision for (reversal of) credit losses	38.5	(2.9)
Loans Charged-Off	(13.1)	(0.2)
Recoveries Collected	0.3	0.3
Ending balance	164.5	77.7
Indirect consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14.3	16.7
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	(0.3)	0.0
Loans Charged-Off	(0.9)	(1.3)
Recoveries Collected	0.4	0.6
Ending balance	13.5	16.0
Direct and advance lines
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4.6	4.6
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	(0.1)	0.7
Loans Charged-Off	(0.8)	(0.8)
Recoveries Collected	0.9	0.3
Ending balance	4.6	4.8
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.2	2.6
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	0.6	(0.7)
Loans Charged-Off	(0.6)	(0.6)
Recoveries Collected	0.1	0.2
Ending balance	2.3	1.5
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21.1	23.9
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	0.2	0.0
Loans Charged-Off	(2.3)	(2.7)
Recoveries Collected	1.4	1.1
Ending balance	20.4	22.3
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.1	0.3
Initial ACL Recorded for PCD loans	0.0
Provision for (reversal of) credit losses	0.3	0.2
Loans Charged-Off	(0.1)	(0.2)
Recoveries Collected	0.0	0.0
Ending balance	0.3	0.3
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31.6	39.2
Initial ACL Recorded for PCD loans	11.4
Provision for (reversal of) credit losses	19.1	(1.8)
Loans Charged-Off	(4.3)	(2.0)
Recoveries Collected	0.4	0.6
Ending balance	58.2	36.0
Agriculture Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.3	0.7
Initial ACL Recorded for PCD loans	3.4
Provision for (reversal of) credit losses	(0.5)	(0.1)
Loans Charged-Off	(0.2)	0.0
Recoveries Collected	1.1	0.0
Ending balance	$ 4.1	$ 0.6

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Loans Held for Investment - Schedule of Allowance for Credit Losses for Loans Held for Investment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 122.3	$ 144.3
Provision charged to operating expense	61.3	(5.1)
Loans Charged-Off	(19.9)	(4.9)
Ending balance	247.2	136.6
Financing Receivable, Allowance for Credit Loss, Recovery	3.2	2.0
Commercial Real Estate Non Owner Occupied Loans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17.3	25.5
Provision charged to operating expense	6.7	(2.5)
Loans Charged-Off	(2.9)	0.0
Ending balance	45.2	23.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Agricultural Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.3	0.7
Provision charged to operating expense	(0.5)	(0.1)
Loans Charged-Off	(0.2)	0.0
Ending balance	4.1	0.6
Financing Receivable, Allowance for Credit Loss, Recovery	1.1	0.0
Commercial and Floor Plans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	27.1	34.2
Provision charged to operating expense	18.4	(1.8)
Loans Charged-Off	(4.2)	(1.8)
Ending balance	52.9	31.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.4	0.4
Commercial Real Estate Owner Occupied [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13.3	18.3
Provision charged to operating expense	4.6	(0.8)
Loans Charged-Off	(2.2)	(0.1)
Ending balance	25.2	17.4
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Commercial Real Estate Multi-family [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13.3	11.0
Provision charged to operating expense	11.4	0.8
Loans Charged-Off	0.0	0.0
Ending balance	54.6	11.8
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Commercial real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	43.9	54.8
Provision charged to operating expense	22.7	(2.5)
Loans Charged-Off	(5.1)	(0.1)
Ending balance	125.0	52.2
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Land Acquisition And Development Construction Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.5	1.3
Provision charged to operating expense	(0.8)	(0.2)
Loans Charged-Off	(2.7)	0.0
Ending balance	0.5	1.2
Financing Receivable, Allowance for Credit Loss, Recovery	0.1	0.1
Residential construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.4	1.6
Provision charged to operating expense	0.9	(0.2)
Loans Charged-Off	0.0	0.0
Ending balance	3.3	1.4
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Commercial construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6.0	7.3
Provision charged to operating expense	4.0	(0.2)
Loans Charged-Off	0.0	0.0
Ending balance	10.2	7.2
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.1
Construction Loans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8.9	10.2
Provision charged to operating expense	4.1	(0.6)
Loans Charged-Off	(2.7)	0.0
Ending balance	14.0	9.8
Financing Receivable, Allowance for Credit Loss, Recovery	0.1	0.2
Residential Real Estate 1-4 Family [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13.4	11.4
Provision charged to operating expense	5.2	0.1
Loans Charged-Off	(0.1)	0.0
Ending balance	18.7	11.5
Financing Receivable, Allowance for Credit Loss, Recovery	0.1	0.0
Home Equity Line of Credit [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.2	1.4
Provision charged to operating expense	0.1	0.0
Loans Charged-Off	0.0	(0.1)
Ending balance	1.4	1.4
Financing Receivable, Allowance for Credit Loss, Recovery	0.1	0.1
Residential Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14.6	12.8
Provision charged to operating expense	5.3	0.1
Loans Charged-Off	(0.1)	(0.1)
Ending balance	20.1	12.9
Financing Receivable, Allowance for Credit Loss, Recovery	0.2	0.1
Agricultural Real Estate Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.9	2.7
Provision charged to operating expense	6.4	0.1
Loans Charged-Off	(5.2)	0.0
Ending balance	5.4	2.8
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Real Estate Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	69.3	80.5
Provision charged to operating expense	38.5	(2.9)
Loans Charged-Off	(13.1)	(0.2)
Ending balance	164.5	77.7
Financing Receivable, Allowance for Credit Loss, Recovery	0.3	0.3
Consumer Indirect Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14.3	16.7
Provision charged to operating expense	(0.3)	0.0
Loans Charged-Off	(0.9)	(1.3)
Ending balance	13.5	16.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.4	0.6
Direct consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4.6	4.6
Provision charged to operating expense	(0.1)	0.7
Loans Charged-Off	(0.8)	(0.8)
Ending balance	4.6	4.8
Financing Receivable, Allowance for Credit Loss, Recovery	0.9	0.3
Credit Card Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.2	2.6
Provision charged to operating expense	0.6	(0.7)
Loans Charged-Off	(0.6)	(0.6)
Ending balance	2.3	1.5
Financing Receivable, Allowance for Credit Loss, Recovery	0.1	0.2
Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21.1	23.9
Provision charged to operating expense	0.2	0.0
Loans Charged-Off	(2.3)	(2.7)
Ending balance	20.4	22.3
Financing Receivable, Allowance for Credit Loss, Recovery	1.4	1.1
Commercial Purpose secured by 1-4 Family [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4.4	4.7
Provision charged to operating expense	0.4	(0.2)
Loans Charged-Off	0.0	0.0
Ending balance	5.0	4.7
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.2
Commercial Borrower [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.1	0.3
Provision charged to operating expense	0.3	0.2
Loans Charged-Off	(0.1)	(0.2)
Ending balance	0.3	0.3
Financing Receivable, Allowance for Credit Loss, Recovery	0.0	0.0
Commercial Portfolio Segment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31.6	39.2
Provision charged to operating expense	19.1	(1.8)
Loans Charged-Off	(4.3)	(2.0)
Ending balance	58.2	36.0
Financing Receivable, Allowance for Credit Loss, Recovery	0.4	0.6
Agriculture Portfolio Segment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.3	0.7
Provision charged to operating expense	(0.5)	(0.1)
Loans Charged-Off	(0.2)	0.0
Ending balance	4.1	0.6
Financing Receivable, Allowance for Credit Loss, Recovery	$ 1.1	$ 0.0

XML

Loans Held for Investment - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Receivables [Abstract]
Loans renegotiated in troubled debt restructurings	$ 23,000,000		$ 6,200,000
Troubled restructurings included in non-accrual loans	8,300,000		3,900,000
Loans renegotiated in troubled debt restructurings, accrual loans	14,700,000		2,300,000
Financing receivable, after allowance for credit loss, noncurrent	600,000		100,000
TDR commitment to lend			$ 0
Troubled debt restructurings	17,200,000
Charge-offs directly related to modifying troubled debt restructurings	0	$ 0
Balance of defaulted loans under trouble debt restructurings	0
Impaired financing receivable, recorded investment	94,700,000
Commitments to purchase or sell	0	0
Proceeds from sale of loans held-for-investment	$ 0	$ 0

XML

Loans Held for Investment - Schedule of Recorded Investment in Impaired Loans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	$ (61.3)	$ 5.1
Accounts Receivable, Allowance for Credit Loss	247.2	136.6	$ 122.3	$ 144.3
Collateral dependent borrowings	101.1		11.7
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	57.3	(4.8)
Balance of defaulted loans under trouble debt restructurings	0.0
Impaired Financing Receivable, Interest Income, Accrual Method	0.0	0.0
Agriculture Portfolio Segment [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	0.5	0.1
Accounts Receivable, Allowance for Credit Loss	4.1	0.6	0.3	0.7
Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	(38.5)	2.9
Accounts Receivable, Allowance for Credit Loss	164.5	77.7	69.3	80.5
Collateral dependent borrowings	67.7		8.2
Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	(19.1)	1.8
Accounts Receivable, Allowance for Credit Loss	58.2	36.0	31.6	39.2
Collateral dependent borrowings	9.4		2.8
Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	0.5	0.1
Accounts Receivable, Allowance for Credit Loss	4.1	$ 0.6	0.3	$ 0.7
Collateral dependent borrowings	24.0		0.7
Business Assets Pledged as Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	5.0		3.0
Business Assets Pledged as Collateral [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.2		1.2
Business Assets Pledged as Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	4.8		1.8
Business Assets Pledged as Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.0		0.0
Real Property Pledged as Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	96.1		8.7
Real Property Pledged as Collateral [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	67.5		7.0
Real Property Pledged as Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	4.6		1.0
Real Property Pledged as Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	24.0		0.7
Other Property [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.0		0.0
Other Property [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.0		0.0
Other Property [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.0		0.0
Other Property [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	$ 0.0		$ 0.0

XML

Loans Held for Investment - Schedule of Contractual Aging of Loans by Portfolio (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Nonaccrual, Interest Income	$ 0		$ 0
Impaired Financing Receivable, Interest Income, Accrual Method	0	$ 0
Accrued interest reversal	1,000,000	$ 0
Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	900,000		1,300,000
Nonaccrual loans	0		0
Total Loans	73,500,000		64,900,000
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	9,700,000		2,700,000
Nonaccrual loans	37,400,000		8,000,000.0
Total Loans	7,805,700,000		3,971,500,000
Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	6,300,000		6,900,000
Nonaccrual loans	1,800,000		1,700,000
Total Loans	739,600,000		737,600,000
Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	800,000		800,000
Nonaccrual loans	100,000		100,000
Total Loans	142,500,000		129,200,000
Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,700,000		200,000
Nonaccrual loans	3,900,000		700,000
Total Loans	344,800,000		247,800,000
Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,600,000		4,200,000
Nonaccrual loans	0		0
Total Loans	406,000,000.0		262,000,000.0
Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	400,000		0
Nonaccrual loans	0		0
Total Loans	844,800,000		498,000,000.0
Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	5,700,000		4,400,000
Nonaccrual loans	3,900,000		700,000
Total Loans	1,595,600,000		1,007,800,000
Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	6,100,000		3,900,000
Nonaccrual loans	7,100,000		2,900,000
Total Loans	1,997,500,000		1,538,200,000
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,400,000		2,100,000
Nonaccrual loans	38,400,000		4,900,000
Total Loans	833,600,000		213,900,000
Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	25,900,000		13,100,000
Nonaccrual loans	86,800,000		16,500,000
Total Loans	12,232,400,000		6,731,400,000
Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	8,000,000.0		9,000,000.0
Nonaccrual loans	1,900,000		1,800,000
Total Loans	955,600,000		931,700,000
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	7,100,000		6,700,000
Nonaccrual loans	15,200,000		5,000,000.0
Total Loans	3,017,900,000		1,475,500,000
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	16,100,000		700,000
Nonaccrual loans	15,000,000.0		1,600,000
Total Loans	744,300,000		203,900,000
Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Nonaccrual loans	0		0
Total Loans	4,600,000		1,500,000
Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	57,100,000		29,500,000
Nonaccrual loans	118,900,000		24,900,000
Total Loans	16,954,800,000		9,344,000,000
30 to 59 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	300,000		600,000
30 to 59 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	7,200,000		1,100,000
30 to 59 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	5,200,000		5,100,000
30 to 59 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	500,000		500,000
30 to 59 Days Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,600,000		200,000
30 to 59 Days Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,600,000		4,200,000
30 to 59 Days Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	400,000		0
30 to 59 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	5,600,000		4,400,000
30 to 59 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,400,000		3,000,000.0
30 to 59 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	100,000		1,900,000
30 to 59 Days Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	17,300,000		10,400,000
30 to 59 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	6,000,000.0		6,200,000
30 to 59 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,000,000.0		4,900,000
30 to 59 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	11,400,000		700,000
30 to 59 Days Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
30 to 59 Days Past Due | Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	36,700,000		22,200,000
60 to 89 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	200,000		200,000
60 to 89 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,200,000		1,000,000.0
60 to 89 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	900,000		1,400,000
60 to 89 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	300,000		200,000
60 to 89 Days Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	100,000		0
60 to 89 Days Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
60 to 89 Days Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
60 to 89 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	100,000		0
60 to 89 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,600,000		800,000
60 to 89 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	3,900,000		200,000
60 to 89 Days Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	7,800,000		2,000,000.0
60 to 89 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,400,000		1,800,000
60 to 89 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	3,800,000		700,000
60 to 89 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,700,000		0
60 to 89 Days Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
60 to 89 Days Past Due | Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	17,700,000		4,500,000
Equal to or Greater than 90 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	400,000		500,000
Equal to or Greater than 90 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	300,000		600,000
Equal to or Greater than 90 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	200,000		400,000
Equal to or Greater than 90 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		100,000
Equal to or Greater than 90 Days Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Equal to or Greater than 90 Days Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Equal to or Greater than 90 Days Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Equal to or Greater than 90 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Equal to or Greater than 90 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	100,000		100,000
Equal to or Greater than 90 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	400,000		0
Equal to or Greater than 90 Days Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	800,000		700,000
Equal to or Greater than 90 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	600,000		1,000,000.0
Equal to or Greater than 90 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,300,000		1,100,000
Equal to or Greater than 90 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Equal to or Greater than 90 Days Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0
Equal to or Greater than 90 Days Past Due | Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,700,000		2,800,000
Financial Asset, Not Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	72,600,000		63,600,000
Financial Asset, Not Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	7,758,600,000		3,960,800,000
Financial Asset, Not Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	731,500,000		729,000,000.0
Financial Asset, Not Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	141,600,000		128,300,000
Financial Asset, Not Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	338,200,000		246,900,000
Financial Asset, Not Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	403,400,000		257,800,000
Financial Asset, Not Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	844,400,000		498,000,000.0
Financial Asset, Not Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,586,000,000		1,002,700,000
Financial Asset, Not Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,984,300,000		1,531,400,000
Financial Asset, Not Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	790,800,000		206,900,000
Financial Asset, Not Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	12,119,700,000		6,701,800,000
Financial Asset, Not Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	945,700,000		920,900,000
Financial Asset, Not Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,995,600,000		1,463,800,000
Financial Asset, Not Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	713,200,000		201,600,000
Financial Asset, Not Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,600,000		1,500,000
Financial Asset, Not Past Due | Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	$ 16,778,800,000		$ 9,289,600,000

XML

Loans Held for Investment - Schedule of Troubled Debt Restructurings (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) note
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note	5
Troubled debt restructurings	$ 17.2
Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	3.2
Extension of term or amortization schedule
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	13.6
Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Other Loan Restructuring Modification
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 0.4
Commercial Real Estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note	2
Troubled debt restructurings	$ 7.4
Commercial Real Estate | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	3.2
Commercial Real Estate | Extension of term or amortization schedule
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	4.2
Commercial Real Estate | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Commercial Real Estate | Other Loan Restructuring Modification
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 0.0
Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note	1
Troubled debt restructurings	$ 0.5
Residential | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Residential | Extension of term or amortization schedule
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.5
Residential | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Residential | Other Loan Restructuring Modification
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 0.0
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note	1
Troubled debt restructurings	$ 8.9
Agricultural | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Agricultural | Extension of term or amortization schedule
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	8.9
Agricultural | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Agricultural | Other Loan Restructuring Modification
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 0.0
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Number of Notes | note	1
Troubled debt restructurings	$ 0.4
Commercial | Interest only period
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Commercial | Extension of term or amortization schedule
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Commercial | Interest rate adjustment
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	0.0
Commercial | Other Loan Restructuring Modification
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructurings	$ 0.4

XML

Loans Held for Investment - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($)

3 Months Ended

Mar. 31, 2022

Mar. 31, 2021

Dec. 31, 2021

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Impaired financing receivable, recorded investment

$ 94,700,000

Commitments to purchase or sell

0

$ 0

Proceeds from sale of loans held-for-investment

$ 0

$ 0

Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator

The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale for the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	182.1	$	845.0	$	737.0	$	517.2	$	344.9	$	1,023.6	$	67.6	$	3,717.4
Special mention	—		33.4		5.9		21.6		34.0		37.1		—		132.0
Substandard	3.7		21.5		25.5		49.8		36.8		27.8		23.8		188.9
Doubtful	—		0.3		—		—		—		—		—		0.3
Total	$	185.8	$	900.2	$	768.4	$	588.6	$	415.7	$	1,088.5	$	91.4	$	4,038.6
Commercial real estate owner occupied:
Pass	$	189.4	$	843.8	$	585.4	$	336.9	$	220.4	$	585.0	$	54.7	$	2,815.6
Special mention	0.7		3.2		4.2		8.5		7.9		15.7		0.1		40.3
Substandard	6.8		6.1		4.2		6.3		15.4		22.0		0.2		61.0
Doubtful	—		—		—		—		1.8		2.0		—		3.8
Total	$	196.9	$	853.1	$	593.8	$	351.7	$	245.5	$	624.7	$	55.0	$	2,920.7

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial multi-family:
Pass	$	86.2	$	218.9	$	194.7	$	62.2	$	45.5	$	141.1	$	4.7	$	753.3
Special mention	—		—		—		—		—		0.1		—		0.1
Substandard	—		—		37.7		1.2		47.2		0.3		—		86.4
Doubtful	—		—		6.6		—		—		—		—		6.6
Total	$	86.2	$	218.9	$	239.0	$	63.4	$	92.7	$	141.5	$	4.7	$	846.4
Land, acquisition and development:
Pass	$	25.3	$	175.2	$	43.4	$	28.8	$	16.2	$	37.5	$	13.2	$	339.6
Special mention	—		—		0.1		—		0.2		0.4		—		0.7
Substandard	—		0.7		0.2		—		—		0.4		—		1.3
Doubtful	—		3.2		—		—		—		—		—		3.2
Total	$	25.3	$	179.1	$	43.7	$	28.8	$	16.4	$	38.3	$	13.2	$	344.8
Residential construction:
Pass	$	29.7	$	165.4	$	6.7	$	10.3	$	0.8	$	6.4	$	185.9	$	405.2
Substandard	—		—		0.4		—		—		0.4		—		0.8
Total	$	29.7	$	165.4	$	7.1	$	10.3	$	0.8	$	6.8	$	185.9	$	406.0
Commercial construction:
Pass	$	118.2	$	353.6	$	201.4	$	161.6	$	6.6	$	0.6	$	0.4	$	842.4
Substandard	—		—		—		2.4		—		—		—		2.4
Total	$	118.2	$	353.6	$	201.4	$	164.0	$	6.6	$	0.6	$	0.4	$	844.8
Agricultural real estate:
Pass	$	44.2	$	220.5	$	132.1	$	76.7	$	59.7	$	131.8	$	56.2	$	721.2
Special mention	—		7.1		2.8		1.2		12.7		7.6		10.0		41.4
Substandard	0.8		18.1		5.4		5.0		20.0		17.8		—		67.1
Doubtful	—		0.2		1.2		—		—		2.5		—		3.9
Total	$	45.0	$	245.9	$	141.5	$	82.9	$	92.4	$	159.7	$	66.2	$	833.6
Commercial and floor plans:
Pass	$	142.4	$	582.5	$	282.5	$	169.5	$	162.9	$	233.4	$	818.5	$	2,391.7
Special mention	—		4.1		0.6		1.1		1.3		3.0		18.1		28.2
Substandard	9.2		7.6		5.1		2.2		5.4		8.8		16.1		54.4
Doubtful	—		—		—		—		—		3.3		0.2		3.5
Total	$	151.6	$	594.2	$	288.2	$	172.8	$	169.6	$	248.5	$	852.9	$	2,477.8
Commercial purpose secured by 1-4 family:
Pass	$	48.0	$	152.9	$	78.0	$	37.6	$	35.5	$	53.3	$	15.5	$	420.8
Special mention	—		0.2		0.6		0.6		2.0		0.7		—		4.1
Substandard	0.1		1.3		1.2		0.7		0.5		1.5		0.1		5.4
Total	$	48.1	$	154.4	$	79.8	$	38.9	$	38.0	$	55.5	$	15.6	$	430.3
Agricultural:
Pass	$	25.9	$	137.5	$	40.6	$	15.1	$	12.3	$	9.5	$	396.4	$	637.3
Special mention	0.4		3.1		0.7		1.2		2.7		0.3		17.9		26.3
Substandard	1.8		25.8		6.8		0.9		4.4		1.1		34.8		75.6
Doubtful	—		—		—		—		2.5		0.9		—		3.4
Total	$	28.1	$	166.4	$	48.1	$	17.2	$	21.9	$	11.8	$	449.1	$	742.6

	December 31, 2021
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2021		2020		2019		2018		2017		Prior		Revolving Loans Amortized Cost Basis		Total
Commercial real estate non-owner occupied:
Pass	$	507.9	$	452.2	$	237.9	$	150.4	$	76.3	$	409.0	$	15.3	$	1,849.0
Special mention	0.2		3.1		2.1		—		—		3.6		—		9.0
Substandard	3.9		15.3		2.3		0.7		1.0		12.4		—		35.6
Total	$	512.0	$	470.6	$	242.3	$	151.1	$	77.3	$	425.0	$	15.3	$	1,893.6
Commercial real estate owner occupied:
Pass	$	452.7	$	314.9	$	235.0	$	151.0	$	94.5	$	322.5	$	14.2	$	1,584.8
Special mention	1.3		3.2		1.5		7.4		3.5		13.8		—		30.7
Substandard	3.8		4.3		4.7		5.4		2.7		20.3		—		41.2
Total	$	457.8	$	322.4	$	241.2	$	163.8	$	100.7	$	356.6	$	14.2	$	1,656.7
Commercial multi-family:
Pass	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Total	$	129.1	$	118.6	$	43.9	$	15.4	$	36.0	$	76.7	$	1.5	$	421.2
Land, acquisition and development:
Pass	$	113.0	$	41.5	$	34.2	$	14.8	$	19.8	$	20.8	$	1.2	$	245.3
Special mention	—		0.1		—		—		0.1		0.3		—		0.5
Substandard	0.8		0.2		—		0.6		0.3		0.1		—		2.0
Total	$	113.8	$	41.8	$	34.2	$	15.4	$	20.2	$	21.2	$	1.2	$	247.8
Residential construction:
Pass	$	112.4	$	7.0	$	13.7	$	0.9	$	—	$	—	$	127.2	$	261.2
Substandard	—		0.4		—		—		0.4		—		—		0.8
Total	$	112.4	$	7.4	$	13.7	$	0.9	$	0.4	$	—	$	127.2	$	262.0
Commercial construction:
Pass	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Total	$	209.7	$	141.4	$	118.8	$	27.6	$	—	$	0.5	$	—	$	498.0
Agricultural real estate:
Pass	$	58.3	$	36.9	$	35.1	$	22.6	$	11.8	$	28.1	$	4.9	$	197.7
Special mention	0.1		1.3		1.2		0.1		0.1		0.9		0.9		4.6
Substandard	4.0		0.4		1.0		0.6		1.3		4.3		—		11.6
Total	$	62.4	$	38.6	$	37.3	$	23.3	$	13.2	$	33.3	$	5.8	$	213.9
Commercial and floor plans:
Pass	$	394.2	$	165.7	$	94.5	$	73.5	$	47.1	$	91.3	$	224.7	$	1,091.0
Special mention	0.8		11.4		0.8		0.8		3.0		2.3		7.0		26.1
Substandard	1.3		2.8		1.6		2.6		0.6		4.1		2.6		15.6
Total	$	396.3	$	179.9	$	96.9	$	76.9	$	50.7	$	97.7	$	234.3	$	1,132.7
Commercial purpose secured by 1-4 family:
Pass	$	94.9	$	55.0	$	27.8	$	23.1	$	15.3	$	32.2	$	14.4	$	262.7
Special mention	—		0.2		0.2		0.5		0.1		0.6		—		1.6
Substandard	1.3		1.2		0.6		0.6		0.2		1.3		0.1		5.3
Total	$	96.2	$	56.4	$	28.6	$	24.2	$	15.6	$	34.1	$	14.5	$	269.6
Agricultural:
Pass	$	35.1	$	16.2	$	9.0	$	5.4	$	2.1	$	1.6	$	108.9	$	178.3
Special mention	0.2		4.1		0.1		0.4		0.6		0.3		7.0		12.7
Substandard	4.9		0.7		0.6		2.5		—		0.1		2.6		11.4
Total	$	40.2	$	21.0	$	9.7	$	8.3	$	2.7	$	2.0	$	118.5	$	202.4

The following tables present the recorded investment of our other loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated:

	March 31, 2022
	Term Loans Amortized Cost Basis by Origination Year
Risk by Collateral	2022		2021		2020		2019		2018		Prior		Revolving Loans Amortized Cost Basis		Total
Residential 1-4 family:
Performing	$	34.5	$	446.5	$	581.5	$	112.5	$	35.5	$	260.3	$	0.9	$	1,471.7
Nonperforming	—		—		0.1		0.3		0.3		3.8		—		4.5
Total	$	34.5	$	446.5	$	581.6	$	112.8	$	35.8	$	264.1	$	0.9	$	1,476.2
Consumer home equity and HELOC:
Performing	$	4.6	$	16.5	$	10.6	$	5.8	$	6.9	$	19.5	$	454.8	$	518.7
Nonperforming	—		0.5		0.2		0.2		0.1		1.1		0.5		2.6
Total	$	4.6	$	17.0	$	10.8	$	6.0	$	7.0	$	20.6	$	455.3	$	521.3
Consumer indirect:
Performing	$	78.4	$	251.6	$	187.0	$	94.4	$	54.9	$	71.3	$	—	$	737.6
Nonperforming	—		0.5		0.5		0.3		0.2		0.5		—		2.0
Total	$	78.4	$	252.1	$	187.5	$	94.7	$	55.1	$	71.8	$	—	$	739.6
Consumer direct and advance line:
Performing	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5
Total	$	13.4	$	42.4	$	25.7	$	13.8	$	11.1	$	12.4	$	23.7	$	142.5

The following table presents the recorded investment in credit card loans based on payment activity for the periods indicated:

As of March 31, 2022	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	73.1	$	109.5	$	1.8	$	184.4
Nonperforming	0.4		0.3		—		0.7
Total credit card	$	73.5	$	109.8	$	1.8	$	185.1

As of December 31, 2021	Consumer		Commercial		Agricultural		Total
Credit Card:
Performing	$	64.4	$	73.1	$	1.5	$	139.0
Nonperforming	0.5		0.1		—		0.6
Total credit card	$	64.9	$	73.2	$	1.5	$	139.6

In the normal course of business, th

Non-owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

$ 185,800,000

$ 512,000,000.0

2019

900,200,000

470,600,000

2018

768,400,000

242,300,000

2017

588,600,000

151,100,000

2016

415,700,000

77,300,000

Prior

1,088,500,000

425,000,000.0

Revolving Loans Amortized Cost Basis

91,400,000

15,300,000

Total

4,038,600,000

1,893,600,000

Commercial

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Loans held for investment

7,805,700,000

3,971,500,000

Land acquisition & development

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

25,300,000

113,800,000

2019

179,100,000

41,800,000

2018

43,700,000

34,200,000

2017

28,800,000

15,400,000

2016

16,400,000

20,200,000

Prior

38,300,000

21,200,000

Revolving Loans Amortized Cost Basis

13,200,000

1,200,000

Total

344,800,000

247,800,000

Loans held for investment

344,800,000

247,800,000

Residential

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

29,700,000

112,400,000

2019

165,400,000

7,400,000

2018

7,100,000

13,700,000

2017

10,300,000

900,000

2016

800,000

400,000

Prior

6,800,000

0

Revolving Loans Amortized Cost Basis

185,900,000

127,200,000

Total

406,000,000.0

262,000,000.0

Loans held for investment

406,000,000.0

262,000,000.0

Commercial

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

118,200,000

209,700,000

2019

353,600,000

141,400,000

2018

201,400,000

118,800,000

2017

164,000,000.0

27,600,000

2016

6,600,000

0

Prior

600,000

500,000

Revolving Loans Amortized Cost Basis

400,000

0

Total

844,800,000

498,000,000.0

Loans held for investment

844,800,000

498,000,000.0

Residential

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Loans held for investment

1,997,500,000

1,538,200,000

Total construction loans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Loans held for investment

1,595,600,000

1,007,800,000

Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

45,000,000.0

62,400,000

2019

245,900,000

38,600,000

2018

141,500,000

37,300,000

2017

82,900,000

23,300,000

2016

92,400,000

13,200,000

Prior

159,700,000

33,300,000

Revolving Loans Amortized Cost Basis

66,200,000

5,800,000

Total

833,600,000

213,900,000

Loans held for investment

833,600,000

213,900,000

Total real estate loans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Loans held for investment

12,232,400,000

6,731,400,000

Indirect consumer

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

78,400,000

273,100,000

2019

252,100,000

209,100,000

2018

187,500,000

108,700,000

2017

94,700,000

64,200,000

2016

55,100,000

37,100,000

Prior

71,800,000

45,400,000

Revolving Loans Amortized Cost Basis

0

0

Total

739,600,000

737,600,000

Loans held for investment

739,600,000

737,600,000

Direct consumer

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

13,400,000

42,600,000

2019

42,400,000

27,900,000

2018

25,700,000

15,000,000.0

2017

13,800,000

13,400,000

2016

11,100,000

5,800,000

Prior

12,400,000

7,600,000

Revolving Loans Amortized Cost Basis

23,700,000

16,900,000

Total

142,500,000

129,200,000

Loans held for investment

142,500,000

129,200,000

Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

185,100,000

139,600,000

Loans held for investment

73,500,000

64,900,000

Total consumer loans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Loans held for investment

955,600,000

931,700,000

Commercial

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

Loans held for investment

3,017,900,000

1,475,500,000

Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

40,200,000

2019

21,000,000.0

2018

9,700,000

2017

8,300,000

2016

2,700,000

Prior

2,000,000.0

Revolving Loans Amortized Cost Basis

118,500,000

Total

202,400,000

Loans held for investment

744,300,000

203,900,000

Owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

196,900,000

457,800,000

2019

853,100,000

322,400,000

2018

593,800,000

241,200,000

2017

351,700,000

163,800,000

2016

245,500,000

100,700,000

Prior

624,700,000

356,600,000

Revolving Loans Amortized Cost Basis

55,000,000.0

14,200,000

Total

2,920,700,000

1,656,700,000

Multi-family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

86,200,000

129,100,000

2019

218,900,000

118,600,000

2018

239,000,000.0

43,900,000

2017

63,400,000

15,400,000

2016

92,700,000

36,000,000.0

Prior

141,500,000

76,700,000

Revolving Loans Amortized Cost Basis

4,700,000

1,500,000

Total

846,400,000

421,200,000

Commercial and floor plans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

151,600,000

396,300,000

2019

594,200,000

179,900,000

2018

288,200,000

96,900,000

2017

172,800,000

76,900,000

2016

169,600,000

50,700,000

Prior

248,500,000

97,700,000

Revolving Loans Amortized Cost Basis

852,900,000

234,300,000

Total

2,477,800,000

1,132,700,000

Commercial purpose secured by 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

48,100,000

96,200,000

2019

154,400,000

56,400,000

2018

79,800,000

28,600,000

2017

38,900,000

24,200,000

2016

38,000,000.0

15,600,000

Prior

55,500,000

34,100,000

Revolving Loans Amortized Cost Basis

15,600,000

14,500,000

Total

430,300,000

269,600,000

Agriculture Portfolio Segment [Member]

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

28,100,000

2019

166,400,000

2018

48,100,000

2017

17,200,000

2016

21,900,000

Prior

11,800,000

Revolving Loans Amortized Cost Basis

449,100,000

Total

742,600,000

Residential 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

34,500,000

360,900,000

2019

446,500,000

477,300,000

2018

581,600,000

74,700,000

2017

112,800,000

27,500,000

2016

35,800,000

25,900,000

Prior

264,100,000

177,300,000

Revolving Loans Amortized Cost Basis

900,000

0

Total

1,476,200,000

1,143,600,000

Consumer Home Equity and HELOC

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

4,600,000

11,400,000

2019

17,000,000.0

7,000,000.0

2018

10,800,000

4,000,000.0

2017

6,000,000.0

4,800,000

2016

7,000,000.0

4,200,000

Prior

20,600,000

12,500,000

Revolving Loans Amortized Cost Basis

455,300,000

350,700,000

Total

521,300,000

394,600,000

Pass | Non-owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

182,100,000

507,900,000

2019

845,000,000.0

452,200,000

2018

737,000,000.0

237,900,000

2017

517,200,000

150,400,000

2016

344,900,000

76,300,000

Prior

1,023,600,000

409,000,000.0

Revolving Loans Amortized Cost Basis

67,600,000

15,300,000

Total

3,717,400,000

1,849,000,000

Pass | Land acquisition & development

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

25,300,000

113,000,000.0

2019

175,200,000

41,500,000

2018

43,400,000

34,200,000

2017

28,800,000

14,800,000

2016

16,200,000

19,800,000

Prior

37,500,000

20,800,000

Revolving Loans Amortized Cost Basis

13,200,000

1,200,000

Total

339,600,000

245,300,000

Pass | Residential

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

29,700,000

112,400,000

2019

165,400,000

7,000,000.0

2018

6,700,000

13,700,000

2017

10,300,000

900,000

2016

800,000

0

Prior

6,400,000

0

Revolving Loans Amortized Cost Basis

185,900,000

127,200,000

Total

405,200,000

261,200,000

Pass | Commercial

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

118,200,000

209,700,000

2019

353,600,000

141,400,000

2018

201,400,000

118,800,000

2017

161,600,000

27,600,000

2016

6,600,000

0

Prior

600,000

500,000

Revolving Loans Amortized Cost Basis

400,000

0

Total

842,400,000

498,000,000.0

Pass | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

44,200,000

58,300,000

2019

220,500,000

36,900,000

2018

132,100,000

35,100,000

2017

76,700,000

22,600,000

2016

59,700,000

11,800,000

Prior

131,800,000

28,100,000

Revolving Loans Amortized Cost Basis

56,200,000

4,900,000

Total

721,200,000

197,700,000

Pass | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

35,100,000

2019

16,200,000

2018

9,000,000.0

2017

5,400,000

2016

2,100,000

Prior

1,600,000

Revolving Loans Amortized Cost Basis

108,900,000

Total

178,300,000

Pass | Owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

189,400,000

452,700,000

2019

843,800,000

314,900,000

2018

585,400,000

235,000,000.0

2017

336,900,000

151,000,000.0

2016

220,400,000

94,500,000

Prior

585,000,000.0

322,500,000

Revolving Loans Amortized Cost Basis

54,700,000

14,200,000

Total

2,815,600,000

1,584,800,000

Pass | Multi-family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

86,200,000

129,100,000

2019

218,900,000

118,600,000

2018

194,700,000

43,900,000

2017

62,200,000

15,400,000

2016

45,500,000

36,000,000.0

Prior

141,100,000

76,700,000

Revolving Loans Amortized Cost Basis

4,700,000

1,500,000

Total

753,300,000

421,200,000

Pass | Commercial and floor plans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

142,400,000

394,200,000

2019

582,500,000

165,700,000

2018

282,500,000

94,500,000

2017

169,500,000

73,500,000

2016

162,900,000

47,100,000

Prior

233,400,000

91,300,000

Revolving Loans Amortized Cost Basis

818,500,000

224,700,000

Total

2,391,700,000

1,091,000,000

Pass | Commercial purpose secured by 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

48,000,000.0

94,900,000

2019

152,900,000

55,000,000.0

2018

78,000,000.0

27,800,000

2017

37,600,000

23,100,000

2016

35,500,000

15,300,000

Prior

53,300,000

32,200,000

Revolving Loans Amortized Cost Basis

15,500,000

14,400,000

Total

420,800,000

262,700,000

Pass | Agriculture Portfolio Segment [Member]

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

25,900,000

2019

137,500,000

2018

40,600,000

2017

15,100,000

2016

12,300,000

Prior

9,500,000

Revolving Loans Amortized Cost Basis

396,400,000

Total

637,300,000

Other Assets Especially Mentioned | Non-owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

200,000

2019

33,400,000

3,100,000

2018

5,900,000

2,100,000

2017

21,600,000

0

2016

34,000,000.0

0

Prior

37,100,000

3,600,000

Revolving Loans Amortized Cost Basis

0

0

Total

132,000,000.0

9,000,000.0

Other Assets Especially Mentioned | Land acquisition & development

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

0

2019

0

100,000

2018

100,000

0

2017

0

0

2016

200,000

100,000

Prior

400,000

300,000

Revolving Loans Amortized Cost Basis

0

0

Total

700,000

500,000

Other Assets Especially Mentioned | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

100,000

2019

7,100,000

1,300,000

2018

2,800,000

1,200,000

2017

1,200,000

100,000

2016

12,700,000

100,000

Prior

7,600,000

900,000

Revolving Loans Amortized Cost Basis

10,000,000.0

900,000

Total

41,400,000

4,600,000

Other Assets Especially Mentioned | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

200,000

2019

4,100,000

2018

100,000

2017

400,000

2016

600,000

Prior

300,000

Revolving Loans Amortized Cost Basis

7,000,000.0

Total

12,700,000

Other Assets Especially Mentioned | Owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

700,000

1,300,000

2019

3,200,000

3,200,000

2018

4,200,000

1,500,000

2017

8,500,000

7,400,000

2016

7,900,000

3,500,000

Prior

15,700,000

13,800,000

Revolving Loans Amortized Cost Basis

100,000

0

Total

40,300,000

30,700,000

Other Assets Especially Mentioned | Multi-family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

0

2017

0

2016

0

Prior

100,000

Revolving Loans Amortized Cost Basis

0

Total

100,000

Other Assets Especially Mentioned | Commercial and floor plans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

800,000

2019

4,100,000

11,400,000

2018

600,000

800,000

2017

1,100,000

800,000

2016

1,300,000

3,000,000.0

Prior

3,000,000.0

2,300,000

Revolving Loans Amortized Cost Basis

18,100,000

7,000,000.0

Total

28,200,000

26,100,000

Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

0

2019

200,000

200,000

2018

600,000

200,000

2017

600,000

500,000

2016

2,000,000.0

100,000

Prior

700,000

600,000

Revolving Loans Amortized Cost Basis

0

0

Total

4,100,000

1,600,000

Other Assets Especially Mentioned | Agriculture Portfolio Segment [Member]

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

400,000

2019

3,100,000

2018

700,000

2017

1,200,000

2016

2,700,000

Prior

300,000

Revolving Loans Amortized Cost Basis

17,900,000

Total

26,300,000

Substandard | Non-owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

3,700,000

3,900,000

2019

21,500,000

15,300,000

2018

25,500,000

2,300,000

2017

49,800,000

700,000

2016

36,800,000

1,000,000.0

Prior

27,800,000

12,400,000

Revolving Loans Amortized Cost Basis

23,800,000

0

Total

188,900,000

35,600,000

Substandard | Land acquisition & development

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

800,000

2019

700,000

200,000

2018

200,000

0

2017

0

600,000

2016

0

300,000

Prior

400,000

100,000

Revolving Loans Amortized Cost Basis

0

0

Total

1,300,000

2,000,000.0

Substandard | Residential

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

0

2019

0

400,000

2018

400,000

0

2017

0

0

2016

0

400,000

Prior

400,000

0

Revolving Loans Amortized Cost Basis

0

0

Total

800,000

800,000

Substandard | Commercial

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

0

2017

2,400,000

2016

0

Prior

0

Revolving Loans Amortized Cost Basis

0

Total

2,400,000

Substandard | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

800,000

4,000,000.0

2019

18,100,000

400,000

2018

5,400,000

1,000,000.0

2017

5,000,000.0

600,000

2016

20,000,000.0

1,300,000

Prior

17,800,000

4,300,000

Revolving Loans Amortized Cost Basis

0

0

Total

67,100,000

11,600,000

Substandard | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

4,900,000

2019

700,000

2018

600,000

2017

2,500,000

2016

0

Prior

100,000

Revolving Loans Amortized Cost Basis

2,600,000

Total

11,400,000

Substandard | Owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

6,800,000

3,800,000

2019

6,100,000

4,300,000

2018

4,200,000

4,700,000

2017

6,300,000

5,400,000

2016

15,400,000

2,700,000

Prior

22,000,000.0

20,300,000

Revolving Loans Amortized Cost Basis

200,000

0

Total

61,000,000.0

41,200,000

Substandard | Multi-family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

37,700,000

2017

1,200,000

2016

47,200,000

Prior

300,000

Revolving Loans Amortized Cost Basis

0

Total

86,400,000

Substandard | Commercial and floor plans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

9,200,000

1,300,000

2019

7,600,000

2,800,000

2018

5,100,000

1,600,000

2017

2,200,000

2,600,000

2016

5,400,000

600,000

Prior

8,800,000

4,100,000

Revolving Loans Amortized Cost Basis

16,100,000

2,600,000

Total

54,400,000

15,600,000

Substandard | Commercial purpose secured by 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

100,000

1,300,000

2019

1,300,000

1,200,000

2018

1,200,000

600,000

2017

700,000

600,000

2016

500,000

200,000

Prior

1,500,000

1,300,000

Revolving Loans Amortized Cost Basis

100,000

100,000

Total

5,400,000

5,300,000

Substandard | Agriculture Portfolio Segment [Member]

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

1,800,000

2019

25,800,000

2018

6,800,000

2017

900,000

2016

4,400,000

Prior

1,100,000

Revolving Loans Amortized Cost Basis

34,800,000

Total

75,600,000

Doubtful | Non-owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

300,000

2018

0

2017

0

2016

0

Prior

0

Revolving Loans Amortized Cost Basis

0

Total

300,000

Doubtful | Land acquisition & development

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

3,200,000

2018

0

2017

0

2016

0

Prior

0

Revolving Loans Amortized Cost Basis

0

Total

3,200,000

Doubtful | Agricultural

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

200,000

2018

1,200,000

2017

0

2016

0

Prior

2,500,000

Revolving Loans Amortized Cost Basis

0

Total

3,900,000

Doubtful | Owner occupied

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

0

2017

0

2016

1,800,000

Prior

2,000,000.0

Revolving Loans Amortized Cost Basis

0

Total

3,800,000

Doubtful | Multi-family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

6,600,000

2017

0

2016

0

Prior

0

Revolving Loans Amortized Cost Basis

0

Total

6,600,000

Doubtful | Commercial and floor plans

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

0

2017

0

2016

0

Prior

3,300,000

Revolving Loans Amortized Cost Basis

200,000

Total

3,500,000

Doubtful | Agriculture Portfolio Segment [Member]

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

2019

0

2018

0

2017

0

2016

2,500,000

Prior

900,000

Revolving Loans Amortized Cost Basis

0

Total

3,400,000

Performing | Indirect consumer

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

78,400,000

272,600,000

2019

251,600,000

208,600,000

2018

187,000,000.0

108,300,000

2017

94,400,000

64,000,000.0

2016

54,900,000

37,000,000.0

Prior

71,300,000

45,000,000.0

Revolving Loans Amortized Cost Basis

0

0

Total

737,600,000

735,500,000

Performing | Direct consumer

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

13,400,000

42,500,000

2019

42,400,000

27,900,000

2018

25,700,000

15,000,000.0

2017

13,800,000

13,300,000

2016

11,100,000

5,800,000

Prior

12,400,000

7,600,000

Revolving Loans Amortized Cost Basis

23,700,000

16,900,000

Total

142,500,000

129,000,000.0

Performing | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

184,400,000

139,000,000.0

Performing | Residential 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

34,500,000

360,900,000

2019

446,500,000

477,000,000.0

2018

581,500,000

74,700,000

2017

112,500,000

27,500,000

2016

35,500,000

25,700,000

Prior

260,300,000

176,500,000

Revolving Loans Amortized Cost Basis

900,000

0

Total

1,471,700,000

1,142,300,000

Performing | Consumer Home Equity and HELOC

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

4,600,000

11,100,000

2019

16,500,000

7,000,000.0

2018

10,600,000

3,700,000

2017

5,800,000

4,800,000

2016

6,900,000

3,600,000

Prior

19,500,000

12,000,000.0

Revolving Loans Amortized Cost Basis

454,800,000

350,700,000

Total

518,700,000

392,900,000

Nonperforming | Indirect consumer

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

500,000

2019

500,000

500,000

2018

500,000

400,000

2017

300,000

200,000

2016

200,000

100,000

Prior

500,000

400,000

Revolving Loans Amortized Cost Basis

0

0

Total

2,000,000.0

2,100,000

Nonperforming | Direct consumer

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

100,000

2019

0

2018

0

2017

100,000

2016

0

Prior

0

Revolving Loans Amortized Cost Basis

0

Total

200,000

Nonperforming | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

700,000

600,000

Nonperforming | Residential 1-4 family

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

0

2019

0

300,000

2018

100,000

0

2017

300,000

0

2016

300,000

200,000

Prior

3,800,000

800,000

Revolving Loans Amortized Cost Basis

0

0

Total

4,500,000

1,300,000

Nonperforming | Consumer Home Equity and HELOC

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

300,000

2019

500,000

0

2018

200,000

300,000

2017

200,000

0

2016

100,000

600,000

Prior

1,100,000

500,000

Revolving Loans Amortized Cost Basis

500,000

0

Total

2,600,000

1,700,000

Agriculture Portfolio Segment [Member] | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

1,800,000

1,500,000

Agriculture Portfolio Segment [Member] | Performing | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

1,800,000

1,500,000

Agriculture Portfolio Segment [Member] | Nonperforming | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

0

0

Commercial | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

109,800,000

73,200,000

Commercial | Performing | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

109,500,000

73,100,000

Commercial | Nonperforming | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

300,000

100,000

Total consumer loans | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

73,500,000

64,900,000

Total consumer loans | Performing | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

73,100,000

64,400,000

Total consumer loans | Nonperforming | Credit card

Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]

2020

$ 400,000

$ 500,000

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Loans Held for Investment - Schedule of PCD Loans (Details) - USD ($) $ in Millions	Feb. 01, 2022	Mar. 31, 2022
Receivables [Abstract]
Purchase price (initial fair value)	$ 606.9
Allowance for credit losses	(323.0)	$ (323.0)
Non-credit discount at acquisition	49.3
Par value (unpaid principal balance)	979.2
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases	238.7
Business Combination, Impact On Purchased Credit Deteriorated Loans	84.3
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Difference Between Amortized Cost Basis And Unpaid Principal Balance	31.2
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Interest Applied To Principal	$ 18.1

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Other Real Estate Owned (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	$ 2.0	$ 2.2	$ 2.5
OREO acquired through acquisition	15.8	$ 0.0
Additions	0.0		0.3
Dispositions	(0.3)		(0.6)
Ending balance	17.5		$ 2.2
Carrying values of foreclosed residential real estate properties	0.2			$ 0.2
Consumer mortgage loans collateralized by residential real estate property in the process of foreclosure	$ 0.4			$ 0.2

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Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	$ 2,715.9	$ 1,691.2
Derivative Asset, Estimated Fair Value	26.9	28.1
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,983.1	1,103.9
Derivative Liabilities, Estimated Fair Value		18.2
Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	46.4	87.6
Derivative Asset, Estimated Fair Value	0.0	0.1
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	1,827.1	913.9
Derivative Asset, Estimated Fair Value	0.3	22.2
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,827.1	913.9
Derivative Liabilities, Estimated Fair Value	62.3	18.1
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	107.6	77.3
Derivative Asset, Estimated Fair Value	0.0	1.8
Not Designated as Hedging Instrument | Forward loan sales contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	81.2	0.0
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	0.0	102.4
Derivative Liabilities, Estimated Fair Value	0.0	0.0
Designated as Hedging Instrument [Member] | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	700.0	700.0
Derivative Asset, Estimated Fair Value	$ 25.3	$ 4.1

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Derivatives and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Financial Assets
Gross Amounts Recognized	$ 26.9		$ 28.1
Gross Amounts Offset in the Balance Sheet	0.0		0.0
Net Amounts in the Balance Sheet	26.9		28.1
Financial Instruments	0.0		0.0
Fair Value of Financial Collateral in the Balance Sheet	6.4		8.0
Net Amount	20.5		20.1
Derivative Assets (Liabilities), at Fair Value, Net	26.9
Financial Liabilities
Gross Amounts Recognized	62.7		18.2
Gross Amounts Offset in the Balance Sheet	0.0		0.0
Net Amounts in the Balance Sheet	62.7		18.2
Financial Instruments	0.0		0.0
Fair Value of Financial Collateral in the Balance Sheet	1.0		0.0
Net Amount	61.7		18.2
Repurchase agreements
Gross Amounts Recognized			1,051.1
Gross Amounts Offset in the Balance Sheet			0.0
Net Amounts in the Balance Sheet	1,071.0		1,051.1
Financial Instruments			0.0
Fair Value of Financial Collateral in the Balance Sheet			1,051.1
Net Amount			0.0
Total assets and liabilities
Gross Amounts Recognized	1,133.7		1,069.3
Gross Amounts Offset in the Balance Sheet			0.0
Net Amounts in the Balance Sheet	1,133.7		1,069.3
Financial Instruments	0.0		0.0
Fair Value of Financial Collateral in the Balance Sheet	1,072.0		1,051.1
Net Amount	61.7		18.2
Derivative Liability, Notional Amount	1,983.1		1,103.9
Not Designated as Hedging Instrument
Total assets and liabilities
Amount of net gains recognized in mortgage banking revenues	0.5	$ 0.3
Interest Rate Swap
Financial Assets
Gross Amounts Recognized	25.6		26.3
Gross Amounts Offset in the Balance Sheet	0.0		0.0
Net Amounts in the Balance Sheet	25.6		26.3
Financial Instruments	0.0		0.0
Fair Value of Financial Collateral in the Balance Sheet	6.4		8.0
Net Amount	19.2		18.3
Financial Liabilities
Gross Amounts Recognized	62.3		18.2
Gross Amounts Offset in the Balance Sheet	0.0		0.0
Net Amounts in the Balance Sheet	62.3		18.2
Financial Instruments	0.0		0.0
Fair Value of Financial Collateral in the Balance Sheet	1.0		0.0
Net Amount	61.3		18.2
Interest Rate Swap | Not Designated as Hedging Instrument
Total assets and liabilities
Derivative Liability, Notional Amount	1,827.1		913.9
Mortgage Related Derivatives
Financial Assets
Gross Amounts Recognized	1.3		1.8
Gross Amounts Offset in the Balance Sheet	0.0		0.0
Net Amounts in the Balance Sheet	1.3		1.8
Financial Instruments	0.0		0.0
Fair Value of Financial Collateral in the Balance Sheet	0.0		0.0
Net Amount	1.3		1.8
Risk Participation Agreements
Financial Liabilities
Gross Amounts Recognized	0.4
Gross Amounts Offset in the Balance Sheet	0.0
Net Amounts in the Balance Sheet	0.4
Financial Instruments	0.0
Fair Value of Financial Collateral in the Balance Sheet	0.0
Net Amount	0.4
Risk Participation Agreements | Not Designated as Hedging Instrument
Total assets and liabilities
Derivative Liability, Notional Amount	109.6		$ 0.0
Repurchase Agreements
Financial Liabilities
Gross Amounts Offset in the Balance Sheet	0.0
Repurchase agreements
Gross Amounts Recognized	1,071.0
Net Amounts in the Balance Sheet	1,071.0
Financial Instruments	0.0
Fair Value of Financial Collateral in the Balance Sheet	1,071.0
Net Amount	$ 0.0

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Derivatives and Hedging Activities - Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Derivative [Line Items]
Amount of net fee income recognized in other non-interest income
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	0.0
Derivative Instruments and Hedges, Assets	674.5		$ 695.6
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	(25.5)		(4.4)
Financial Instruments	0.0		0.0
Derivative Asset, Notional Amount	2,715.9		1,691.2
Derivative Asset, Estimated Fair Value	26.9		28.1
Derivative Liability, Notional Amount	1,983.1		1,103.9
Derivative Liabilities, Estimated Fair Value			18.2
Collateral Pledged
Derivative [Line Items]
Derivative, Fair Value, Net	1.3
Financial Instruments	0.3
Not Designated as Hedging Instrument
Derivative [Line Items]
Amount of net fee income recognized in other non-interest income	2.0	$ 1.1
Amount of net gains recognized in mortgage banking revenues	0.5	0.3
Interest Rate Swap
Derivative [Line Items]
Financial Instruments	0.0		0.0
Derivative Asset, Notional Amount	46.4		87.6
Derivative Asset, Estimated Fair Value	0.0		0.1
Interest Rate Swap | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	700.0		700.0
Derivative Asset, Estimated Fair Value	25.3		4.1
Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Notional Amount	1,827.1		913.9
Derivative Asset, Estimated Fair Value	0.3		22.2
Derivative Liability, Notional Amount	1,827.1		913.9
Derivative Liabilities, Estimated Fair Value	62.3		18.1
Risk Participation Agreements
Derivative [Line Items]
Financial Instruments	0.0
Risk Participation Agreements | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Notional Amount	109.6		0.0
Derivative Liabilities, Estimated Fair Value	0.4		0.0
Forward Contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Fair Value, Net	1.3		0.0
Derivative Asset, Notional Amount	81.2		0.0
Derivative Liability, Notional Amount	0.0		102.4
Derivative Liabilities, Estimated Fair Value	0.0		$ 0.0
Cash Flow Hedging [Member] | Interest Rate Swap | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	$ 0.0	$ 0.0

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Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Feb. 01, 2022	Sep. 12, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jun. 11, 2019
Class of Stock [Line Items]
Shares outstanding (in shares)			109,503,010		62,200,456
Common shares issued (in shares)			46,887,104	604
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		5,500,000
Incremental Common Shares Attributable to Dilutive Effect of Accelerated Share Repurchase Agreements		3,000,000
Stock repurchased and retired (in shares)			37,698	127,180
Stock Repurchased and Retired During Period, Value			$ 1.4	$ 5.4
Shares repurchased during the period as percentage of shares authorized for repurchase (percent)				1.30%
Great Western Bank
Class of Stock [Line Items]
Total consideration exchanged	$ 1,723.3
Class A Common Stock
Class of Stock [Line Items]
Shares outstanding (in shares)					41,699,409
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						2,500,000
Stock repurchased and retired (in shares)			0	72,700
Stock Repurchased and Retired During Period, Value				$ 2.9
Shares repurchased, average cost per share (in dollars per share)				$ 39.69
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			1,900,000
Class A Common Stock | Great Western Bank
Class of Stock [Line Items]
Number of shares issued as consideration (in shares)	46,879,601
Class B Common Stock
Class of Stock [Line Items]
Shares outstanding (in shares)					20,501,047
Director [Member]
Class of Stock [Line Items]
Common shares issued (in shares)			7,503	604

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Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, Basic and Diluted [Line Items]
Net (loss) income	$ (33.4)	$ 51.4
Weighted average common shares outstanding for basic earnings per share computation (in shares)	92,855,173	61,591,877
Dilutive effects of stock-based compensation (in shares)	0	122,186
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	92,855,173	61,714,063
Basic earnings per common share (in dollars per share)	$ (0.36)	$ 0.83
Diluted earnings per common share (in dollars per share)	$ (0.36)	$ 0.83
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	55,504	92,602
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	537,374	368,793
Common Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	71,379

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Regulatory Capital (Details) $ in Millions	Jan. 01, 2020 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained Earnings (Accumulated Deficit)		$ 974.5	$ 1,052.6
Total risk-based capital:
Actual, Amount		$ 2,930.9	$ 1,659.3
Actual, Ratio		0.1427	0.1411
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,643.5	$ 940.9
Minimum Required for Capital Adequacy Purposes, Ratio		0.0800	0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 2,157.1	$ 1,235.0
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		10.50%	10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 2,054.4	$ 1,176.2
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.1000	0.1000
Tier 1 risk-based capital:
Actual, Amount		$ 2,446.7	$ 1,469.0
Actual, Ratio		0.1191	0.1249
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,232.6	$ 705.7
Minimum Required for Capital Adequacy Purposes, Ratio		0.0600	0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,746.2	$ 999.7
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		8.50%	8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,643.5	$ 940.9
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0800	0.0800
Common equity tier 1 risk-based capital:
Actual, Amount		$ 2,446.7	$ 1,384.8
Actual, Ratio		11.91%	11.77%
Minimum Required for Capital Adequacy Purposes, Amount		$ 924.5	$ 529.3
Minimum Required for Capital Adequacy Purposes, Ratio		4.50%	4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,438.1	$ 823.3
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		7.00%	7.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,335.3	$ 764.5
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		6.50%	6.50%
Leverage capital ratio:
Actual, Amount		$ 2,446.7	$ 1,469.0
Actual, Ratio		0.0896	0.0768
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum		$ 1,091.7	$ 765.5
Capital Adequacy Purposes and Conservation Buffer, Ratio		0.0400	0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,364.6	$ 956.9
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0500	0.0500
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	$ 24.1
FIB
Total risk-based capital:
Actual, Amount		$ 2,787.3	$ 1,472.5
Actual, Ratio		0.1361	0.1256
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,638.3	$ 938.0
Minimum Required for Capital Adequacy Purposes, Ratio		0.0800	0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 2,150.2	$ 1,231.1
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		10.50%	10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 2,047.9	$ 1,172.5
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.1000	0.1000
Tier 1 risk-based capital:
Actual, Amount		$ 2,560.7	$ 1,382.2
Actual, Ratio		0.1250	0.1179
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,228.7	$ 703.5
Minimum Required for Capital Adequacy Purposes, Ratio		0.0600	0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,740.7	$ 996.6
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		8.50%	8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,638.3	$ 938.0
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0800	0.0800
Common equity tier 1 risk-based capital:
Actual, Amount		$ 2,560.7	$ 1,382.2
Actual, Ratio		12.50%	11.79%
Minimum Required for Capital Adequacy Purposes, Amount		$ 921.5	$ 527.6
Minimum Required for Capital Adequacy Purposes, Ratio		4.50%	4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,433.5	$ 820.8
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		7.00%	7.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,331.1	$ 762.1
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		6.50%	6.50%
Leverage capital ratio:
Actual, Amount		$ 2,560.7	$ 1,382.2
Actual, Ratio		0.0936	0.0724
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum		$ 1,093.8	$ 764.1
Capital Adequacy Purposes and Conservation Buffer, Ratio		0.0400	0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,367.2	$ 955.1
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0500	0.0500

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Commitments and Contingencies (Details) - USD ($) $ in Millions	Apr. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Shares outstanding (in shares)		109,503,010	62,200,456
Entity Common Stock, Shares Outstanding	109,493,618
Class A Common Stock
Loss Contingencies [Line Items]
Shares outstanding (in shares)			41,699,409
Mortgage Loans Held For Sale [Member]
Loss Contingencies [Line Items]
Mortgage loans with recourse provision in effect		$ 0.8
Construction Contracts
Loss Contingencies [Line Items]
Commitments under construction contracts		$ 6.7

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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Entity Information [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 6.2	$ 3.4	$ 3.8	$ 3.7
Provision for (reversal of) credit loss expense	(57.3)	4.8
Credit Extension Commitments	4,899.4		2,539.8
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	819.0		681.6
Standby Letter of Credit
Entity Information [Line Items]
Credit Extension Commitments	100.2		$ 57.5
Cumulative effect, period of adoption, adjusted balance
Entity Information [Line Items]
Provision for (reversal of) credit loss expense	$ 2.4	$ (0.3)

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Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Investment securities available-for sale:
Change in net unrealized gain during period, pre-tax	$ (252.6)	$ (66.8)
Change in net unrealized gain during period, tax expense (benefit)	(62.7)	(17.0)
Change in net unrealized gain during period, net of tax	(189.9)	(49.8)
Reclassification adjustment for net gains included in income, pre-tax	0.1	0.0
Reclassification adjustment for net gains included in income, tax expense (benefit)	0.0	0.0
Reclassification adjustment for net gains included in income, net of tax	0.1	0.0
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, pre-tax	0.2	0.0
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, tax	0.1	0.0
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, pre-tax	0.1	0.0
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, pre-tax	(23.0)	0.0
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit)	(5.7)	0.0
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, net of tax	(17.3)	0.0
Unrealized loss on derivatives, pre-tax	21.3	(0.1)
Unrealized loss on derivatives, tax expense (benefit)	5.3	0.0
Unrealized loss on derivatives, net of tax	16.0	(0.1)
Other comprehensive loss, before tax	(254.0)	(66.9)
Other Comprehensive Income (Loss), tax expense (benefit)	(63.0)	(17.0)
Other Comprehensive Income (Loss), Net of Tax	$ (191.0)	$ (49.9)

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Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	$ 3,441.1	$ 1,933.4	$ 1,986.6	$ 1,959.8
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax		15.0
Net unrealized gain (loss) on derivatives	16.0	(0.1)
Net unrealized loss on investment securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	(218.1)		(29.0)
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax	(2.9)
Net unrealized gain on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain (loss) on derivatives	19.0	3.0
Net accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	$ (202.0)	$ 6.7	$ (11.0)	$ 56.6

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Fair Value Measurements - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	$ 0.0	$ 0.0
Investment debt securities available-for-sale	6,283.8		$ 4,820.5
Derivative assets	26.9		28.1
Derivative liabilities	62.7		18.2
Write downs	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0.0		0.0
Deferred compensation plan assets	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	178.1		30.1
Deferred compensation plan assets	19.7		21.4
Deferred compensation plan liabilities	19.7		21.4
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0.0		0.0
Deferred compensation plan assets	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
U.S. Treasury notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	644.9		684.7
U.S. Treasury notes | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	644.9		684.7
U.S. Treasury notes | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
U.S. Treasury notes | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	292.7		427.5
State, county, and municipal securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
State, county, and municipal securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	292.7		427.5
State, county, and municipal securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Obligations of U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	137.9		346.9
Obligations of U.S. government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Obligations of U.S. government agencies | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	137.9		346.9
Obligations of U.S. government agencies | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	3,645.7		2,018.1
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	3,645.7		2,018.1
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Private mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	274.8		173.4
Private mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Private mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	274.8		173.4
Private mortgage-backed securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	216.9		270.5
Corporate securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Corporate securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	216.9		270.5
Corporate securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Collateral dependent loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	0.0		0.0
Collateral dependent loans | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	0.0		0.0
Collateral dependent loans | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans			11.7
Collateralized Loan Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	1,070.9		899.4
Collateralized Loan Obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Collateralized Loan Obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	1,070.9		899.4
Collateralized Loan Obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	6,283.8		4,820.5
Derivative assets	26.9		28.1
Derivative liabilities	62.7		18.2
Deferred compensation plan assets	19.7		21.4
Deferred compensation plan liabilities	19.7		21.4
Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	178.1		30.1
Deferred compensation plan assets	19.7		21.4
Deferred compensation plan liabilities	19.7		21.4
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	644.9		684.7
Derivative assets	0.0		0.0
Derivative liabilities	0.0		0.0
Deferred compensation plan assets	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	5,638.9		4,135.8
Derivative assets	26.9		28.1
Derivative liabilities	62.7		18.2
Deferred compensation plan assets	19.7		21.4
Deferred compensation plan liabilities	19.7		21.4
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0.0		0.0
Derivative assets	0.0		0.0
Derivative liabilities	0.0		0.0
Deferred compensation plan assets	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Estimated Fair Value | U.S. Treasury notes | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	644.9		684.7
Estimated Fair Value | State, county, and municipal securities | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	292.7		427.5
Estimated Fair Value | Obligations of U.S. government agencies | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	137.9		346.9
Estimated Fair Value | U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	3,645.7		2,018.1
Estimated Fair Value | Private mortgage-backed securities | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	274.8		173.4
Estimated Fair Value | Corporate securities | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	216.9		270.5
Estimated Fair Value | Collateral dependent loans | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	101.1		11.7
Estimated Fair Value | Collateralized Loan Obligations | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	1,070.9		899.4
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	6,283.8		4,820.5
Derivative assets	26.9		28.1
Derivative liabilities	62.7		18.2
Deferred compensation plan assets	19.7		21.4
Deferred compensation plan liabilities	19.7		21.4
Carrying Amount | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	101.1		11.7
Long-lived assets to be disposed of by sale	1.5		1.3
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	25.6		26.3
Derivative liabilities	62.3		18.2
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.0		0.0
Derivative liabilities	0.0		0.0
Interest Rate Swap | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	25.6		26.3
Derivative liabilities	62.3		18.2
Interest Rate Swap | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.0		0.0
Derivative liabilities	0.0		0.0
Interest Rate Swap | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	25.6		26.3
Derivative liabilities	62.3		18.2
Interest Rate Lock Commitments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets			0.0
Interest Rate Lock Commitments | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets			1.8
Interest Rate Lock Commitments | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets			0.0
Interest Rate Lock Commitments | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets			1.8
Forward Contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.0
Forward Contracts | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1.3
Forward Contracts | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.0
Forward Contracts | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1.3
Long-lived assets to be disposed of by sale | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	0.0		0.0
Long-lived assets to be disposed of by sale | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	0.0		0.0
Long-lived assets to be disposed of by sale | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	1.5		1.3
Long-lived assets to be disposed of by sale | Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	$ 1.5		$ 1.3

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Fair Value Measurements - Fair Value Inputs, Quantitative Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Material write downs	$ 0.0
Significant Unobservable Inputs (Level 3) | Carrying Amount | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans	101.1	$ 11.7
Collateral dependent loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans	0.0	0.0
Collateral dependent loans | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans	0.0	0.0
Collateral dependent loans | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans		11.7
Collateral dependent loans | Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans	$ 101.1	11.7
Collateral dependent loans | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0.01
Collateral dependent loans | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0.18
Collateral dependent loans | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	(0.07)
Other real estate owned | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Other real estate owned	$ 0.0	0.0
Other real estate owned | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Other real estate owned	0.0	0.0
Other real estate owned | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Other real estate owned	17.5	2.0
Other real estate owned | Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Other real estate owned	$ 17.5	2.0
Other real estate owned | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0
Other real estate owned | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0
Other real estate owned | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0
Long-lived assets to be disposed of by sale | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Long-lived assets to be disposed of by sale	$ 0.0	0.0
Long-lived assets to be disposed of by sale | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Long-lived assets to be disposed of by sale	0.0	0.0
Long-lived assets to be disposed of by sale | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Long-lived assets to be disposed of by sale	1.5	1.3
Long-lived assets to be disposed of by sale | Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Long-lived assets to be disposed of by sale	$ 1.5	$ 1.3
Long-lived assets to be disposed of by sale | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0
Long-lived assets to be disposed of by sale | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0
Long-lived assets to be disposed of by sale | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Weighted Average | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0

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Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financial assets:
Securities Purchased under Agreements to Resell	$ 102.0	$ 0.0
Investment debt securities available-for-sale	6,283.8	4,820.5
Investment debt securities held-to-maturity	3,029.1	1,667.5
Derivative assets	26.9	28.1
Financial liabilities:
Derivative liabilities	62.7	18.2
Carrying Amount
Financial assets:
Cash and cash equivalents	3,811.3	2,344.8
Securities Purchased under Agreements to Resell	102.0
Investment debt securities available-for-sale	6,283.8	4,820.5
Investment debt securities held-to-maturity	3,218.7	1,687.6
Accrued interest receivable	81.1	47.4
Mortgage servicing rights, net	32.7	28.2
Loans held for sale	178.1	30.1
Net loans held for investment	16,697.8	9,209.4
Derivative assets	26.9	28.1
Deferred compensation plan assets	19.7	21.4
Total financial assets	30,452.1	18,217.5
Financial liabilities:
Total deposits, excluding time deposits	26,489.9	15,303.1
Time deposits	1,598.4	966.5
Securities sold under repurchase agreements	1,071.0	1,051.1
Accrued interest payable	6.0	3.7
Long-term debt	120.4	112.4
Subordinated debentures held by subsidiary trusts	163.1	87.0
Derivative liabilities	62.7	18.2
Deferred compensation plan liabilities	19.7	21.4
Total financial liabilities	29,531.2	17,563.4
Estimated Fair Value
Financial assets:
Cash and cash equivalents	3,811.3	2,344.8
Securities Purchased under Agreements to Resell	102.0
Investment debt securities available-for-sale	6,283.8	4,820.5
Investment debt securities held-to-maturity	3,029.1	1,667.5
Accrued interest receivable	81.1	47.4
Mortgage servicing rights, net	35.8	28.2
Loans held for sale	178.1	30.1
Net loans held for investment	16,676.6	9,254.3
Derivative assets	26.9	28.1
Deferred compensation plan assets	19.7	21.4
Total financial assets	30,244.4	18,242.3
Financial liabilities:
Total deposits, excluding time deposits	26,489.9	15,303.1
Time deposits	1,579.8	963.1
Securities sold under repurchase agreements	1,071.0	1,051.1
Accrued interest payable	6.0	3.7
Long-term debt	122.8	120.7
Subordinated debentures held by subsidiary trusts	162.3	85.5
Derivative liabilities	62.7	18.2
Deferred compensation plan liabilities	19.7	21.4
Total financial liabilities	29,514.2	17,566.8
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	3,811.3	2,344.8
Securities Purchased under Agreements to Resell	0.0
Investment debt securities available-for-sale	644.9	684.7
Investment debt securities held-to-maturity	296.2	0.0
Accrued interest receivable	0.0	0.0
Mortgage servicing rights, net	0.0	0.0
Loans held for sale	0.0	0.0
Net loans held for investment	0.0	0.0
Derivative assets	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Total financial assets	4,752.4	3,029.5
Financial liabilities:
Total deposits, excluding time deposits	26,489.9	15,303.1
Time deposits	0.0	0.0
Securities sold under repurchase agreements	0.0	0.0
Accrued interest payable	0.0	0.0
Long-term debt	0.0	0.0
Subordinated debentures held by subsidiary trusts	0.0	0.0
Derivative liabilities	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Total financial liabilities	26,489.9	15,303.1
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0.0	0.0
Securities Purchased under Agreements to Resell	102.0
Investment debt securities available-for-sale	5,638.9	4,135.8
Investment debt securities held-to-maturity	2,732.9	1,667.5
Accrued interest receivable	81.1	47.4
Mortgage servicing rights, net	35.8	28.2
Loans held for sale	178.1	30.1
Net loans held for investment	16,575.5	9,242.6
Derivative assets	26.9	28.1
Deferred compensation plan assets	19.7	21.4
Total financial assets	25,390.9	15,201.1
Financial liabilities:
Total deposits, excluding time deposits	0.0	0.0
Time deposits	1,579.8	963.1
Securities sold under repurchase agreements	1,071.0	1,051.1
Accrued interest payable	6.0	3.7
Long-term debt	122.8	120.7
Subordinated debentures held by subsidiary trusts	162.3	85.5
Derivative liabilities	62.7	18.2
Deferred compensation plan liabilities	19.7	21.4
Total financial liabilities	3,024.3	2,263.7
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0.0	0.0
Securities Purchased under Agreements to Resell	0.0
Investment debt securities available-for-sale	0.0	0.0
Investment debt securities held-to-maturity	0.0	0.0
Accrued interest receivable	0.0	0.0
Mortgage servicing rights, net	0.0	0.0
Loans held for sale	0.0	0.0
Net loans held for investment	101.1	11.7
Derivative assets	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Total financial assets	101.1	11.7
Financial liabilities:
Total deposits, excluding time deposits	0.0	0.0
Time deposits	0.0	0.0
Securities sold under repurchase agreements	0.0	0.0
Accrued interest payable	0.0	0.0
Long-term debt	0.0	0.0
Subordinated debentures held by subsidiary trusts	0.0	0.0
Derivative liabilities	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Total financial liabilities	$ 0.0	$ 0.0

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Recent Authoritative Accounting Guidance (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ 3,441.1	$ 1,986.6	$ 1,933.4	$ 1,959.8
Off-Balance Sheet, Credit Loss, Liability	6.2	3.8	3.4	3.7
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ 974.5	$ 1,052.6	$ 988.2	$ 962.1

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 27, 2022	Mar. 31, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Financing Receivable, Modifications, Recorded Investment, Non Accrual		$ 8.3	$ 3.9
Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Dividend amount per share (in dollars)	$ 0.41

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Loans Held for Sale - Narrative (Details) - USD ($)		3 Months Ended
	Feb. 01, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Mortgage loans held for sale		$ 178,100,000		$ 30,100,000
Loans held for sale considered a troubled debt restructuring		0
Transfer of loans from held-for-sale to held for investment		19,800,000	$ 0
Allowance for loan losses, charge-off		5,100,000
Agricultural
Debt Securities, Available-for-sale [Line Items]
Mortgage loans held for sale		132,100,000		0
Nonaccrual loans		32,700,000
Transfer of loans to held-for-sale	$ 155,800,000
Transfer of loans from held-for-sale to held for investment		19,800,000
Cost basis after charge-off		14,700,000
Commercial
Debt Securities, Available-for-sale [Line Items]
Mortgage loans held for sale		23,400,000		0
Transfer of loans to held-for-sale	$ 24,000,000
Residential
Debt Securities, Available-for-sale [Line Items]
Mortgage loans held for sale		$ 22,600,000		$ 30,100,000