First Interstate BancSystem (FIBK) 10-Q 4 Aug 23 2023 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2023	Jul. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	001-34653
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-0331430
Entity Address, Address Line One	401 North 31st Street
Entity Address, City or Town	Billings,
Entity Address, State or Province	MT
Entity Address, Postal Zip Code	59101
City Area Code	406
Local Phone Number	255-5311
Title of 12(b) Security	Class A common stock, $0.00001 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
Amendment Flag	false
Entity Central Index Key	0000860413
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding		105,018,309

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 479	$ 349.2
Interest bearing deposits in banks	201.4	521.2
Federal funds sold	0.1	0.1
Total cash and cash equivalents	680.5	870.5
Investment securities:
Available-for-sale, net of allowance for credit losses of $1.4 at June 30, 2023 and $0.0 at December 31, 2022 (amortized cost of $6,448.2 at June 30, 2023 and $7,573.5 at December 31, 2022)	5,857.9	6,946.1
Held-to-maturity, net of allowance for credit losses of $0.7 at June 30, 2023 and $1.9 at December 31, 2022 (estimated fair values of $2,924.7 at June 30, 2023 and $3,052.2 at December 31, 2022)	3,317.7	3,451.8
Total investment securities	9,175.6	10,397.9
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	210.4	198.6
Loans held for sale	76.5	79.9
Loans held for investment, net of deferred fees and costs	18,263.4	18,099.2
Allowance for credit losses	224.6	220.1
Net loans held for investment	18,038.8	17,879.1
Goodwill	1,100.9	1,100.9
Bank Owned Life Insurance	502	497.9
Premises and equipment, net of accumulated depreciation	443.7	444.7
Other intangibles, net of accumulated amortization	89.1	97
Accrued interest receivable	119.1	118.3
Mortgage servicing rights, net of accumulated amortization and impairment reserve	29.8	31.1
Real Estate Acquired Through Foreclosure	14.4	12.7
Deferred tax assets	193.5	210.5
Other assets	302	348.7
Total assets	30,976.3	32,287.8
Deposits:
Non-interest bearing	6,518.2	7,560
Interest bearing	17,061	17,513.6
Total deposits	23,579.2	25,073.6
Securities sold under repurchase agreements	929.9	1,052.9
Accounts payable and accrued expenses	406.5	445.9
Accrued interest payable	45.8	14.5
Long-term debt	120.8	120.8
Other Short-term Borrowings	2,589	2,327
Allowance for credit losses on off-balance sheet credit exposures	20.8	16.2
Subordinated debentures held by subsidiary trusts	163.1	163.1
Total liabilities	27,855.1	29,214
Stockholders’ equity:
Preferred stock, no par value; 100,000 shares authorized; none issued and outstanding	0	0
Common stock and additional paid-in-capital, $0.00001 par value; 150,000,000 shares authorized; 105,020,683 and 104,442,023 shares were issued and outstanding at June 30, 2023 and December 31, 2022	2,481.4	2,478.2
Retained earnings	1,098.8	1,072.7
Accumulated other comprehensive loss, net	(459)	(477.1)
Total stockholders’ equity	3,121.2	3,073.8
Total liabilities and stockholders’ equity	$ 30,976.3	$ 32,287.8
Common Stock, Shares Authorized	150,000,000	150,000,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investment securities:
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 0.7	$ 1.9
Estimated fair value	$ 2,924.7	$ 3,052.2
Stockholders' equity:
Nonvoting, noncumulative preferred stock, shares authorized (in shares)	100,000	100,000
Nonvoting, noncumulative preferred stock, shares issued (in shares)	0	0
Nonvoting, noncumulative preferred stock, shares outstanding (in shares)	0	0
Preferred Stock, Shares Outstanding	0	0
Shares outstanding (in shares)	105,020,683	104,442,023
Common Stock, Shares, Issued	105,020,683	104,442,023
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Par or Stated Value Per Share	$ 0.00001	$ 0.00001
Preferred Stock, No Par Value	$ 0	$ 0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	$ 6,448.2	$ 7,573.5
Estimated Fair Value	5,857.9	6,946.1
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 1.4	$ 0
Class A Common Stock
Stockholders' equity:
Shares outstanding (in shares)		104,442,023
Common Stock, Shares, Issued		104,442,023

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest income:
Interest and fees on loans	$ 241.6	$ 191.7	$ 477.2	$ 343.4
Interest and dividends on investment securities:
Taxable	65.6	48.8	137.3	78.1
Exempt from federal taxes	1.3	1.4	2.7	2.7
Other Interest and Dividend Income	3.4	1.1	6.4	1.5
Interest on deposits in banks	5.4	3.4	9.6	5.1
Total interest income	317.3	246.4	633.2	430.8
Interest expense:
Interest on deposits	53.6	4.3	93.9	7.3
Interest on securities sold under repurchase agreements	1.5	0.3	2.6	0.6
Interest Expense, Other Short-term Borrowings	39.3	0	70.5	0
Interest on long-term debt	1.4	1.4	2.9	3.1
Interest on subordinated debentures held by subsidiary trusts	3.1	1.4	6	2.4
Total interest expense	98.9	7.4	175.9	13.4
Net interest income	218.4	239	457.3	417.4
Provision for (reduction of) credit losses	11.7	(1.7)	26.9	59.6
Net interest income after provision for credit losses	206.7	240.7	430.4	357.8
Non-interest income:
Payment Services Revenues	20.1	19.5	38.8	34.3
Mortgage banking revenues	2.6	5	4.9	13.4
Wealth management revenues	8.8	9.3	17.8	17.4
Service Charges on Deposit Accounts	5.8	6.3	11	14
Non-interest income	2.4	3.6	4.8	7.9
Debt Securities, Available-for-sale, Gain (Loss)	(0.1)	(0.1)	(23.5)	(0.2)
Other income	4.5	6.3	6.7	11.9
Total non-interest income	44.1	49.9	60.5	98.7
Non-interest expense:
Salaries and wages	68.1	74.8	133.7	134.8
Employee benefits	19.3	19.4	42.1	40.6
Outsourced technology services	15.3	12.8	30	24.1
Occupancy, net	11.7	11.2	24.2	21.2
Furniture and equipment	5.6	5.8	11.5	11.2
OREO expense, net of income	0.6	0	0.8	0.1
Professional fees	5.3	5.5	9.8	9.4
FDIC insurance premiums	4.7	2.8	10.4	6.1
Other intangibles amortization	3.9	4.1	7.9	7.7
Other expenses	29.4	28.1	59.3	51.3
Acquisition related expenses	0	45.8	0	111
Noninterest Expense	163.9	210.3	329.7	417.5
Income before income tax	86.9	80.3	161.2	39
Provision for income tax	19.9	16.2	37.9	8.3
Net income	$ 67	$ 64.1	$ 123.3	$ 30.7
Earnings per common share, basic (in dollars per share)	$ 0.65	$ 0.59	$ 1.19	$ 0.30
Earnings per common share, diluted (in dollars per share)	$ 0.65	$ 0.59	$ 1.19	$ 0.30
Weighted average common shares outstanding, basic (in shares)	103,820,649	109,106,891	103,779,386	101,025,926
Weighted average common shares outstanding, diluted (in shares)	103,822,891	109,131,718	103,821,925	101,076,331

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 67	$ 64.1	$ 123.3	$ 30.7
Other comprehensive income (loss), before tax:
Change in net unrealized (losses) gains during the period	(57.5)	(161.6)	20.7	(414.2)
Reclassification adjustment for net losses included in income	0.1	0.1	23.5	0.2
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	0	0	(7.2)	0.2
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax	(0.4)	(0.9)	(0.8)	(23.9)
Change in unrealized (gain) loss on derivatives	(22.1)	(15)	(12.1)	6.3
Other comprehensive (loss) income, before tax	(79.9)	(177.4)	24.1	(431.4)
Deferred tax benefit (expense) related to other comprehensive (loss) income	20	49.6	(6)	112.6
Other comprehensive (loss) income, net of tax	(59.9)	(127.8)	18.1	(318.8)
Comprehensive income (loss), net of tax	$ 7.1	$ (63.7)	$ 141.4	$ (288.1)

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common stock	Retained earnings	Accumulated other comprehensive loss
Equity, beginning balance at Dec. 31, 2021	$ 1,986.6	$ 945	$ 1,052.6	$ (11)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30.7	0	30.7	0
Other comprehensive income (loss), net of tax expense	$ (318.8)	0	0	(318.8)
Stock repurchased and retired (in shares)	1,759,742
Common shares issued (in shares)	46,913,370
Non-vested common shares issued (in shares)	453,439
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	67,292
Stock Issued During Period, Value, Stock Options Exercised	$ 0.1	0.1	0	0
Common stock transactions:
Common shares purchased and retired	(65.9)	(65.9)	0	0
Common shares issued	1,722.5	1,722.5	0	0
Non-vested common shares issued	0	0	0	0
Non-vested common shares forfeited or canceled	0	0	0	0
Stock-based compensation expense	$ 6.2	6.2	0	0
Common dividends (in dollars per share)	$ 0.82
Common cash dividend declared	$ (89.5)	0	(89.5)	0
Equity, ending balance at Jun. 30, 2022	3,271.9	2,607.9	993.8	(329.8)
Equity, beginning balance at Mar. 31, 2022	3,441.1	2,668.6	974.5	(202)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64.1	0	64.1	0
Other comprehensive income (loss), net of tax expense	$ (127.8)	0	0	(127.8)
Stock repurchased and retired (in shares)	1,722,044
Common shares issued (in shares)	26,266
Non-vested common shares issued (in shares)	2,626
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	51,820
Common stock transactions:
Common shares purchased and retired	$ (64.5)	(64.5)	0	0
Common shares issued	0	0	0	0
Non-vested common shares issued	0	0	0	0
Non-vested common shares forfeited or canceled	0	0	0	0
Stock-based compensation expense	$ 3.8	3.8	0	0
Common dividends (in dollars per share)	$ 0.41
Common cash dividend declared	$ (44.8)	0	(44.8)	0
Equity, ending balance at Jun. 30, 2022	3,271.9	2,607.9	993.8	(329.8)
Equity, beginning balance at Dec. 31, 2022	3,073.8	2,478.2	1,072.7	(477.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	123.3	0	123.3	0
Other comprehensive income (loss), net of tax expense	$ 18.1	0	0	18.1
Stock repurchased and retired (in shares)	55,428
Common shares issued (in shares)	54,414
Non-vested common shares issued (in shares)	616,497
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	36,823
Common stock transactions:
Common shares purchased and retired	$ (1.8)	(1.8)	0	0
Common shares issued	0	0	0	0
Non-vested common shares issued	0	0	0	0
Non-vested common shares forfeited or canceled	0	0	0	0
Stock-based compensation expense	$ 5	5	0	0
Common dividends (in dollars per share)	$ 0.94
Common cash dividend declared	$ (97.2)	0	(97.2)	0
Equity, ending balance at Jun. 30, 2023	3,121.2	2,481.4	1,098.8	(459)
Equity, beginning balance at Mar. 31, 2023	3,160.3	2,478.7	1,080.7	(399.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67	0	67	0
Other comprehensive income (loss), net of tax expense	$ (59.9)	0	0	(59.9)
Stock repurchased and retired (in shares)	348
Common shares issued (in shares)	54,414
Non-vested common shares issued (in shares)	605,634
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	21,035
Common stock transactions:
Common shares purchased and retired	$ 0	0	0	0
Common shares issued	0	0	0	0
Non-vested common shares issued	0	0	0	0
Non-vested common shares forfeited or canceled	0	0	0	0
Stock-based compensation expense	$ 2.7	2.7	0	0
Common dividends (in dollars per share)	$ 0.47
Common cash dividend declared	$ (48.9)	0	(48.9)	0
Equity, ending balance at Jun. 30, 2023	$ 3,121.2	$ 2,481.4	$ 1,098.8	$ (459)

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical)	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Statement of Stockholders' Equity [Abstract]
Stock repurchased and retired (in shares)	1,759,742
Common shares issued (in shares)	46,913,370
Non-vested common shares issued (in shares)	453,439
Non-vested common shares forfeited (in shares)	67,292
stock options exercised (in shares)	17,807
Shares tendered (in shares)	4,877
Common dividends (in dollars per share) | $ / shares	$ 0.82

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 123.3	$ 30.7
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Provision for (reduction of) credit losses	26.9	59.6
Gain (Loss) on Disposition of Property Plant Equipment	(0.3)	(1.4)
Depreciation, Depletion and Amortization	27.2	27.5
Accretion (Amortization) of Discounts and Premiums, Investments	0.6	13.5
Debt and Equity Securities, Gain (Loss)	23.5	0.2
Gain (Loss) on Sale of Loans and Leases	(1.6)	(7.6)
Impairment of Real Estate and Other Assets Pending Disposal	0.8	0
Gain (Loss) on Extinguishment of Debt	0	(1.4)
Mortgage Servicing Rights (MSR) Impairment (Recovery)	0	(3.4)
Deferred Income Tax Expense (Benefit)	10.8	(8.8)
Life Insurance, Corporate or Bank Owned, Change in Value	(6.4)	(4.7)
Share-Based Payment Arrangement, Noncash Expense	5	6.2
Payments for Origination of Mortgage Loans Held-for-sale	(173.3)	(241.2)
Proceeds from Sale of Mortgage Loans Held-for-sale	170.2	263.1
Increase (Decrease) in Operating Capital [Abstract]
Increase (Decrease) in Accrued Interest Receivable, Net	(0.8)	(10.1)
Increase (Decrease) in Other Operating Assets	41.9	7.6
Increase (Decrease) in Interest Payable, Net	31.3	(1.8)
Increase (Decrease) in Accounts Payable and Accrued Liabilities	(49.5)	141.3
Net Cash Provided by (Used in) Operating Activities, Total	229.6	269.2
Payments to Acquire Investments [Abstract]
Payments to Acquire Held-to-Maturity Securities	0	(848.2)
Payments to Acquire Debt Securities, Available-for-Sale	0	(2,521.2)
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Proceeds from Sale and Maturity of Held-to-Maturity Securities	114.6	193.4
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	1,119.7	1,057.8
Purchases of Federal Home Loan Bank and Federal Reserve Bank stock	132.8	0
Proceeds from Federal Home Loan Bank and Federal Reserve Bank stock	121	0
Proceeds from Life Insurance Policy	2.3	0
Payments for (Proceeds from) Other Loans and Leases	(176.7)	(39.2)
Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans	0	1.2
Proceeds From The Sale Of Health Savings Accounts	0	1.4
Cash Acquired from Acquisition	0	2,006.9
Payments for (Proceeds from) Productive Assets	(13.2)	(15.5)
Net Cash Provided by (Used in) Investing Activities, Total	1,034.9	(163.4)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Increase (Decrease) in Deposits	(1,494.4)	(1,093.8)
Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase	(123)	8.5
Proceeds from (Repayments of) Other Debt	262	0
Repayments of Other Long-Term Debt	(0.1)	(157.9)
Proceeds from Issuance of Unsecured Debt	0	8
Payments of Stock Issuance Costs	0	(0.8)
Proceeds from Issuance of Common Stock	0	0.1
Payments for Repurchase of Common Stock	(1.8)	(65.9)
Payments of Ordinary Dividends, Common Stock	(97.2)	(89.5)
Net Cash Provided by (Used in) Financing Activities, Total	(1,454.5)	(1,391.3)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(190)	(1,285.5)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	870.5	2,344.8
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Ending Balance	680.5	1,059.3
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid	30.5	13.8
Interest Paid, Excluding Capitalized Interest, Operating Activities	144.6	13.5
Supplemental Cash Flow Elements [Abstract]
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	0	1,723.3
Finance Lease, Right-of-Use Asset, Amortization	2.8	19.9
Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity	23	10.9
Debt Securities, Available-For-Sale, Transfer, Unrealized Gain (Loss)	0	463.6
Transfer of loans to held-for-sale	3.1	0
Transfer of loans from held-for-sale to held for investment	0	19.8
Real Estate Owned, Transfer to Real Estate Owned	2.5	0.1
Gains (Losses) on Sales of Other Real Estate	$ 0	$ (0.1)

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc., and its consolidated subsidiaries, including its wholly-owned subsidiary, First Interstate Bank (“FIB”) (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 June 30, 2023 and December 31, 2022, the results of operations, changes in stockholders’ equity, and cash flows for each of the three and the six month periods ended June 30, 2023 and 2022, in conformity with U.S. generally accepted accounting principles (“GAAP”). The balance sheet information at December 31, 2022 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 June 30, 2023 presentation. These reclassifications did not change previously reported net loss 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, 2022, which includes a description of significant accounting policies. Operating results for the three and the six months ended June 30, 2023 are not necessarily indicative of the results that may be expected for the year ending December 31, 2023. The below detailed discussion updates the accounting policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. Change in Par Value Unless otherwise noted, all capital values, and share and per share amounts, included in the consolidated financial statements have been retroactively adjusted to account for the change in the Company’s common stock par value from no par value per share to $0.00001 per value per share, which change became effective on May 25, 2023 in connection with the re-domestication of the Company from the State of Montana to the State of Delaware. During the second quarter of 2023, the Company transitioned its Current Expected Credit Loss accounting standard (“CECL”), or ASC 326, model. The new model utilizes fewer portfolio loss segments than the old model due to limited observations of data within certain portfolio loss segments under the old model. The new model calculates historical loss rates by averaging quarterly net charge-offs for each loss segment. The loss rates are macroeconomic-conditioned and applied to loan-level expected cash flows based on contractual repayment terms while considering prepayment, utilization, interest rate, and probability of default assumptions. This change did not result in a material impact to the Company’s financial statements. Allowance for Credit Losses - Loans held for investment The allowance for credit losses is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected over the life of the loans. Loans are charged off against the allowance when management confirms that a loan balance is uncollectable. The Company applies recoveries when received and has elected not to forecast recoveries. Management estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix and trends, asset quality, or term as well as for changes in environmental and economic conditions, such as changes in unemployment rates, property values, or other relevant factors. The allowance for credit losses is measured on a collective basis when similar risk characteristics exist. Annualized loss rates are recalculated quarterly, with subsequent recoveries captured in the quarter a loan was charged off, and are averaged across a look back period from 2009 to the current period. Expected future principal and interest cash flows are calculated using contractual repayment terms while considering prepayment, utilization, interest rate, and probability of default assumptions. Macroeconomic models calculate segment-specific multipliers using third party forecast data. The multipliers adjust the annual loss rates to the level expected under the economic conditions over the 2-year forecast period, followed by a 1-year straight-line reversion to the unadjusted historical average loss rates. The unadjusted loss rates then apply for the remaining life of the loan. Estimated losses are totaled and aggregated to the portfolio segment level. The Company segments the loan portfolio into pools based on the following risk characteristics: financial asset type, collateral type, loan structure, credit characteristics, outstanding loan balances, contractual terms and prepayment assumptions, utilization assumptions, industry of borrower and concentrations, and historical or expected credit loss. The Company has identified the following portfolio segments: Real Estate loans. Include commercial real estate loans which are non-farm, non-residential real estate loans generally secured by first liens on income-producing real estate and generally mature in less than 10 years, construction development loans which are primarily to commercial builders for residential lot development and the construction of single-family residences and commercial real estate properties, commercial construction loans which are primarily made to commercial builders for the development of commercial real estate properties, construction and development loans which are generally underwritten pursuant to credit worthiness or pre-qualification for permanent financing. During the construction phase the borrower pays interest only. Construction and development loans generally transition to a permanent real estate loan or otherwise mature in three years or less. Real estate loans also include agricultural real estate loans that generally mature in ten years or less, secured by farmland or ranchland consisting of short, intermediate, and long-term structures to experienced agriculturalists who have demonstrated management capabilities, established production and historical financial performance and consumer home equity and home equity lines of credit (“HELOC”) that are secured by residential property that generally mature in 25 years or less, and residential loans which are loans to finance the purchase or refinance of residential property which are typically secured by first liens or are construction loans to commercial builders or owner occupants for the construction of single-family residences. Residential 1-4 family loans generally mature within 15 years but could mature up to 30 years. Construction loans are generally underwritten pursuant to credit worthiness or pre-qualification for permanent financing. During the construction phase the borrower pays interest only. Residential construction loans generally transition to a permanent residential loan or otherwise mature in two years or less. Consumer loans. Include indirect, direct and advanceline, and credit cards. Indirect are loan contracts advanced for the purchase of automobiles, boats, and other consumer goods from the consumer product dealer networks within the market areas we serve. Indirect dealer loans are generally secured by automobiles, recreational vehicles, boats, and other types of personal property and are made on an installment basis. Consumer indirect line loans generally mature in seven years or less. Consumer direct and advance line loans are originated for a variety of purposes including the purchase of automobiles, boats and other consumer goods, home improvements, medical expenses, vehicle repairs, debt consolidation, and planned expenses in addition to the purchase of automobiles, boats, and other consumer goods. Consumer direct and advance line loans generally mature in seven years or less. Consumer credit card loans are lines of credit offered to clients in our market areas that are generally floating rate loans and include both unsecured and secured lines. Consumer credit card loans generally do not have stated maturities but are reviewed periodically and are unconditionally cancellable. Commercial loans. Include commercial and industrial loans through a mix of variable and fixed rate commercial loans, including loans to finance showroom floor inventories and other loans for commercial purposes that are secured by 1-4 family residential property. These loans are typically made to small and medium-sized manufacturing, wholesale, retail, and service businesses for working capital needs and business expansions. Floor plan loans and commercial purpose loans secured by 1-4 family generally mature in seven years or less. Commercial loans also include secured and unsecured lines of credit, business credit cards, and loans with maturities of five years or less. Outstanding balances on these commercial loans tend to be cyclical in nature. These loans are generally made with business operations as the primary source of repayment, and are typically collateralized by inventory, accounts receivable, equipment, and/or personal guarantees. Agricultural loans. Agricultural loans generally consist of short and medium-term loans and lines of credit that are primarily used for crops, livestock, equipment, and general operations. Agricultural loans are ordinarily secured by assets such as livestock or equipment and are repaid from the operations of the farm or ranch. Agricultural loans generally have maturities of seven years or less, with operating lines for one production season. Contractual Term. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments, defaults, interest rates, and utilization rates. The contractual term excludes expected extensions, renewals, and modifications unless either management has a reasonable expectation at the reporting date that a modification to borrowers experiencing financial difficulty will be executed or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company. A loan for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, is considered to be a modification to borrowers experiencing financial difficulty. The allowance for credit loss on a modification to borrowers experiencing financial difficulty is measured using the same method as all other loans held for investment, except when the loan is individually assessed for credit loss. Allowance for Credit Losses on Off-Balance Sheet Credit Exposures. The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit unless that obligation is unconditionally cancellable by the Company. Management considers our unused credit card lines and federal fund lines, extended to others, to be unconditionally cancellable. The allowance for credit losses on off-balance sheet credit exposures is adjusted as a provision for credit loss expense. The estimate considers the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over the estimated life.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2023
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 (“GWB acquisition”). The acquisition of GWB expanded the Company’s geographical footprint with an enhanced platform for future growth. 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. The acquisition was completed on February 1, 2022. The Company accounted for the 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. The following table provides the 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 as amended for measurement period adjustments. We recorded the estimate of fair value based on valuations 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 goodwill of $479.3 million, of which $31.7 million is 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. All amounts reported were finalized during the fourth quarter of 2022. 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 217.0 Loans held for investment 7,705.0 Allowance for credit losses (59.5) Premises and equipment, including right of use lease assets 144.7 Other real estate owned 15.8 Company-owned life insurance 186.6 Core deposit intangibles 50.1 Customer relationship intangible 22.8 Mortgage servicing rights 1.3 Deferred tax assets, net 60.2 Other assets 200.8 Total assets acquired 13,351.8 Liabilities assumed: Deposits 11,688.0 Securities sold under repurchase agreements 74.0 Accrued expenses and other liabilities 110.4 FHLB advances 122.9 Subordinated debt 36.4 Subordinated debentures held by subsidiary trusts 76.1 Total liabilities assumed 12,107.8 Net assets acquired $ 1,244.0 Consideration paid: Class A common stock 1,723.3 Total consideration paid (1) $ 1,723.3 Goodwill $ 479.3 (1) Includes $13 thousand of cash paid in lieu of fractional shares. For a description of the fair value and unpaid principal balance of loans from the GWB acquisition, as well as the methods used to determine the fair values of significant assets and liabilities, see “Note 2 – Acquisitions” in Part IV, Item 15 “Notes to Consolidated Financial Statements” within our Annual Report on Form 10-K for the year ended December 31, 2022. There were no acquisition related expenses related to the GWB acquisition for the three and the six month periods ended June 30, 2023. There were $45.8 million and $111.0 million of acquisition related expenses related to the GWB acquisition for the three and the six month periods ended June 30, 2022, respectively. During the three months ended March 31, 2022, 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 income for the three and the six months ended June 30, 2023 and 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. GWB was merged with our existing bank subsidiary, FIB, contemporaneously with the closing of the parent company merger. The core system conversion was completed on May 23, 2022. The following table presents certain unaudited pro forma financial information for illustrative purposes only, for the three and the six month periods ended June 30, 2022 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 June 30, Six Months Ended June 30, 2022 2022 Total revenues $ 300.7 $ 569.6 Net income $ 101.1 $ 177.5 Earnings per common share (Basic) $ 0.93 $ 1.76 Earnings per common share (Diluted) $ 0.93 $ 1.76

Goodwill and Core Deposit Intan

Goodwill and Core Deposit Intangibles	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill The Company had goodwill of $1,100.9 million at both June 30, 2023 and December 31, 2022 and performed its annual impairment assessment as of July 1, 2022 concluding that there was no impairment to goodwill. In addition, there were no events or circumstances that occurred during the second half of 2022 that would more-likely-than-not reduce the fair value of the Company’s reporting unit below its carrying value. As a result of recent financial services economic conditions and their impact on our business, including volatility in the stock market and changes to the interest rate environment, we assessed whether a triggering event had occurred as of June 30, 2023 and concluded a triggering event had not occurred as there is no substantial change to the Company’s long-term performance expectations. We will continue to monitor the financial services economic conditions and perform an interim impairment analysis if necessary. 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 June 30, 2023 and December 31, 2022: June 30, 2023 CDI OCRI Total Gross other intangible assets, at January 1, 2023 $ 154.7 $ 22.8 $ 177.5 Accumulated amortization (85.7) (2.7) (88.4) Net other intangible assets, at June 30, 2023 $ 69.0 $ 20.1 $ 89.1 December 31, 2022 Gross other intangible assets, at January 1, 2022 $ 106.0 $ — $ 106.0 Amounts established through acquisition 50.1 22.8 72.9 Reductions due to sale of health savings accounts (1.4) — (1.4) Accumulated amortization (78.8) (1.7) (80.5) Net other intangible assets, at December 31, 2022 $ 75.9 $ 21.1 $ 97.0 The Company recorded $3.9 million and $4.1 million of other intangible asset amortization expense for the three months ended June 30, 2023 and 2022, 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 at June 30, 2023: Years Ending December 31, CDI OCRI Total 2023 remaining $ 6.8 $ 0.9 $ 7.7 2024 12.7 1.9 14.6 2025 11.8 1.9 13.7 2026 10.9 1.9 12.8 2027 8.2 1.9 10.1 Thereafter 18.6 11.6 30.2 Total $ 69.0 $ 20.1 $ 89.1

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Investment Securities	The amortized cost and the approximate fair values of investment securities are summarized as follows: June 30, 2023 Amortized Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Available-for-Sale: U.S. Treasury notes $ 250.1 $ — $ 250.1 $ — $ (31.0) $ 219.1 State, county, and municipal securities 258.1 — 258.1 — (43.2) 214.9 Obligations of U.S. government agencies 186.4 — 186.4 — (14.4) 172.0 U.S. agency commercial mortgage-backed securities 1,212.9 — 1,212.9 0.2 (110.7) 1,102.4 U.S. agency residential mortgage-backed securities 1,534.5 — 1,534.5 — (159.1) 1,375.4 Collateralized mortgage obligations 1,350.8 — 1,350.8 — (145.6) 1,205.2 Private mortgage-backed securities 253.5 — 253.5 — (36.4) 217.1 Collateralized loan obligations 1,141.8 — 1,141.8 — (17.5) 1,124.3 Corporate securities 261.5 (1.4) 260.1 — (32.6) 227.5 Other investments — — — — — Total $ 6,449.6 $ (1.4) $ 6,448.2 $ 0.2 $ (590.5) $ 5,857.9 June 30, 2023 Amortized Cost 1 Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Held-to-Maturity: U.S. Treasury notes $ 397.8 $ — $ 397.8 $ — $ (8.9) $ 388.9 State, county, and municipal securities 180.5 — 180.5 0.2 (27.0) 153.7 Obligations of U.S. government agencies 353.1 — 353.1 — (48.9) 304.2 U.S. agency commercial mortgage-backed securities 517.8 — 517.8 — (61.4) 456.4 U.S. agency residential mortgage-backed securities 1,311.4 — 1,311.4 — (160.7) 1,150.7 Collateralized mortgage obligations 500.7 — 500.7 0.2 (78.7) 422.2 Corporate securities 57.1 (0.7) 56.4 — (7.8) 48.6 Total $ 3,318.4 $ (0.7) $ 3,317.7 $ 0.4 $ (393.4) $ 2,924.7 (1) Amortized cost presented above includes $12.3 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, and $19.2 million of unamortized losses in state, county, and municipal, obligations of U.S. government agencies and collateralized loan obligations related to the 2022 transfer of securities from available-for-sale to held-to-maturity. December 31, 2022 Amortized Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Available-for-Sale: U.S. Treasury notes $ 675.1 $ — $ 675.1 $ 2.1 $ (34.5) $ 642.7 State, county, and municipal securities 314.3 — 314.3 — (50.6) 263.7 Obligations of U.S. government agencies 216.2 — 216.2 — (17.3) 198.9 U.S. agency commercial mortgage-backed securities 1,468.0 — 1,468.0 0.2 (117.0) 1,351.2 U.S. agency residential mortgage-backed securities 1,726.0 — 1,726.0 — (167.7) 1,558.3 Collateralized mortgage obligations 1,491.5 — 1,491.5 — (141.3) 1,350.2 Private mortgage-backed securities 264.9 — 264.9 — (36.9) 228.0 Collateralized loan obligations 1,145.2 — 1,145.2 — (33.6) 1,111.6 Corporate securities 272.3 — 272.3 — (30.8) 241.5 Other investments — — — — — — Total $ 7,573.5 $ — $ 7,573.5 $ 2.3 $ (629.7) $ 6,946.1 December 31, 2022 Amortized Cost 1 Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Held-to-Maturity: U.S. Treasury notes $ 396.6 $ — $ 396.6 $ — $ (10.2) $ 386.4 State, county, and municipal securities 181.2 (0.1) 181.1 0.2 (31.6) 149.7 Obligations of U.S. government agencies 351.7 — 351.7 — (49.6) 302.1 U.S. agency commercial mortgage-backed securities 526.8 — 526.8 — (58.3) 468.5 U.S. agency residential mortgage-backed securities 1,391.5 — 1,391.5 — (166.6) 1,224.9 Collateralized mortgage obligations 525.8 — 525.8 0.2 (76.7) 449.3 Corporate securities 80.1 (1.8) 78.3 — (7.0) 71.3 Other investments — — — — — — Total $ 3,453.7 $ (1.9) $ 3,451.8 $ 0.4 $ (400.0) $ 3,052.2 (1) Amortized cost presented above includes $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. The following tables show the gross unrealized losses and fair values of available-for-sale investment securities and the length of time individual investment securities have been in an unrealized loss position as of June 30, 2023 and December 31, 2022. Less than 12 Months 12 Months or More Total June 30, 2023 Fair Gross Fair Gross Fair Gross Available-for-Sale: U.S. Treasury notes $ 47.2 $ (2.3) $ 171.9 $ (28.7) $ 219.1 $ (31.0) State, county, and municipal securities 9.0 (0.4) 204.0 (42.8) 213.0 (43.2) Obligations of U.S. government agencies 60.6 (3.1) 111.0 (11.3) 171.6 (14.4) U.S. agency commercial mortgage-backed securities 396.0 (23.7) 696.8 (87.0) 1,092.8 (110.7) U.S. agency residential mortgage-backed securities 272.5 (15.7) 1,102.8 (143.4) 1,375.3 (159.1) Collateralized mortgage obligations 312.6 (20.9) 892.6 (124.7) 1,205.2 (145.6) Private mortgage-backed securities — — 217.1 (36.4) 217.1 (36.4) Collateralized loan obligations — — 1,124.3 (17.5) 1,124.3 (17.5) Corporate securities 16.3 (0.9) 211.2 (31.7) 227.5 (32.6) Other securities — — — — — — Total $ 1,114.2 $ (67.0) $ 4,731.7 $ (523.5) $ 5,845.9 $ (590.5) Less than 12 Months 12 Months or More Total December 31, 2022 Fair Gross Fair Gross Fair Gross Available-for-Sale: U.S. Treasury notes $ 168.8 $ (4.7) $ 170.4 $ (29.8) $ 339.2 $ (34.5) State, county, and municipal securities 104.9 (9.0) 146.1 (41.6) 251.0 (50.6) Obligations of U.S. government agencies 152.2 (10.1) 46.1 (7.2) 198.3 (17.3) U.S. agency commercial mortgage-backed securities 1,069.8 (59.9) 270.8 (57.0) 1,340.6 (116.9) U.S. agency residential mortgage-backed securities 1,213.5 (112.3) 344.6 (55.4) 1,558.1 (167.7) Collateralized mortgage obligations 1,016.4 (90.1) 333.0 (51.3) 1,349.4 (141.4) Private mortgage-backed securities 133.1 (19.1) 94.9 (17.8) 228.0 (36.9) Collateralized loan obligations 1,082.6 (33.1) 28.9 (0.5) 1,111.5 (33.6) Corporate securities 130.6 (8.3) 110.8 (22.5) 241.4 (30.8) Total $ 5,071.9 $ (346.6) $ 1,545.6 $ (283.1) $ 6,617.5 $ (629.7) As of June 30, 2023 and December 31, 2022, 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. 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 management expects to 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 primarily 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. As of June 30, 2023 and December 31, 2022, the Company had 1,030 and 1,222 individual investment securities, respectively, that were in an unrealized loss position, which was related primarily to fluctuations in current interest rates. As of June 30, 2023, 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 available-for-sale investment securities: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 2.6 $ — $ — $ — (Reversal of) provision for credit losses (1.2) — 1.4 — Ending balance $ 1.4 $ — $ 1.4 $ — The following table presents the activity in the allowance for credit losses related to held-to-maturity investment securities: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 0.7 $ 1.6 $ 1.9 $ — (Reversal of) provision for credit loss losses — — (1.2) 1.6 Ending balance $ 0.7 $ 1.6 $ 0.7 $ 1.6 The Company had a $1.4 million and no allowance for credit losses for available-for-sale corporate investment securities as of June 30, 2023 and December 31, 2022, respectively. The Company had a $0.7 million and a $1.9 million allowance for credit losses for held-to-maturity corporate and state, county, and municipal investment securities as of June 30, 2023 and December 31, 2022, respectively. On a quarterly basis, the Company refreshes the credit quality indicator 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: June 30, 2023 AAA AA A BBB BB Not Rated Total U.S. Treasury notes $ 397.8 $ — $ — $ — $ — $ — $ 397.8 State, county, and municipal securities 69.1 92.6 10.6 — — 8.2 180.5 Obligations of U.S. government agencies 353.1 — — — — — 353.1 U.S. agency commercial mortgage-backed securities FNMA/FHLMC 361.9 — — — — — 361.9 GNMA 155.9 — — — — — 155.9 U.S. agency residential mortgage-backed securities FNMA/FHLMC 1,265.8 — — — — — 1,265.8 GNMA 45.6 — — — — — 45.6 Collateralized mortgage obligations FNMA/FHLMC 352.2 — — — — — 352.2 GNMA 148.5 — — — — — 148.5 Corporate securities — — — 52.1 — 5.0 57.1 Total $ 3,149.9 $ 92.6 $ 10.6 $ 52.1 $ — $ 13.2 $ 3,318.4 December 31, 2022 AAA AA A BBB BB Not Rated Total U.S. Treasury notes $ 396.6 $ — $ — $ — $ — $ — $ 396.6 State, county, and municipal securities 68.3 92.8 11.5 — — 8.6 181.2 Obligations of U.S. government agencies 351.7 — — — — — 351.7 U.S. agency commercial mortgage-backed securities FNMA/FHLMC 364.9 — — — — — 364.9 GNMA 161.9 — — — — — 161.9 U.S. agency residential mortgage-backed securities FNMA/FHLMC 1,342.9 — — — — — 1,342.9 GNMA 48.6 — — — — — 48.6 Collateralized mortgage obligations FNMA/FHLMC 525.8 — — — — — 525.8 Corporate securities — — — 65.1 10.0 5.0 80.1 Other securities — — — — — — — Total $ 3,260.7 $ 92.8 $ 11.5 $ 65.1 $ 10.0 $ 13.6 $ 3,453.7 As of June 30, 2023 and December 31, 2022, the Company had $38.1 million and $38.9 million, respectively, of accrued interest receivable from investment securities on the consolidated balance sheets. Accrued interest receivable is presented as a separate line item on the consolidated balance sheets and the Company does not include accrued interest receivable in the carrying amount of financial assets held at the amortized cost basis or in the related allowance for credit losses calculation. As of June 30, 2023 and December 31, 2022, 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 June 30, 2023 and December 31, 2022, 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 during the three months ended June 30, 2023. During the six months ended June 30, 2023, there were no material gross realized gains and $23.5 million in gross realized losses on the disposition of available-for-sale investment securities, as a result of the sale of $853.0 million in carrying value of investment securities. For the three and the six month periods ended June 30, 2022, there were no material gross realized gains and no material gross realized losses on the disposition of available-for-sale investment securities. Maturities of securities do not reflect rate repricing opportunities present in adjustable-rate mortgage-backed securities. 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 June 30, 2023 Amortized Estimated Amortized Estimated Within one year $ 0.5 $ 0.5 $ 308.1 $ 301.7 After one year but within five years 814.4 761.3 346.6 322.9 After five years but within ten years 1,655.7 1,472.1 654.3 567.9 After ten years 3,979.0 3,624.0 2,009.4 1,732.2 Total $ 6,449.6 $ 5,857.9 $ 3,318.4 $ 2,924.7 As of June 30, 2023, the Company held investment securities callable within one year having amortized costs and estimated fair values of $1,593.8 million and $1,521.2 million, respectively. These investment securities are primarily included in the “after ten years” category in the table above. As of June 30, 2023, the Company had no callable structured notes. As of June 30, 2023 and December 31, 2022, the Company has amortized costs of $7,227.8 million and $4,998.9 million, respectively, for investment securities pledged to secure public deposits and securities sold under repurchase agreements that had estimated fair values of $6,455.1 million and $4,432.0 million, as of June 30, 2023 and December 31, 2022, 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. As of June 30, 2023 and December 31, 2022, the Company held $210.4 million and $198.6 million, respectively, in equity securities in a combination of Federal Reserve Bank and Federal Home Loan Bank stocks, which are restricted nonmarketable securities acquired to meet regulatory requirements. These securities are carried at cost.

Loans Held for Sale

Loans Held for Sale	6 Months Ended
	Jun. 30, 2023
Loans Held for Sale [Abstract]
Loans Held for Sale	The following table presents loans held for sale by portfolio segment for the dates indicated: June 30, December 31, Loans held for sale: Agricultural 1 $ 59.1 $ 62.5 Commercial construction, at lower of cost or market 6.4 10.5 Residential mortgage, at fair value 11.0 6.9 Total loans held for sale $ 76.5 $ 79.9 1 The Company holds $51.7 million of agricultural loans at lower of cost or market and $7.4 million of agricultural loans on accrual status at fair value with an unpaid principal balance of $7.4 million, of which $5.6 million is 90 days or more past due. The table below presents the non-residential mortgage loans held for sale activity for the 2023 period: Agricultural Commercial Construction Land Acquisition and Development Beginning balance $ 62.5 $ 10.5 $ — Loans held for investment transferred to loans held for sale — — 3.1 Repayments and discounted pay-offs (5.6) — (3.1) Increase (decrease) in estimated fair value of the loans 1 2.2 (4.1) — Ending balance $ 59.1 $ 6.4 $ — 1 For the six months ended June 30, 2023, the Company recorded a gain of $2.2 million and a loss of $4.1 million in other income within the consolidated statements of income related to fair value changes. As of June 30, 2023, loans held for sale included nonaccrual loans of $33.2 million, of which $26.8 million were agricultural loans and $6.4 million was a commercial construction loan. As of December 31, 2022, loans held for sale included nonaccrual loans of $39.8 million, of which $29.3 million were agricultural loans and $10.5 million was a commercial construction loan.

Loans Held for Investment

Loans Held for Investment	6 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Loans	Loans Held for Investment The following table presents loans by class of receivable and portfolio segment as of the dates indicated: June 30, December 31, Real estate: Commercial $ 8,813.9 $ 8,528.6 Construction 1,836.5 1,944.4 Residential 2,198.3 2,188.3 Agricultural 755.7 794.9 Total real estate 13,604.4 13,456.2 Consumer: Indirect 764.1 829.7 Direct and advance lines 144.0 152.9 Credit card 72.1 75.9 Total consumer 980.2 1,058.5 Commercial 3,002.7 2,882.6 Agricultural 688.0 708.3 Other, including overdrafts 1.7 9.2 Loans held for investment 18,277.0 18,114.8 Deferred loan fees and costs (13.6) (15.6) Loans held for investment, net of deferred fees and costs 18,263.4 18,099.2 Allowance for credit losses (224.6) (220.1) Net loans held for investment $ 18,038.8 $ 17,879.1 Allowance for Credit Losses The following tables represent, by loan portfolio segments, the activity in the allowance for credit losses for loans held for investment: Three Months Ended June 30, 2023 Beginning Balance Provision for (reversal of) Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate $ 147.5 $ 20.4 $ (10.0) $ 0.8 $ 158.7 Consumer 21.8 (6.2) (3.3) 1.4 13.7 Commercial 54.4 (4.5) (0.8) 0.4 49.5 Agricultural 2.4 0.2 — 0.1 2.7 Total allowance for credit losses $ 226.1 $ 9.9 $ (14.1) $ 2.7 $ 224.6 Six Months Ended June 30, 2023 Beginning Balance Provision for Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate $ 138.7 $ 33.8 $ (14.8) $ 1.0 $ 158.7 Consumer 23.3 (5.5) (6.7) 2.6 13.7 Commercial 54.9 (5.3) (1.5) 1.4 49.5 Agricultural 3.2 (0.9) — 0.4 2.7 Total allowance for credit losses $ 220.1 $ 22.1 $ (23.0) $ 5.4 $ 224.6 Three Months Ended June 30, 2022 Beginning Balance ACL for (reduction on) PCD Loans Provision for (reversal of) Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate: Commercial real estate: Non-owner occupied $ 45.2 $ (6.9) $ (8.8) $ — $ — $ 29.5 Owner occupied 25.2 — 1.4 — — 26.6 Multi-family 54.6 (19.0) (2.9) — 0.7 33.4 Total commercial real estate 125.0 (25.9) (10.3) — 0.7 89.5 Construction: Land acquisition & development 0.5 — 0.2 — 0.1 0.8 Residential construction 3.3 — 0.1 — — 3.4 Commercial construction 10.2 — 4.7 — — 14.9 Total construction 14.0 — 5.0 — 0.1 19.1 Residential real estate: Residential 1-4 family 18.7 — (0.7) — 0.2 18.2 Home equity and HELOC 1.4 — (0.1) — 0.2 1.5 Total residential real estate 20.1 — (0.8) — 0.4 19.7 Agricultural real estate 10.5 — (5.1) (0.1) 0.1 5.4 Total real estate 169.6 (25.9) (11.2) (0.1) 1.3 133.7 Consumer: Indirect 13.5 — (0.4) (0.8) 0.8 13.1 Direct and advance lines 4.6 — 0.5 (0.6) 0.5 5.0 Credit card 2.3 — 0.7 (0.9) 0.1 2.2 Total consumer 20.4 — 0.8 (2.3) 1.4 20.3 Commercial: Commercial and floor plans 52.9 — 1.9 (1.1) 0.4 54.1 Commercial purpose secured by 1-4 family 5.0 — 0.4 — 0.1 5.5 Credit card 0.3 — 0.1 (0.1) — 0.3 Total commercial 58.2 — 2.4 (1.2) 0.5 59.9 Agricultural: Agricultural (1.0) 1.1 6.3 (0.1) 0.2 6.5 Total agricultural (1.0) 1.1 6.3 (0.1) 0.2 6.5 Total allowance for credit losses $ 247.2 $ (24.8) $ (1.7) $ (3.7) $ 3.4 $ 220.4 Six Months Ended June 30, 2022 Beginning Balance ACL for PCD Loans Provision for Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate: Commercial real estate: Non-owner occupied $ 17.3 $ 17.2 $ (2.1) $ (2.9) $ — $ 29.5 Owner occupied 13.3 9.5 6.0 (2.2) — 26.6 Multi-family 13.3 10.9 8.5 — 0.7 33.4 Total commercial real estate 43.9 37.6 12.4 (5.1) 0.7 89.5 Construction: Land acquisition & development 0.5 3.4 (0.6) (2.7) 0.2 0.8 Residential construction 2.4 — 1.0 — — 3.4 Commercial construction 6.0 0.2 8.7 — — 14.9 Total construction 8.9 3.6 9.1 (2.7) 0.2 19.1 Residential real estate: Residential 1-4 family 13.4 0.1 4.5 (0.1) 0.3 18.2 Home equity and HELOC 1.2 — — — 0.3 1.5 Total residential real estate 14.6 0.1 4.5 (0.1) 0.6 19.7 Agricultural real estate 1.9 2.3 1.3 (0.2) 0.1 5.4 Total real estate 69.3 43.6 27.3 (8.1) 1.6 133.7 Consumer: Indirect 14.3 — (0.7) (1.7) 1.2 13.1 Direct and advance lines 4.6 — 0.4 (1.4) 1.4 5.0 Credit card 2.2 — 1.3 (1.5) 0.2 2.2 Total consumer 21.1 — 1.0 (4.6) 2.8 20.3 Commercial: Commercial and floor plans 27.1 11.2 20.3 (5.3) 0.8 54.1 Commercial purpose secured by 1-4 family 4.4 0.2 0.8 — 0.1 5.5 Credit card 0.1 — 0.4 (0.2) — 0.3 Commercial 31.6 11.4 21.5 (5.5) 0.9 59.9 Agricultural: Agricultural 0.3 4.5 5.8 (5.4) 1.3 6.5 Total agricultural 0.3 4.5 5.8 (5.4) 1.3 6.5 Total allowance for credit losses $ 122.3 $ 59.5 $ 55.6 $ (23.6) $ 6.6 $ 220.4 (1) Amounts presented exclude the allowance for credit losses related to unfunded commitments and investment securities. The allowance for credit losses related to unfunded commitments and investment securities are included in the “Financial Instruments with Off-Balance Sheet Risk” Note and “Investment Securities” Note, respectively. (2) 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. Collateral-Dependent Financial Loans A collateral-dependent financial loan relies substantially on the operation or sale of the collateral securing the loan for repayment. A loan may become collateral-dependent when foreclosure is probable or 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 principal balance of collateral-dependent loans by class of receivable as of the dates indicated: Collateral Type As of June 30, 2023 Business Assets Real Property Total Real estate: Commercial $ 1.6 $ 32.3 $ 33.9 Construction — 17.8 17.8 Residential — 0.5 0.5 Agricultural — 3.7 3.7 Total real estate 1.6 54.3 55.9 Commercial 1.4 5.5 6.9 Agricultural 0.2 0.5 0.7 Total collateral-dependent loans $ 3.2 $ 60.3 $ 63.5 Collateral Type As of December 31, 2022 Business Assets Real Property Total Real estate: Commercial $ 1.7 $ 15.8 $ 17.5 Construction — 3.2 3.2 Residential — 0.5 0.5 Agricultural 0.2 5.8 6.0 Total real estate 1.9 25.3 27.2 Commercial 3.1 1.5 4.6 Agricultural 2.1 5.2 7.3 Total collateral-dependent loans $ 7.1 $ 32.0 $ 39.1 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 90 days or more past due continue to accrue interest. The following tables present the contractual aging of the Company’s recorded principal balance of loans by class of receivable as of the dates indicated: Total Loans 30 - 59 60 - 89 90 or more 30 or More Days Days Days Days Current Non-accrual Total As of June 30, 2023 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate: Commercial $ 4.1 $ 0.1 $ — $ 4.2 $ 8,774.3 $ 35.4 $ 8,813.9 Construction 8.2 3.0 3.3 14.5 1,803.8 18.2 1,836.5 Residential 1.2 2.1 0.6 3.9 2,186.7 7.7 2,198.3 Agricultural 7.8 3.9 0.3 12.0 736.9 6.8 755.7 Total real estate 21.3 9.1 4.2 34.6 13,501.7 68.1 13,604.4 Consumer: Indirect 6.5 2.1 0.5 9.1 752.1 2.9 764.1 Direct 0.6 0.5 0.1 1.2 142.6 0.2 144.0 Credit card 0.7 0.4 0.4 1.5 70.6 — 72.1 Total consumer 7.8 3.0 1.0 11.8 965.3 3.1 980.2 Commercial 4.6 2.3 1.1 8.0 2,982.6 12.1 3,002.7 Agricultural 1.3 0.1 0.4 1.8 683.4 2.8 688.0 Other, including overdrafts — — — — 1.7 — 1.7 Loans held for investment $ 35.0 $ 14.5 $ 6.7 $ 56.2 $ 18,134.7 $ 86.1 $ 18,277.0 Total Loans 30 - 59 60 - 89 90 or more 30 or More Days Days Days Days Current Non-accrual Total As of December 31, 2022 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate: Commercial $ 5.6 $ 0.8 $ 1.1 $ 7.5 $ 8,501.5 $ 19.6 $ 8,528.6 Construction 10.4 0.6 0.6 11.6 1,929.1 3.7 1,944.4 Residential 9.9 2.1 1.2 13.2 2,168.7 6.4 2,188.3 Agricultural 1.1 6.1 — 7.2 780.1 7.6 794.9 Total real estate 27.0 9.6 2.9 39.5 13,379.4 37.3 13,456.2 Consumer: Indirect 9.3 2.4 0.6 12.3 814.7 2.7 829.7 Direct 0.8 0.3 0.1 1.2 151.4 0.3 152.9 Credit card 0.8 0.4 0.6 1.8 74.1 — 75.9 Total consumer 10.9 3.1 1.3 15.3 1,040.2 3.0 1,058.5 Commercial 7.1 1.7 2.1 10.9 2,861.5 10.2 2,882.6 Agricultural 0.8 2.2 0.1 3.1 696.5 8.7 708.3 Other, including overdrafts — — — — 9.2 — 9.2 Loans held for investment $ 45.8 $ 16.6 $ 6.4 $ 68.8 $ 17,986.8 $ 59.2 $ 18,114.8 (1) As of June 30, 2023 and December 31, 2022, none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three and the six months ended June 30, 2023 and 2022, respectively. There were no material reversals of accrued interest during the same periods. Modifications to Borrowers Experiencing Financial Difficulty Modifications of 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. Effective January 1, 2023, the Company adopted ASU 2022-02, which eliminated accounting guidance for troubled debt restructurings while requiring disclosures of borrowers experiencing financial difficulty for modifications related to principal reductions, interest rate reductions, term extensions, and more than insignificant payment delay. See “Note 17 – Recent Authoritative Accounting Guidance” of these Notes to Unaudited Consolidated Financial Statements” for further discussion of the amendments in this update. From time to time, we may modify certain loans to borrowers who are experiencing financial difficulty. In some cases, these modifications may result in new loans. Loan modifications to borrowers experiencing financial difficulty may be in the form of principal forgiveness, an interest rate reduction, an other-than-insignificant payment delay, or a term extension or a combination thereof, among other things. The following table presents the amortized cost basis of loans at June 30, 2023 that were both experiencing financial difficulty and modified during the three and the six month periods ended June 30, 2023, by class and by type of modification. The percentage of the principal balance of loans that were modified to borrowers in financial distress as compared to the principal balance of each class of receivable is also presented below: Three Months Ended June 30, 2023 Principal Forgiveness Term Extension Total % of Total Class of Loans Held for Investment (1) Real estate: Commercial $ — $ 13.9 $ 13.9 0.16 % Residential — 0.1 0.1 — Total real estate — 14.0 14.0 0.10 Commercial — 6.4 6.4 0.21 Agricultural — 19.6 19.6 2.85 Loans held for investment (2) $ — $ 40.0 $ 40.0 0.22 % Six Months Ended June 30, 2023 Real estate: Commercial $ 1.6 $ 17.4 $ 19.0 0.22 % Construction — 0.1 0.1 0.01 Residential 0.1 0.2 0.3 0.01 Agricultural — 1.1 1.1 0.15 Total real estate 1.7 18.8 20.5 0.15 Commercial — 8.8 8.8 0.29 Agricultural — 36.6 36.6 5.32 Loans held for investment (2) $ 1.7 $ 64.2 $ 65.9 0.36 % (1) Based on the principal balance as of period end, divided by the period end principal balance of the corresponding class of receivables. (2) As of June 30, 2023, the Company excluded $0.9 million in accrued interest from the amortized cost of the identified loans. The Company monitors the performance of loan modifications to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. Of the loans that were modified during the six months ended June 30, 2023, there were $0.2 million of loans classified as past due 30 days or more, with the remaining loans performing in accordance with the modified terms and are classified as current at June 30, 2023. There were no commitments to lend additional funds to borrowers experiencing financial difficulty whose terms have been modified during the three and the six month periods ended June 30, 2023 through either principal forgiveness, interest rate reduction, term extension, or other than insignificant payment delay. The following table presents the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty during the three and the six month periods ended June 30, 2023: Three Months Ended June 30, 2023 Principal Forgiveness Weighted-Average Months of Term Extension Real estate: Commercial $ — 6.4 Residential — 16.2 Total real estate — Consumer: Indirect — 7.0 Direct and advance lines — 8.0 Total consumer — Commercial — 8.3 Agricultural — 8.9 Loans held for investment (1) $ — Six Months Ended June 30, 2023 Real estate: Commercial $ 1.3 6.4 Construction — 12.4 Residential 0.3 19.5 Agricultural — 7.2 Total real estate 1.6 Consumer: Indirect — 8.3 Direct and advance lines — 8.0 Total consumer — Commercial — 9.0 Agricultural — 9.2 Loans held for investment (1) $ 1.6 (1) Balances based on loan original contractual terms. There were no payment defaults on these loans subsequent to their modifications during the three and the six month periods ended June 30, 2023. The Company considers a payment default to occur when the loan is 90 days or more past due or the loan is placed on non-accrual status after the modification. The Company monitors the performance of modified loans on an ongoing basis. In the event of subsequent default, the allowance for credit losses continues to be reassessed on the basis of an individual evaluation of each loan. The modifications made during the periods presented did not significantly impact the Company’s determination of the allowance for credit losses. 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 February 1, 2022, or the date of the acquisition, with the purchase price (or initial fair value of the loans) as amended for measurement period adjustments: Purchase price (initial fair value) $ 623.3 Allowance for credit losses (1) 298.2 Discount attributable to other factors (2) 57.7 Par value (unpaid principal balance) $ 979.2 (1) For acquired PCD loans, an allowance of $298.2 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 $59.5 million. (2) Non-credit discount includes the difference between the amortized cost basis and the unpaid principal balance of $39.6 million established on PCD loans acquired from GWB 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 monitored 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 losses of the following class of receivables based on the aforementioned risk scale as of and for the periods ended: As of and for the six months ended June 30, 2023 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted To Term Total Commercial real estate: Pass $ 633.8 $ 2,250.0 $ 1,728.7 $ 1,302.0 $ 752.4 $ 1,784.9 $ 32.0 $ 55.0 $ 8,538.8 Special mention 4.0 9.3 20.1 5.8 25.5 69.1 1.8 — 135.6 Substandard 3.0 26.5 28.4 9.6 29.2 30.1 0.4 0.3 127.5 Doubtful 10.6 — 1.4 — — — — — 12.0 Total $ 651.4 $ 2,285.8 $ 1,778.6 $ 1,317.4 $ 807.1 $ 1,884.1 $ 34.2 $ 55.3 $ 8,813.9 Current-period gross charge-offs — 0.3 1.7 2.6 — — — — 4.6 Construction real estate: Pass $ 237.6 $ 822.7 $ 502.2 $ 49.6 $ 17.8 $ 40.0 $ 96.2 $ 13.6 $ 1,779.7 Special mention — 8.6 0.1 — 2.7 0.2 — 3.0 14.6 Substandard — 3.0 24.5 0.2 0.1 0.5 — — 28.3 Doubtful — 13.9 — — — — — — 13.9 Total $ 237.6 $ 848.2 $ 526.8 $ 49.8 $ 20.6 $ 40.7 $ 96.2 $ 16.6 $ 1,836.5 Current-period gross charge-offs — — 0.1 — — — — 9.6 9.7 Agricultural real estate: Pass $ 35.9 $ 143.1 $ 163.0 $ 102.9 $ 60.7 $ 143.3 $ 28.8 $ 0.4 $ 678.1 Special mention 2.6 0.8 1.2 2.0 1.7 12.6 8.9 — 29.8 Substandard 8.0 20.7 4.8 1.2 0.5 11.6 — — 46.8 Doubtful — — — 1.0 — — — — 1.0 Total $ 46.5 $ 164.6 $ 169.0 $ 107.1 $ 62.9 $ 167.5 $ 37.7 $ 0.4 $ 755.7 Current-period gross charge-offs — — — — — — — — — Commercial: Pass $ 289.2 $ 577.9 $ 422.6 $ 247.1 $ 127.0 $ 344.7 $ 811.6 $ 36.1 $ 2,856.2 Special mention 0.9 4.2 10.5 4.2 2.3 1.5 11.0 0.1 34.7 Substandard 4.0 21.9 8.4 3.1 4.7 5.9 58.3 — 106.3 Doubtful 4.2 — 1.2 — — — 0.1 — 5.5 Total $ 298.3 $ 604.0 $ 442.7 $ 254.4 $ 134.0 $ 352.1 $ 881.0 $ 36.2 $ 3,002.7 Current-period gross charge-offs — 0.3 0.1 0.2 0.1 — 0.8 — 1.5 Agricultural: Pass $ 50.9 $ 92.8 $ 48.3 $ 26.3 $ 8.3 $ 10.8 $ 375.9 $ 1.4 $ 614.7 Special mention 0.8 1.0 0.7 0.3 0.2 0.2 2.9 0.2 6.3 Substandard 44.5 1.1 1.0 1.4 0.5 1.3 16.6 0.2 66.6 Doubtful — — 0.4 — — — — — 0.4 Total $ 96.2 $ 94.9 $ 50.4 $ 28.0 $ 9.0 $ 12.3 $ 395.4 $ 1.8 $ 688.0 Current-period gross charge-offs — — — — — — — — — December 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 $ 1,162.6 $ 861.3 $ 661.1 $ 467.6 $ 241.5 $ 890.4 $ 29.2 $ 4,313.7 Special mention 1.0 6.8 2.3 4.6 — 7.4 — 22.1 Substandard 0.1 13.9 10.8 18.2 19.6 9.8 — 72.4 Total $ 1,163.7 $ 882.0 $ 674.2 $ 490.4 $ 261.1 $ 907.6 $ 29.2 $ 4,408.2 Commercial real estate owner occupied: Pass $ 793.0 $ 718.7 $ 533.9 $ 266.3 $ 165.8 $ 551.3 $ 18.2 $ 3,047.2 Special mention 10.9 14.2 12.3 6.1 5.6 5.5 1.1 55.7 Substandard 8.4 3.0 2.3 8.9 8.5 17.2 0.5 48.8 Doubtful 0.4 1.4 — — — — — 1.8 Total $ 812.7 $ 737.3 $ 548.5 $ 281.3 $ 179.9 $ 574.0 $ 19.8 $ 3,153.5 Commercial multi-family: Pass $ 369.2 $ 204.9 $ 189.0 $ 52.1 $ 35.0 $ 113.7 $ 1.0 $ 964.9 Special mention — — — — — 1.7 — 1.7 Substandard — — — — — 0.3 — 0.3 Total $ 369.2 $ 204.9 $ 189.0 $ 52.1 $ 35.0 $ 115.7 $ 1.0 $ 966.9 Land, acquisition and development: Pass $ 152.5 $ 114.4 $ 29.5 $ 17.0 $ 10.9 $ 28.4 $ 22.2 $ 374.9 Special mention 6.7 — — — 0.2 0.3 — 7.2 Substandard — 0.3 0.2 — — 0.4 — 0.9 Doubtful — 3.2 — — — — — 3.2 Total $ 159.2 $ 117.9 $ 29.7 $ 17.0 $ 11.1 $ 29.1 $ 22.2 $ 386.2 Residential construction: Pass $ 118.4 $ 119.9 $ 0.4 $ 0.3 $ 0.4 $ 5.8 $ 270.1 $ 515.3 Substandard — 0.5 — — — 0.4 — 0.9 Total $ 118.4 $ 120.4 $ 0.4 $ 0.3 $ 0.4 $ 6.2 $ 270.1 $ 516.2 Commercial construction: Pass $ 442.7 $ 374.8 $ 89.7 $ 45.9 $ 0.4 $ — $ 10.6 $ 964.1 Special mention 2.3 — 23.1 — — — 11.3 36.7 Substandard 16.8 24.4 — — — — — 41.2 Total $ 461.8 $ 399.2 $ 112.8 $ 45.9 $ 0.4 $ — $ 21.9 $ 1,042.0 Agricultural real estate: Pass $ 180.0 $ 172.8 $ 109.5 $ 64.8 $ 46.6 $ 105.1 $ 31.4 $ 710.2 Special mention 22.4 0.7 1.2 2.6 10.0 3.2 11.0 51.1 Substandard 1.8 12.3 3.5 0.6 2.7 11.3 0.1 32.3 Doubtful — — 1.3 — — — — 1.3 Total $ 204.2 $ 185.8 $ 115.5 $ 68.0 $ 59.3 $ 119.6 $ 42.5 $ 794.9 Commercial and floor plans: Pass $ 501.7 $ 358.9 $ 214.4 $ 124.3 $ 120.3 $ 171.1 $ 631.6 $ 2,122.3 Special mention 15.9 6.8 1.3 4.4 0.9 4.9 18.5 52.7 Substandard 9.8 3.3 3.7 3.4 3.2 2.1 47.2 72.7 Doubtful 0.3 1.3 — — — — 0.1 1.7 Total $ 527.7 $ 370.3 $ 219.4 $ 132.1 $ 124.4 $ 178.1 $ 697.4 $ 2,249.4 December 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 purpose secured by 1-4 family: Pass $ 191.7 $ 134.5 $ 69.8 $ 30.4 $ 29.9 $ 39.5 $ 28.9 $ 524.7 Special mention 0.1 1.2 2.1 0.2 1.4 0.2 — 5.2 Substandard 0.2 0.3 0.1 0.3 0.9 1.2 — 3.0 Total $ 192.0 $ 136.0 $ 72.0 $ 30.9 $ 32.2 $ 40.9 $ 28.9 $ 532.9 Agricultural: Pass $ 127.2 $ 59.7 $ 31.8 $ 10.6 $ 8.6 $ 3.1 $ 375.1 $ 616.1 Special mention 26.1 2.8 0.4 1.0 0.3 — 26.2 56.8 Substandard 22.8 4.6 2.8 0.6 1.2 0.2 0.8 33.0 Doubtful — 0.5 — — — — — 0.5 Total $ 176.1 $ 67.6 $ 35.0 $ 12.2 $ 10.1 $ 3.3 $ 402.1 $ 706.4 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 are considered nonperforming for purposes of credit quality evaluation. The following tables present the recorded investment of these loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated: As of and for the six months ended June 30, 2023 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted To Term Total Residential: Performing $ 33.4 $ 299.5 $ 507.7 $ 523.0 $ 96.9 $ 240.4 $ 476.6 $ 12.5 $ 2,190.0 Nonperforming 0.1 0.9 0.8 0.6 0.7 5.0 0.2 — 8.3 Total $ 33.5 $ 300.4 $ 508.5 $ 523.6 $ 97.6 $ 245.4 $ 476.8 $ 12.5 $ 2,198.3 Current-period gross charge-offs 0.3 — — 0.1 — 0.1 — — 0.5 Consumer indirect: Performing $ 86.7 $ 321.2 $ 142.8 $ 103.6 $ 44.7 $ 61.6 $ — $ — $ 760.6 Nonperforming 0.1 1.3 0.8 0.4 0.2 0.5 — — 3.3 Total $ 86.8 $ 322.5 $ 143.6 $ 104.1 $ 44.9 $ 62.2 $ — $ — $ 764.1 Current-period gross charge-offs — 1.3 1.2 0.5 0.1 0.3 — — 3.4 Consumer direct and advance line: Performing $ 23.9 $ 41.4 $ 24.2 $ 12.8 $ 5.4 $ 8.3 $ 27.4 $ 0.3 $ 143.7 Nonperforming — 0.1 0.1 — — 0.1 — — 0.3 Total $ 23.9 $ 41.5 $ 24.3 $ 12.8 $ 5.4 $ 8.4 $ 27.4 $ 0.3 $ 144.0 Current-period gross charge-offs — 0.1 0.1 0.1 0.1 1.4 0.1 — 1.9 Consumer credit card: Performing $ — $ — $ — $ — $ — $ — $ 71.6 $ — $ 71.6 Nonperforming — — — — — — 0.5 — 0.5 Total $ — $ — $ — $ — $ — $ — $ 72.1 $ — $ 72.1 Current-period gross charge-offs — — — — — — 1.4 — 1.4 December 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 $ 258.9 $ 490.3 $ 541.6 $ 98.0 $ 32.0 $ 213.8 $ — $ 1,634.6 Nonperforming — 0.2 0.1 0.5 0.3 3.7 — 4.8 Total $ 258.9 $ 490.5 $ 541.7 $ 98.5 $ 32.3 $ 217.5 $ — $ 1,639.4 Consumer home equity and HELOC: Performing $ 23.8 $ 8.0 $ 5.2 $ 5.5 $ 5.6 $ 15.2 $ 482.8 $ 546.1 Nonperforming 0.6 0.3 0.2 0.2 0.1 1.2 0.2 2.8 Total $ 24.4 $ 8.3 $ 5.4 $ 5.7 $ 5.7 $ 16.4 $ 483.0 $ 548.9 Consumer indirect: Performing $ 380.3 $ 176.4 $ 130.0 $ 59.7 $ 33.6 $ 46.3 $ — $ 826.3 Nonperforming 1.0 0.9 0.6 0.3 0.2 0.4 — 3.4 Total $ 381.3 $ 177.3 $ 130.6 $ 60.0 $ 33.8 $ 46.7 $ — $ 829.7 Consumer direct and advance line: Performing $ 52.6 $ 31.9 $ 18.2 $ 8.5 $ 6.5 $ 8.9 $ 25.8 $ 152.4 Nonperforming 0.1 0.1 0.1 — — 0.1 0.1 0.5 Total $ 52.7 $ 32.0 $ 18.3 $ 8.5 $ 6.5 $ 9.0 $ 25.9 $ 152.9 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 December 31, 2022 Consumer Commercial Agricultural Total Credit Card: Performing $ 75.4 $ 100.0 $ 1.9 $ 177.3 Nonperforming 0.5 0.3 — 0.8 Total credit card $ 75.9 $ 100.3 $ 1.9 $ 178.1

Other Real Estate Owned

Other Real Estate Owned	6 Months Ended
	Jun. 30, 2023
Repossessed Assets [Abstract]
Other Real Estate Owned	Other Real Estate Owned Other real estate owned (“OREO”) 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 OREO is reflected in the following table: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 13.4 $ 17.5 $ 12.7 $ 2.0 Acquired through acquisition — — — 15.8 Additions 1.7 0.1 2.5 0.1 Valuation adjustments (0.7) — (0.8) — Dispositions — (0.8) — (1.1) Ending balance $ 14.4 $ 16.8 $ 14.4 $ 16.8 The carrying value of foreclosed residential real estate properties included in OREO was $1.1 million as of June 30, 2023 and was not material as of December 31, 2022. The Company had $0.4 million and no material recorded investments in consumer mortgage loans secured by residential real estate for which formal foreclosure proceedings were in process of foreclosure as of June 30, 2023 and December 31, 2022, respectively.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	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 recorded at fair value with changes in fair value recorded through earnings. 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 recorded at fair value with changes in fair value recorded through earnings and are not designated as accounting hedges. 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 (loss). 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 income (expense) and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps and collars as part of its interest rate risk management strategy. Interest rate swaps that were designated as cash flow hedges on the variable-rate borrowings (trust preferred securities) 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 trust preferred securities. The trades that the Company had in place on its trust preferred securities matured during the first and second quarters of 2022. As part of the Company’s overall asset and liability management strategy, in August 2022 the Company entered into two interest rate collars related to variable-rate loans that were designated as cash flow hedges with a total notional amount of $300.0 million. Each of the collars designated as cash flow hedges synthetically fixes the interest income received by the Company when the collar index falls below a floor rate on a rate reset during the term of the collar and when the collar index exceeds the cap rate on a rate reset during the term of the collar without exchange of the underlying notional amount. In October 2022 the Company entered into four swaps, two of which were related to variable-rate loans and two that were related to variable-rate securities that were designated as cash flow hedges with a total notional amount of $850.0 million. Each of these swaps designated as cash flow hedges synthetically fixes the interest income received by the Company without exchange of the underlying notional amount. Of the six trades with a total notional amount of $1.15 billion, four are effective with a total notional of $600.0 million. Of these effective trades, the two collars and one swap are related to variable-rate loans and the other swap is related to variable-rate 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 income and subsequently reclassified into interest income (expense) in the same period(s) during which the hedged transaction affects earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified as interest income (expense) when interest payments are made on the Company’s variable-rate liabilities. During the next twelve months, the Company estimates that $12.2 million 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 the third quarter of 2022, the Company terminated the $200.0 million, three-year forward starting, four-year pay fixed interest rate swap, resulting in a $8.5 million gain that will be accreted into income through July 2028. 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 consolidated balance sheets related to cumulative basis adjustment for fair value hedges for the periods indicated: June 30, 2023 December 31, 2022 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 $ 192.6 $ 7.4 $ 191.9 $ 8.1 Non-designated Hedge Derivatives Derivatives not designated as accounting 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 entered into these credit risk participation agreements in instances in which the Company was 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 consolidated balance sheets. June 30, 2023 December 31, 2022 Notional Amount Consolidated Balance Sheet Location Estimated Notional Amount Consolidated Balance Sheet Location Estimated Derivatives designated as accounting hedges: Interest rate swap contracts $ — $ — $ 550.0 $ 3.5 Derivatives not designated as accounting hedges: Interest rate swap contracts 1,645.7 40.2 1,728.1 41.6 Forward loan sales contracts 13.4 — 12.6 0.1 Derivative assets $ 1,659.1 Other assets $ 40.2 $ 2,290.7 Other assets $ 45.2 Derivatives designated as accounting hedges: Interest rate collars $ 300.0 $ 7.0 $ 300.0 $ 5.4 Interest rate swap contracts 850.0 7.7 300.0 0.3 Derivatives not designated as accounting hedges: Interest rate swap contracts 1,645.7 148.3 1,728.1 153.9 Risk participation agreements 103.7 — 106.1 — Interest rate lock commitments 15.1 0.1 14.8 — Derivative liabilities $ 2,914.5 Accounts payable and accrued expenses $ 163.1 $ 2,449.0 Accounts payable and accrued expenses $ 159.6 There was a $14.7 million unrealized fair value loss on cash flow hedging derivative instruments in accumulated other comprehensive income during the three and the six months ended June 30, 2023. There were no material effects of derivative instruments in fair value or cash flow hedge accounting on accumulated other comprehensive loss during the three and the six months ended June 30, 2022. There were no material effects from the Company’s fair value or cash flow hedged derivative financial instruments on the consolidated statements of income during the three and the six months ended June 30, 2023 or 2022. The table below presents the effect of the Company’s derivative financial instruments that are not designated as hedging instruments on the consolidated statements of income for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Location of Gain Recognized in Income on Derivative Amount of Gain Recognized in Income on Derivative Location of Gain Recognized in Income on Derivative Amount of Gain Recognized in Income on Derivative Interest rate lock commitments Mortgage banking revenues $ 0.2 $ 1.0 Mortgage banking revenues $ 0.2 $ 1.5 The Company recorded swap fee revenues of $0.5 million and $1.1 million for the three months ended June 30, 2023 and June 30, 2022, and $6.5 million and $3.1 million for the six months ended June 30, 2023 and June 30, 2022. The Company includes swap fee revenues in other service charges, commissions, and fees on the consolidated statements of income. The tables below present the gross presentation, the effects of offsetting, and a net presentation of the Company’s derivatives as of the dates indicated: June 30, 2023 Gross Assets Recognized Gross Assets Offset in the Balance Sheet Net Assets in the Balance Sheet Financial Instruments Cash Collateral Received (1) Net Amount Interest rate swap contracts $ 40.2 $ — $ 40.2 $ — $ 36.4 $ 3.8 Total derivatives 40.2 — 40.2 — 36.4 3.8 Total assets $ 40.2 $ — $ 40.2 $ — $ 36.4 $ 3.8 (1) Netting adjustments represent the amounts recorded to convert derivatives assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The application of the collateral cannot reduce the net derivative position below zero. Therefore, excess collateral, if any, is not reflected above. 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 and collar contracts $ 163.0 $ — $ 163.0 $ — $ — $ 163.0 Interest rate lock commitments 0.1 — 0.1 — — 0.1 Total derivatives 163.1 — 163.1 — — 163.1 Repurchase agreements 929.9 — 929.9 — 929.9 — Total liabilities $ 1,093.0 $ — $ 1,093.0 $ — $ 929.9 $ 163.1 December 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 $ 45.1 $ — $ 45.1 $ — $ 45.1 $ — Mortgage related derivatives 0.1 — 0.1 — — 0.1 Total derivatives 45.2 — 45.2 — 45.1 0.1 Total assets $ 45.2 $ — $ 45.2 $ — $ 45.1 $ 0.1 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 $ 159.6 $ — $ 159.6 $ — $ — $ 159.6 Total derivatives 159.6 — 159.6 — — 159.6 Repurchase agreements 1,052.9 — 1,052.9 — 1,052.9 — Total liabilities $ 1,212.5 $ — $ 1,212.5 $ — $ 1,052.9 $ 159.6 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. 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.

Capital Stock

Capital Stock	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Capital Stock	Capital Stock The Company had 105,020,683 shares and 104,442,023 shares of Class A common stock outstanding as of June 30, 2023 and December 31, 2022, respectively. The Company completed the stock repurchase program adopted by the Company’s board of directors in 2022 and the Company’s board of directors has not authorized a stock repurchase program for 2023. There were 1,720,700 shares repurchased and retired under the stock repurchase program during the three and six months ended June 30, 2022 at a total cost of $64.3 million, including costs and commissions, at an average cost of $37.38 per share. Other stock repurchases during the six months ended June 30, 2023 and 2022, 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. During the six months ended June 30, 2023, the Company issued 54,414 shares 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 of $1.2 million is amortized into stock-based compensation expense in the accompanying consolidated statements of changes in stockholders' equity over a one year service based period. On May 25, 2023, the Company filed a Registration Statement on Form S-8 to register an additional 2,000,000 shares of common stock to be issued pursuant to the Company's 2023 Equity and Incentive Plan. On May 26, 2023, the Company filed a universal shelf registration statement on Form S-3, which was subsequently declared effective by the SEC. The shelf registration statement allows the Company to raise additional capital from time to time through offers and sales of registered securities consisting of debt securities, preferred stock, depositary shares, common stock, warrants, purchase contracts, and units or units consisting of any combination of the foregoing securities. The Company may sell these securities using the prospectus in the shelf registration statement, together with applicable prospectus supplements, from time to time, in one or more offerings.

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common ShareBasic 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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net income $ 67.0 $ 64.1 $ 123.3 $ 30.7 Weighted average common shares outstanding for basic earnings per share computation 103,820,649 109,106,891 103,779,386 101,025,926 Dilutive effects of stock-based compensation 2,242 24,827 42,539 50,405 Weighted average common shares outstanding for diluted earnings per common share computation 103,822,891 109,131,718 103,821,925 101,076,331 Basic earnings per common share $ 0.65 $ 0.59 $ 1.19 $ 0.30 Diluted earnings per common share $ 0.65 $ 0.59 $ 1.19 $ 0.30 Anti-dilutive unvested time restricted stock 222,417 218,033 129,449 61,058

Regulatory Capital

Regulatory Capital	6 Months Ended
	Jun. 30, 2023
Banking and Thrift, Other Disclosure [Abstract]
Regulatory Capital	As of June 30, 2023 and December 31, 2022, 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 June 30, 2023 and December 31, 2022 are presented in the following tables: Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer (1) Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements (2) June 30, 2023 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 2,925.7 12.90 % $ 1,815.1 8.00 % $ 2,382.3 10.50 % $ 2,268.9 10.00 % FIB 2,759.2 12.18 1,812.7 8.00 2,379.2 10.50 2,265.9 10.00 Tier 1 risk-based capital: Consolidated 2,440.5 10.76 1,361.3 6.00 1,928.5 8.50 1,815.1 8.00 FIB 2,530.9 11.17 1,359.6 6.00 1,926.0 8.50 1,812.7 8.00 Common equity tier 1 risk-based capital: Consolidated 2,440.5 10.76 1,021.0 4.50 1,588.2 7.00 1,474.8 6.50 FIB 2,530.9 11.17 1,019.7 4.50 1,586.1 7.00 1,472.9 6.50 Leverage capital ratio: Consolidated 2,440.5 7.99 1,222.3 4.00 1,222.3 4.00 1,527.8 5.00 FIB 2,530.9 8.29 1,220.6 4.00 1,220.6 4.00 1,525.8 5.00 Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer (1) Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements (2) December 31, 2022 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 2,875.8 12.48 % $ 1,843.2 8.00 % $ 2,419.2 10.50 % $ 2,304.0 10.00 % FIB 2,713.5 11.80 1,839.6 8.00 2,414.5 10.50 2,299.5 10.00 Tier 1 risk-based capital: Consolidated 2,408.8 10.45 1,382.4 6.00 1,958.4 8.50 1,843.2 8.00 FIB 2,504.1 10.89 1,379.7 6.00 1,954.6 8.50 1,839.6 8.00 Common equity tier 1 risk-based capital: Consolidated 2,408.8 10.45 1,036.8 4.50 1,612.8 7.00 1,497.6 6.50 FIB 2,504.1 10.89 1,034.8 4.50 1,609.7 7.00 1,494.7 6.50 Leverage capital ratio: Consolidated 2,408.8 7.75 1,242.9 4.00 1,242.9 4.00 1,553.6 5.00 FIB 2,504.1 8.07 1,241.1 4.00 1,241.1 4.00 1,551.4 5.00 (1) The capital conservation buffer is an additional 2.5% of the amount necessary to meet the minimum risk-based capital requirements for total, tier 1, and common equity tier 1 risk-based capital. (2) 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

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2023
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 June 30, 2023, the Company had commitments under construction contracts of $8.4 million.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	6 Months Ended
	Jun. 30, 2023
Financial Instruments with Off-Balance Sheet Risk [Abstract]
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 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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 17.8 $ 6.2 $ 16.2 $ 3.8 Provision for credit loss expense 3.0 — 4.6 2.4 Ending balance $ 20.8 $ 6.2 $ 20.8 $ 6.2 June 30, 2023 December 31, 2022 Unused credit card lines $ 809.7 $ 827.6 Commitments to extend credit 4,711.7 5,173.3 Standby letters of credit 96.7 93.8

Other Comprehensive Income_Loss

Other Comprehensive Income/Loss	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Other Comprehensive Income/Loss	Other Comprehensive Income (Loss) The gross amounts of each component of other comprehensive income (loss) and the related tax effects are as follows: Pre-tax Tax Expense (Benefit) Net of Tax Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Investment securities available-for sale: Change in net unrealized gains (losses) during the period $ (57.5) $ (161.6) $ (14.4) $ (45.2) $ (43.1) $ (116.4) Reclassification adjustment for net losses included in income 0.1 0.1 — — 0.1 0.1 Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity (0.4) (0.9) (0.1) (0.2) (0.3) (0.7) Change in net unrealized loss on derivatives (22.1) (15.0) (5.5) (4.2) (16.6) (10.8) Total other comprehensive income (loss) $ (79.9) $ (177.4) $ (20.0) $ (49.6) $ (59.9) $ (127.8) Pre-tax Tax Expense (Benefit) Net of Tax Six Months Ended June 30, 2023 2022 2023 2022 2023 2022 Investment securities available-for sale: Change in net unrealized loss during period $ 20.7 $ (414.2) $ 5.2 $ (107.9) $ 15.5 $ (306.3) Reclassification adjustment for net loss (gain) included in net income 23.5 0.2 5.8 — 17.7 0.2 Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale (7.2) 0.2 (1.8) 0.1 (5.4) 0.1 Net change in unamortized (gains) losses on available-for-sale securities transferred into held-to-maturity (0.8) (23.9) (0.2) (5.9) (0.6) (18.0) Change in net unrealized gain (loss) on derivatives (12.1) 6.3 (3.0) 1.1 (9.1) 5.2 Total other comprehensive loss $ 24.1 $ (431.4) $ 6.0 $ (112.6) $ 18.1 $ (318.8) The components of accumulated other comprehensive loss, net of related tax effects, are as follows: June 30, 2023 December 31, 2022 Net unrealized loss on investment securities available-for-sale $ (443.2) $ (471.0) Net unrealized loss on investment securities transferred to held-to-maturity (5.2) (4.5) Net unrealized loss on derivatives (10.6) (1.6) Net accumulated other comprehensive loss $ (459.0) $ (477.1)

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2023
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 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 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 and the six months ended June 30, 2023 and 2022. 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 significant transfers between fair value hierarchy levels during the three and the six months ended June 30, 2023 and 2022. 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 others. 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 Collars: The fair values of interest rate collars are obtained from an independent third party. The values are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fell below (rise above) the strike rate of the floors (caps). The variable interest rates used in the calculation of projected receipts on the collars are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. 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, was not significant in the reported periods. The Company also compares the reasonableness of the pricing semi-annually through a validation process involving additional independent third parties. Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are obtained from an independent third party. The values 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 United States Dollar – Secured Overnight Financing Rate (“SOFR”) forward curve to estimate variable rate cash inflows and the SOFR 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, was not significant in the reported periods. The Company also compares the reasonableness of the pricing semi-annually through a validation process involving additional independent third parties. For purposes of potential valuation adjustments to our derivative positions, we evaluate both our credit risk and the credit risk of our counterparties. 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 June 30, 2023 Fair Value Quoted Prices in Significant Other Significant Investment debt securities available-for-sale: U.S. Treasury notes $ 219.1 $ — $ 219.1 $ — State, county, and municipal securities 214.9 — 214.9 — Obligations of U.S. government agencies 172.0 — 172.0 — U.S. agency commercial mortgage-backed securities 1,102.4 — 1,102.4 — U.S. agency residential mortgage-backed securities 1,375.4 — 1,375.4 — Collateralized mortgage obligations 1,205.2 — 1,205.2 — Private mortgage-backed securities 217.1 — 217.1 — Collateralized loan obligations 1,124.3 — 1,124.3 — Corporate securities 227.5 — 227.5 — Loans held for sale 18.4 — 11.0 7.4 Derivative assets: Interest rate swap contracts 40.2 — 40.2 — Derivative liabilities: Interest rate collars 7.0 — 7.0 — Interest rate swap contracts 156.0 — 156.0 — Interest rate lock commitments 0.1 — 0.1 — Deferred compensation plan assets 18.4 — 18.4 — Deferred compensation plan liabilities 18.4 — 18.4 — Fair Value Measurements at Reporting Date Using As of December 31, 2022 Fair Value Quoted Prices in Significant Other Significant Investment debt securities available-for-sale: U.S. Treasury notes $ 642.7 $ — $ 642.7 $ — State, county and municipal securities 263.7 — 263.7 — Obligations of U.S. government agencies 198.9 — 198.9 — U.S. agency commercial mortgage-backed securities 1,351.2 — 1,351.2 — U.S. agency residential mortgage-backed securities 1,558.3 — 1,558.3 — Collateralized mortgage obligations 1,350.2 — 1,350.2 — Private mortgage-backed securities 228.0 — 228.0 — Collateralized loan obligations 1,111.6 — 1,111.6 — Corporate securities 241.5 — 241.5 — Loans held for sale 12.4 — 6.9 5.5 Derivative assets: Interest rate swap contracts 45.1 — 45.1 — Forward loan sales contracts 0.1 — 0.1 — Derivative liabilities Interest rate collars 5.4 — 5.4 — Interest rate swap contracts 154.2 — 154.2 — Deferred compensation plan assets 18.7 — 18.7 — Deferred compensation plan liabilities 18.7 — 18.7 — 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 June 30, 2023 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Significant Collateral-dependent loans $ 63.5 $ — $ — $ 63.5 Loans held for sale 58.1 — — 58.1 Other real estate owned 14.4 — — 14.4 Long-lived assets to be disposed of by sale 4.6 — — 4.6 Fair Value Measurements at Reporting Date Using As of December 31, 2022 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Significant Collateral-dependent loans $ 39.1 $ — $ — $ 39.1 Loans held for sale 67.5 — — 67.5 Other real estate owned 12.7 — — 12.7 Long-lived assets to be disposed of by sale 5.5 — — 5.5 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 June 30, 2023 and December 31, 2022, the Company had collateral-dependent loans with a carrying and fair value of $63.5 million and $39.1 million, respectively. Loans Held for Sale. Fair value measurements for non-residential mortgage loans held for sale are derived from valuations, appraisals, and quotes or bids from third party investors. 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. 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 $0.8 million and no material write downs on OREO properties during the six months ended June 30, 2023 and 2022, 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 June 30, 2023, the Company had long-lived assets to be disposed of by sale with carrying values aggregating $9.3 million, reduced by write-downs of $4.7 million charged to other expense, and fair values aggregating $4.6 million. As of December 31, 2022, the Company had long-lived assets to be disposed of by sale with carrying values aggregating $5.7 million, reduced by write-downs of $0.2 million charged to other expense, and fair values aggregating $5.5 million. 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 June 30, 2023 December 31, 2022 Valuation Unobservable Range Collateral-dependent loans $ 63.5 $ 39.1 Appraisal Appraisal adjustment 0% - 45% (7%) Loans held for sale 58.1 67.5 Fair value of collateral Discount for type of property, age of appraisal, and current status 11% - 23% (17%) Other real estate owned 14.4 12.7 Appraisal Appraisal adjustment 15% - 36% (22%) Long-lived assets to be disposed of by sale 4.6 5.5 Appraisal Appraisal adjustment 0% - 6% (3%) 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 United States Dollar – SOFR forward curve, the federal funds effective swap rate and cash flows, among other things. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, other borrowed funds, 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 June 30, 2023 Carrying Amount Estimated Quoted Prices in Active Markets for Significant Other Significant Financial assets: Cash and cash equivalents $ 680.5 $ 680.5 $ 680.5 $ — $ — Investment debt securities available-for-sale 5,857.9 5,857.9 — 5,857.9 — Investment debt securities held-to-maturity 3,317.7 2,924.7 — 2,924.7 — Accrued interest receivable 119.1 119.1 — 119.1 — Mortgage servicing rights, net 29.8 38.2 — 38.2 — Loans held for sale 76.5 76.5 — 11.0 65.5 Net loans held for investment 18,038.8 17,519.5 — 17,456.0 63.5 Derivative assets 40.2 40.2 — 40.2 — Deferred compensation plan assets 18.4 18.4 — 18.4 — Total financial assets $ 28,178.9 $ 27,275.0 $ 680.5 $ 26,465.5 $ 129.0 Financial liabilities: Total deposits, excluding time deposits $ 20,836.8 $ 20,836.8 $ 20,836.8 $ — $ — Time deposits 2,742.4 2,695.4 — 2,695.4 — Securities sold under repurchase agreements 929.9 929.9 — 929.9 — Other borrowed funds 2,589.0 2,589.0 — 2,589.0 — Accrued interest payable 45.8 45.8 — 45.8 — Long-term debt 120.8 112.3 — 112.3 — Subordinated debentures held by subsidiary trusts 163.1 154.0 — 154.0 — Derivative liabilities 163.1 163.1 — 163.1 — Deferred compensation plan liabilities 18.4 18.4 — 18.4 — Total financial liabilities $ 27,609.3 $ 27,544.7 $ 20,836.8 $ 6,707.9 $ — Fair Value Measurements at Reporting Date Using As of December 31, 2022 Carrying Amount Estimated Quoted Prices in Active Markets for Significant Other Significant Financial assets: Cash and cash equivalents $ 870.5 $ 870.5 $ 870.5 $ — $ — Investment debt securities available-for-sale 6,946.1 6,946.1 — 6,946.1 — Investment debt securities held-to-maturity 3,451.8 3,052.2 — 3,052.2 — Accrued interest receivable 118.3 118.3 — 118.3 — Mortgage servicing rights, net 31.1 37.4 — 37.4 — Loans held for sale 79.9 79.9 — 6.9 73.0 Net loans held for investment 17,879.1 17,552.1 — 17,513.0 39.1 Derivative assets 45.2 45.2 — 45.2 — Deferred compensation plan assets 18.7 18.7 — 18.7 — Total financial assets $ 29,440.7 $ 28,720.4 $ 870.5 $ 27,737.8 $ 112.1 Financial liabilities: Total deposits, excluding time deposits $ 23,145.2 $ 23,145.2 $ 23,145.2 $ — $ — Time deposits 1,928.4 1,876.1 — 1,876.1 — Securities sold under repurchase agreements 1,052.9 1,052.9 — 1,052.9 — Other borrowed funds 2,327.0 2,327.0 — 2,327.0 — Accrued interest payable 14.5 14.5 — 14.5 — Long-term debt 120.8 116.3 — 116.3 — Subordinated debentures held by subsidiary trusts 163.1 155.8 — 155.8 — Derivative liabilities 159.6 159.6 — 159.6 — Deferred compensation plan liabilities 18.7 18.7 — 18.7 — Total financial liabilities $ 28,930.2 $ 28,866.1 $ 23,145.2 $ 5,720.9 $ —

Other Borrowed Funds

Other Borrowed Funds	6 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Long-Term Debt	At June 30, 2023, the Company had $2,589.0 million in outstanding FHLB borrowings consisting of $553.0 million in fixed rate borrowings with tenors of up to two weeks and with an average fixed rate of 5.30%, $450.0 million in fixed rate borrowings with tenors of up to one month and with an average fixed rate of 5.39%, $600.0 million in 2-month fixed rate borrowings with an average fixed rate of 5.38%, $150.0 million in 3-month fixed rate borrowings with an average fixed rate of 5.56%, $400.0 million in 4-month fixed rate borrowings with an average fixed rate of 5.54%, and $436.0 million in 5-month fixed rate borrowings with an average fixed rate of 5.56%, as compared to $2,327.0 million outstanding borrowings with the FHLB at December 31, 2022. The Company has remaining available lines of credit with the FHLB of approximately $4,517.6 million, subject to collateral availability at June 30, 2023. The borrowings are collateralized by certain loans with an advance equivalent collateral value of $7,106.6 million. As of June 30, 2023 and December 31, 2022, there were no long or short-term advances outstanding with the FHLB. As of June 30, 2023 and December 31, 2022, the Company had no material other borrowed funds.

Recent Authoritative Accounting

Recent Authoritative Accounting Guidance	6 Months Ended
	Jun. 30, 2023
Accounting Policies [Abstract]
Recent Authoritative Accounting Guidance	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. Based upon the amendments provided in ASU 2022-06 discussed below, ASU 2020-04 can generally be applied through December 31, 2024. 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. 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. Based upon the amendments provided in ASU 2022-06 discussed below, ASU 2021-01 can generally be applied through December 31, 2024. 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. The amendments in this ASU became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. 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. The amendments in this ASU became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. 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. The amendments in this ASU became effective for the Company on January 1, 2023 on a prospective basis, and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. Prior to the adoption of ASU 2022-02, a TDR occurred when a loan to a borrower experiencing financial difficulty was restructured with a concession provided that a creditor would not otherwise consider. For the Company’s accounting policy related to TDRs granted prior to the adoption of ASU 2022-02, see “Note 1 – Summary of Significant Accounting Policies” in Part IV, Item 15 “Notes to Consolidated Financial Statements” within our Annual Report on Form 10-K for the year ended December 31, 2022. See “Note 6 – Loans Held For Investment” of these Notes to the Unaudited Consolidated Financial Statements” for further details of the amendments in this update. ASU 2022-06, “ Reference Rate Reform (Topic 848), Deferral of the Sunset Date of Topic 848 ” In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848), Deferral of the Sunset Date of Topic 848 that extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 and ASU 2021-01, which are discussed above. ASU 2022-06, which was effective upon issuance, defers the sunset date of this prior guidance from December 31, 2022 to December 31, 2024, after which entities will no longer be permitted to apply the relief guidance in Topic 848. The adoption of ASU 2022-06 did not have a significant impact on the Company’s financial position, results of operations, or liquidity. ASU 2023-02, “ Investments—Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method ” In March 2023, the FASB issued ASU 2023-02, Investments—Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method that permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously, this method was only available for qualifying tax equity investments in low-income housing tax credit structures. The amendments also require that a reporting entity disclose certain information in annual and interim reporting periods that enable investors to understand certain information about its investments that generate income tax credits and other income tax benefits from a tax credit program. For public business entities, the amendments are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted for all entities in any interim period. If an entity adopts the amendments in an interim period, it shall adopt them as of the beginning of the fiscal year that includes that interim period. The amendments must be applied on either a modified retrospective or a retrospective basis (except for certain LIHTC investments not accounted for using the proportional amortization method). 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, results of operations, or liquidity.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2023
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 July 25, 2023, the Company declared a quarterly dividend to common shareholders of $0.47 per share, to be paid on August 17, 2023 to shareholders of record as of August 7, 2023. No other undisclosed events requiring recognition or disclosure were identified.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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 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 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 and the six months ended June 30, 2023 and 2022. 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 significant transfers between fair value hierarchy levels during the three and the six months ended June 30, 2023 and 2022. 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 others. 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 Collars: The fair values of interest rate collars are obtained from an independent third party. The values are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fell below (rise above) the strike rate of the floors (caps). The variable interest rates used in the calculation of projected receipts on the collars are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. 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, was not significant in the reported periods. The Company also compares the reasonableness of the pricing semi-annually through a validation process involving additional independent third parties. Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are obtained from an independent third party. The values 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 United States Dollar – Secured Overnight Financing Rate (“SOFR”) forward curve to estimate variable rate cash inflows and the SOFR 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, was not significant in the reported periods. The Company also compares the reasonableness of the pricing semi-annually through a validation process involving additional independent third parties. For purposes of potential valuation adjustments to our derivative positions, we evaluate both our credit risk and the credit risk of our counterparties. 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.
Recent Authoritative Accounting Guidance	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. Based upon the amendments provided in ASU 2022-06 discussed below, ASU 2020-04 can generally be applied through December 31, 2024. 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. 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. Based upon the amendments provided in ASU 2022-06 discussed below, ASU 2021-01 can generally be applied through December 31, 2024. 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. The amendments in this ASU became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. 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. The amendments in this ASU became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. 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. The amendments in this ASU became effective for the Company on January 1, 2023 on a prospective basis, and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. Prior to the adoption of ASU 2022-02, a TDR occurred when a loan to a borrower experiencing financial difficulty was restructured with a concession provided that a creditor would not otherwise consider. For the Company’s accounting policy related to TDRs granted prior to the adoption of ASU 2022-02, see “Note 1 – Summary of Significant Accounting Policies” in Part IV, Item 15 “Notes to Consolidated Financial Statements” within our Annual Report on Form 10-K for the year ended December 31, 2022. See “Note 6 – Loans Held For Investment” of these Notes to the Unaudited Consolidated Financial Statements” for further details of the amendments in this update. ASU 2022-06, “ Reference Rate Reform (Topic 848), Deferral of the Sunset Date of Topic 848 ” In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848), Deferral of the Sunset Date of Topic 848 that extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 and ASU 2021-01, which are discussed above. ASU 2022-06, which was effective upon issuance, defers the sunset date of this prior guidance from December 31, 2022 to December 31, 2024, after which entities will no longer be permitted to apply the relief guidance in Topic 848. The adoption of ASU 2022-06 did not have a significant impact on the Company’s financial position, results of operations, or liquidity. ASU 2023-02, “ Investments—Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method ” In March 2023, the FASB issued ASU 2023-02, Investments—Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method that permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously, this method was only available for qualifying tax equity investments in low-income housing tax credit structures. The amendments also require that a reporting entity disclose certain information in annual and interim reporting periods that enable investors to understand certain information about its investments that generate income tax credits and other income tax benefits from a tax credit program. For public business entities, the amendments are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted for all entities in any interim period. If an entity adopts the amendments in an interim period, it shall adopt them as of the beginning of the fiscal year that includes that interim period. The amendments must be applied on either a modified retrospective or a retrospective basis (except for certain LIHTC investments not accounted for using the proportional amortization method). 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, results of operations, or liquidity.
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts	The allowance for credit losses is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected over the life of the loans. Loans are charged off against the allowance when management confirms that a loan balance is uncollectable. The Company applies recoveries when received and has elected not to forecast recoveries. Management estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix and trends, asset quality, or term as well as for changes in environmental and economic conditions, such as changes in unemployment rates, property values, or other relevant factors. The allowance for credit losses is measured on a collective basis when similar risk characteristics exist. Annualized loss rates are recalculated quarterly, with subsequent recoveries captured in the quarter a loan was charged off, and are averaged across a look back period from 2009 to the current period. Expected future principal and interest cash flows are calculated using contractual repayment terms while considering prepayment, utilization, interest rate, and probability of default assumptions. Macroeconomic models calculate segment-specific multipliers using third party forecast data. The multipliers adjust the annual loss rates to the level expected under the economic conditions over the 2-year forecast period, followed by a 1-year straight-line reversion to the unadjusted historical average loss rates. The unadjusted loss rates then apply for the remaining life of the loan. Estimated losses are totaled and aggregated to the portfolio segment level. The Company segments the loan portfolio into pools based on the following risk characteristics: financial asset type, collateral type, loan structure, credit characteristics, outstanding loan balances, contractual terms and prepayment assumptions, utilization assumptions, industry of borrower and concentrations, and historical or expected credit loss.
Off-Balance-Sheet Credit Exposure, Policy	Allowance for Credit Losses on Off-Balance Sheet Credit Exposures. The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit unless that obligation is unconditionally cancellable by the Company. Management considers our unused credit card lines and federal fund lines, extended to others, to be unconditionally cancellable. The allowance for credit losses on off-balance sheet credit exposures is adjusted as a provision for credit loss expense. The estimate considers the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over the estimated life.

Accounting Changes and Error Co

Accounting Changes and Error Corrections (Policies)	6 Months Ended
	Jun. 30, 2023
Accounting Changes and Error Corrections [Abstract]
Recent Authoritative Accounting Guidance	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. Based upon the amendments provided in ASU 2022-06 discussed below, ASU 2020-04 can generally be applied through December 31, 2024. 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. 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. Based upon the amendments provided in ASU 2022-06 discussed below, ASU 2021-01 can generally be applied through December 31, 2024. 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. The amendments in this ASU became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. 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. The amendments in this ASU became effective for the Company on January 1, 2023 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. 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. The amendments in this ASU became effective for the Company on January 1, 2023 on a prospective basis, and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. Prior to the adoption of ASU 2022-02, a TDR occurred when a loan to a borrower experiencing financial difficulty was restructured with a concession provided that a creditor would not otherwise consider. For the Company’s accounting policy related to TDRs granted prior to the adoption of ASU 2022-02, see “Note 1 – Summary of Significant Accounting Policies” in Part IV, Item 15 “Notes to Consolidated Financial Statements” within our Annual Report on Form 10-K for the year ended December 31, 2022. See “Note 6 – Loans Held For Investment” of these Notes to the Unaudited Consolidated Financial Statements” for further details of the amendments in this update. ASU 2022-06, “ Reference Rate Reform (Topic 848), Deferral of the Sunset Date of Topic 848 ” In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848), Deferral of the Sunset Date of Topic 848 that extends the period of time preparers can utilize the reference rate reform relief guidance provided by ASU 2020-04 and ASU 2021-01, which are discussed above. ASU 2022-06, which was effective upon issuance, defers the sunset date of this prior guidance from December 31, 2022 to December 31, 2024, after which entities will no longer be permitted to apply the relief guidance in Topic 848. The adoption of ASU 2022-06 did not have a significant impact on the Company’s financial position, results of operations, or liquidity. ASU 2023-02, “ Investments—Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method ” In March 2023, the FASB issued ASU 2023-02, Investments—Equity Method and Joint Ventures (Topic 323), Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method that permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Previously, this method was only available for qualifying tax equity investments in low-income housing tax credit structures. The amendments also require that a reporting entity disclose certain information in annual and interim reporting periods that enable investors to understand certain information about its investments that generate income tax credits and other income tax benefits from a tax credit program. For public business entities, the amendments are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted for all entities in any interim period. If an entity adopts the amendments in an interim period, it shall adopt them as of the beginning of the fiscal year that includes that interim period. The amendments must be applied on either a modified retrospective or a retrospective basis (except for certain LIHTC investments not accounted for using the proportional amortization method). 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, results of operations, or liquidity.

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2023
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	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 217.0 Loans held for investment 7,705.0 Allowance for credit losses (59.5) Premises and equipment, including right of use lease assets 144.7 Other real estate owned 15.8 Company-owned life insurance 186.6 Core deposit intangibles 50.1 Customer relationship intangible 22.8 Mortgage servicing rights 1.3 Deferred tax assets, net 60.2 Other assets 200.8 Total assets acquired 13,351.8 Liabilities assumed: Deposits 11,688.0 Securities sold under repurchase agreements 74.0 Accrued expenses and other liabilities 110.4 FHLB advances 122.9 Subordinated debt 36.4 Subordinated debentures held by subsidiary trusts 76.1 Total liabilities assumed 12,107.8 Net assets acquired $ 1,244.0 Consideration paid: Class A common stock 1,723.3 Total consideration paid (1) $ 1,723.3 Goodwill $ 479.3 (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 and the six month periods ended June 30, 2022 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 June 30, Six Months Ended June 30, 2022 2022 Total revenues $ 300.7 $ 569.6 Net income $ 101.1 $ 177.5 Earnings per common share (Basic) $ 0.93 $ 1.76 Earnings per common share (Diluted) $ 0.93 $ 1.76

Goodwill and Core Deposit Int_2

Goodwill and Core Deposit Intangibles (Tables)	6 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
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 June 30, 2023 and December 31, 2022: June 30, 2023 CDI OCRI Total Gross other intangible assets, at January 1, 2023 $ 154.7 $ 22.8 $ 177.5 Accumulated amortization (85.7) (2.7) (88.4) Net other intangible assets, at June 30, 2023 $ 69.0 $ 20.1 $ 89.1 December 31, 2022 Gross other intangible assets, at January 1, 2022 $ 106.0 $ — $ 106.0 Amounts established through acquisition 50.1 22.8 72.9 Reductions due to sale of health savings accounts (1.4) — (1.4) Accumulated amortization (78.8) (1.7) (80.5) Net other intangible assets, at December 31, 2022 $ 75.9 $ 21.1 $ 97.0
Schedule of Future Amortization Expense	The following table provides the estimated aggregate future amortization expense of other intangible assets at June 30, 2023: Years Ending December 31, CDI OCRI Total 2023 remaining $ 6.8 $ 0.9 $ 7.7 2024 12.7 1.9 14.6 2025 11.8 1.9 13.7 2026 10.9 1.9 12.8 2027 8.2 1.9 10.1 Thereafter 18.6 11.6 30.2 Total $ 69.0 $ 20.1 $ 89.1

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2023
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: June 30, 2023 Amortized Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Available-for-Sale: U.S. Treasury notes $ 250.1 $ — $ 250.1 $ — $ (31.0) $ 219.1 State, county, and municipal securities 258.1 — 258.1 — (43.2) 214.9 Obligations of U.S. government agencies 186.4 — 186.4 — (14.4) 172.0 U.S. agency commercial mortgage-backed securities 1,212.9 — 1,212.9 0.2 (110.7) 1,102.4 U.S. agency residential mortgage-backed securities 1,534.5 — 1,534.5 — (159.1) 1,375.4 Collateralized mortgage obligations 1,350.8 — 1,350.8 — (145.6) 1,205.2 Private mortgage-backed securities 253.5 — 253.5 — (36.4) 217.1 Collateralized loan obligations 1,141.8 — 1,141.8 — (17.5) 1,124.3 Corporate securities 261.5 (1.4) 260.1 — (32.6) 227.5 Other investments — — — — — Total $ 6,449.6 $ (1.4) $ 6,448.2 $ 0.2 $ (590.5) $ 5,857.9 June 30, 2023 Amortized Cost 1 Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Held-to-Maturity: U.S. Treasury notes $ 397.8 $ — $ 397.8 $ — $ (8.9) $ 388.9 State, county, and municipal securities 180.5 — 180.5 0.2 (27.0) 153.7 Obligations of U.S. government agencies 353.1 — 353.1 — (48.9) 304.2 U.S. agency commercial mortgage-backed securities 517.8 — 517.8 — (61.4) 456.4 U.S. agency residential mortgage-backed securities 1,311.4 — 1,311.4 — (160.7) 1,150.7 Collateralized mortgage obligations 500.7 — 500.7 0.2 (78.7) 422.2 Corporate securities 57.1 (0.7) 56.4 — (7.8) 48.6 Total $ 3,318.4 $ (0.7) $ 3,317.7 $ 0.4 $ (393.4) $ 2,924.7 (1) Amortized cost presented above includes $12.3 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, and $19.2 million of unamortized losses in state, county, and municipal, obligations of U.S. government agencies and collateralized loan obligations related to the 2022 transfer of securities from available-for-sale to held-to-maturity. December 31, 2022 Amortized Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Available-for-Sale: U.S. Treasury notes $ 675.1 $ — $ 675.1 $ 2.1 $ (34.5) $ 642.7 State, county, and municipal securities 314.3 — 314.3 — (50.6) 263.7 Obligations of U.S. government agencies 216.2 — 216.2 — (17.3) 198.9 U.S. agency commercial mortgage-backed securities 1,468.0 — 1,468.0 0.2 (117.0) 1,351.2 U.S. agency residential mortgage-backed securities 1,726.0 — 1,726.0 — (167.7) 1,558.3 Collateralized mortgage obligations 1,491.5 — 1,491.5 — (141.3) 1,350.2 Private mortgage-backed securities 264.9 — 264.9 — (36.9) 228.0 Collateralized loan obligations 1,145.2 — 1,145.2 — (33.6) 1,111.6 Corporate securities 272.3 — 272.3 — (30.8) 241.5 Other investments — — — — — — Total $ 7,573.5 $ — $ 7,573.5 $ 2.3 $ (629.7) $ 6,946.1 December 31, 2022 Amortized Cost 1 Allowance for Credit Losses Net Amortized Cost Gross Gross Estimated Held-to-Maturity: U.S. Treasury notes $ 396.6 $ — $ 396.6 $ — $ (10.2) $ 386.4 State, county, and municipal securities 181.2 (0.1) 181.1 0.2 (31.6) 149.7 Obligations of U.S. government agencies 351.7 — 351.7 — (49.6) 302.1 U.S. agency commercial mortgage-backed securities 526.8 — 526.8 — (58.3) 468.5 U.S. agency residential mortgage-backed securities 1,391.5 — 1,391.5 — (166.6) 1,224.9 Collateralized mortgage obligations 525.8 — 525.8 0.2 (76.7) 449.3 Corporate securities 80.1 (1.8) 78.3 — (7.0) 71.3 Other investments — — — — — — Total $ 3,453.7 $ (1.9) $ 3,451.8 $ 0.4 $ (400.0) $ 3,052.2 (1) Amortized cost presented above includes $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 available-for-sale investment securities and the length of time individual investment securities have been in an unrealized loss position as of June 30, 2023 and December 31, 2022. Less than 12 Months 12 Months or More Total June 30, 2023 Fair Gross Fair Gross Fair Gross Available-for-Sale: U.S. Treasury notes $ 47.2 $ (2.3) $ 171.9 $ (28.7) $ 219.1 $ (31.0) State, county, and municipal securities 9.0 (0.4) 204.0 (42.8) 213.0 (43.2) Obligations of U.S. government agencies 60.6 (3.1) 111.0 (11.3) 171.6 (14.4) U.S. agency commercial mortgage-backed securities 396.0 (23.7) 696.8 (87.0) 1,092.8 (110.7) U.S. agency residential mortgage-backed securities 272.5 (15.7) 1,102.8 (143.4) 1,375.3 (159.1) Collateralized mortgage obligations 312.6 (20.9) 892.6 (124.7) 1,205.2 (145.6) Private mortgage-backed securities — — 217.1 (36.4) 217.1 (36.4) Collateralized loan obligations — — 1,124.3 (17.5) 1,124.3 (17.5) Corporate securities 16.3 (0.9) 211.2 (31.7) 227.5 (32.6) Other securities — — — — — — Total $ 1,114.2 $ (67.0) $ 4,731.7 $ (523.5) $ 5,845.9 $ (590.5) Less than 12 Months 12 Months or More Total December 31, 2022 Fair Gross Fair Gross Fair Gross Available-for-Sale: U.S. Treasury notes $ 168.8 $ (4.7) $ 170.4 $ (29.8) $ 339.2 $ (34.5) State, county, and municipal securities 104.9 (9.0) 146.1 (41.6) 251.0 (50.6) Obligations of U.S. government agencies 152.2 (10.1) 46.1 (7.2) 198.3 (17.3) U.S. agency commercial mortgage-backed securities 1,069.8 (59.9) 270.8 (57.0) 1,340.6 (116.9) U.S. agency residential mortgage-backed securities 1,213.5 (112.3) 344.6 (55.4) 1,558.1 (167.7) Collateralized mortgage obligations 1,016.4 (90.1) 333.0 (51.3) 1,349.4 (141.4) Private mortgage-backed securities 133.1 (19.1) 94.9 (17.8) 228.0 (36.9) Collateralized loan obligations 1,082.6 (33.1) 28.9 (0.5) 1,111.5 (33.6) Corporate securities 130.6 (8.3) 110.8 (22.5) 241.4 (30.8) Total $ 5,071.9 $ (346.6) $ 1,545.6 $ (283.1) $ 6,617.5 $ (629.7)
Debt Securities, Held-to-maturity, Allowance for Credit Loss	The following table presents the activity in the allowance for credit losses related to available-for-sale investment securities: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 2.6 $ — $ — $ — (Reversal of) provision for credit losses (1.2) — 1.4 — Ending balance $ 1.4 $ — $ 1.4 $ — The following table presents the activity in the allowance for credit losses related to held-to-maturity investment securities: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 0.7 $ 1.6 $ 1.9 $ — (Reversal of) provision for credit loss losses — — (1.2) 1.6 Ending balance $ 0.7 $ 1.6 $ 0.7 $ 1.6
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: June 30, 2023 AAA AA A BBB BB Not Rated Total U.S. Treasury notes $ 397.8 $ — $ — $ — $ — $ — $ 397.8 State, county, and municipal securities 69.1 92.6 10.6 — — 8.2 180.5 Obligations of U.S. government agencies 353.1 — — — — — 353.1 U.S. agency commercial mortgage-backed securities FNMA/FHLMC 361.9 — — — — — 361.9 GNMA 155.9 — — — — — 155.9 U.S. agency residential mortgage-backed securities FNMA/FHLMC 1,265.8 — — — — — 1,265.8 GNMA 45.6 — — — — — 45.6 Collateralized mortgage obligations FNMA/FHLMC 352.2 — — — — — 352.2 GNMA 148.5 — — — — — 148.5 Corporate securities — — — 52.1 — 5.0 57.1 Total $ 3,149.9 $ 92.6 $ 10.6 $ 52.1 $ — $ 13.2 $ 3,318.4 December 31, 2022 AAA AA A BBB BB Not Rated Total U.S. Treasury notes $ 396.6 $ — $ — $ — $ — $ — $ 396.6 State, county, and municipal securities 68.3 92.8 11.5 — — 8.6 181.2 Obligations of U.S. government agencies 351.7 — — — — — 351.7 U.S. agency commercial mortgage-backed securities FNMA/FHLMC 364.9 — — — — — 364.9 GNMA 161.9 — — — — — 161.9 U.S. agency residential mortgage-backed securities FNMA/FHLMC 1,342.9 — — — — — 1,342.9 GNMA 48.6 — — — — — 48.6 Collateralized mortgage obligations FNMA/FHLMC 525.8 — — — — — 525.8 Corporate securities — — — 65.1 10.0 5.0 80.1 Other securities — — — — — — — Total $ 3,260.7 $ 92.8 $ 11.5 $ 65.1 $ 10.0 $ 13.6 $ 3,453.7
Maturities of Investment Securities	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 June 30, 2023 Amortized Estimated Amortized Estimated Within one year $ 0.5 $ 0.5 $ 308.1 $ 301.7 After one year but within five years 814.4 761.3 346.6 322.9 After five years but within ten years 1,655.7 1,472.1 654.3 567.9 After ten years 3,979.0 3,624.0 2,009.4 1,732.2 Total $ 6,449.6 $ 5,857.9 $ 3,318.4 $ 2,924.7

Loans Held for Sale (Tables)

Loans Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2023
Loans Held for Sale [Abstract]
Loans Held For Sale (Table)	The following table presents loans held for sale by portfolio segment for the dates indicated: June 30, December 31, Loans held for sale: Agricultural 1 $ 59.1 $ 62.5 Commercial construction, at lower of cost or market 6.4 10.5 Residential mortgage, at fair value 11.0 6.9 Total loans held for sale $ 76.5 $ 79.9
Non-Residential Loans Held for Sale	The table below presents the non-residential mortgage loans held for sale activity for the 2023 period: Agricultural Commercial Construction Land Acquisition and Development Beginning balance $ 62.5 $ 10.5 $ — Loans held for investment transferred to loans held for sale — — 3.1 Repayments and discounted pay-offs (5.6) — (3.1) Increase (decrease) in estimated fair value of the loans 1 2.2 (4.1) — Ending balance $ 59.1 $ 6.4 $ — 1

Loans Held for Investment (Tabl

Loans Held for Investment (Tables)	6 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Schedule of Loans by Class	The following table presents loans by class of receivable and portfolio segment as of the dates indicated: June 30, December 31, Real estate: Commercial $ 8,813.9 $ 8,528.6 Construction 1,836.5 1,944.4 Residential 2,198.3 2,188.3 Agricultural 755.7 794.9 Total real estate 13,604.4 13,456.2 Consumer: Indirect 764.1 829.7 Direct and advance lines 144.0 152.9 Credit card 72.1 75.9 Total consumer 980.2 1,058.5 Commercial 3,002.7 2,882.6 Agricultural 688.0 708.3 Other, including overdrafts 1.7 9.2 Loans held for investment 18,277.0 18,114.8 Deferred loan fees and costs (13.6) (15.6) Loans held for investment, net of deferred fees and costs 18,263.4 18,099.2 Allowance for credit losses (224.6) (220.1) Net loans held for investment $ 18,038.8 $ 17,879.1
Schedule of Allowance for Loan Losses by Portfolio Segment	The following tables represent, by loan portfolio segments, the activity in the allowance for credit losses for loans held for investment: Three Months Ended June 30, 2023 Beginning Balance Provision for (reversal of) Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate $ 147.5 $ 20.4 $ (10.0) $ 0.8 $ 158.7 Consumer 21.8 (6.2) (3.3) 1.4 13.7 Commercial 54.4 (4.5) (0.8) 0.4 49.5 Agricultural 2.4 0.2 — 0.1 2.7 Total allowance for credit losses $ 226.1 $ 9.9 $ (14.1) $ 2.7 $ 224.6 Six Months Ended June 30, 2023 Beginning Balance Provision for Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate $ 138.7 $ 33.8 $ (14.8) $ 1.0 $ 158.7 Consumer 23.3 (5.5) (6.7) 2.6 13.7 Commercial 54.9 (5.3) (1.5) 1.4 49.5 Agricultural 3.2 (0.9) — 0.4 2.7 Total allowance for credit losses $ 220.1 $ 22.1 $ (23.0) $ 5.4 $ 224.6 Three Months Ended June 30, 2022 Beginning Balance ACL for (reduction on) PCD Loans Provision for (reversal of) Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate: Commercial real estate: Non-owner occupied $ 45.2 $ (6.9) $ (8.8) $ — $ — $ 29.5 Owner occupied 25.2 — 1.4 — — 26.6 Multi-family 54.6 (19.0) (2.9) — 0.7 33.4 Total commercial real estate 125.0 (25.9) (10.3) — 0.7 89.5 Construction: Land acquisition & development 0.5 — 0.2 — 0.1 0.8 Residential construction 3.3 — 0.1 — — 3.4 Commercial construction 10.2 — 4.7 — — 14.9 Total construction 14.0 — 5.0 — 0.1 19.1 Residential real estate: Residential 1-4 family 18.7 — (0.7) — 0.2 18.2 Home equity and HELOC 1.4 — (0.1) — 0.2 1.5 Total residential real estate 20.1 — (0.8) — 0.4 19.7 Agricultural real estate 10.5 — (5.1) (0.1) 0.1 5.4 Total real estate 169.6 (25.9) (11.2) (0.1) 1.3 133.7 Consumer: Indirect 13.5 — (0.4) (0.8) 0.8 13.1 Direct and advance lines 4.6 — 0.5 (0.6) 0.5 5.0 Credit card 2.3 — 0.7 (0.9) 0.1 2.2 Total consumer 20.4 — 0.8 (2.3) 1.4 20.3 Commercial: Commercial and floor plans 52.9 — 1.9 (1.1) 0.4 54.1 Commercial purpose secured by 1-4 family 5.0 — 0.4 — 0.1 5.5 Credit card 0.3 — 0.1 (0.1) — 0.3 Total commercial 58.2 — 2.4 (1.2) 0.5 59.9 Agricultural: Agricultural (1.0) 1.1 6.3 (0.1) 0.2 6.5 Total agricultural (1.0) 1.1 6.3 (0.1) 0.2 6.5 Total allowance for credit losses $ 247.2 $ (24.8) $ (1.7) $ (3.7) $ 3.4 $ 220.4 Six Months Ended June 30, 2022 Beginning Balance ACL for PCD Loans Provision for Credit Losses Loans Charged-Off (2) Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate: Commercial real estate: Non-owner occupied $ 17.3 $ 17.2 $ (2.1) $ (2.9) $ — $ 29.5 Owner occupied 13.3 9.5 6.0 (2.2) — 26.6 Multi-family 13.3 10.9 8.5 — 0.7 33.4 Total commercial real estate 43.9 37.6 12.4 (5.1) 0.7 89.5 Construction: Land acquisition & development 0.5 3.4 (0.6) (2.7) 0.2 0.8 Residential construction 2.4 — 1.0 — — 3.4 Commercial construction 6.0 0.2 8.7 — — 14.9 Total construction 8.9 3.6 9.1 (2.7) 0.2 19.1 Residential real estate: Residential 1-4 family 13.4 0.1 4.5 (0.1) 0.3 18.2 Home equity and HELOC 1.2 — — — 0.3 1.5 Total residential real estate 14.6 0.1 4.5 (0.1) 0.6 19.7 Agricultural real estate 1.9 2.3 1.3 (0.2) 0.1 5.4 Total real estate 69.3 43.6 27.3 (8.1) 1.6 133.7 Consumer: Indirect 14.3 — (0.7) (1.7) 1.2 13.1 Direct and advance lines 4.6 — 0.4 (1.4) 1.4 5.0 Credit card 2.2 — 1.3 (1.5) 0.2 2.2 Total consumer 21.1 — 1.0 (4.6) 2.8 20.3 Commercial: Commercial and floor plans 27.1 11.2 20.3 (5.3) 0.8 54.1 Commercial purpose secured by 1-4 family 4.4 0.2 0.8 — 0.1 5.5 Credit card 0.1 — 0.4 (0.2) — 0.3 Commercial 31.6 11.4 21.5 (5.5) 0.9 59.9 Agricultural: Agricultural 0.3 4.5 5.8 (5.4) 1.3 6.5 Total agricultural 0.3 4.5 5.8 (5.4) 1.3 6.5 Total allowance for credit losses $ 122.3 $ 59.5 $ 55.6 $ (23.6) $ 6.6 $ 220.4 (1) Amounts presented exclude the allowance for credit losses related to unfunded commitments and investment securities. The allowance for credit losses related to unfunded commitments and investment securities are included in the “Financial Instruments with Off-Balance Sheet Risk” Note and “Investment Securities” Note, respectively. (2) 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.
Schedule of Recorded Investment in Impaired Loans	The following tables present the principal balance of collateral-dependent loans by class of receivable as of the dates indicated: Collateral Type As of June 30, 2023 Business Assets Real Property Total Real estate: Commercial $ 1.6 $ 32.3 $ 33.9 Construction — 17.8 17.8 Residential — 0.5 0.5 Agricultural — 3.7 3.7 Total real estate 1.6 54.3 55.9 Commercial 1.4 5.5 6.9 Agricultural 0.2 0.5 0.7 Total collateral-dependent loans $ 3.2 $ 60.3 $ 63.5 Collateral Type As of December 31, 2022 Business Assets Real Property Total Real estate: Commercial $ 1.7 $ 15.8 $ 17.5 Construction — 3.2 3.2 Residential — 0.5 0.5 Agricultural 0.2 5.8 6.0 Total real estate 1.9 25.3 27.2 Commercial 3.1 1.5 4.6 Agricultural 2.1 5.2 7.3 Total collateral-dependent loans $ 7.1 $ 32.0 $ 39.1
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 90 days or more past due continue to accrue interest. The following tables present the contractual aging of the Company’s recorded principal balance of loans by class of receivable as of the dates indicated: Total Loans 30 - 59 60 - 89 90 or more 30 or More Days Days Days Days Current Non-accrual Total As of June 30, 2023 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate: Commercial $ 4.1 $ 0.1 $ — $ 4.2 $ 8,774.3 $ 35.4 $ 8,813.9 Construction 8.2 3.0 3.3 14.5 1,803.8 18.2 1,836.5 Residential 1.2 2.1 0.6 3.9 2,186.7 7.7 2,198.3 Agricultural 7.8 3.9 0.3 12.0 736.9 6.8 755.7 Total real estate 21.3 9.1 4.2 34.6 13,501.7 68.1 13,604.4 Consumer: Indirect 6.5 2.1 0.5 9.1 752.1 2.9 764.1 Direct 0.6 0.5 0.1 1.2 142.6 0.2 144.0 Credit card 0.7 0.4 0.4 1.5 70.6 — 72.1 Total consumer 7.8 3.0 1.0 11.8 965.3 3.1 980.2 Commercial 4.6 2.3 1.1 8.0 2,982.6 12.1 3,002.7 Agricultural 1.3 0.1 0.4 1.8 683.4 2.8 688.0 Other, including overdrafts — — — — 1.7 — 1.7 Loans held for investment $ 35.0 $ 14.5 $ 6.7 $ 56.2 $ 18,134.7 $ 86.1 $ 18,277.0 Total Loans 30 - 59 60 - 89 90 or more 30 or More Days Days Days Days Current Non-accrual Total As of December 31, 2022 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate: Commercial $ 5.6 $ 0.8 $ 1.1 $ 7.5 $ 8,501.5 $ 19.6 $ 8,528.6 Construction 10.4 0.6 0.6 11.6 1,929.1 3.7 1,944.4 Residential 9.9 2.1 1.2 13.2 2,168.7 6.4 2,188.3 Agricultural 1.1 6.1 — 7.2 780.1 7.6 794.9 Total real estate 27.0 9.6 2.9 39.5 13,379.4 37.3 13,456.2 Consumer: Indirect 9.3 2.4 0.6 12.3 814.7 2.7 829.7 Direct 0.8 0.3 0.1 1.2 151.4 0.3 152.9 Credit card 0.8 0.4 0.6 1.8 74.1 — 75.9 Total consumer 10.9 3.1 1.3 15.3 1,040.2 3.0 1,058.5 Commercial 7.1 1.7 2.1 10.9 2,861.5 10.2 2,882.6 Agricultural 0.8 2.2 0.1 3.1 696.5 8.7 708.3 Other, including overdrafts — — — — 9.2 — 9.2 Loans held for investment $ 45.8 $ 16.6 $ 6.4 $ 68.8 $ 17,986.8 $ 59.2 $ 18,114.8 (1) As of June 30, 2023 and December 31, 2022, none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three and the six months ended June 30, 2023 and 2022, respectively. There were no material reversals of accrued interest during the same periods.
Financing Receivable, Excluding Accrued Interest, Modified Period	The following table presents the amortized cost basis of loans at June 30, 2023 that were both experiencing financial difficulty and modified during the three and the six month periods ended June 30, 2023, by class and by type of modification. The percentage of the principal balance of loans that were modified to borrowers in financial distress as compared to the principal balance of each class of receivable is also presented below: Three Months Ended June 30, 2023 Principal Forgiveness Term Extension Total % of Total Class of Loans Held for Investment (1) Real estate: Commercial $ — $ 13.9 $ 13.9 0.16 % Residential — 0.1 0.1 — Total real estate — 14.0 14.0 0.10 Commercial — 6.4 6.4 0.21 Agricultural — 19.6 19.6 2.85 Loans held for investment (2) $ — $ 40.0 $ 40.0 0.22 % Six Months Ended June 30, 2023 Real estate: Commercial $ 1.6 $ 17.4 $ 19.0 0.22 % Construction — 0.1 0.1 0.01 Residential 0.1 0.2 0.3 0.01 Agricultural — 1.1 1.1 0.15 Total real estate 1.7 18.8 20.5 0.15 Commercial — 8.8 8.8 0.29 Agricultural — 36.6 36.6 5.32 Loans held for investment (2) $ 1.7 $ 64.2 $ 65.9 0.36 % (1) Based on the principal balance as of period end, divided by the period end principal balance of the corresponding class of receivables. (2) As of June 30, 2023, the Company excluded $0.9 million in accrued interest from the amortized cost of the identified loans.
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 February 1, 2022, or the date of the acquisition, with the purchase price (or initial fair value of the loans) as amended for measurement period adjustments: Purchase price (initial fair value) $ 623.3 Allowance for credit losses (1) 298.2 Discount attributable to other factors (2) 57.7 Par value (unpaid principal balance) $ 979.2 (1) For acquired PCD loans, an allowance of $298.2 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 $59.5 million. (2) Non-credit discount includes the difference between the amortized cost basis and the unpaid principal balance of $39.6 million established on PCD loans acquired from GWB and interest applied to principal of $18.1 million.
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 losses of the following class of receivables based on the aforementioned risk scale as of and for the periods ended: As of and for the six months ended June 30, 2023 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted To Term Total Commercial real estate: Pass $ 633.8 $ 2,250.0 $ 1,728.7 $ 1,302.0 $ 752.4 $ 1,784.9 $ 32.0 $ 55.0 $ 8,538.8 Special mention 4.0 9.3 20.1 5.8 25.5 69.1 1.8 — 135.6 Substandard 3.0 26.5 28.4 9.6 29.2 30.1 0.4 0.3 127.5 Doubtful 10.6 — 1.4 — — — — — 12.0 Total $ 651.4 $ 2,285.8 $ 1,778.6 $ 1,317.4 $ 807.1 $ 1,884.1 $ 34.2 $ 55.3 $ 8,813.9 Current-period gross charge-offs — 0.3 1.7 2.6 — — — — 4.6 Construction real estate: Pass $ 237.6 $ 822.7 $ 502.2 $ 49.6 $ 17.8 $ 40.0 $ 96.2 $ 13.6 $ 1,779.7 Special mention — 8.6 0.1 — 2.7 0.2 — 3.0 14.6 Substandard — 3.0 24.5 0.2 0.1 0.5 — — 28.3 Doubtful — 13.9 — — — — — — 13.9 Total $ 237.6 $ 848.2 $ 526.8 $ 49.8 $ 20.6 $ 40.7 $ 96.2 $ 16.6 $ 1,836.5 Current-period gross charge-offs — — 0.1 — — — — 9.6 9.7 Agricultural real estate: Pass $ 35.9 $ 143.1 $ 163.0 $ 102.9 $ 60.7 $ 143.3 $ 28.8 $ 0.4 $ 678.1 Special mention 2.6 0.8 1.2 2.0 1.7 12.6 8.9 — 29.8 Substandard 8.0 20.7 4.8 1.2 0.5 11.6 — — 46.8 Doubtful — — — 1.0 — — — — 1.0 Total $ 46.5 $ 164.6 $ 169.0 $ 107.1 $ 62.9 $ 167.5 $ 37.7 $ 0.4 $ 755.7 Current-period gross charge-offs — — — — — — — — — Commercial: Pass $ 289.2 $ 577.9 $ 422.6 $ 247.1 $ 127.0 $ 344.7 $ 811.6 $ 36.1 $ 2,856.2 Special mention 0.9 4.2 10.5 4.2 2.3 1.5 11.0 0.1 34.7 Substandard 4.0 21.9 8.4 3.1 4.7 5.9 58.3 — 106.3 Doubtful 4.2 — 1.2 — — — 0.1 — 5.5 Total $ 298.3 $ 604.0 $ 442.7 $ 254.4 $ 134.0 $ 352.1 $ 881.0 $ 36.2 $ 3,002.7 Current-period gross charge-offs — 0.3 0.1 0.2 0.1 — 0.8 — 1.5 Agricultural: Pass $ 50.9 $ 92.8 $ 48.3 $ 26.3 $ 8.3 $ 10.8 $ 375.9 $ 1.4 $ 614.7 Special mention 0.8 1.0 0.7 0.3 0.2 0.2 2.9 0.2 6.3 Substandard 44.5 1.1 1.0 1.4 0.5 1.3 16.6 0.2 66.6 Doubtful — — 0.4 — — — — — 0.4 Total $ 96.2 $ 94.9 $ 50.4 $ 28.0 $ 9.0 $ 12.3 $ 395.4 $ 1.8 $ 688.0 Current-period gross charge-offs — — — — — — — — — December 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 $ 1,162.6 $ 861.3 $ 661.1 $ 467.6 $ 241.5 $ 890.4 $ 29.2 $ 4,313.7 Special mention 1.0 6.8 2.3 4.6 — 7.4 — 22.1 Substandard 0.1 13.9 10.8 18.2 19.6 9.8 — 72.4 Total $ 1,163.7 $ 882.0 $ 674.2 $ 490.4 $ 261.1 $ 907.6 $ 29.2 $ 4,408.2 Commercial real estate owner occupied: Pass $ 793.0 $ 718.7 $ 533.9 $ 266.3 $ 165.8 $ 551.3 $ 18.2 $ 3,047.2 Special mention 10.9 14.2 12.3 6.1 5.6 5.5 1.1 55.7 Substandard 8.4 3.0 2.3 8.9 8.5 17.2 0.5 48.8 Doubtful 0.4 1.4 — — — — — 1.8 Total $ 812.7 $ 737.3 $ 548.5 $ 281.3 $ 179.9 $ 574.0 $ 19.8 $ 3,153.5 Commercial multi-family: Pass $ 369.2 $ 204.9 $ 189.0 $ 52.1 $ 35.0 $ 113.7 $ 1.0 $ 964.9 Special mention — — — — — 1.7 — 1.7 Substandard — — — — — 0.3 — 0.3 Total $ 369.2 $ 204.9 $ 189.0 $ 52.1 $ 35.0 $ 115.7 $ 1.0 $ 966.9 Land, acquisition and development: Pass $ 152.5 $ 114.4 $ 29.5 $ 17.0 $ 10.9 $ 28.4 $ 22.2 $ 374.9 Special mention 6.7 — — — 0.2 0.3 — 7.2 Substandard — 0.3 0.2 — — 0.4 — 0.9 Doubtful — 3.2 — — — — — 3.2 Total $ 159.2 $ 117.9 $ 29.7 $ 17.0 $ 11.1 $ 29.1 $ 22.2 $ 386.2 Residential construction: Pass $ 118.4 $ 119.9 $ 0.4 $ 0.3 $ 0.4 $ 5.8 $ 270.1 $ 515.3 Substandard — 0.5 — — — 0.4 — 0.9 Total $ 118.4 $ 120.4 $ 0.4 $ 0.3 $ 0.4 $ 6.2 $ 270.1 $ 516.2 Commercial construction: Pass $ 442.7 $ 374.8 $ 89.7 $ 45.9 $ 0.4 $ — $ 10.6 $ 964.1 Special mention 2.3 — 23.1 — — — 11.3 36.7 Substandard 16.8 24.4 — — — — — 41.2 Total $ 461.8 $ 399.2 $ 112.8 $ 45.9 $ 0.4 $ — $ 21.9 $ 1,042.0 Agricultural real estate: Pass $ 180.0 $ 172.8 $ 109.5 $ 64.8 $ 46.6 $ 105.1 $ 31.4 $ 710.2 Special mention 22.4 0.7 1.2 2.6 10.0 3.2 11.0 51.1 Substandard 1.8 12.3 3.5 0.6 2.7 11.3 0.1 32.3 Doubtful — — 1.3 — — — — 1.3 Total $ 204.2 $ 185.8 $ 115.5 $ 68.0 $ 59.3 $ 119.6 $ 42.5 $ 794.9 Commercial and floor plans: Pass $ 501.7 $ 358.9 $ 214.4 $ 124.3 $ 120.3 $ 171.1 $ 631.6 $ 2,122.3 Special mention 15.9 6.8 1.3 4.4 0.9 4.9 18.5 52.7 Substandard 9.8 3.3 3.7 3.4 3.2 2.1 47.2 72.7 Doubtful 0.3 1.3 — — — — 0.1 1.7 Total $ 527.7 $ 370.3 $ 219.4 $ 132.1 $ 124.4 $ 178.1 $ 697.4 $ 2,249.4 December 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 purpose secured by 1-4 family: Pass $ 191.7 $ 134.5 $ 69.8 $ 30.4 $ 29.9 $ 39.5 $ 28.9 $ 524.7 Special mention 0.1 1.2 2.1 0.2 1.4 0.2 — 5.2 Substandard 0.2 0.3 0.1 0.3 0.9 1.2 — 3.0 Total $ 192.0 $ 136.0 $ 72.0 $ 30.9 $ 32.2 $ 40.9 $ 28.9 $ 532.9 Agricultural: Pass $ 127.2 $ 59.7 $ 31.8 $ 10.6 $ 8.6 $ 3.1 $ 375.1 $ 616.1 Special mention 26.1 2.8 0.4 1.0 0.3 — 26.2 56.8 Substandard 22.8 4.6 2.8 0.6 1.2 0.2 0.8 33.0 Doubtful — 0.5 — — — — — 0.5 Total $ 176.1 $ 67.6 $ 35.0 $ 12.2 $ 10.1 $ 3.3 $ 402.1 $ 706.4 As of and for the six months ended June 30, 2023 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2023 2022 2021 2020 2019 Prior Revolving Loans Amortized Cost Basis Revolving Loans Converted To Term Total Residential: Performing $ 33.4 $ 299.5 $ 507.7 $ 523.0 $ 96.9 $ 240.4 $ 476.6 $ 12.5 $ 2,190.0 Nonperforming 0.1 0.9 0.8 0.6 0.7 5.0 0.2 — 8.3 Total $ 33.5 $ 300.4 $ 508.5 $ 523.6 $ 97.6 $ 245.4 $ 476.8 $ 12.5 $ 2,198.3 Current-period gross charge-offs 0.3 — — 0.1 — 0.1 — — 0.5 Consumer indirect: Performing $ 86.7 $ 321.2 $ 142.8 $ 103.6 $ 44.7 $ 61.6 $ — $ — $ 760.6 Nonperforming 0.1 1.3 0.8 0.4 0.2 0.5 — — 3.3 Total $ 86.8 $ 322.5 $ 143.6 $ 104.1 $ 44.9 $ 62.2 $ — $ — $ 764.1 Current-period gross charge-offs — 1.3 1.2 0.5 0.1 0.3 — — 3.4 Consumer direct and advance line: Performing $ 23.9 $ 41.4 $ 24.2 $ 12.8 $ 5.4 $ 8.3 $ 27.4 $ 0.3 $ 143.7 Nonperforming — 0.1 0.1 — — 0.1 — — 0.3 Total $ 23.9 $ 41.5 $ 24.3 $ 12.8 $ 5.4 $ 8.4 $ 27.4 $ 0.3 $ 144.0 Current-period gross charge-offs — 0.1 0.1 0.1 0.1 1.4 0.1 — 1.9 Consumer credit card: Performing $ — $ — $ — $ — $ — $ — $ 71.6 $ — $ 71.6 Nonperforming — — — — — — 0.5 — 0.5 Total $ — $ — $ — $ — $ — $ — $ 72.1 $ — $ 72.1 Current-period gross charge-offs — — — — — — 1.4 — 1.4 December 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 $ 258.9 $ 490.3 $ 541.6 $ 98.0 $ 32.0 $ 213.8 $ — $ 1,634.6 Nonperforming — 0.2 0.1 0.5 0.3 3.7 — 4.8 Total $ 258.9 $ 490.5 $ 541.7 $ 98.5 $ 32.3 $ 217.5 $ — $ 1,639.4 Consumer home equity and HELOC: Performing $ 23.8 $ 8.0 $ 5.2 $ 5.5 $ 5.6 $ 15.2 $ 482.8 $ 546.1 Nonperforming 0.6 0.3 0.2 0.2 0.1 1.2 0.2 2.8 Total $ 24.4 $ 8.3 $ 5.4 $ 5.7 $ 5.7 $ 16.4 $ 483.0 $ 548.9 Consumer indirect: Performing $ 380.3 $ 176.4 $ 130.0 $ 59.7 $ 33.6 $ 46.3 $ — $ 826.3 Nonperforming 1.0 0.9 0.6 0.3 0.2 0.4 — 3.4 Total $ 381.3 $ 177.3 $ 130.6 $ 60.0 $ 33.8 $ 46.7 $ — $ 829.7 Consumer direct and advance line: Performing $ 52.6 $ 31.9 $ 18.2 $ 8.5 $ 6.5 $ 8.9 $ 25.8 $ 152.4 Nonperforming 0.1 0.1 0.1 — — 0.1 0.1 0.5 Total $ 52.7 $ 32.0 $ 18.3 $ 8.5 $ 6.5 $ 9.0 $ 25.9 $ 152.9 As of December 31, 2022 Consumer Commercial Agricultural Total Credit Card: Performing $ 75.4 $ 100.0 $ 1.9 $ 177.3 Nonperforming 0.5 0.3 — 0.8 Total credit card $ 75.9 $ 100.3 $ 1.9 $ 178.1
Financial Receivable, Excluding Accrued Interest, Modified Period, Financial Difficulty	The following table presents the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty during the three and the six month periods ended June 30, 2023: Three Months Ended June 30, 2023 Principal Forgiveness Weighted-Average Months of Term Extension Real estate: Commercial $ — 6.4 Residential — 16.2 Total real estate — Consumer: Indirect — 7.0 Direct and advance lines — 8.0 Total consumer — Commercial — 8.3 Agricultural — 8.9 Loans held for investment (1) $ — Six Months Ended June 30, 2023 Real estate: Commercial $ 1.3 6.4 Construction — 12.4 Residential 0.3 19.5 Agricultural — 7.2 Total real estate 1.6 Consumer: Indirect — 8.3 Direct and advance lines — 8.0 Total consumer — Commercial — 9.0 Agricultural — 9.2 Loans held for investment (1) $ 1.6 (1) Balances based on loan original contractual terms.

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	6 Months Ended
	Jun. 30, 2023
Repossessed Assets [Abstract]
Other Real Estate Owned Roll Forward	Other real estate owned (“OREO”) 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 OREO is reflected in the following table: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 13.4 $ 17.5 $ 12.7 $ 2.0 Acquired through acquisition — — — 15.8 Additions 1.7 0.1 2.5 0.1 Valuation adjustments (0.7) — (0.8) — Dispositions — (0.8) — (1.1) Ending balance $ 14.4 $ 16.8 $ 14.4 $ 16.8

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following amounts were recorded on the consolidated balance sheets related to cumulative basis adjustment for fair value hedges for the periods indicated: June 30, 2023 December 31, 2022 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 $ 192.6 $ 7.4 $ 191.9 $ 8.1
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	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 consolidated balance sheets. June 30, 2023 December 31, 2022 Notional Amount Consolidated Balance Sheet Location Estimated Notional Amount Consolidated Balance Sheet Location Estimated Derivatives designated as accounting hedges: Interest rate swap contracts $ — $ — $ 550.0 $ 3.5 Derivatives not designated as accounting hedges: Interest rate swap contracts 1,645.7 40.2 1,728.1 41.6 Forward loan sales contracts 13.4 — 12.6 0.1 Derivative assets $ 1,659.1 Other assets $ 40.2 $ 2,290.7 Other assets $ 45.2 Derivatives designated as accounting hedges: Interest rate collars $ 300.0 $ 7.0 $ 300.0 $ 5.4 Interest rate swap contracts 850.0 7.7 300.0 0.3 Derivatives not designated as accounting hedges: Interest rate swap contracts 1,645.7 148.3 1,728.1 153.9 Risk participation agreements 103.7 — 106.1 — Interest rate lock commitments 15.1 0.1 14.8 — Derivative liabilities $ 2,914.5 Accounts payable and accrued expenses $ 163.1 $ 2,449.0 Accounts payable and accrued expenses $ 159.6
Derivatives Not Designated as Hedging Instruments	The table below presents the effect of the Company’s derivative financial instruments that are not designated as hedging instruments on the consolidated statements of income for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 Location of Gain Recognized in Income on Derivative Amount of Gain Recognized in Income on Derivative Location of Gain Recognized in Income on Derivative Amount of Gain Recognized in Income on Derivative Interest rate lock commitments Mortgage banking revenues $ 0.2 $ 1.0 Mortgage banking revenues $ 0.2 $ 1.5
Schedule of Derivative Instruments	The tables below present the gross presentation, the effects of offsetting, and a net presentation of the Company’s derivatives as of the dates indicated: June 30, 2023 Gross Assets Recognized Gross Assets Offset in the Balance Sheet Net Assets in the Balance Sheet Financial Instruments Cash Collateral Received (1) Net Amount Interest rate swap contracts $ 40.2 $ — $ 40.2 $ — $ 36.4 $ 3.8 Total derivatives 40.2 — 40.2 — 36.4 3.8 Total assets $ 40.2 $ — $ 40.2 $ — $ 36.4 $ 3.8 (1) Netting adjustments represent the amounts recorded to convert derivatives assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The application of the collateral cannot reduce the net derivative position below zero. Therefore, excess collateral, if any, is not reflected above. 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 and collar contracts $ 163.0 $ — $ 163.0 $ — $ — $ 163.0 Interest rate lock commitments 0.1 — 0.1 — — 0.1 Total derivatives 163.1 — 163.1 — — 163.1 Repurchase agreements 929.9 — 929.9 — 929.9 — Total liabilities $ 1,093.0 $ — $ 1,093.0 $ — $ 929.9 $ 163.1 December 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 $ 45.1 $ — $ 45.1 $ — $ 45.1 $ — Mortgage related derivatives 0.1 — 0.1 — — 0.1 Total derivatives 45.2 — 45.2 — 45.1 0.1 Total assets $ 45.2 $ — $ 45.2 $ — $ 45.1 $ 0.1 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 $ 159.6 $ — $ 159.6 $ — $ — $ 159.6 Total derivatives 159.6 — 159.6 — — 159.6 Repurchase agreements 1,052.9 — 1,052.9 — 1,052.9 — Total liabilities $ 1,212.5 $ — $ 1,212.5 $ — $ 1,052.9 $ 159.6

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2023
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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 Net income $ 67.0 $ 64.1 $ 123.3 $ 30.7 Weighted average common shares outstanding for basic earnings per share computation 103,820,649 109,106,891 103,779,386 101,025,926 Dilutive effects of stock-based compensation 2,242 24,827 42,539 50,405 Weighted average common shares outstanding for diluted earnings per common share computation 103,822,891 109,131,718 103,821,925 101,076,331 Basic earnings per common share $ 0.65 $ 0.59 $ 1.19 $ 0.30 Diluted earnings per common share $ 0.65 $ 0.59 $ 1.19 $ 0.30 Anti-dilutive unvested time restricted stock 222,417 218,033 129,449 61,058

Regulatory Capital (Tables)

Regulatory Capital (Tables)	6 Months Ended
	Jun. 30, 2023
Banking and Thrift, Other Disclosure [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 June 30, 2023 and December 31, 2022 are presented in the following tables: Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer (1) Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements (2) June 30, 2023 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 2,925.7 12.90 % $ 1,815.1 8.00 % $ 2,382.3 10.50 % $ 2,268.9 10.00 % FIB 2,759.2 12.18 1,812.7 8.00 2,379.2 10.50 2,265.9 10.00 Tier 1 risk-based capital: Consolidated 2,440.5 10.76 1,361.3 6.00 1,928.5 8.50 1,815.1 8.00 FIB 2,530.9 11.17 1,359.6 6.00 1,926.0 8.50 1,812.7 8.00 Common equity tier 1 risk-based capital: Consolidated 2,440.5 10.76 1,021.0 4.50 1,588.2 7.00 1,474.8 6.50 FIB 2,530.9 11.17 1,019.7 4.50 1,586.1 7.00 1,472.9 6.50 Leverage capital ratio: Consolidated 2,440.5 7.99 1,222.3 4.00 1,222.3 4.00 1,527.8 5.00 FIB 2,530.9 8.29 1,220.6 4.00 1,220.6 4.00 1,525.8 5.00 Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer (1) Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements (2) December 31, 2022 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 2,875.8 12.48 % $ 1,843.2 8.00 % $ 2,419.2 10.50 % $ 2,304.0 10.00 % FIB 2,713.5 11.80 1,839.6 8.00 2,414.5 10.50 2,299.5 10.00 Tier 1 risk-based capital: Consolidated 2,408.8 10.45 1,382.4 6.00 1,958.4 8.50 1,843.2 8.00 FIB 2,504.1 10.89 1,379.7 6.00 1,954.6 8.50 1,839.6 8.00 Common equity tier 1 risk-based capital: Consolidated 2,408.8 10.45 1,036.8 4.50 1,612.8 7.00 1,497.6 6.50 FIB 2,504.1 10.89 1,034.8 4.50 1,609.7 7.00 1,494.7 6.50 Leverage capital ratio: Consolidated 2,408.8 7.75 1,242.9 4.00 1,242.9 4.00 1,553.6 5.00 FIB 2,504.1 8.07 1,241.1 4.00 1,241.1 4.00 1,551.4 5.00 (1) The capital conservation buffer is an additional 2.5% of the amount necessary to meet the minimum risk-based capital requirements for total, tier 1, and common equity tier 1 risk-based capital. (2) 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.

Comprehensive Text Block List (

Comprehensive Text Block List (Tables)	6 Months Ended
	Jun. 30, 2023
Text Block [Abstract]
financial instruments with off-balance sheet risk	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 June 30, Six Months Ended June 30, 2023 2022 2023 2022 Beginning balance $ 17.8 $ 6.2 $ 16.2 $ 3.8 Provision for credit loss expense 3.0 — 4.6 2.4 Ending balance $ 20.8 $ 6.2 $ 20.8 $ 6.2 June 30, 2023 December 31, 2022 Unused credit card lines $ 809.7 $ 827.6 Commitments to extend credit 4,711.7 5,173.3 Standby letters of credit 96.7 93.8

Other Comprehensive Income_Lo_2

Other Comprehensive Income/Loss (Tables)	6 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Schedule of Other Comprehensive Income and Related Tax Effects	The gross amounts of each component of other comprehensive income (loss) and the related tax effects are as follows: Pre-tax Tax Expense (Benefit) Net of Tax Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Investment securities available-for sale: Change in net unrealized gains (losses) during the period $ (57.5) $ (161.6) $ (14.4) $ (45.2) $ (43.1) $ (116.4) Reclassification adjustment for net losses included in income 0.1 0.1 — — 0.1 0.1 Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity (0.4) (0.9) (0.1) (0.2) (0.3) (0.7) Change in net unrealized loss on derivatives (22.1) (15.0) (5.5) (4.2) (16.6) (10.8) Total other comprehensive income (loss) $ (79.9) $ (177.4) $ (20.0) $ (49.6) $ (59.9) $ (127.8) Pre-tax Tax Expense (Benefit) Net of Tax Six Months Ended June 30, 2023 2022 2023 2022 2023 2022 Investment securities available-for sale: Change in net unrealized loss during period $ 20.7 $ (414.2) $ 5.2 $ (107.9) $ 15.5 $ (306.3) Reclassification adjustment for net loss (gain) included in net income 23.5 0.2 5.8 — 17.7 0.2 Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale (7.2) 0.2 (1.8) 0.1 (5.4) 0.1 Net change in unamortized (gains) losses on available-for-sale securities transferred into held-to-maturity (0.8) (23.9) (0.2) (5.9) (0.6) (18.0) Change in net unrealized gain (loss) on derivatives (12.1) 6.3 (3.0) 1.1 (9.1) 5.2 Total other comprehensive loss $ 24.1 $ (431.4) $ 6.0 $ (112.6) $ 18.1 $ (318.8)
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive loss, net of related tax effects, are as follows: June 30, 2023 December 31, 2022 Net unrealized loss on investment securities available-for-sale $ (443.2) $ (471.0) Net unrealized loss on investment securities transferred to held-to-maturity (5.2) (4.5) Net unrealized loss on derivatives (10.6) (1.6) Net accumulated other comprehensive loss $ (459.0) $ (477.1)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2023
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 June 30, 2023 Fair Value Quoted Prices in Significant Other Significant Investment debt securities available-for-sale: U.S. Treasury notes $ 219.1 $ — $ 219.1 $ — State, county, and municipal securities 214.9 — 214.9 — Obligations of U.S. government agencies 172.0 — 172.0 — U.S. agency commercial mortgage-backed securities 1,102.4 — 1,102.4 — U.S. agency residential mortgage-backed securities 1,375.4 — 1,375.4 — Collateralized mortgage obligations 1,205.2 — 1,205.2 — Private mortgage-backed securities 217.1 — 217.1 — Collateralized loan obligations 1,124.3 — 1,124.3 — Corporate securities 227.5 — 227.5 — Loans held for sale 18.4 — 11.0 7.4 Derivative assets: Interest rate swap contracts 40.2 — 40.2 — Derivative liabilities: Interest rate collars 7.0 — 7.0 — Interest rate swap contracts 156.0 — 156.0 — Interest rate lock commitments 0.1 — 0.1 — Deferred compensation plan assets 18.4 — 18.4 — Deferred compensation plan liabilities 18.4 — 18.4 — Fair Value Measurements at Reporting Date Using As of December 31, 2022 Fair Value Quoted Prices in Significant Other Significant Investment debt securities available-for-sale: U.S. Treasury notes $ 642.7 $ — $ 642.7 $ — State, county and municipal securities 263.7 — 263.7 — Obligations of U.S. government agencies 198.9 — 198.9 — U.S. agency commercial mortgage-backed securities 1,351.2 — 1,351.2 — U.S. agency residential mortgage-backed securities 1,558.3 — 1,558.3 — Collateralized mortgage obligations 1,350.2 — 1,350.2 — Private mortgage-backed securities 228.0 — 228.0 — Collateralized loan obligations 1,111.6 — 1,111.6 — Corporate securities 241.5 — 241.5 — Loans held for sale 12.4 — 6.9 5.5 Derivative assets: Interest rate swap contracts 45.1 — 45.1 — Forward loan sales contracts 0.1 — 0.1 — Derivative liabilities Interest rate collars 5.4 — 5.4 — Interest rate swap contracts 154.2 — 154.2 — Deferred compensation plan assets 18.7 — 18.7 — Deferred compensation plan liabilities 18.7 — 18.7 —
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 June 30, 2023 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Significant Collateral-dependent loans $ 63.5 $ — $ — $ 63.5 Loans held for sale 58.1 — — 58.1 Other real estate owned 14.4 — — 14.4 Long-lived assets to be disposed of by sale 4.6 — — 4.6 Fair Value Measurements at Reporting Date Using As of December 31, 2022 Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Significant Collateral-dependent loans $ 39.1 $ — $ — $ 39.1 Loans held for sale 67.5 — — 67.5 Other real estate owned 12.7 — — 12.7 Long-lived assets to be disposed of by sale 5.5 — — 5.5
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 June 30, 2023 December 31, 2022 Valuation Unobservable Range Collateral-dependent loans $ 63.5 $ 39.1 Appraisal Appraisal adjustment 0% - 45% (7%) Loans held for sale 58.1 67.5 Fair value of collateral Discount for type of property, age of appraisal, and current status 11% - 23% (17%) Other real estate owned 14.4 12.7 Appraisal Appraisal adjustment 15% - 36% (22%) Long-lived assets to be disposed of by sale 4.6 5.5 Appraisal Appraisal adjustment 0% - 6% (3%)
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 June 30, 2023 Carrying Amount Estimated Quoted Prices in Active Markets for Significant Other Significant Financial assets: Cash and cash equivalents $ 680.5 $ 680.5 $ 680.5 $ — $ — Investment debt securities available-for-sale 5,857.9 5,857.9 — 5,857.9 — Investment debt securities held-to-maturity 3,317.7 2,924.7 — 2,924.7 — Accrued interest receivable 119.1 119.1 — 119.1 — Mortgage servicing rights, net 29.8 38.2 — 38.2 — Loans held for sale 76.5 76.5 — 11.0 65.5 Net loans held for investment 18,038.8 17,519.5 — 17,456.0 63.5 Derivative assets 40.2 40.2 — 40.2 — Deferred compensation plan assets 18.4 18.4 — 18.4 — Total financial assets $ 28,178.9 $ 27,275.0 $ 680.5 $ 26,465.5 $ 129.0 Financial liabilities: Total deposits, excluding time deposits $ 20,836.8 $ 20,836.8 $ 20,836.8 $ — $ — Time deposits 2,742.4 2,695.4 — 2,695.4 — Securities sold under repurchase agreements 929.9 929.9 — 929.9 — Other borrowed funds 2,589.0 2,589.0 — 2,589.0 — Accrued interest payable 45.8 45.8 — 45.8 — Long-term debt 120.8 112.3 — 112.3 — Subordinated debentures held by subsidiary trusts 163.1 154.0 — 154.0 — Derivative liabilities 163.1 163.1 — 163.1 — Deferred compensation plan liabilities 18.4 18.4 — 18.4 — Total financial liabilities $ 27,609.3 $ 27,544.7 $ 20,836.8 $ 6,707.9 $ — Fair Value Measurements at Reporting Date Using As of December 31, 2022 Carrying Amount Estimated Quoted Prices in Active Markets for Significant Other Significant Financial assets: Cash and cash equivalents $ 870.5 $ 870.5 $ 870.5 $ — $ — Investment debt securities available-for-sale 6,946.1 6,946.1 — 6,946.1 — Investment debt securities held-to-maturity 3,451.8 3,052.2 — 3,052.2 — Accrued interest receivable 118.3 118.3 — 118.3 — Mortgage servicing rights, net 31.1 37.4 — 37.4 — Loans held for sale 79.9 79.9 — 6.9 73.0 Net loans held for investment 17,879.1 17,552.1 — 17,513.0 39.1 Derivative assets 45.2 45.2 — 45.2 — Deferred compensation plan assets 18.7 18.7 — 18.7 — Total financial assets $ 29,440.7 $ 28,720.4 $ 870.5 $ 27,737.8 $ 112.1 Financial liabilities: Total deposits, excluding time deposits $ 23,145.2 $ 23,145.2 $ 23,145.2 $ — $ — Time deposits 1,928.4 1,876.1 — 1,876.1 — Securities sold under repurchase agreements 1,052.9 1,052.9 — 1,052.9 — Other borrowed funds 2,327.0 2,327.0 — 2,327.0 — Accrued interest payable 14.5 14.5 — 14.5 — Long-term debt 120.8 116.3 — 116.3 — Subordinated debentures held by subsidiary trusts 163.1 155.8 — 155.8 — Derivative liabilities 159.6 159.6 — 159.6 — Deferred compensation plan liabilities 18.7 18.7 — 18.7 — Total financial liabilities $ 28,930.2 $ 28,866.1 $ 23,145.2 $ 5,720.9 $ —

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 01, 2022 USD ($) office $ / shares shares	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 1,100.9		$ 1,100.9		$ 1,100.9
Acquisition related expenses		$ 0	$ 45.8	$ 0	$ 111
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 31.7
Core Deposits
Business Acquisition [Line Items]
Estimated useful lives of related deposits				10 years
Great Western Bank
Business Acquisition [Line Items]
Number of banking offices acquired | office	174
Total consideration exchanged	$ 1,723.3
Goodwill	479.3
Core deposit intangibles	50.1
Customer relationship intangible	22.8
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	46.9
Price per share of First Interstate Class A common stock (in dollars per share) | $ / shares	$ 36.76

Acquisitions - Schedule of Reco

Acquisitions - Schedule of Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Feb. 01, 2022	Jun. 30, 2023	Dec. 31, 2022
Liabilities assumed:
Goodwill		$ 1,100,900	$ 1,100,900
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	217,000
Loans held for investment	7,705,000
Allowance for credit losses	(59,500)
Premises and equipment, including right of use lease assets	144,700
Other real estate owned	15,800
Company-owned life insurance	186,600
Core deposit intangibles	50,100
Customer relationship intangible	22,800
Mortgage servicing rights	1,300
Deferred tax assets, net	60,200
Other assets	200,800
Total assets acquired	13,351,800
Liabilities assumed:
Deposits	11,688,000
Securities sold under repurchase agreements	74,000
Accrued expenses and other liabilities	110,400
FHLB advances	122,900
Subordinated debt	36,400
Subordinated debentures held by subsidiary trusts	76,100
Total liabilities assumed	12,107,800
Net assets acquired	1,244,000
Class A common stock	1,723,300
Total consideration paid (1)	1,723,300
Goodwill	479,300
Cash paid in lieu of fractional shares	$ 13

Acquisitions - Schedule of Acqu

Acquisitions - Schedule of Acquired loans with Credit Impairment (Details) $ in Millions	Feb. 01, 2022 USD ($)
Business Acquisition [Line Items]
Purchase price (initial fair value)	$ 623.3
Allowance for credit losses	$ 298.2

Acquisitions - Schedule of Ac_2

Acquisitions - Schedule of Acquired Loans not Deemed to Have Credit Impairment (Details) $ in Millions	Feb. 01, 2022 USD ($)
Business Acquisition [Line Items]
Purchase price (initial fair value)	$ 623.3
Allowance for credit losses	$ 298.2

Acquisitions - Summary of Pro F

Acquisitions - Summary of Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.93	$ 1.76
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.93	$ 1.76
Great Western Bank
Business Acquisition [Line Items]
Total revenues	$ 300.7	$ 569.6
Net income	$ 101.1	$ 177.5

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0
Goodwill [Line Items]
Amortization of intangible assets		$ 3,900,000	$ 4,100,000	$ 7,900,000	$ 7,700,000
Core Deposits
Goodwill [Line Items]
Weighted average useful lives of related deposits				10 years
OCRI
Goodwill [Line Items]
Weighted average useful lives of related deposits				12 years

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Goodwill Carrying Value (Details) $ in Millions	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Net carrying value at beginning of the period	$ 1,100.9
Net carrying value at end of period	$ 1,100.9

Goodwill and Core Deposit Int_5

Goodwill and Core Deposit Intangibles - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Jun. 30, 2023	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
2024		$ 14.6
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	$ 177.5		$ 106
Finite-Lived Intangible Assets Acquired	72.9
Finite-Lived Intangible Assets, Period Increase (Decrease)	(1.4)
Finite-Lived Intangible Assets, Accumulated Amortization	(80.5)	(88.4)
75900000	97	89.1
Core Deposits
Finite-Lived Intangible Assets [Line Items]
2024		12.7
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	154.7		106
Finite-Lived Intangible Assets Acquired	50.1
Finite-Lived Intangible Assets, Period Increase (Decrease)	(1.4)
Finite-Lived Intangible Assets, Accumulated Amortization	(78.8)	(85.7)
75900000	75.9	69
OCRI
Finite-Lived Intangible Assets [Line Items]
2024		1.9
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Gross	22.8		$ 0
Finite-Lived Intangible Assets Acquired	22.8
Finite-Lived Intangible Assets, Period Increase (Decrease)	0
Finite-Lived Intangible Assets, Accumulated Amortization	(1.7)	(2.7)
75900000	$ 21.1	$ 20.1

Goodwill and Core Deposit Int_6

Goodwill and Core Deposit Intangibles - Schedule of Future Amortization Expense (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
2023 remaining	$ 7.7
2024	14.6
2025	13.7
2026	12.8
2027	10.1
Finite-Lived Intangible Asset, Expected Amortization, After Year Four	30.2
Total	89.1	$ 97
Core Deposits
Finite-Lived Intangible Assets [Line Items]
2023 remaining	6.8
2024	12.7
2025	11.8
2026	10.9
2027	8.2
Finite-Lived Intangible Asset, Expected Amortization, After Year Four	18.6
Total	69	75.9
OCRI
Finite-Lived Intangible Assets [Line Items]
2023 remaining	0.9
2024	1.9
2025	1.9
2026	1.9
2027	1.9
Finite-Lived Intangible Asset, Expected Amortization, After Year Four	11.6
Total	$ 20.1	$ 21.1

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Available-for-Sale:
Gross Unrealized Gains	$ 0.2			$ 2.3
Gross Unrealized Losses	(590.5)			(629.7)
Held-to-Maturity:
Investment securities classified as held to maturity	3,318.4			3,453.7
Allowance for Credit Losses	(0.7)	$ (1.6)	$ (0.7)	(1.9)	$ (1.6)	$ 0
Net Amortized Cost	3,317.7			3,451.8
Gross Unrealized Gains	0.4			0.4
Gross Unrealized Losses	(393.4)			(400)
Investment debt securities held-to-maturity	2,924.7			3,052.2
Estimated Fair Value	5,857.9			6,946.1
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	6,448.2			7,573.5
Allowance for Credit Losses	(1.4)	0	$ (2.6)	0	$ 0	$ 0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	6,449.6			7,573.5
U.S. Treasury notes
Available-for-Sale:
Gross Unrealized Gains	0			2.1
Gross Unrealized Losses	(31)			(34.5)
Held-to-Maturity:
Investment securities classified as held to maturity	397.8			396.6
Allowance for Credit Losses	0			0
Net Amortized Cost	397.8			396.6
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(8.9)			(10.2)
Investment debt securities held-to-maturity	388.9			386.4
Estimated Fair Value	219.1			642.7
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	250.1			675.1
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	250.1			675.1
State, county, and municipal securities
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(43.2)			(50.6)
Held-to-Maturity:
Investment securities classified as held to maturity	180.5			181.2
Allowance for Credit Losses	0			(0.1)
Net Amortized Cost	180.5			181.1
Gross Unrealized Gains	0.2			0.2
Gross Unrealized Losses	(27)			(31.6)
Investment debt securities held-to-maturity	153.7			149.7
Estimated Fair Value	214.9			263.7
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	258.1			314.3
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	258.1			314.3
Obligations of U.S. government agencies
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(14.4)			(17.3)
Held-to-Maturity:
Investment securities classified as held to maturity	353.1			351.7
Allowance for Credit Losses	0			0
Net Amortized Cost	353.1			351.7
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(48.9)			(49.6)
Investment debt securities held-to-maturity	304.2			302.1
Estimated Fair Value	172			198.9
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	186.4			216.2
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	186.4			216.2
U.S. agency commercial mortgage-backed securities
Held-to-Maturity:
Debt Securities, Held-To-Maturity, Transfer, Unamortized Gain	12.3	$ 20.1
Debt Securities, Held-To-Maturity, Transfer, Unamortized Loss	(19.2)
Corporate Debt Securities
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(32.6)			(30.8)
Held-to-Maturity:
Investment securities classified as held to maturity	57.1			80.1
Allowance for Credit Losses	(0.7)			(1.8)
Net Amortized Cost	56.4			78.3
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(7.8)			(7)
Investment debt securities held-to-maturity	48.6			71.3
Estimated Fair Value	227.5			241.5
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	260.1			272.3
Allowance for Credit Losses	(1.4)			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	261.5			272.3
Collateralized Mortgage Obligations
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(145.6)			(141.3)
Held-to-Maturity:
Investment securities classified as held to maturity	500.7			525.8
Allowance for Credit Losses	0			0
Net Amortized Cost	500.7			525.8
Gross Unrealized Gains	0.2			0.2
Gross Unrealized Losses	(78.7)			(76.7)
Investment debt securities held-to-maturity	422.2			449.3
Estimated Fair Value	1,205.2			1,350.2
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,350.8			1,491.5
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,350.8			1,491.5
Commercial Mortgage-Backed Securities
Available-for-Sale:
Gross Unrealized Gains	0.2			0.2
Gross Unrealized Losses	(110.7)			(117)
Held-to-Maturity:
Investment securities classified as held to maturity	517.8			526.8
Allowance for Credit Losses	0			0
Net Amortized Cost	517.8			526.8
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(61.4)			(58.3)
Investment debt securities held-to-maturity	456.4			468.5
Estimated Fair Value	1,102.4			1,351.2
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,212.9			1,468
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,212.9			1,468
Residential Mortgage Backed Securities
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(159.1)			(167.7)
Held-to-Maturity:
Investment securities classified as held to maturity	1,311.4			1,391.5
Allowance for Credit Losses	0			0
Net Amortized Cost	1,311.4			1,391.5
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(160.7)			(166.6)
Investment debt securities held-to-maturity	1,150.7			1,224.9
Estimated Fair Value	1,375.4			1,558.3
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,534.5			1,726
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,534.5			1,726
Other investments
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	0			0
Held-to-Maturity:
Estimated Fair Value	0			0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss				0
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	0			0
Private mortgage-backed securities
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(36.4)			(36.9)
Held-to-Maturity:
Estimated Fair Value	217.1			228
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	253.5			264.9
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	253.5			264.9
Collateralized Loan Obligations
Available-for-Sale:
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(17.5)			(33.6)
Held-to-Maturity:
Estimated Fair Value	1,124.3			1,111.6
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,141.8			1,145.2
Allowance for Credit Losses	0			0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 1,141.8			$ 1,145.2

Investment Securities - Gross U

Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Available-for-Sale:
Fair Value, Less than 12 Months	$ 1,114.2		$ 5,071.9
Gross Unrealized Losses, Less than 12 Months	(67)		(346.6)
Fair Value, 12 Months or Longer	4,731.7		1,545.6
Gross Unrealized Losses, 12 Months or Longer	(523.5)		(283.1)
Fair Value, Total	5,845.9		6,617.5
Gross Unrealized Losses, Total	(590.5)		(629.7)
Allowance for Credit Losses	(1.4)	$ (2.6)	0	$ 0	$ 0	$ 0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	6,448.2		7,573.5
Gross Unrealized Gains	0.2		2.3
Gross Unrealized Losses	(590.5)		(629.7)
Estimated Fair Value	5,857.9		6,946.1
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	6,449.6		7,573.5
Investment securities classified as held to maturity	3,318.4		3,453.7
Allowance for Credit Losses	(0.7)	$ (0.7)	(1.9)	$ (1.6)	$ (1.6)	$ 0
Net Amortized Cost	3,317.7		3,451.8
Gross Unrealized Gains	0.4		0.4
Gross Unrealized Losses	(393.4)		(400)
Investment debt securities held-to-maturity	2,924.7		3,052.2
US Treasury Notes Securities
Available-for-Sale:
Fair Value, Less than 12 Months	47.2
Gross Unrealized Losses, Less than 12 Months	(2.3)
Fair Value, 12 Months or Longer	171.9
Gross Unrealized Losses, 12 Months or Longer	(28.7)
Fair Value, Total	219.1
Gross Unrealized Losses, Total	(31)
U.S. Treasury notes
Available-for-Sale:
Fair Value, Less than 12 Months			168.8
Gross Unrealized Losses, Less than 12 Months			(4.7)
Fair Value, 12 Months or Longer			170.4
Gross Unrealized Losses, 12 Months or Longer			(29.8)
Fair Value, Total			339.2
Gross Unrealized Losses, Total			(34.5)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	250.1		675.1
Gross Unrealized Gains	0		2.1
Gross Unrealized Losses	(31)		(34.5)
Estimated Fair Value	219.1		642.7
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	250.1		675.1
Investment securities classified as held to maturity	397.8		396.6
Allowance for Credit Losses	0		0
Net Amortized Cost	397.8		396.6
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(8.9)		(10.2)
Investment debt securities held-to-maturity	388.9		386.4
State, county, and municipal securities
Available-for-Sale:
Fair Value, Less than 12 Months	9		104.9
Gross Unrealized Losses, Less than 12 Months	(0.4)		(9)
Fair Value, 12 Months or Longer	204		146.1
Gross Unrealized Losses, 12 Months or Longer	(42.8)		(41.6)
Fair Value, Total	213		251
Gross Unrealized Losses, Total	(43.2)		(50.6)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	258.1		314.3
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(43.2)		(50.6)
Estimated Fair Value	214.9		263.7
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	258.1		314.3
Investment securities classified as held to maturity	180.5		181.2
Allowance for Credit Losses	0		(0.1)
Net Amortized Cost	180.5		181.1
Gross Unrealized Gains	0.2		0.2
Gross Unrealized Losses	(27)		(31.6)
Investment debt securities held-to-maturity	153.7		149.7
Obligations of U.S. government agencies
Available-for-Sale:
Fair Value, Less than 12 Months	60.6		152.2
Gross Unrealized Losses, Less than 12 Months	(3.1)		(10.1)
Fair Value, 12 Months or Longer	111		46.1
Gross Unrealized Losses, 12 Months or Longer	(11.3)		(7.2)
Fair Value, Total	171.6		198.3
Gross Unrealized Losses, Total	(14.4)		(17.3)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	186.4		216.2
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(14.4)		(17.3)
Estimated Fair Value	172		198.9
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	186.4		216.2
Investment securities classified as held to maturity	353.1		351.7
Allowance for Credit Losses	0		0
Net Amortized Cost	353.1		351.7
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(48.9)		(49.6)
Investment debt securities held-to-maturity	304.2		302.1
Private mortgage-backed securities
Available-for-Sale:
Fair Value, Less than 12 Months	0		133.1
Gross Unrealized Losses, Less than 12 Months	0		(19.1)
Fair Value, 12 Months or Longer	217.1		94.9
Gross Unrealized Losses, 12 Months or Longer	(36.4)		(17.8)
Fair Value, Total	217.1		228
Gross Unrealized Losses, Total	(36.4)		(36.9)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	253.5		264.9
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(36.4)		(36.9)
Estimated Fair Value	217.1		228
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	253.5		264.9
Collateralized Loan Obligations
Available-for-Sale:
Fair Value, Less than 12 Months	0		1,082.6
Gross Unrealized Losses, Less than 12 Months	0		(33.1)
Fair Value, 12 Months or Longer	1,124.3		28.9
Gross Unrealized Losses, 12 Months or Longer	(17.5)		(0.5)
Fair Value, Total	1,124.3		1,111.5
Gross Unrealized Losses, Total	(17.5)		(33.6)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,141.8		1,145.2
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(17.5)		(33.6)
Estimated Fair Value	1,124.3		1,111.6
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,141.8		1,145.2
Corporate Debt Securities
Available-for-Sale:
Fair Value, Less than 12 Months	16.3		130.6
Gross Unrealized Losses, Less than 12 Months	(0.9)		(8.3)
Fair Value, 12 Months or Longer	211.2		110.8
Gross Unrealized Losses, 12 Months or Longer	(31.7)		(22.5)
Fair Value, Total	227.5		241.4
Gross Unrealized Losses, Total	(32.6)		(30.8)
Allowance for Credit Losses	(1.4)		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	260.1		272.3
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(32.6)		(30.8)
Estimated Fair Value	227.5		241.5
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	261.5		272.3
Investment securities classified as held to maturity	57.1		80.1
Allowance for Credit Losses	(0.7)		(1.8)
Net Amortized Cost	56.4		78.3
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(7.8)		(7)
Investment debt securities held-to-maturity	48.6		71.3
Commercial Mortgage-Backed Securities
Available-for-Sale:
Fair Value, Less than 12 Months	396		1,069.8
Gross Unrealized Losses, Less than 12 Months	(23.7)		(59.9)
Fair Value, 12 Months or Longer	696.8		270.8
Gross Unrealized Losses, 12 Months or Longer	(87)		(57)
Fair Value, Total	1,092.8		1,340.6
Gross Unrealized Losses, Total	(110.7)		(116.9)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,212.9		1,468
Gross Unrealized Gains	0.2		0.2
Gross Unrealized Losses	(110.7)		(117)
Estimated Fair Value	1,102.4		1,351.2
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,212.9		1,468
Investment securities classified as held to maturity	517.8		526.8
Allowance for Credit Losses	0		0
Net Amortized Cost	517.8		526.8
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(61.4)		(58.3)
Investment debt securities held-to-maturity	456.4		468.5
Residential Mortgage Backed Securities
Available-for-Sale:
Fair Value, Less than 12 Months	272.5		1,213.5
Gross Unrealized Losses, Less than 12 Months	(15.7)		(112.3)
Fair Value, 12 Months or Longer	1,102.8		344.6
Gross Unrealized Losses, 12 Months or Longer	(143.4)		(55.4)
Fair Value, Total	1,375.3		1,558.1
Gross Unrealized Losses, Total	(159.1)		(167.7)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,534.5		1,726
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(159.1)		(167.7)
Estimated Fair Value	1,375.4		1,558.3
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,534.5		1,726
Investment securities classified as held to maturity	1,311.4		1,391.5
Allowance for Credit Losses	0		0
Net Amortized Cost	1,311.4		1,391.5
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(160.7)		(166.6)
Investment debt securities held-to-maturity	1,150.7		1,224.9
Collateralized Mortgage Obligations
Available-for-Sale:
Fair Value, Less than 12 Months	312.6		1,016.4
Gross Unrealized Losses, Less than 12 Months	(20.9)		(90.1)
Fair Value, 12 Months or Longer	892.6		333
Gross Unrealized Losses, 12 Months or Longer	(124.7)		(51.3)
Fair Value, Total	1,205.2		1,349.4
Gross Unrealized Losses, Total	(145.6)		(141.4)
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss	1,350.8		1,491.5
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(145.6)		(141.3)
Estimated Fair Value	1,205.2		1,350.2
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	1,350.8		1,491.5
Investment securities classified as held to maturity	500.7		525.8
Allowance for Credit Losses	0		0
Net Amortized Cost	500.7		525.8
Gross Unrealized Gains	0.2		0.2
Gross Unrealized Losses	(78.7)		(76.7)
Investment debt securities held-to-maturity	422.2		449.3
Other investments
Available-for-Sale:
Allowance for Credit Losses	0		0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss			0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Estimated Fair Value	0		0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	0		0
Other Investments
Available-for-Sale:
Investment securities classified as held to maturity			0
Allowance for Credit Losses			0
Net Amortized Cost			0
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Investment debt securities held-to-maturity			0
Other Security Investments
Available-for-Sale:
Fair Value, Less than 12 Months	0
Gross Unrealized Losses, Less than 12 Months	0
Fair Value, 12 Months or Longer	0
Gross Unrealized Losses, 12 Months or Longer	0
Fair Value, Total	0
Gross Unrealized Losses, Total	$ 0
Investment securities classified as held to maturity			$ 0

Investment Securities - Narrati

Investment Securities - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) Investments	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Investments	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) Investments	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Allowance for Credit Losses						$ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 700,000	$ 1,600,000	$ 700,000	$ 1,600,000	$ 700,000	1,900,000	$ 1,600,000	$ 0
Interest Receivable	119,100,000		119,100,000			118,300,000
Debt Securities, Available-for-sale, Realized Gain	0	0		0
Debt Securities, Available-for-sale, Realized Loss	0	$ 0	(23,500,000)	$ 0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	7,227,800,000		7,227,800,000			4,998,900,000
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	$ 6,455,100,000		$ 6,455,100,000			$ 4,432,000,000
Investment securities in an unrealized loss position (securities) | Investments	1,030		1,030			1,222
Debt Securities, Current	$ 853,000,000		$ 853,000,000
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	1,593,800,000		1,593,800,000
Fair value of investment securities callable after one year but within five years	1,521,200,000		1,521,200,000
Callable structured notes amortized costs	$ 0		$ 0

Investment Securities - Availab

Investment Securities - Available-for-Sale Allowance for Credit loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 1.4	$ 0	$ 1.4	$ 0	$ 2.6	$ 0	$ 0	$ 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal)	$ (1.2)	$ 0	$ 1.4	$ 0

Investment Securities - Held-To

Investment Securities - Held-To-Maturity Allowance For Credit Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 0.7	$ 1.6	$ 0.7	$ 1.6	$ 0.7	$ 1.9	$ 1.6	$ 0
Debt Securities, Held-to-Maturity, Credit Loss Expense (Reversal)	$ 0	$ 0	$ (1.2)	$ 1.6

Investment Securities - Credit

Investment Securities - Credit Quality Indicators (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	$ 3,318.4	$ 3,453.7
AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	3,149.9	3,260.7
AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	92.6	92.8
A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	10.6	11.5
BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	52.1	65.1
Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	13.2	13.6
BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	10
U.S. Treasury notes
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	397.8	396.6
U.S. Treasury notes | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	397.8	396.6
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
U.S. Treasury notes | BB Rating
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	180.5	181.2
State, county, and municipal securities | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	69.1	68.3
State, county, and municipal securities | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	92.6	92.8
State, county, and municipal securities | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	10.6	11.5
State, county, and municipal securities | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
State, county, and municipal securities | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	8.2	8.6
State, county, and municipal securities | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Obligations of U.S. government agencies
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	353.1	351.7
Obligations of U.S. government agencies | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	353.1	351.7
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
Obligations of U.S. government agencies | BB Rating
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	57.1	80.1
Corporate securities | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Corporate securities | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Corporate securities | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Corporate securities | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	52.1	65.1
Corporate securities | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	5	5
Corporate securities | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	10
Commercial Mortgage-Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	517.8	526.8
Commercial Mortgage-Backed Securities | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	361.9	364.9
Commercial Mortgage-Backed Securities | FNMA/FHLMC | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	361.9	364.9
Commercial Mortgage-Backed Securities | FNMA/FHLMC | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | FNMA/FHLMC | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | FNMA/FHLMC | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | FNMA/FHLMC | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | FNMA/FHLMC | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	155.9	161.9
Commercial Mortgage-Backed Securities | GNMA | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	155.9	161.9
Commercial Mortgage-Backed Securities | GNMA | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | GNMA | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | GNMA | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | GNMA | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Commercial Mortgage-Backed Securities | GNMA | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	1,311.4	1,391.5
Residential Mortgage Backed Securities | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	1,265.8	1,342.9
Residential Mortgage Backed Securities | FNMA/FHLMC | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	1,265.8	1,342.9
Residential Mortgage Backed Securities | FNMA/FHLMC | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | FNMA/FHLMC | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | FNMA/FHLMC | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | FNMA/FHLMC | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | FNMA/FHLMC | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	45.6	48.6
Residential Mortgage Backed Securities | GNMA | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	45.6	48.6
Residential Mortgage Backed Securities | GNMA | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | GNMA | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | GNMA | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | GNMA | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Residential Mortgage Backed Securities | GNMA | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Collateralized Mortgage Obligations
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	500.7	525.8
Collateralized Mortgage Obligations | FNMA/FHLMC
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	352.2	525.8
Collateralized Mortgage Obligations | FNMA/FHLMC | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	352.2	525.8
Collateralized Mortgage Obligations | FNMA/FHLMC | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Collateralized Mortgage Obligations | FNMA/FHLMC | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Collateralized Mortgage Obligations | FNMA/FHLMC | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Collateralized Mortgage Obligations | FNMA/FHLMC | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Collateralized Mortgage Obligations | FNMA/FHLMC | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0	0
Collateralized Mortgage Obligations | GNMA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	148.5
Collateralized Mortgage Obligations | GNMA | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	148.5
Collateralized Mortgage Obligations | GNMA | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0
Collateralized Mortgage Obligations | GNMA | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0
Collateralized Mortgage Obligations | GNMA | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0
Collateralized Mortgage Obligations | GNMA | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	0
Collateralized Mortgage Obligations | GNMA | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	$ 0
Other Security Investments
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		0
Other Security Investments | AAA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		0
Other Security Investments | AA
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		0
Other Security Investments | A
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		0
Other Security Investments | BBB
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		0
Other Security Investments | Not Rated
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		0
Other Security Investments | BB Rating
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity		$ 0

Investment Securities - Maturit

Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Available-for-Sale, Amortized Cost
Available-for-Sale Amortized Cost, Within One Year	$ 0.5
Available-for-Sale Amortized Cost, After One Year but Within Five Years	814.4
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years	1,655.7
Available-for-Sale Amortized Cost, After Ten Years	3,979
Amortized Cost	6,449.6	$ 7,573.5
Available-for-Sale, Estimated Fair Value
Available-for-Sale Estimated Fair Value, Within One Year	0.5
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years	761.3
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years	1,472.1
Available-for-Sale Estimated Fair Value, After Ten Years	3,624
Estimated Fair Value	5,857.9	6,946.1
Held-to-Maturity, Amortized Cost
Held-to-Maturity Amortized Cost, Within One Year	308.1
Held-to-Maturity Amortized Cost, After One Year but Within Five Years	346.6
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years	654.3
Held-to-Maturity Amortized Cost, After Ten Years	2,009.4
Amortized Cost1	3,318.4	3,453.7
Held-to-Maturity, Estimated Fair Value
Held-to-Maturity Estimated Fair Value, Within One Year	301.7
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years	322.9
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years	567.9
Held-to-Maturity Estimated Fair Value, After Ten Years	1,732.2
Investment debt securities held-to-maturity	2,924.7	3,052.2
Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	7,227.8	4,998.9
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	$ 6,455.1	$ 4,432

Loans Held for Sale - By Segmen

Loans Held for Sale - By Segment (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Loans held for sale	$ 76.5		$ 79.9
Transfer of loans to held-for-sale	3.1	$ 0
Transfer of loans from held-for-sale to held for investment	0	$ 19.8
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	76.5		79.9
Commercial construction
Debt Securities, Available-for-sale [Line Items]
Loans held for sale	6.4		10.5
Transfer of loans to held-for-sale	0
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	(4.1)
Proceeds from Collection of Loans Held-for-sale	0
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	6.4		10.5
Agricultural
Debt Securities, Available-for-sale [Line Items]
Loans held for sale	59.1		62.5
Transfer of loans to held-for-sale	0
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	2.2
Proceeds from Collection of Loans Held-for-sale	(5.6)
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	59.1		62.5
Loans held for sale	7.4
Unpaid Principle Balance of Loans Held for Sale	7.4
Real Estate Sector
Debt Securities, Available-for-sale [Line Items]
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	11		$ 6.9
Equal to or Greater than 90 Days Past Due | Agricultural
Debt Securities, Available-for-sale [Line Items]
Unpaid Principle Balance of Loans Held for Sale	5.6
Lower of Cost or Market | Agricultural
Debt Securities, Available-for-sale [Line Items]
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	$ 51.7

Non-Residential Loans Held for

Non-Residential Loans Held for Sale (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	$ 76.5		$ 79.9
Transfer of loans to held-for-sale	3.1	$ 0
Loans held for sale	76.5		79.9
Agricultural
Debt Securities, Available-for-sale [Line Items]
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	59.1		62.5
Proceeds from Collection of Loans Held-for-sale	(5.6)
Transfer of loans to held-for-sale	0
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	2.2
Loans held for sale	59.1		62.5
Commercial construction
Debt Securities, Available-for-sale [Line Items]
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance	6.4		10.5
Proceeds from Collection of Loans Held-for-sale	0
Transfer of loans to held-for-sale	0
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	(4.1)
Loans held for sale	6.4		10.5
Land Acquisition And Development Construction Financing Receivable [Member]
Debt Securities, Available-for-sale [Line Items]
Proceeds from Collection of Loans Held-for-sale	(3.1)
Transfer of loans to held-for-sale	3.1
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	0
Loans held for sale	$ 0		$ 0

Loans Held for Sale - Narrative

Loans Held for Sale - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Nonaccrual loans	$ 33.2		$ 39.8
Transfer of loans from held-for-sale to held for investment	0	$ 19.8
Loans held for sale	76.5		79.9
Transfer of loans to held-for-sale	3.1	$ 0
Agricultural
Debt Securities, Available-for-sale [Line Items]
Nonaccrual loans	26.8		29.3
Loans held for sale	59.1		62.5
Transfer of loans to held-for-sale	0
Proceeds from Collection of Loans Held-for-sale	5.6
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	2.2
Commercial construction
Debt Securities, Available-for-sale [Line Items]
Nonaccrual loans	6.4		10.5
Loans held for sale	6.4		10.5
Transfer of loans to held-for-sale	0
Proceeds from Collection of Loans Held-for-sale	0
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	(4.1)
Land Acquisition And Development Construction Financing Receivable [Member]
Debt Securities, Available-for-sale [Line Items]
Loans held for sale	0		$ 0
Transfer of loans to held-for-sale	3.1
Proceeds from Collection of Loans Held-for-sale	3.1
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option	$ 0

Loans Held for Investment - Sch

Loans Held for Investment - Schedule of Loans by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Deferred loan fees and costs	$ (13.6)		$ (15.6)
Loans held for investment, net of deferred fees and costs	18,263.4		18,099.2
Allowance for credit losses	(224.6)	$ (226.1)	(220.1)	$ (220.4)	$ (247.2)	$ (122.3)
Net loans held for investment	18,038.8		17,879.1
Nonaccrual loans	33.2		39.8
Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(89.5)	(125)	(43.9)
Financing Receivable, Loan in Process	4.2		7.5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	8,813.9		8,528.6
Nonaccrual loans	35.4		19.6
Commercial real estate | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	4.1		5.6
Commercial real estate | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.1		0.8
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		1.1
Commercial real estate | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	8,774.3		8,501.5
Residential
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(3.4)	(3.3)	(2.4)
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(14.9)	(10.2)	(6)
Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	14.5		11.6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,836.5		1,944.4
Nonaccrual loans	18.2		3.7
Total construction loans | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	8.2		10.4
Total construction loans | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	3		0.6
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	3.3		0.6
Total construction loans | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1,803.8		1,929.1
Residential
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(19.7)	(20.1)	(14.6)
Financing Receivable, Loan in Process	3.9		13.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,198.3		2,188.3
Nonaccrual loans	7.7		6.4
Residential | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1.2		9.9
Residential | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.1		2.1
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	0.6		1.2
Residential | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2,186.7		2,168.7
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(5.4)	(10.5)	(1.9)
Financing Receivable, Loan in Process	12		7.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	755.7		794.9
Nonaccrual loans	6.8		7.6
Agricultural | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	7.8		1.1
Agricultural | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	3.9		6.1
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	0.3		0
Agricultural | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	736.9		780.1
Total real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses	(158.7)	(147.5)	(138.7)	(133.7)	(169.6)	(69.3)
Financing Receivable, Loan in Process	34.6		39.5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,604.4		13,456.2
Nonaccrual loans	68.1		37.3
Total real estate | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	21.3		27
Total real estate | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	9.1		9.6
Total 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	4.2		2.9
Total real estate | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	13,501.7		13,379.4
Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(13.1)	(13.5)	(14.3)
Financing Receivable, Loan in Process	9.1		12.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	764.1		829.7
Nonaccrual loans	2.9		2.7
Indirect consumer | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	6.5		9.3
Indirect consumer | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.1		2.4
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	0.5		0.6
Indirect consumer | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	752.1		814.7
Direct and advance lines
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(5)	(4.6)	(4.6)
Financing Receivable, Loan in Process	1.2		1.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	144		152.9
Nonaccrual loans	0.2		0.3
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	0.6		0.8
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	0.5		0.3
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	0.1		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	142.6		151.4
Credit card
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses				(2.2)	(2.3)	(2.2)
Financing Receivable, Loan in Process	1.5		1.8
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	72.1		75.9
Nonaccrual loans	0		0
Credit card | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.7		0.8
Credit card | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.4		0.4
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		0.6
Credit card | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	70.6		74.1
Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses	(13.7)	(21.8)	(23.3)	(20.3)	(20.4)	(21.1)
Financing Receivable, Loan in Process	11.8		15.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	980.2		1,058.5
Nonaccrual loans	3.1		3
Total consumer loans | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	7.8		10.9
Total consumer loans | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	3		3.1
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	1		1.3
Total consumer loans | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	965.3		1,040.2
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses	(49.5)	(54.4)	(54.9)	(59.9)	(58.2)	(31.6)
Financing Receivable, Loan in Process	8		10.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,002.7		2,882.6
Nonaccrual loans	12.1		10.2
Commercial | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	4.6		7.1
Commercial | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2.3		1.7
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	1.1		2.1
Commercial | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	2,982.6		2,861.5
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Allowance for credit losses	(2.7)	$ (2.4)	(3.2)	$ (6.5)	$ 1	$ (0.3)
Financing Receivable, Loan in Process	1.8		3.1
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	688		708.3
Nonaccrual loans	2.8		8.7
Agricultural | 30 to 59 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1.3		0.8
Agricultural | 60 to 89 Days Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0.1		2.2
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		0.1
Agricultural | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	683.4		696.5
Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1.7		9.2
Nonaccrual loans	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
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
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
Other, including overdrafts | Financial Asset, Not Past Due
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	1.7		9.2
Loans And Leases Held For Investment [Member]
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Financing Receivable, Loan in Process	56.2		68.8
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	18,277		18,114.8
Nonaccrual loans	86.1		59.2
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	35		45.8
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	14.5		16.6
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	6.7		6.4
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	$ 18,134.7		$ 17,986.8

Loans Held for Investment - S_2

Loans Held for Investment - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 226.1	$ 247.2	$ 220.1	$ 122.3
Provision for (reduction of) credit losses	11.7	(1.7)	26.9	59.6
Loans Charged-Off(2)	(14.1)	(3.7)	(23)	(23.6)
Recoveries Collected	2.7	3.4	5.4	6.6
Ending balance	224.6	220.4	224.6	220.4
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	9.9	(1.7)	22.1	55.6
Provisional ACL Recorded for PCD loans		(24.8)		59.5
Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		45.2		17.3
Provision for (reduction of) credit losses		(8.8)		(2.1)
Loans Charged-Off(2)		0		(2.9)
Recoveries Collected		0		0
Ending balance		29.5		29.5
Provisional ACL Recorded for PCD loans		(6.9)		17.2
Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		25.2		13.3
Provision for (reduction of) credit losses		1.4		6
Loans Charged-Off(2)		0		(2.2)
Recoveries Collected		0		0
Ending balance		26.6		26.6
Provisional ACL Recorded for PCD loans		0		9.5
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		54.6		13.3
Provision for (reduction of) credit losses		(2.9)		8.5
Loans Charged-Off(2)		0		0
Recoveries Collected		0.7		0.7
Ending balance		33.4		33.4
Provisional ACL Recorded for PCD loans		(19)		10.9
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		125		43.9
Provision for (reduction of) credit losses		(10.3)		12.4
Loans Charged-Off(2)		0	(4.6)	(5.1)
Recoveries Collected		0.7		0.7
Ending balance		89.5		89.5
Provisional ACL Recorded for PCD loans		(25.9)		37.6
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.4	(1)	3.2	0.3
Provision for (reduction of) credit losses	0.2	6.3	(0.9)	5.8
Loans Charged-Off(2)	0	(0.1)	0	(5.4)
Recoveries Collected	0.1	0.2	0.4	1.3
Ending balance	2.7	6.5	2.7	6.5
Provisional ACL Recorded for PCD loans		1.1		4.5
Commercial and floor plans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		52.9		27.1
Provision for (reduction of) credit losses		1.9		20.3
Loans Charged-Off(2)		(1.1)		(5.3)
Recoveries Collected		0.4		0.8
Ending balance		54.1		54.1
Provisional ACL Recorded for PCD loans		0		11.2
Commercial purpose secured by 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5		4.4
Provision for (reduction of) credit losses		0.4		0.8
Loans Charged-Off(2)		0		0
Recoveries Collected		0.1		0.1
Ending balance		5.5		5.5
Provisional ACL Recorded for PCD loans		0		0.2
Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		3.3		2.4
Provision for (reduction of) credit losses		0.1		1
Loans Charged-Off(2)		0		0
Recoveries Collected		0		0
Ending balance		3.4		3.4
Provisional ACL Recorded for PCD loans		0		0
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		10.2		6
Provision for (reduction of) credit losses		4.7		8.7
Loans Charged-Off(2)		0		0
Recoveries Collected		0		0
Ending balance		14.9		14.9
Provisional ACL Recorded for PCD loans		0		0.2
Total construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		14		8.9
Provision for (reduction of) credit losses		5		9.1
Loans Charged-Off(2)		0		(2.7)
Recoveries Collected		0.1		0.2
Ending balance		19.1		19.1
Provisional ACL Recorded for PCD loans		0		3.6
Residential 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		18.7		13.4
Provision for (reduction of) credit losses		(0.7)		4.5
Loans Charged-Off(2)		0		(0.1)
Recoveries Collected		0.2		0.3
Ending balance		18.2		18.2
Provisional ACL Recorded for PCD loans		0		0.1
Home equity and HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1.4		1.2
Provision for (reduction of) credit losses		(0.1)		0
Loans Charged-Off(2)		0		0
Recoveries Collected		0.2		0.3
Ending balance		1.5		1.5
Provisional ACL Recorded for PCD loans		0		0
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		20.1		14.6
Provision for (reduction of) credit losses		(0.8)		4.5
Loans Charged-Off(2)		0	(0.5)	(0.1)
Recoveries Collected		0.4		0.6
Ending balance		19.7		19.7
Provisional ACL Recorded for PCD loans		0		0.1
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		10.5		1.9
Provision for (reduction of) credit losses		(5.1)		1.3
Loans Charged-Off(2)		(0.1)	0	(0.2)
Recoveries Collected		0.1		0.1
Ending balance		5.4		5.4
Provisional ACL Recorded for PCD loans		0		2.3
Total real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	147.5	169.6	138.7	69.3
Provision for (reduction of) credit losses	20.4	(11.2)	33.8	27.3
Loans Charged-Off(2)	(10)	(0.1)	(14.8)	(8.1)
Recoveries Collected	0.8	1.3	1	1.6
Ending balance	158.7	133.7	158.7	133.7
Provisional ACL Recorded for PCD loans		(25.9)		43.6
Indirect consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		13.5		14.3
Provision for (reduction of) credit losses		(0.4)		(0.7)
Loans Charged-Off(2)		(0.8)	(3.4)	(1.7)
Recoveries Collected		0.8		1.2
Ending balance		13.1		13.1
Provisional ACL Recorded for PCD loans		0		0
Direct and advance lines
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		4.6		4.6
Provision for (reduction of) credit losses		0.5		0.4
Loans Charged-Off(2)		(0.6)	(1.9)	(1.4)
Recoveries Collected		0.5		1.4
Ending balance		5		5
Provisional ACL Recorded for PCD loans		0		0
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2.3		2.2
Provision for (reduction of) credit losses		0.7		1.3
Loans Charged-Off(2)		(0.9)	(1.4)	(1.5)
Recoveries Collected		0.1		0.2
Ending balance		2.2		2.2
Provisional ACL Recorded for PCD loans		0		0
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21.8	20.4	23.3	21.1
Provision for (reduction of) credit losses	(6.2)	0.8	(5.5)	1
Loans Charged-Off(2)	(3.3)	(2.3)	(6.7)	(4.6)
Recoveries Collected	1.4	1.4	2.6	2.8
Ending balance	13.7	20.3	13.7	20.3
Provisional ACL Recorded for PCD loans		0		0
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		0.3		0.1
Provision for (reduction of) credit losses		0.1		0.4
Loans Charged-Off(2)		(0.1)		(0.2)
Recoveries Collected		0		0
Ending balance		0.3		0.3
Provisional ACL Recorded for PCD loans		0		0
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	54.4	58.2	54.9	31.6
Provision for (reduction of) credit losses	(4.5)	2.4	(5.3)	21.5
Loans Charged-Off(2)	(0.8)	(1.2)	(1.5)	(5.5)
Recoveries Collected	0.4	0.5	1.4	0.9
Ending balance	$ 49.5	59.9	$ 49.5	59.9
Provisional ACL Recorded for PCD loans		0		11.4
Land Acquisition And Development Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		0.5		0.5
Provision for (reduction of) credit losses		0.2		(0.6)
Loans Charged-Off(2)		0		(2.7)
Recoveries Collected		0.1		0.2
Ending balance		0.8		0.8
Provisional ACL Recorded for PCD loans		$ 0		$ 3.4

Loans Held for Investment - S_3

Loans Held for Investment - Schedule of Allowance for Credit Losses for Loans Held for Investment (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) Investments	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Investments	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Investments
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 226,100,000	$ 247,200,000	$ 220,100,000	$ 122,300,000
Provision charged to operating expense	11,700,000	(1,700,000)	26,900,000	59,600,000
Loans Charged-Off(2)	(14,100,000)	(3,700,000)	(23,000,000)	(23,600,000)
Ending balance	224,600,000	220,400,000	224,600,000	220,400,000
Provisional ACL Recorded for PCD loans		(24,800,000)		59,500,000
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	9,900,000	(1,700,000)	22,100,000	55,600,000
Financing Receivable, Allowance for Credit Loss, Recovery	2,700,000	3,400,000	5,400,000	6,600,000
Interest Receivable	119,100,000		119,100,000		$ 118,300,000
Debt Securities, Available-for-sale, Realized Loss	$ 0	0	$ (23,500,000)	0
Allowance for Credit Losses					$ 0
Investment securities in an unrealized loss position (securities) | Investments	1,030		1,030		1,222
Debt Securities, Available-for-sale, Realized Gain	$ 0	0		0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	7,227,800,000		$ 7,227,800,000		$ 4,998,900,000
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	6,455,100,000		6,455,100,000		4,432,000,000
Callable Within One Year
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Amortized cost of investment securities callable after one year but within five years	1,593,800,000		1,593,800,000
Fair value of investment securities callable after one year but within five years	1,521,200,000		1,521,200,000
Callable structured notes amortized costs	0		0
Debt Securities
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Interest Receivable	38,100,000		38,100,000		$ 38,900,000
Commercial Real Estate Non Owner Occupied Loans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		45,200,000		17,300,000
Provision charged to operating expense		(8,800,000)		(2,100,000)
Loans Charged-Off(2)		0		(2,900,000)
Ending balance		29,500,000		29,500,000
Provisional ACL Recorded for PCD loans		(6,900,000)		17,200,000
Financing Receivable, Allowance for Credit Loss, Recovery		0		0
Agricultural Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,400,000	(1,000,000)	3,200,000	300,000
Provision charged to operating expense	200,000	6,300,000	(900,000)	5,800,000
Loans Charged-Off(2)	0	(100,000)	0	(5,400,000)
Ending balance	2,700,000	6,500,000	2,700,000	6,500,000
Provisional ACL Recorded for PCD loans		1,100,000		4,500,000
Financing Receivable, Allowance for Credit Loss, Recovery	100,000	200,000	400,000	1,300,000
Commercial and Floor Plans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		52,900,000		27,100,000
Provision charged to operating expense		1,900,000		20,300,000
Loans Charged-Off(2)		(1,100,000)		(5,300,000)
Ending balance		54,100,000		54,100,000
Provisional ACL Recorded for PCD loans		0		11,200,000
Financing Receivable, Allowance for Credit Loss, Recovery		400,000		800,000
Commercial Real Estate Owner Occupied [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		25,200,000		13,300,000
Provision charged to operating expense		1,400,000		6,000,000
Loans Charged-Off(2)		0		(2,200,000)
Ending balance		26,600,000		26,600,000
Provisional ACL Recorded for PCD loans		0		9,500,000
Financing Receivable, Allowance for Credit Loss, Recovery		0		0
Commercial Real Estate Multi-family [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		54,600,000		13,300,000
Provision charged to operating expense		(2,900,000)		8,500,000
Loans Charged-Off(2)		0		0
Ending balance		33,400,000		33,400,000
Provisional ACL Recorded for PCD loans		(19,000,000)		10,900,000
Financing Receivable, Allowance for Credit Loss, Recovery		700,000		700,000
Commercial real estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		125,000,000		43,900,000
Provision charged to operating expense		(10,300,000)		12,400,000
Loans Charged-Off(2)		0	(4,600,000)	(5,100,000)
Ending balance		89,500,000		89,500,000
Provisional ACL Recorded for PCD loans		(25,900,000)		37,600,000
Financing Receivable, Allowance for Credit Loss, Recovery		700,000		700,000
Land Acquisition And Development Construction Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		500,000		500,000
Provision charged to operating expense		200,000		(600,000)
Loans Charged-Off(2)		0		(2,700,000)
Ending balance		800,000		800,000
Provisional ACL Recorded for PCD loans		0		3,400,000
Financing Receivable, Allowance for Credit Loss, Recovery		100,000		200,000
Residential construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		3,300,000		2,400,000
Provision charged to operating expense		100,000		1,000,000
Loans Charged-Off(2)		0		0
Ending balance		3,400,000		3,400,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		0		0
Commercial construction
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		10,200,000		6,000,000
Provision charged to operating expense		4,700,000		8,700,000
Loans Charged-Off(2)		0		0
Ending balance		14,900,000		14,900,000
Provisional ACL Recorded for PCD loans		0		200,000
Financing Receivable, Allowance for Credit Loss, Recovery		0		0
Construction Loans [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		14,000,000		8,900,000
Provision charged to operating expense		5,000,000		9,100,000
Loans Charged-Off(2)		0		(2,700,000)
Ending balance		19,100,000		19,100,000
Provisional ACL Recorded for PCD loans		0		3,600,000
Financing Receivable, Allowance for Credit Loss, Recovery		100,000		200,000
Residential Real Estate 1-4 Family [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		18,700,000		13,400,000
Provision charged to operating expense		(700,000)		4,500,000
Loans Charged-Off(2)		0		(100,000)
Ending balance		18,200,000		18,200,000
Provisional ACL Recorded for PCD loans		0		100,000
Financing Receivable, Allowance for Credit Loss, Recovery		200,000		300,000
Home Equity Line of Credit [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1,400,000		1,200,000
Provision charged to operating expense		(100,000)		0
Loans Charged-Off(2)		0		0
Ending balance		1,500,000		1,500,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		200,000		300,000
Residential Real Estate [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		20,100,000		14,600,000
Provision charged to operating expense		(800,000)		4,500,000
Loans Charged-Off(2)		0	(500,000)	(100,000)
Ending balance		19,700,000		19,700,000
Provisional ACL Recorded for PCD loans		0		100,000
Financing Receivable, Allowance for Credit Loss, Recovery		400,000		600,000
Agricultural Real Estate Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		10,500,000		1,900,000
Provision charged to operating expense		(5,100,000)		1,300,000
Loans Charged-Off(2)		(100,000)	0	(200,000)
Ending balance		5,400,000		5,400,000
Provisional ACL Recorded for PCD loans		0		2,300,000
Financing Receivable, Allowance for Credit Loss, Recovery		100,000		100,000
Real Estate Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	147,500,000	169,600,000	138,700,000	69,300,000
Provision charged to operating expense	20,400,000	(11,200,000)	33,800,000	27,300,000
Loans Charged-Off(2)	(10,000,000)	(100,000)	(14,800,000)	(8,100,000)
Ending balance	158,700,000	133,700,000	158,700,000	133,700,000
Provisional ACL Recorded for PCD loans		(25,900,000)		43,600,000
Financing Receivable, Allowance for Credit Loss, Recovery	800,000	1,300,000	1,000,000	1,600,000
Consumer Indirect Financing Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		13,500,000		14,300,000
Provision charged to operating expense		(400,000)		(700,000)
Loans Charged-Off(2)		(800,000)	(3,400,000)	(1,700,000)
Ending balance		13,100,000		13,100,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		800,000		1,200,000
Direct consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		4,600,000		4,600,000
Provision charged to operating expense		500,000		400,000
Loans Charged-Off(2)		(600,000)	(1,900,000)	(1,400,000)
Ending balance		5,000,000		5,000,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		500,000		1,400,000
Credit Card Receivable [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2,300,000		2,200,000
Provision charged to operating expense		700,000		1,300,000
Loans Charged-Off(2)		(900,000)	(1,400,000)	(1,500,000)
Ending balance		2,200,000		2,200,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		100,000		200,000
Consumer
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21,800,000	20,400,000	23,300,000	21,100,000
Provision charged to operating expense	(6,200,000)	800,000	(5,500,000)	1,000,000
Loans Charged-Off(2)	(3,300,000)	(2,300,000)	(6,700,000)	(4,600,000)
Ending balance	13,700,000	20,300,000	13,700,000	20,300,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery	1,400,000	1,400,000	2,600,000	2,800,000
Commercial Purpose secured by 1-4 Family [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5,000,000		4,400,000
Provision charged to operating expense		400,000		800,000
Loans Charged-Off(2)		0		0
Ending balance		5,500,000		5,500,000
Provisional ACL Recorded for PCD loans		0		200,000
Financing Receivable, Allowance for Credit Loss, Recovery		100,000		100,000
Commercial Borrower [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		300,000		100,000
Provision charged to operating expense		100,000		400,000
Loans Charged-Off(2)		(100,000)		(200,000)
Ending balance		300,000		300,000
Provisional ACL Recorded for PCD loans		0		0
Financing Receivable, Allowance for Credit Loss, Recovery		0		0
Commercial Portfolio Segment [Member]
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	54,400,000	58,200,000	54,900,000	31,600,000
Provision charged to operating expense	(4,500,000)	2,400,000	(5,300,000)	21,500,000
Loans Charged-Off(2)	(800,000)	(1,200,000)	(1,500,000)	(5,500,000)
Ending balance	49,500,000	59,900,000	49,500,000	59,900,000
Provisional ACL Recorded for PCD loans		0		11,400,000
Financing Receivable, Allowance for Credit Loss, Recovery	$ 400,000	$ 500,000	$ 1,400,000	$ 900,000

Loans Held for Investment - S_4

Loans Held for Investment - Schedule of Contractual Aging of Loans by Portfolio (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Nonaccrual loans	$ 33,200,000		$ 33,200,000		$ 39,800,000
Financing Receivable, Nonaccrual, Interest Income			0
Impaired Financing Receivable, Interest Income, Accrual Method	0	$ 0	0	$ 0
Less loans charged-off	14,100,000	3,700,000	23,000,000	23,600,000
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,200,000		4,200,000		7,500,000
Nonaccrual loans	35,400,000		35,400,000		19,600,000
Less loans charged-off		0	4,600,000	5,100,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	55,300,000		55,300,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	651,400,000		651,400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,285,800,000		2,285,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,778,600,000		1,778,600,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,317,400,000		1,317,400,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	807,100,000		807,100,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,884,100,000		1,884,100,000
Financing Receivable, Excluding Accrued Interest, Revolving	34,200,000		34,200,000
Total	8,813,900,000		8,813,900,000
Commercial real estate | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	55,000,000		55,000,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	633,800,000		633,800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,250,000,000		2,250,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,728,700,000		1,728,700,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,302,000,000		1,302,000,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	752,400,000		752,400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,784,900,000		1,784,900,000
Financing Receivable, Excluding Accrued Interest, Revolving	32,000,000		32,000,000
Total	8,538,800,000		8,538,800,000
Commercial real estate | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4,000,000		4,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	9,300,000		9,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	20,100,000		20,100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	5,800,000		5,800,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	25,500,000		25,500,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	69,100,000		69,100,000
Financing Receivable, Excluding Accrued Interest, Revolving	1,800,000		1,800,000
Total	135,600,000		135,600,000
Commercial real estate | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	300,000		300,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3,000,000		3,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	26,500,000		26,500,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	28,400,000		28,400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	9,600,000		9,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	29,200,000		29,200,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	30,100,000		30,100,000
Financing Receivable, Excluding Accrued Interest, Revolving	400,000		400,000
Total	127,500,000		127,500,000
Commercial real estate | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	10,600,000		10,600,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,400,000		1,400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Total	12,000,000		12,000,000
Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					118,400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					120,400,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					6,200,000
Financing Receivable, Excluding Accrued Interest, Revolving					270,100,000
Total					516,200,000
Residential construction | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					118,400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					119,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					5,800,000
Financing Receivable, Excluding Accrued Interest, Revolving					270,100,000
Total					515,300,000
Residential construction | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					500,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					900,000
Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					461,800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					399,200,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					112,800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					45,900,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					21,900,000
Total					1,042,000,000
Commercial construction | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					442,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					374,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					89,700,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					45,900,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					10,600,000
Total					964,100,000
Commercial construction | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					2,300,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					23,100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					11,300,000
Total					36,700,000
Commercial construction | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					16,800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					24,400,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					41,200,000
Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	14,500,000		14,500,000		11,600,000
Nonaccrual loans	18,200,000		18,200,000		3,700,000
Less loans charged-off			9,700,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	16,600,000		16,600,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	237,600,000		237,600,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	848,200,000		848,200,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	526,800,000		526,800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	49,800,000		49,800,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	20,600,000		20,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	40,700,000		40,700,000
Financing Receivable, Excluding Accrued Interest, Revolving	96,200,000		96,200,000
Total	1,836,500,000		1,836,500,000
Total construction loans | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	13,600,000		13,600,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	237,600,000		237,600,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	822,700,000		822,700,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	502,200,000		502,200,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	49,600,000		49,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	17,800,000		17,800,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	40,000,000		40,000,000
Financing Receivable, Excluding Accrued Interest, Revolving	96,200,000		96,200,000
Total	1,779,700,000		1,779,700,000
Total construction loans | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	3,000,000		3,000,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,600,000		8,600,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	100,000		100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,700,000		2,700,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	200,000		200,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Total	14,600,000		14,600,000
Total construction loans | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3,000,000		3,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	24,500,000		24,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	200,000		200,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	100,000		100,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	500,000		500,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Total	28,300,000		28,300,000
Total construction loans | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	13,900,000		13,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Total	13,900,000		13,900,000
Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	3,900,000		3,900,000		13,200,000
Nonaccrual loans	7,700,000		7,700,000		6,400,000
Less loans charged-off		0	500,000	100,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	12,500,000		12,500,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	33,500,000		33,500,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	300,400,000		300,400,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	508,500,000		508,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	523,600,000		523,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	97,600,000		97,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	245,400,000		245,400,000
Financing Receivable, Excluding Accrued Interest, Revolving	476,800,000		476,800,000
Total	2,198,300,000		2,198,300,000
Residential | Performing
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	12,500,000		12,500,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	33,400,000		33,400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	299,500,000		299,500,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	507,700,000		507,700,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	523,000,000		523,000,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	96,900,000		96,900,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	240,400,000		240,400,000
Financing Receivable, Excluding Accrued Interest, Revolving	476,600,000		476,600,000
Total	2,190,000,000		2,190,000,000
Residential | Nonperforming
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	100,000		100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	900,000		900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	800,000		800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	600,000		600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	700,000		700,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5,000,000		5,000,000
Financing Receivable, Excluding Accrued Interest, Revolving	200,000		200,000
Total	8,300,000		8,300,000
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	12,000,000		12,000,000		7,200,000
Nonaccrual loans	6,800,000		6,800,000		7,600,000
Less loans charged-off		100,000	0	200,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	400,000		400,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	46,500,000		46,500,000		204,200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	164,600,000		164,600,000		185,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	169,000,000		169,000,000		115,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	107,100,000		107,100,000		68,000,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	62,900,000		62,900,000		59,300,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	167,500,000		167,500,000		119,600,000
Financing Receivable, Excluding Accrued Interest, Revolving	37,700,000		37,700,000		42,500,000
Total	755,700,000		755,700,000		794,900,000
Agricultural | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	400,000		400,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	35,900,000		35,900,000		180,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	143,100,000		143,100,000		172,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	163,000,000		163,000,000		109,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	102,900,000		102,900,000		64,800,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	60,700,000		60,700,000		46,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	143,300,000		143,300,000		105,100,000
Financing Receivable, Excluding Accrued Interest, Revolving	28,800,000		28,800,000		31,400,000
Total	678,100,000		678,100,000		710,200,000
Agricultural | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2,600,000		2,600,000		22,400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	800,000		800,000		700,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,200,000		1,200,000		1,200,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2,000,000		2,000,000		2,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1,700,000		1,700,000		10,000,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	12,600,000		12,600,000		3,200,000
Financing Receivable, Excluding Accrued Interest, Revolving	8,900,000		8,900,000		11,000,000
Total	29,800,000		29,800,000		51,100,000
Agricultural | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	8,000,000		8,000,000		1,800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	20,700,000		20,700,000		12,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	4,800,000		4,800,000		3,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,200,000		1,200,000		600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	500,000		500,000		2,700,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	11,600,000		11,600,000		11,300,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		100,000
Total	46,800,000		46,800,000		32,300,000
Agricultural | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0		1,300,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,000,000		1,000,000		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Total	1,000,000		1,000,000		1,300,000
Total real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	34,600,000		34,600,000		39,500,000
Nonaccrual loans	68,100,000		68,100,000		37,300,000
Less loans charged-off	10,000,000	100,000	14,800,000	8,100,000
Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	9,100,000		9,100,000		12,300,000
Nonaccrual loans	2,900,000		2,900,000		2,700,000
Less loans charged-off		800,000	3,400,000	1,700,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	86,800,000		86,800,000		381,300,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	322,500,000		322,500,000		177,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	143,600,000		143,600,000		130,600,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	104,100,000		104,100,000		60,000,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	44,900,000		44,900,000		33,800,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	62,200,000		62,200,000		46,700,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Total	764,100,000		764,100,000		829,700,000
Indirect consumer | Performing
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	86,700,000		86,700,000		380,300,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	321,200,000		321,200,000		176,400,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	142,800,000		142,800,000		130,000,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	103,600,000		103,600,000		59,700,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	44,700,000		44,700,000		33,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	61,600,000		61,600,000		46,300,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Total	760,600,000		760,600,000		826,300,000
Indirect consumer | Nonperforming
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	100,000		100,000		1,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,300,000		1,300,000		900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	800,000		800,000		600,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	400,000		400,000		300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	200,000		200,000		200,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	500,000		500,000		400,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Total	3,300,000		3,300,000		3,400,000
Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,200,000		1,200,000		1,200,000
Nonaccrual loans	200,000		200,000		300,000
Less loans charged-off		600,000	1,900,000	1,400,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	300,000		300,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	23,900,000		23,900,000		52,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41,500,000		41,500,000		32,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	24,300,000		24,300,000		18,300,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	12,800,000		12,800,000		8,500,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,400,000		5,400,000		6,500,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	8,400,000		8,400,000		9,000,000
Financing Receivable, Excluding Accrued Interest, Revolving	27,400,000		27,400,000		25,900,000
Total	144,000,000		144,000,000		152,900,000
Direct and advance lines | Performing
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	300,000		300,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	23,900,000		23,900,000		52,600,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41,400,000		41,400,000		31,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	24,200,000		24,200,000		18,200,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	12,800,000		12,800,000		8,500,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5,400,000		5,400,000		6,500,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	8,300,000		8,300,000		8,900,000
Financing Receivable, Excluding Accrued Interest, Revolving	27,400,000		27,400,000		25,800,000
Total	143,700,000		143,700,000		152,400,000
Direct and advance lines | Nonperforming
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	100,000		100,000		100,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	100,000		100,000		100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	100,000		100,000		100,000
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		100,000
Total	300,000		300,000		500,000
Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,500,000		1,500,000		1,800,000
Nonaccrual loans	0		0		0
Less loans charged-off		900,000	1,400,000	1,500,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		178,100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	72,100,000		72,100,000
Total	72,100,000		72,100,000
Credit card | Performing
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		177,300,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	71,600,000		71,600,000
Total	71,600,000		71,600,000
Credit card | Nonperforming
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	500,000		500,000
Total	500,000		500,000
Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	11,800,000		11,800,000		15,300,000
Nonaccrual loans	3,100,000		3,100,000		3,000,000
Less loans charged-off	3,300,000	2,300,000	6,700,000	4,600,000
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	8,000,000		8,000,000		10,900,000
Nonaccrual loans	12,100,000		12,100,000		10,200,000
Less loans charged-off	800,000	1,200,000	1,500,000	5,500,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	36,200,000		36,200,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	298,300,000		298,300,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	604,000,000		604,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	442,700,000		442,700,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	254,400,000		254,400,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	134,000,000		134,000,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	352,100,000		352,100,000
Financing Receivable, Excluding Accrued Interest, Revolving	881,000,000		881,000,000
Total	3,002,700,000		3,002,700,000
Commercial | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	36,100,000		36,100,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	289,200,000		289,200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	577,900,000		577,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	422,600,000		422,600,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	247,100,000		247,100,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	127,000,000		127,000,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	344,700,000		344,700,000
Financing Receivable, Excluding Accrued Interest, Revolving	811,600,000		811,600,000
Total	2,856,200,000		2,856,200,000
Commercial | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	100,000		100,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	900,000		900,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	4,200,000		4,200,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	10,500,000		10,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	4,200,000		4,200,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2,300,000		2,300,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,500,000		1,500,000
Financing Receivable, Excluding Accrued Interest, Revolving	11,000,000		11,000,000
Total	34,700,000		34,700,000
Commercial | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4,000,000		4,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	21,900,000		21,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	8,400,000		8,400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3,100,000		3,100,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4,700,000		4,700,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5,900,000		5,900,000
Financing Receivable, Excluding Accrued Interest, Revolving	58,300,000		58,300,000
Total	106,300,000		106,300,000
Commercial | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4,200,000		4,200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,200,000		1,200,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	100,000		100,000
Total	5,500,000		5,500,000
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,800,000		1,800,000		3,100,000
Nonaccrual loans	2,800,000		2,800,000		8,700,000
Less loans charged-off	0	100,000	0	5,400,000
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	1,800,000		1,800,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	96,200,000		96,200,000		176,100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	94,900,000		94,900,000		67,600,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	50,400,000		50,400,000		35,000,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	28,000,000		28,000,000		12,200,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	9,000,000		9,000,000		10,100,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	12,300,000		12,300,000		3,300,000
Financing Receivable, Excluding Accrued Interest, Revolving	395,400,000		395,400,000		402,100,000
Total	688,000,000		688,000,000		706,400,000
Agricultural | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	1,400,000		1,400,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	50,900,000		50,900,000		127,200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	92,800,000		92,800,000		59,700,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	48,300,000		48,300,000		31,800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	26,300,000		26,300,000		10,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	8,300,000		8,300,000		8,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	10,800,000		10,800,000		3,100,000
Financing Receivable, Excluding Accrued Interest, Revolving	375,900,000		375,900,000		375,100,000
Total	614,700,000		614,700,000		616,100,000
Agricultural | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	200,000		200,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	800,000		800,000		26,100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,000,000		1,000,000		2,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	700,000		700,000		400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	300,000		300,000		1,000,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	200,000		200,000		300,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	200,000		200,000		0
Financing Receivable, Excluding Accrued Interest, Revolving	2,900,000		2,900,000		26,200,000
Total	6,300,000		6,300,000		56,800,000
Agricultural | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	200,000		200,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	44,500,000		44,500,000		22,800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,100,000		1,100,000		4,600,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,000,000		1,000,000		2,800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,400,000		1,400,000		600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	500,000		500,000		1,200,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,300,000		1,300,000		200,000
Financing Receivable, Excluding Accrued Interest, Revolving	16,600,000		16,600,000		800,000
Total	66,600,000		66,600,000		33,000,000
Agricultural | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0		500,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	400,000		400,000		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Total	400,000		400,000		500,000
Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	0		0		0
Nonaccrual loans	0		0		0
Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	56,200,000		56,200,000		68,800,000
Nonaccrual loans	86,100,000		86,100,000		59,200,000
Non-owner occupied
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		0		2,900,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1,163,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					882,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					674,200,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					490,400,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					261,100,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					907,600,000
Financing Receivable, Excluding Accrued Interest, Revolving					29,200,000
Total					4,408,200,000
Non-owner occupied | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1,162,600,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					861,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					661,100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					467,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					241,500,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					890,400,000
Financing Receivable, Excluding Accrued Interest, Revolving					29,200,000
Total					4,313,700,000
Non-owner occupied | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					6,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					2,300,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					4,600,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					7,400,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					22,100,000
Non-owner occupied | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					13,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					10,800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					18,200,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					19,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					9,800,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					72,400,000
Owner occupied
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		0		2,200,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					812,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					737,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					548,500,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					281,300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					179,900,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					574,000,000
Financing Receivable, Excluding Accrued Interest, Revolving					19,800,000
Total					3,153,500,000
Owner occupied | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					793,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					718,700,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					533,900,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					266,300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					165,800,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					551,300,000
Financing Receivable, Excluding Accrued Interest, Revolving					18,200,000
Total					3,047,200,000
Owner occupied | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					10,900,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					14,200,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					12,300,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					6,100,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					5,600,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					5,500,000
Financing Receivable, Excluding Accrued Interest, Revolving					1,100,000
Total					55,700,000
Owner occupied | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					8,400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					3,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					2,300,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					8,900,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					8,500,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					17,200,000
Financing Receivable, Excluding Accrued Interest, Revolving					500,000
Total					48,800,000
Owner occupied | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					400,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					1,400,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					1,800,000
Multi-family
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		0		0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					369,200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					204,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					189,000,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					52,100,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					35,000,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					115,700,000
Financing Receivable, Excluding Accrued Interest, Revolving					1,000,000
Total					966,900,000
Multi-family | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					369,200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					204,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					189,000,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					52,100,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					35,000,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					113,700,000
Financing Receivable, Excluding Accrued Interest, Revolving					1,000,000
Total					964,900,000
Multi-family | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					1,700,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					1,700,000
Multi-family | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					300,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					300,000
Commercial and floor plans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		1,100,000		5,300,000
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					527,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					370,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					219,400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					132,100,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					124,400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					178,100,000
Financing Receivable, Excluding Accrued Interest, Revolving					697,400,000
Total					2,249,400,000
Commercial and floor plans | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					501,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					358,900,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					214,400,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					124,300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					120,300,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					171,100,000
Financing Receivable, Excluding Accrued Interest, Revolving					631,600,000
Total					2,122,300,000
Commercial and floor plans | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					15,900,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					6,800,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					1,300,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					4,400,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					900,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					4,900,000
Financing Receivable, Excluding Accrued Interest, Revolving					18,500,000
Total					52,700,000
Commercial and floor plans | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					9,800,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					3,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					3,700,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					3,400,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					3,200,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					2,100,000
Financing Receivable, Excluding Accrued Interest, Revolving					47,200,000
Total					72,700,000
Commercial and floor plans | Doubtful
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					300,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					1,300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					100,000
Total					1,700,000
Commercial purpose secured by 1-4 family
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off		$ 0		$ 0
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					192,000,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					136,000,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					72,000,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					30,900,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					32,200,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					40,900,000
Financing Receivable, Excluding Accrued Interest, Revolving					28,900,000
Total					532,900,000
Commercial purpose secured by 1-4 family | Pass
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					191,700,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					134,500,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					69,800,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					30,400,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					29,900,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					39,500,000
Financing Receivable, Excluding Accrued Interest, Revolving					28,900,000
Total					524,700,000
Commercial purpose secured by 1-4 family | Other Assets Especially Mentioned
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					100,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					1,200,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					2,100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					200,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					1,400,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					200,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					5,200,000
Commercial purpose secured by 1-4 family | Substandard
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					200,000
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					300,000
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					100,000
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					300,000
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					900,000
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					1,200,000
Financing Receivable, Excluding Accrued Interest, Revolving					0
Total					3,000,000
30 to 59 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,100,000		4,100,000		5,600,000
30 to 59 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	8,200,000		8,200,000		10,400,000
30 to 59 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,200,000		1,200,000		9,900,000
30 to 59 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	7,800,000		7,800,000		1,100,000
30 to 59 Days Past Due | Total real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	21,300,000		21,300,000		27,000,000
30 to 59 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	6,500,000		6,500,000		9,300,000
30 to 59 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	600,000		600,000		800,000
30 to 59 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	700,000		700,000		800,000
30 to 59 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	7,800,000		7,800,000		10,900,000
30 to 59 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,600,000		4,600,000		7,100,000
30 to 59 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,300,000		1,300,000		800,000
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		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	35,000,000		35,000,000		45,800,000
60 to 89 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	100,000		100,000		800,000
60 to 89 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	3,000,000		3,000,000		600,000
60 to 89 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,100,000		2,100,000		2,100,000
60 to 89 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	3,900,000		3,900,000		6,100,000
60 to 89 Days Past Due | Total real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	9,100,000		9,100,000		9,600,000
60 to 89 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,100,000		2,100,000		2,400,000
60 to 89 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	500,000		500,000		300,000
60 to 89 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	400,000		400,000		400,000
60 to 89 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	3,000,000		3,000,000		3,100,000
60 to 89 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,300,000		2,300,000		1,700,000
60 to 89 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	100,000		100,000		2,200,000
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		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	14,500,000		14,500,000		16,600,000
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	0		0		1,100,000
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	3,300,000		3,300,000		600,000
Equal to or Greater than 90 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	600,000		600,000		1,200,000
Equal to or Greater than 90 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	300,000		300,000		0
Equal to or Greater than 90 Days Past Due | Total real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	4,200,000		4,200,000		2,900,000
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	500,000		500,000		600,000
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	100,000		100,000		100,000
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		400,000		600,000
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	1,000,000		1,000,000		1,300,000
Equal to or Greater than 90 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,100,000		1,100,000		2,100,000
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		400,000		100,000
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		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	6,700,000		6,700,000		6,400,000
Financial Asset, Not Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	8,774,300,000		8,774,300,000		8,501,500,000
Financial Asset, Not Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,803,800,000		1,803,800,000		1,929,100,000
Financial Asset, Not Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,186,700,000		2,186,700,000		2,168,700,000
Financial Asset, Not Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	736,900,000		736,900,000		780,100,000
Financial Asset, Not Past Due | Total real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	13,501,700,000		13,501,700,000		13,379,400,000
Financial Asset, Not Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	752,100,000		752,100,000		814,700,000
Financial Asset, Not Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	142,600,000		142,600,000		151,400,000
Financial Asset, Not Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	70,600,000		70,600,000		74,100,000
Financial Asset, Not Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	965,300,000		965,300,000		1,040,200,000
Financial Asset, Not Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	2,982,600,000		2,982,600,000		2,861,500,000
Financial Asset, Not Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	683,400,000		683,400,000		696,500,000
Financial Asset, Not Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Loan in Process	1,700,000		1,700,000		9,200,000
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	$ 18,134,700,000		18,134,700,000		$ 17,986,800,000
Year One, Originated, Current Fiscal Year | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			300,000
Year One, Originated, Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year One, Originated, Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			300,000
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			1,300,000
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			300,000
Year Two, Originated, Fiscal Year Before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Three, Originated, Two Years before Current Fiscal Year | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			1,700,000
Year Three, Originated, Two Years before Current Fiscal Year | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Three, Originated, Two Years before Current Fiscal Year | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Three, Originated, Two Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Three, Originated, Two Years before Current Fiscal Year | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			1,200,000
Year Three, Originated, Two Years before Current Fiscal Year | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Three, Originated, Two Years before Current Fiscal Year | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Three, Originated, Two Years before Current Fiscal Year | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Three, Originated, Two Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Four, Originated, Three Years before Current Fiscal Year | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			2,600,000
Year Four, Originated, Three Years before Current Fiscal Year | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Four, Originated, Three Years before Current Fiscal Year | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Four, Originated, Three Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Four, Originated, Three Years before Current Fiscal Year | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			500,000
Year Four, Originated, Three Years before Current Fiscal Year | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Four, Originated, Three Years before Current Fiscal Year | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Four, Originated, Three Years before Current Fiscal Year | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			200,000
Year Four, Originated, Three Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Five, Originated, Four Years before Current Fiscal Year | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Five, Originated, Four Years before Current Fiscal Year | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Five, Originated, Four Years before Current Fiscal Year | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Five, Originated, Four Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Five, Originated, Four Years before Current Fiscal Year | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Five, Originated, Four Years before Current Fiscal Year | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Five, Originated, Four Years before Current Fiscal Year | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Year Five, Originated, Four Years before Current Fiscal Year | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Year Five, Originated, Four Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Originated, More than Five Years before Current Fiscal Year | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Originated, More than Five Years before Current Fiscal Year | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Originated, More than Five Years before Current Fiscal Year | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Originated, More than Five Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Originated, More than Five Years before Current Fiscal Year | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			300,000
Originated, More than Five Years before Current Fiscal Year | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			1,400,000
Originated, More than Five Years before Current Fiscal Year | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Originated, More than Five Years before Current Fiscal Year | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Originated, More than Five Years before Current Fiscal Year | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			100,000
Revolving | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			1,400,000
Revolving | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			800,000
Revolving | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			9,600,000
Revolving, Converted to Term | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			0
Revolving, Converted to Term | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Less loans charged-off			$ 0

Loans Held for Investment - S_5

Loans Held for Investment - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Commitments to purchase or sell	$ 0	$ 0	$ 0	$ 0
Proceeds from sale of loans held-for-investment	0	0	0	0
Less loans charged-off	(14.1)	(3.7)	(23)	(23.6)
Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					$ 4,408.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1,163.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					882
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					674.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					490.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					261.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					907.6
Financing Receivable, Excluding Accrued Interest, Revolving					29.2
Less loans charged-off		0		(2.9)
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	8,813.9		8,813.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	651.4		651.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,285.8		2,285.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,778.6		1,778.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,317.4		1,317.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	807.1		807.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,884.1		1,884.1
Financing Receivable, Excluding Accrued Interest, Revolving	34.2		34.2
Less loans charged-off		0	(4.6)	(5.1)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	55.3		55.3
Commercial | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Commercial | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.3)
Commercial | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(1.7)
Commercial | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(2.6)
Commercial | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Commercial | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Commercial | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Commercial | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					516.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					118.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					120.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					6.2
Financing Receivable, Excluding Accrued Interest, Revolving					270.1
Less loans charged-off		0		0
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					1,042
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					461.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					399.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					112.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					45.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					21.9
Less loans charged-off		0		0
Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off		0		(2.7)
Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	2,198.3		2,198.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	33.5		33.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	300.4		300.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	508.5		508.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	523.6		523.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	97.6		97.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	245.4		245.4
Financing Receivable, Excluding Accrued Interest, Revolving	476.8		476.8
Less loans charged-off		0	(0.5)	(0.1)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	12.5		12.5
Residential | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.3)
Residential | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Residential | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Residential | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Residential | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Residential | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Residential | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Residential | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	1,836.5		1,836.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	237.6		237.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	848.2		848.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	526.8		526.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	49.8		49.8
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	20.6		20.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	40.7		40.7
Financing Receivable, Excluding Accrued Interest, Revolving	96.2		96.2
Less loans charged-off			(9.7)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	16.6		16.6
Total construction loans | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Total construction loans | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total construction loans | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(9.6)
Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	755.7		755.7		794.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	46.5		46.5		204.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	164.6		164.6		185.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	169		169		115.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	107.1		107.1		68
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	62.9		62.9		59.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	167.5		167.5		119.6
Financing Receivable, Excluding Accrued Interest, Revolving	37.7		37.7		42.5
Less loans charged-off		(0.1)	0	(0.2)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.4		0.4
Agricultural | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total real estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off	(10)	(0.1)	(14.8)	(8.1)
Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	764.1		764.1		829.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	86.8		86.8		381.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	322.5		322.5		177.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	143.6		143.6		130.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	104.1		104.1		60
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	44.9		44.9		33.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	62.2		62.2		46.7
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Less loans charged-off		(0.8)	(3.4)	(1.7)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Indirect consumer | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Indirect consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(1.3)
Indirect consumer | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(1.2)
Indirect consumer | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.5)
Indirect consumer | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Indirect consumer | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.3)
Indirect consumer | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Indirect consumer | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	144		144		152.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	23.9		23.9		52.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41.5		41.5		32
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	24.3		24.3		18.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	12.8		12.8		8.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5.4		5.4		6.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	8.4		8.4		9
Financing Receivable, Excluding Accrued Interest, Revolving	27.4		27.4		25.9
Less loans charged-off		(0.6)	(1.9)	(1.4)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.3		0.3
Direct consumer | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Direct consumer | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Direct consumer | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Direct consumer | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Direct consumer | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Direct consumer | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(1.4)
Direct consumer | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Direct consumer | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	72.1		72.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		178.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	72.1		72.1
Less loans charged-off		(0.9)	(1.4)	(1.5)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Credit card | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Credit card | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(1.4)
Credit card | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off	(3.3)	(2.3)	(6.7)	(4.6)
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	3,002.7		3,002.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	298.3		298.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	604		604
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	442.7		442.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	254.4		254.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	134		134
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	352.1		352.1
Financing Receivable, Excluding Accrued Interest, Revolving	881		881
Less loans charged-off	(0.8)	(1.2)	(1.5)	(5.5)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	36.2		36.2
Commercial | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Commercial | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.3)
Commercial | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Commercial | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.2)
Commercial | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.1)
Commercial | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Commercial | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			(0.8)
Commercial | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	688		688		706.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	96.2		96.2		176.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	94.9		94.9		67.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	50.4		50.4		35
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	28		28		12.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	9		9		10.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	12.3		12.3		3.3
Financing Receivable, Excluding Accrued Interest, Revolving	395.4		395.4		402.1
Less loans charged-off	0	(0.1)	0	(5.4)
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	1.8		1.8
Agricultural | Year One, Originated, Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Two, Originated, Fiscal Year Before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Three, Originated, Two Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Four, Originated, Three Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Year Five, Originated, Four Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Originated, More than Five Years before Current Fiscal Year
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Revolving
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Agricultural | Revolving, Converted to Term
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off			0
Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					3,153.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					812.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					737.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					548.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					281.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					179.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					574
Financing Receivable, Excluding Accrued Interest, Revolving					19.8
Less loans charged-off		0		(2.2)
Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					966.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					369.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					204.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					189
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					52.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					35
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					115.7
Financing Receivable, Excluding Accrued Interest, Revolving					1
Less loans charged-off		0		0
Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					2,249.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					527.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					370.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					219.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					132.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					124.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					178.1
Financing Receivable, Excluding Accrued Interest, Revolving					697.4
Less loans charged-off		(1.1)		(5.3)
Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					532.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					192
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					136
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					72
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					30.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					32.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					40.9
Financing Receivable, Excluding Accrued Interest, Revolving					28.9
Less loans charged-off		0		0
Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Less loans charged-off		(0.1)		(0.2)
Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					1,639.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					258.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					490.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					541.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					98.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					32.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					217.5
Financing Receivable, Excluding Accrued Interest, Revolving					0
Less loans charged-off		0		(0.1)
Consumer Home Equity and HELOC
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					548.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					24.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					8.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					5.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					5.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					5.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					16.4
Financing Receivable, Excluding Accrued Interest, Revolving					483
Land Acquisition And Development Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					386.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					159.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					117.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					29.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					17
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					11.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					29.1
Financing Receivable, Excluding Accrued Interest, Revolving					22.2
Less loans charged-off		$ 0		$ (2.7)
Pass | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					4,313.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1,162.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					861.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					661.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					467.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					241.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					890.4
Financing Receivable, Excluding Accrued Interest, Revolving					29.2
Pass | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	8,538.8		8,538.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	633.8		633.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,250		2,250
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1,728.7		1,728.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1,302		1,302
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	752.4		752.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1,784.9		1,784.9
Financing Receivable, Excluding Accrued Interest, Revolving	32		32
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	55		55
Pass | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					515.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					118.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					119.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					5.8
Financing Receivable, Excluding Accrued Interest, Revolving					270.1
Pass | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					964.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					442.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					374.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					89.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					45.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					10.6
Pass | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	1,779.7		1,779.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	237.6		237.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	822.7		822.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	502.2		502.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	49.6		49.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	17.8		17.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	40		40
Financing Receivable, Excluding Accrued Interest, Revolving	96.2		96.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	13.6		13.6
Pass | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	678.1		678.1		710.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	35.9		35.9		180
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	143.1		143.1		172.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	163		163		109.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	102.9		102.9		64.8
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	60.7		60.7		46.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	143.3		143.3		105.1
Financing Receivable, Excluding Accrued Interest, Revolving	28.8		28.8		31.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.4		0.4
Pass | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	2,856.2		2,856.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	289.2		289.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	577.9		577.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	422.6		422.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	247.1		247.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	127		127
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	344.7		344.7
Financing Receivable, Excluding Accrued Interest, Revolving	811.6		811.6
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	36.1		36.1
Pass | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	614.7		614.7		616.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	50.9		50.9		127.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	92.8		92.8		59.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	48.3		48.3		31.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	26.3		26.3		10.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	8.3		8.3		8.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	10.8		10.8		3.1
Financing Receivable, Excluding Accrued Interest, Revolving	375.9		375.9		375.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	1.4		1.4
Pass | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					3,047.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					793
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					718.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					533.9
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					266.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					165.8
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					551.3
Financing Receivable, Excluding Accrued Interest, Revolving					18.2
Pass | Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					964.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					369.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					204.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					189
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					52.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					35
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					113.7
Financing Receivable, Excluding Accrued Interest, Revolving					1
Pass | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					2,122.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					501.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					358.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					214.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					124.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					120.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					171.1
Financing Receivable, Excluding Accrued Interest, Revolving					631.6
Pass | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					524.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					191.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					134.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					69.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					30.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					29.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					39.5
Financing Receivable, Excluding Accrued Interest, Revolving					28.9
Pass | Land Acquisition And Development Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					374.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					152.5
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					114.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					29.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					17
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					10.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					28.4
Financing Receivable, Excluding Accrued Interest, Revolving					22.2
Other Assets Especially Mentioned | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					22.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					6.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					2.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					4.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					7.4
Financing Receivable, Excluding Accrued Interest, Revolving					0
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	135.6		135.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4		4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	9.3		9.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	20.1		20.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	5.8		5.8
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	25.5		25.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	69.1		69.1
Financing Receivable, Excluding Accrued Interest, Revolving	1.8		1.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					36.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					2.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					23.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					11.3
Other Assets Especially Mentioned | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	14.6		14.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	8.6		8.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.1		0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2.7		2.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.2		0.2
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	3		3
Other Assets Especially Mentioned | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	29.8		29.8		51.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	2.6		2.6		22.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.8		0.8		0.7
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1.2		1.2		1.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	2		2		2.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	1.7		1.7		10
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	12.6		12.6		3.2
Financing Receivable, Excluding Accrued Interest, Revolving	8.9		8.9		11
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	34.7		34.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.9		0.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	4.2		4.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	10.5		10.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	4.2		4.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	2.3		2.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1.5		1.5
Financing Receivable, Excluding Accrued Interest, Revolving	11		11
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.1		0.1
Other Assets Especially Mentioned | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	6.3		6.3		56.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.8		0.8		26.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1		1		2.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.7		0.7		0.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.3		0.3		1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.2		0.2		0.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.2		0.2		0
Financing Receivable, Excluding Accrued Interest, Revolving	2.9		2.9		26.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.2		0.2
Other Assets Especially Mentioned | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					55.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					10.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					14.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					12.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					6.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					5.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					5.5
Financing Receivable, Excluding Accrued Interest, Revolving					1.1
Other Assets Especially Mentioned | Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					1.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					1.7
Financing Receivable, Excluding Accrued Interest, Revolving					0
Other Assets Especially Mentioned | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					52.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					15.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					6.8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					1.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					4.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					4.9
Financing Receivable, Excluding Accrued Interest, Revolving					18.5
Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					5.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					1.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					2.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					1.4
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Revolving					0
Other Assets Especially Mentioned | Land Acquisition And Development Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					7.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					6.7
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Revolving					0
Substandard | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					72.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					13.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					10.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					18.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					19.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					9.8
Financing Receivable, Excluding Accrued Interest, Revolving					0
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	127.5		127.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	3		3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	26.5		26.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	28.4		28.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	9.6		9.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	29.2		29.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	30.1		30.1
Financing Receivable, Excluding Accrued Interest, Revolving	0.4		0.4
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.3		0.3
Substandard | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					0.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Revolving					0
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					41.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					16.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					24.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					0
Substandard | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	28.3		28.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	3		3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	24.5		24.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.2		0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.1		0.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.5		0.5
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Substandard | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	46.8		46.8		32.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	8		8		1.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	20.7		20.7		12.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	4.8		4.8		3.5
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1.2		1.2		0.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.5		0.5		2.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	11.6		11.6		11.3
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	106.3		106.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4		4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	21.9		21.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	8.4		8.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	3.1		3.1
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	4.7		4.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5.9		5.9
Financing Receivable, Excluding Accrued Interest, Revolving	58.3		58.3
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Substandard | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	66.6		66.6		33
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	44.5		44.5		22.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.1		1.1		4.6
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1		1		2.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1.4		1.4		0.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.5		0.5		1.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	1.3		1.3		0.2
Financing Receivable, Excluding Accrued Interest, Revolving	16.6		16.6		0.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.2		0.2
Substandard | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					48.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					8.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					2.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					8.9
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					8.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					17.2
Financing Receivable, Excluding Accrued Interest, Revolving					0.5
Substandard | Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					0.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Revolving					0
Substandard | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					72.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					9.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					3.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					3.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					3.4
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					3.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					2.1
Financing Receivable, Excluding Accrued Interest, Revolving					47.2
Substandard | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					1.2
Financing Receivable, Excluding Accrued Interest, Revolving					0
Substandard | Land Acquisition And Development Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					0.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Revolving					0
Doubtful | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	12		12
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	10.6		10.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1.4		1.4
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Doubtful | Total construction loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	13.9		13.9
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	13.9		13.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Doubtful | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	1		1		1.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0		1.3
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	1		1		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Doubtful | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	5.5		5.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	4.2		4.2
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	1.2		1.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0.1		0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Doubtful | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	0.4		0.4		0.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0		0.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.4		0.4		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Doubtful | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					1.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					1.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					0
Doubtful | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					1.7
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					1.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					0.1
Doubtful | Land Acquisition And Development Construction Financing Receivable [Member]
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					3.2
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					3.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Revolving					0
Performing | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	2,190		2,190
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	33.4		33.4
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	299.5		299.5
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	507.7		507.7
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	523		523
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	96.9		96.9
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	240.4		240.4
Financing Receivable, Excluding Accrued Interest, Revolving	476.6		476.6
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	12.5		12.5
Performing | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	760.6		760.6		826.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	86.7		86.7		380.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	321.2		321.2		176.4
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	142.8		142.8		130
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	103.6		103.6		59.7
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	44.7		44.7		33.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	61.6		61.6		46.3
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Performing | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	143.7		143.7		152.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	23.9		23.9		52.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	41.4		41.4		31.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	24.2		24.2		18.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	12.8		12.8		8.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	5.4		5.4		6.5
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	8.3		8.3		8.9
Financing Receivable, Excluding Accrued Interest, Revolving	27.4		27.4		25.8
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0.3		0.3
Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	71.6		71.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		177.3
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	71.6		71.6
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Performing | Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					1,634.6
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					258.9
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					490.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					541.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					98
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					32
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					213.8
Financing Receivable, Excluding Accrued Interest, Revolving					0
Performing | Consumer Home Equity and HELOC
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					546.1
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					23.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					8
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					5.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					5.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					5.6
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					15.2
Financing Receivable, Excluding Accrued Interest, Revolving					482.8
Nonperforming | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	8.3		8.3
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.1		0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.9		0.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.8		0.8
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.6		0.6
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.7		0.7
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	5		5
Financing Receivable, Excluding Accrued Interest, Revolving	0.2		0.2
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Nonperforming | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	3.3		3.3		3.4
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0.1		0.1		1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	1.3		1.3		0.9
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.8		0.8		0.6
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0.4		0.4		0.3
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0.2		0.2		0.2
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.5		0.5		0.4
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Nonperforming | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	0.3		0.3		0.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		0.1
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0.1		0.1		0.1
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0.1		0.1		0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0.1		0.1		0.1
Financing Receivable, Excluding Accrued Interest, Revolving	0		0		0.1
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	0		0
Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total	0.5		0.5
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year	0		0		0.8
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year	0		0
Financing Receivable, Excluding Accrued Interest, Revolving	0.5		0.5
Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan	$ 0		$ 0
Nonperforming | Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					4.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0.1
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0.5
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					3.7
Financing Receivable, Excluding Accrued Interest, Revolving					0
Nonperforming | Consumer Home Equity and HELOC
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total					2.8
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.6
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year					0.3
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year					0.2
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year					0.1
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year					1.2
Financing Receivable, Excluding Accrued Interest, Revolving					0.2
Agriculture Portfolio Segment [Member] | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1.9
Agriculture Portfolio Segment [Member] | Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					1.9
Agriculture Portfolio Segment [Member] | Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0
Commercial | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					100.3
Commercial | Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					100
Commercial | Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					0.3
Total consumer loans | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					75.9
Total consumer loans | Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					75.4
Total consumer loans | Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year					$ 0.5

Loans Held for Investment - S_6

Loans Held for Investment - Schedule of PCD Loans (Details) $ in Millions	Feb. 01, 2022 USD ($)
Receivables [Abstract]
Purchase price (initial fair value)	$ 623.3
Allowance for credit losses	(298.2)
Non-credit discount at acquisition	57.7
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	59.5
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Difference Between Amortized Cost Basis And Unpaid Principal Balance	39.6
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Interest Applied To Principal	$ 18.1

Loans Held for Investment - S_7

Loans Held for Investment - Schedule of Recorded Investment in Impaired Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	$ (11.7)	$ 1.7	$ (26.9)	$ (59.6)
Accounts Receivable, Allowance for Credit Loss	224.6	220.4	224.6	220.4	$ 226.1	$ 220.1	$ 247.2	$ 122.3
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	9.9	(1.7)	22.1	55.6
Impaired Financing Receivable, Interest Income, Accrual Method	0	0	0	0
Total real estate
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	(20.4)	11.2	(33.8)	(27.3)
Accounts Receivable, Allowance for Credit Loss	158.7	133.7	158.7	133.7	147.5	138.7	169.6	69.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,604.4		13,604.4			13,456.2
Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	4.5	(2.4)	5.3	(21.5)
Accounts Receivable, Allowance for Credit Loss	49.5	59.9	49.5	59.9	54.4	54.9	58.2	31.6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,002.7		3,002.7			2,882.6
Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense	(0.2)	(6.3)	0.9	(5.8)
Accounts Receivable, Allowance for Credit Loss	2.7	6.5	2.7	6.5	$ 2.4	3.2	(1)	0.3
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	688		688			708.3
Owner occupied
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		(1.4)		(6)
Accounts Receivable, Allowance for Credit Loss		26.6		26.6			25.2	13.3
Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		10.3		(12.4)
Accounts Receivable, Allowance for Credit Loss		89.5		89.5			125	43.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	8,813.9		8,813.9			8,528.6
Residential construction
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		(0.1)		(1)
Accounts Receivable, Allowance for Credit Loss		3.4		3.4			3.3	2.4
Commercial construction
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		(4.7)		(8.7)
Accounts Receivable, Allowance for Credit Loss		14.9		14.9			10.2	6
Total construction
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		(5)		(9.1)
Accounts Receivable, Allowance for Credit Loss		19.1		19.1			14	8.9
Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		0.7		(4.5)
Accounts Receivable, Allowance for Credit Loss		18.2		18.2			18.7	13.4
Residential
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		0.8		(4.5)
Accounts Receivable, Allowance for Credit Loss		19.7		19.7			20.1	14.6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,198.3		2,198.3			2,188.3
Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Provision charged to operating expense		5.1		(1.3)
Accounts Receivable, Allowance for Credit Loss		$ 5.4		$ 5.4			$ 10.5	$ 1.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	755.7		755.7			794.9
Total construction loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,836.5		1,836.5			1,944.4
Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	63.5		63.5			39.1
Collateral [Member] | Total real estate
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	55.9		55.9			27.2
Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	6.9		6.9			4.6
Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0.7		0.7			7.3
Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	33.9		33.9			17.5
Collateral [Member] | Residential
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0.5		0.5			0.5
Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3.7		3.7			6
Collateral [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	17.8		17.8			3.2
Business Assets [Member] | Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3.2		3.2			7.1
Business Assets [Member] | Collateral [Member] | Total real estate
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1.6		1.6			1.9
Business Assets [Member] | Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1.4		1.4			3.1
Business Assets [Member] | Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0.2		0.2			2.1
Business Assets [Member] | Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1.6		1.6			1.7
Business Assets [Member] | Collateral [Member] | Residential
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0			0
Business Assets [Member] | Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0			0.2
Business Assets [Member] | Collateral [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0			0
Real Property [Member] | Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	60.3		60.3			32
Real Property [Member] | Collateral [Member] | Total real estate
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	54.3		54.3			25.3
Real Property [Member] | Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	5.5		5.5			1.5
Real Property [Member] | Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0.5		0.5			5.2
Real Property [Member] | Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	32.3		32.3			15.8
Real Property [Member] | Collateral [Member] | Residential
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0.5		0.5			0.5
Real Property [Member] | Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3.7		3.7			5.8
Real Property [Member] | Collateral [Member] | Total construction loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 17.8		$ 17.8			$ 3.2

Loans Held for Investment - Nar

Loans Held for Investment - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Receivables [Abstract]
Commitments to purchase or sell	$ 0	$ 0	$ 0	$ 0
Proceeds from sale of loans held-for-investment	0	$ 0	0	$ 0
Interest Receivable	$ 119,100,000		$ 119,100,000		$ 118,300,000
Allowance for Credit Losses					$ 0

Loans Held for Investment - S_8

Loans Held for Investment - Schedule of Modifications to Borrowers (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Modifications to Borrowers [Line Items]
Interest Receivable	$ 119.1	$ 119.1	$ 118.3
Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	1.7
Financing Receivable, Excluding Accrued Interest, Modified Period	40	65.9
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension	$ 40	$ 64.2
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent	0.22%	0.36%
Interest Receivable	$ 0.9	$ 0.9
Financing Receivable, Loan in Process	0.2	0.2
Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	1.6
Agricultural
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	12	12	7.2
Agricultural | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness		0
Financing Receivable, Excluding Accrued Interest, Modified Period		1.1
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension		$ 1.1
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent		0.15%
Agricultural | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness		$ 0
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months		7 years 2 months 12 days
Agricultural
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	1.8	$ 1.8	3.1
Agricultural | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	0
Financing Receivable, Excluding Accrued Interest, Modified Period	19.6	36.6
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension	$ 19.6	$ 36.6
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent	2.85%	5.32%
Agricultural | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months	8 years 10 months 24 days	9 years 2 months 12 days
Other, including overdrafts
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	$ 0	$ 0	0
Commercial
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	4.2	4.2	7.5
Commercial | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	1.6
Financing Receivable, Excluding Accrued Interest, Modified Period	13.9	19
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension	$ 13.9	$ 17.4
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent	0.16%	0.22%
Commercial | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 1.3
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months	6 years 4 months 24 days	6 years 4 months 24 days
Total construction loans
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	$ 14.5	$ 14.5	11.6
Total construction loans | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness		0
Financing Receivable, Excluding Accrued Interest, Modified Period		0.1
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension		$ 0.1
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent		0.01%
Total construction loans | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness		$ 0
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months		12 years 4 months 24 days
Residential
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	3.9	$ 3.9	13.2
Residential | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	0.1
Financing Receivable, Excluding Accrued Interest, Modified Period	0.1	0.3
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension	$ 0.1	$ 0.2
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent	0%	0.01%
Residential | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 0.3
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months	16 years 2 months 12 days	19 years 6 months
Total real estate
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	$ 34.6	$ 34.6	39.5
Total real estate | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	1.7
Financing Receivable, Excluding Accrued Interest, Modified Period	14	20.5
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension	$ 14	$ 18.8
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent	0.10%	0.15%
Total real estate | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 1.6
Commercial
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	8	8	10.9
Commercial | Borrowers in Financial Distress
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	0	0
Financing Receivable, Excluding Accrued Interest, Modified Period	6.4	8.8
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension	$ 6.4	$ 8.8
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent	0.21%	0.29%
Commercial | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months	8 years 3 months 18 days	9 years
Indirect consumer
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	$ 9.1	$ 9.1	12.3
Indirect consumer | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months	7 years	8 years 3 months 18 days
Direct and advance lines
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	$ 1.2	$ 1.2	1.2
Direct and advance lines | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 0
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months	8 years	8 years
Credit Card Receivable [Member]
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	$ 1.5	$ 1.5	1.8
Total consumer loans
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Loan in Process	11.8	11.8	$ 15.3
Total consumer loans | Borrowers in Financial Difficulty
Financing Receivable, Modifications to Borrowers [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified Period, Principal Forgiveness	$ 0	$ 0

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Repossessed Assets [Abstract]
Balance at beginning of year	$ 13.4	$ 17.5	$ 12.7	$ 2
OREO acquired through acquisitions	0	0	0	15.8
Additions	1.7	0.1	2.5	0.1
Write-down of OREO	(0.7)	0	(0.8)	0
Dispositions	0	(0.8)	0	(1.1)
Balance at end of year	$ 14.4	$ 16.8	$ 14.4	$ 16.8

Other Real Estate Owned - Narra

Other Real Estate Owned - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Balance at beginning of year
Carrying values of foreclosed residential real estate properties	$ 1.1
Consumer mortgage loans collateralized by residential real estate property in the process of foreclosure	$ 0.4	$ 0

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	$ 1,659.1	$ 2,290.7
Derivative Asset, Estimated Fair Value	40.2	45.2
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	2,914.5	2,449
Derivative Liabilities, Estimated Fair Value	163.1	159.6
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	1,645.7	1,728.1
Derivative Asset, Estimated Fair Value	40.2	41.6
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,645.7	1,728.1
Derivative Liabilities, Estimated Fair Value	148.3	153.9
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	15.1	14.8
Derivative Liabilities, Estimated Fair Value	0.1	0
Not Designated as Hedging Instrument | Forward loan sales contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	13.4	12.6
Designated as Hedging Instrument [Member] | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	0	550
Derivative Asset, Estimated Fair Value	0	3.5
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	850	300
Derivative Liabilities, Estimated Fair Value	$ 7.7	$ 0.3

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financial Assets
Gross Amounts Recognized	$ 40.2		$ 40.2		$ 45.2
Gross Amounts Offset in the Balance Sheet	0		0		0
Net Amounts in the Balance Sheet	40.2		40.2		45.2
Financial Instruments	0		0		0
Fair Value of Financial Collateral in the Balance Sheet	36.4		36.4		45.1
Net Amount	3.8		3.8		0.1
Financial Liabilities
Gross Amounts Recognized	163.1		163.1		159.6
Gross Amounts Offset in the Balance Sheet	0		0		0
Net Amounts in the Balance Sheet	163.1		163.1		159.6
Financial Instruments	0		0		0
Fair Value of Financial Collateral in the Balance Sheet	0		0		0
Net Amount	163.1		163.1		159.6
Repurchase agreements
Gross Amounts Recognized	929.9		929.9		1,052.9
Gross Amounts Offset in the Balance Sheet	0		0		0
Net Amounts in the Balance Sheet	929.9		929.9		1,052.9
Financial Instruments	0		0		0
Fair Value of Financial Collateral in the Balance Sheet	929.9		929.9		1,052.9
Net Amount	0		0		0
Total assets and liabilities
Gross Amounts Recognized	1,093		1,093		1,212.5
Gross Amounts Offset in the Balance Sheet	0		0		0
Net Amounts in the Balance Sheet	1,093		1,093		1,212.5
Financial Instruments	0		0		0
Fair Value of Financial Collateral in the Balance Sheet	929.9		929.9		1,052.9
Net Amount	163.1		163.1		159.6
Derivative Liability, Notional Amount	2,914.5		2,914.5		2,449
Not Designated as Hedging Instrument
Total assets and liabilities
Amount of net gains recognized in mortgage banking revenues	0.2	$ 1	0.2	$ 1.5
Interest Rate Swap
Financial Assets
Gross Amounts Recognized	40.2		40.2		45.1
Gross Amounts Offset in the Balance Sheet	0		0		0
Net Amounts in the Balance Sheet	40.2		40.2		45.1
Financial Instruments	0		0		0
Fair Value of Financial Collateral in the Balance Sheet	36.4		36.4		45.1
Net Amount	3.8		3.8		0
Financial Liabilities
Gross Amounts Recognized	163		163		159.6
Gross Amounts Offset in the Balance Sheet	0		0		0
Net Amounts in the Balance Sheet	163		163		159.6
Financial Instruments	0		0		0
Fair Value of Financial Collateral in the Balance Sheet	0		0		0
Net Amount	163		163		159.6
Interest Rate Swap | Not Designated as Hedging Instrument
Total assets and liabilities
Derivative Liability, Notional Amount	1,645.7		1,645.7		1,728.1
Mortgage Related Derivatives
Financial Assets
Gross Amounts Recognized					0.1
Gross Amounts Offset in the Balance Sheet					0
Net Amounts in the Balance Sheet					0.1
Financial Instruments					0
Fair Value of Financial Collateral in the Balance Sheet					0
Net Amount					0.1
Risk Participation Agreements | Not Designated as Hedging Instrument
Total assets and liabilities
Derivative Liability, Notional Amount	103.7		103.7		106.1
Interest Rate Lock Commitments
Financial Liabilities
Gross Amounts Recognized	0.1		0.1
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts in the Balance Sheet	0.1		0.1
Financial Instruments	0		0
Fair Value of Financial Collateral in the Balance Sheet	0		0
Net Amount	0.1		0.1
Interest Rate Lock Commitments | Not Designated as Hedging Instrument
Total assets and liabilities
Derivative Liability, Notional Amount	$ 15.1		$ 15.1		$ 14.8

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 12.2		$ 12.2
Derivative Instruments and Hedges, Assets	192.6		192.6		$ 191.9
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	7.4		7.4		8.1
Financial Instruments	0		0		0
Derivative Asset, Notional Amount	1,659.1		1,659.1		2,290.7
Derivative Asset, Estimated Fair Value	40.2		40.2		45.2
Derivative Liability, Notional Amount	2,914.5		2,914.5		2,449
Derivative Liabilities, Estimated Fair Value	163.1		163.1		159.6
Collateral Pledged
Derivative [Line Items]
Derivative, Fair Value, Net	0		0
Financial Instruments	0		0
Not Designated as Hedging Instrument
Derivative [Line Items]
Amount of net fee income recognized in other non-interest income	0.5	$ 1.1	6.5	$ 3.1
Amount of net gains recognized in mortgage banking revenues	0.2	1	0.2	1.5
Interest Rate Swap
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	850		850
Financial Instruments	0		0		0
Interest Rate Swap | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	0		0		550
Derivative Asset, Estimated Fair Value	0		0		3.5
Derivative Liability, Notional Amount	850		850		300
Derivative Liabilities, Estimated Fair Value	7.7		7.7		0.3
Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Notional Amount	1,645.7		1,645.7		1,728.1
Derivative Asset, Estimated Fair Value	40.2		40.2		41.6
Derivative Liability, Notional Amount	1,645.7		1,645.7		1,728.1
Derivative Liabilities, Estimated Fair Value	148.3		148.3		153.9
Risk Participation Agreements | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Notional Amount	103.7		103.7		106.1
Derivative Liabilities, Estimated Fair Value	0		0		0
Forward Contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Fair Value, Net	0		0		0.1
Derivative Asset, Notional Amount	13.4		13.4		12.6
Interest Rate Lock Commitments
Derivative [Line Items]
Financial Instruments	0		0
Interest Rate Lock Commitments | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Notional Amount	15.1		15.1		14.8
Derivative Liabilities, Estimated Fair Value	0.1		0.1		0
Interest Rate Collars
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	300		300
Interest Rate Collars | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount	300		300		300
Derivative Liabilities, Estimated Fair Value	7		7		$ 5.4
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	$ (14.7)	$ 0	$ (14.7)	$ 0

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Sep. 30, 2022
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	$ 192.6		$ 192.6		$ 191.9
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	7.4		7.4		$ 8.1
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	12.2		12.2
Derivative Instruments and Hedges, Noncurrent	600		600
Interest Income
Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	0	$ 0	0	$ 0
Interest Rate Swap
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	850		850
Interest Rate Swap | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(14.7)	$ 0	(14.7)	$ 0
Interest Rate Collars
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	300		300
Interest Rate Swap and Interest Rate Collar
Derivative [Line Items]
Derivative Instruments and Hedges, Assets	$ 1,150		$ 1,150
three-year forward starting, four-year pay fixed interest rate swap [Member]
Derivative [Line Items]
Derivative Instruments and Hedges, Assets						$ 200
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)						$ 8.5

Capital Stock (Details)

Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Class of Stock [Line Items]
Shares outstanding (in shares)		105,020,683		105,020,683		104,442,023
Common shares issued (in shares)		54,414	26,266	54,414	46,913,370
Stock repurchased and retired (in shares)		348	1,722,044	55,428	1,759,742
Stock Repurchased and Retired During Period, Value		$ 0	$ 64.5	$ 1.8	$ 65.9
Common Stock, Shares, Issued		105,020,683		105,020,683		104,442,023
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized		2,000,000		2,000,000
Accelerated Share Repurchases, Adjustment to Recorded Amount					$ 64.3
Shares repurchased, average cost per share (in dollars per share)					$ 37.38
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)						104,442,023
Stock repurchased and retired (in shares)					1,720,700
Common Stock, Shares, Issued						104,442,023
Class A Common Stock | Great Western Bank
Class of Stock [Line Items]
Number of shares issued as consideration (in shares)	46,900,000
Director [Member]
Class of Stock [Line Items]
Common shares issued (in shares)				54,414
Director [Member] | Class A Common Stock
Class of Stock [Line Items]
Dividend, Share-based Payment Arrangement, Paid-in-Kind				$ 1.2

Earnings per Common Share (Deta

Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 67	$ 64.1	$ 123.3	$ 30.7
Weighted average common shares outstanding for basic earnings per share computation (in shares)	103,820,649	109,106,891	103,779,386	101,025,926
Dilutive effects of stock-based compensation (in shares)	2,242	24,827	42,539	50,405
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	103,822,891	109,131,718	103,821,925	101,076,331
Basic earnings per common share (in dollars per share)	$ 0.65	$ 0.59	$ 1.19	$ 0.30
Diluted earnings per common share (in dollars per share)	$ 0.65	$ 0.59	$ 1.19	$ 0.30
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	222,417	218,033	129,449	61,058
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)			974,875	500,573

Regulatory Capital (Details)

Regulatory Capital (Details) $ in Millions	Jan. 01, 2020 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained Earnings (Accumulated Deficit)		$ 1,098.8	$ 1,072.7
Total risk-based capital:
Actual, Amount		$ 2,925.7	$ 2,875.8
Actual, Ratio		0.1290	0.1248
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,815.1	$ 1,843.2
Minimum Required for Capital Adequacy Purposes, Ratio		0.0800	0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 2,382.3	$ 2,419.2
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		10.50%	10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 2,268.9	$ 2,304
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.1000	0.1000
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum		$ 1,021	$ 1,036.8
Tier 1 risk-based capital:
Actual, Amount		$ 2,440.5	$ 2,408.8
Actual, Ratio		0.1076	0.1045
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,361.3	$ 1,382.4
Minimum Required for Capital Adequacy Purposes, Ratio		0.0600	0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,928.5	$ 1,958.4
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		8.50%	8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,815.1	$ 1,843.2
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0800	0.0800
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum		0.0650	0.0650
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum		0.0450	0.0450
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.1076	0.1045
Banking Regulation, Common Equity Tier One Risk-Based Capital, Well Capitalized, Minimum		$ 1,474.8	$ 1,497.6
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual		2,440.5	2,408.8
Common equity tier 1 risk-based capital:
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,588.2	$ 1,612.8
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		7%	7%
Leverage capital ratio:
Actual, Amount		$ 2,440.5	$ 2,408.8
Actual, Ratio		0.0799	0.0775
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum		$ 1,222.3	$ 1,242.9
Capital Adequacy Purposes and Conservation Buffer, Ratio		0.0400	0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,527.8	$ 1,553.6
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		$ 2,759.2	$ 2,713.5
Actual, Ratio		0.1218	0.1180
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,812.7	$ 1,839.6
Minimum Required for Capital Adequacy Purposes, Ratio		0.0800	0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 2,379.2	$ 2,414.5
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		10.50%	10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 2,265.9	$ 2,299.5
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.1000	0.1000
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum		$ 1,019.7	$ 1,034.8
Tier 1 risk-based capital:
Actual, Amount		$ 2,530.9	$ 2,504.1
Actual, Ratio		0.1117	0.1089
Minimum Required for Capital Adequacy Purposes, Amount		$ 1,359.6	$ 1,379.7
Minimum Required for Capital Adequacy Purposes, Ratio		0.0600	0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,926	$ 1,954.6
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		8.50%	8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,812.7	$ 1,839.6
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0800	0.0800
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum		0.0650	0.0650
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum		0.0450	0.0450
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual		0.1117	0.1089
Banking Regulation, Common Equity Tier One Risk-Based Capital, Well Capitalized, Minimum		$ 1,472.9	$ 1,494.7
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual		2,530.9	2,504.1
Common equity tier 1 risk-based capital:
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,586.1	$ 1,609.7
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		7%	7%
Leverage capital ratio:
Actual, Amount		$ 2,530.9	$ 2,504.1
Actual, Ratio		0.0829	0.0807
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum		$ 1,220.6	$ 1,241.1
Capital Adequacy Purposes and Conservation Buffer, Ratio		0.0400	0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,525.8	$ 1,551.4
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0500	0.0500

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Shares outstanding (in shares)	105,020,683	104,442,023
Class A Common Stock
Loss Contingencies [Line Items]
Shares outstanding (in shares)		104,442,023
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	$ 8.4

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Entity Information [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 20.8	$ 6.2	$ 20.8	$ 6.2	$ 17.8	$ 16.2	$ 6.2	$ 3.8
Provision for credit loss expense	(9.9)	1.7	(22.1)	(55.6)
Credit Extension Commitments	4,711.7		4,711.7			5,173.3
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	809.7		809.7			827.6
Standby Letter of Credit
Entity Information [Line Items]
Credit Extension Commitments	96.7		96.7			$ 93.8
Cumulative effect, period of adoption, adjusted balance
Entity Information [Line Items]
Provision for credit loss expense	$ 3	$ 0	$ 4.6	$ 2.4

Other Comprehensive Income_Lo_3

Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investment securities available-for sale:
Change in net unrealized gain during period, pre-tax	$ (57.5)	$ (161.6)	$ 20.7	$ (414.2)
Change in net unrealized gain during period, tax expense (benefit)	(14.4)	(45.2)	5.2	(107.9)
Change in net unrealized gain during period, net of tax	(43.1)	(116.4)	15.5	(306.3)
Reclassification adjustment for net gains included in income, pre-tax	0.1	0.1	23.5	0.2
Reclassification adjustment for net gains included in income, tax expense (benefit)	0	0	5.8	0
Reclassification adjustment for net gains included in income, net of tax	0.1	0.1	17.7	0.2
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, net of tax			7.2	0.2
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, tax			1.8	(0.1)
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, pre-tax			5.4	(0.1)
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, pre-tax	(0.4)	(0.9)	(0.8)	(23.9)
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit)	(0.1)	(0.2)	(0.2)	(5.9)
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, net of tax	(0.3)	(0.7)	(0.6)	(18)
Unrealized loss on derivatives, pre-tax	(22.1)	(15)	(12.1)	6.3
Unrealized loss on derivatives, tax expense (benefit)	(5.5)	(4.2)	(3)	1.1
Unrealized loss on derivatives, net of tax	(16.6)	(10.8)	(9.1)	5.2
Other comprehensive (loss) income, before tax	(79.9)	(177.4)	24.1	(431.4)
Other Comprehensive Income (Loss), tax expense (benefit)	(20)	(49.6)	6	(112.6)
Other Comprehensive Income (Loss), Net of Tax	$ (59.9)	$ (127.8)	$ 18.1	$ (318.8)

Other Comprehensive Income_Lo_4

Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	$ 3,121.2	$ 3,271.9	$ 3,121.2	$ 3,271.9	$ 3,073.8	$ 3,160.3	$ 3,441.1	$ 1,986.6
Net unrealized gain (loss) on derivatives	(16.6)	(10.8)	(9.1)	5.2
Change in net unrealized gain during period, pre-tax	(57.5)	(161.6)	20.7	(414.2)
Change in net unrealized gain during period, tax expense (benefit)	(14.4)	(45.2)	5.2	(107.9)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	(43.1)	(116.4)	15.5	(306.3)
Reclassification adjustment for net losses included in income	0.1	0.1	23.5	0.2
Reclassification adjustment for net gains included in income, tax expense (benefit)	0	0	5.8	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.1	0.1	17.7	0.2
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	(0.4)	(0.9)	(0.8)	(23.9)
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit)	(0.1)	(0.2)	(0.2)	(5.9)
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax	(0.3)	(0.7)	(0.6)	(18)
Unrealized loss on derivatives, pre-tax	(22.1)	(15)	(12.1)	6.3
Unrealized loss on derivatives, tax expense (benefit)	(5.5)	(4.2)	(3)	1.1
Other comprehensive (loss) income, before tax	(79.9)	(177.4)	24.1	(431.4)
Other Comprehensive Income (Loss), tax expense (benefit)	(20)	(49.6)	6	(112.6)
Other Comprehensive Income (Loss), Net of Tax	(59.9)	(127.8)	18.1	(318.8)
Net unrealized loss on investment securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	(443.2)		(443.2)		(471)
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax			(5.2)		(4.5)
Net unrealized loss on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net unrealized gain (loss) on derivatives			(10.6)		(1.6)
Net accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total stockholders’ equity	$ (459)	$ (329.8)	$ (459)	$ (329.8)	$ (477.1)	$ (399.1)	$ (202)	$ (11)

Fair Value Measurements - Sched

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		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
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
Derivative assets	40.2		40.2		$ 45.2
Derivative liabilities	163.1		163.1		159.6
Write downs	(0.7)	$ 0	(0.8)	$ 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
Deferred compensation plan assets	0		0		0
Deferred compensation plan liabilities	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	11		11		6.9
Deferred compensation plan assets	18.4		18.4		18.7
Deferred compensation plan liabilities	18.4		18.4		18.7
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	7.4		7.4		5.5
Deferred compensation plan assets	0		0		0
Deferred compensation plan liabilities	0		0		0
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	0		0		0
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	219.1		219.1		642.7
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
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
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	214.9		214.9		263.7
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
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
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	172		172		198.9
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
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
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	217.1		217.1		228
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
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
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	227.5		227.5		241.5
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
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
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
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	63.5		63.5		39.1
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
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	1,124.3		1,124.3		1,111.6
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
Commercial 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
Commercial 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	1,102.4		1,102.4		1,351.2
Commercial 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
Residential 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
Residential 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	1,375.4		1,375.4		1,558.3
Residential 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
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
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	1,205.2		1,205.2		1,350.2
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
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	5,857.9		5,857.9		6,946.1
Derivative assets	40.2		40.2		45.2
Derivative liabilities	163.1		163.1		159.6
Deferred compensation plan assets	18.4		18.4		18.7
Deferred compensation plan liabilities	18.4		18.4		18.7
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	18.4		18.4		12.4
Deferred compensation plan assets	18.4		18.4		18.7
Deferred compensation plan liabilities	18.4		18.4		18.7
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	0		0		0
Derivative assets	0		0		0
Derivative liabilities	0		0		0
Deferred compensation plan assets	0		0		0
Deferred compensation plan liabilities	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	5,857.9		5,857.9		6,946.1
Derivative assets	40.2		40.2		45.2
Derivative liabilities	163.1		163.1		159.6
Deferred compensation plan assets	18.4		18.4		18.7
Deferred compensation plan liabilities	18.4		18.4		18.7
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
Derivative assets	0		0		0
Derivative liabilities	0		0		0
Deferred compensation plan assets	0		0		0
Deferred compensation plan liabilities	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	219.1		219.1		642.7
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	214.9		214.9		263.7
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	172		172		198.9
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	217.1		217.1		228
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	227.5		227.5		241.5
Estimated Fair Value | Collateral-dependent loans | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	63.5		63.5		39.1
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	1,124.3		1,124.3		1,111.6
Estimated Fair Value | Commercial 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	1,102.4		1,102.4		1,351.2
Estimated Fair Value | Residential 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	1,375.4		1,375.4		1,558.3
Estimated Fair Value | 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	1,205.2		1,205.2		1,350.2
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	5,857.9		5,857.9		6,946.1
Derivative assets	40.2		40.2		45.2
Derivative liabilities	163.1		163.1		159.6
Deferred compensation plan assets	18.4		18.4		18.7
Deferred compensation plan liabilities	18.4		18.4		18.7
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	63.5		63.5		39.1
Long-lived assets to be disposed of by sale	4.6		$ 4.6		$ 5.5
Long-Lived Assets Held-for-sale, Description			9.3 million		5.7 million
Change During Period | 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	4.7		$ 4.7		$ 0.2
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	40.2		40.2		45.1
Derivative liabilities	163		163		159.6
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
Derivative liabilities	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	40.2		40.2		45.1
Derivative liabilities	156		156		154.2
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
Derivative liabilities	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	40.2		40.2		45.1
Derivative liabilities	156		156		154.2
Interest Rate Lock Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0.1		0.1
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 liabilities	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 liabilities	0.1		0.1
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 liabilities	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 liabilities	0.1		0.1
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
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					0.1
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
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					0.1
Interest Rate Collars | 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
Derivative liabilities	0		0
Interest Rate Collars | 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					5.4
Derivative liabilities	7		7
Interest Rate Collars | 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
Derivative liabilities	0		0
Interest Rate Collars | 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					5.4
Derivative liabilities	7		7
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
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
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	4.6		4.6		5.5
Long-lived assets to be disposed of by sale | Estimated Fair Value | 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	$ 4.6		$ 4.6		$ 5.5

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Inputs, Quantitative Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Real Estate Acquired Through Foreclosure	$ 14.4	$ 16.8	$ 14.4	$ 16.8	$ 13.4	$ 12.7	$ 17.5	$ 2
Material write downs	0.7	$ 0	0.8	$ 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	63.5		63.5			39.1
Collateral-dependent loans | 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	63.5		63.5			39.1
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
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
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	$ 63.5		$ 63.5			39.1
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		0
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	0.45		0.45
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)		(0.07)
Other real estate owned | 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	$ 14.4		$ 14.4			12.7
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
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
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	$ 14.4		$ 14.4			12.7
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	0.15		0.15
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	0.36		0.36
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	(0.22)		(0.22)
Loans held for sale | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Financing Receivable, Held-for-Sale, Nor Part of Disposal Group, after Valuation Allowance, Fair Value Disclosure	$ 58.1		$ 58.1			67.5
Loans held for 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)
Financing Receivable, Held-for-Sale, Nor Part of Disposal Group, after Valuation Allowance, Fair Value Disclosure	0		0			0
Loans held for 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)
Financing Receivable, Held-for-Sale, Nor Part of Disposal Group, after Valuation Allowance, Fair Value Disclosure	0		0			0
Loans held for 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)
Financing Receivable, Held-for-Sale, Nor Part of Disposal Group, after Valuation Allowance, Fair Value Disclosure	$ 58.1		$ 58.1
Loans held for 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	0.11		0.11
Loans held for 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	0.23		0.23
Loans held for 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	(0.17)		(0.17)
Long-lived assets to be disposed of by sale | 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	$ 4.6		$ 4.6			5.5
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
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
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	$ 4.6		$ 4.6			$ 5.5
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		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	0.06		0.06
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	(0.03)		(0.03)

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financial assets:
Investment debt securities held-to-maturity	$ 2,924.7	$ 3,052.2
Derivative assets	40.2	45.2
Financial liabilities:
Derivative liabilities	163.1	159.6
Estimated Fair Value
Financial assets:
Cash and cash equivalents	680.5	870.5
Investment debt securities available-for-sale	5,857.9	6,946.1
Investment debt securities held-to-maturity	2,924.7	3,052.2
Accrued interest receivable	119.1	118.3
Mortgage servicing rights, net	38.2	37.4
Loans held for sale	76.5	79.9
Net loans held for investment	17,519.5	17,552.1
Derivative assets	40.2	45.2
Deferred compensation plan assets	18.4	18.7
Total financial assets	27,275	28,720.4
Financial liabilities:
Total deposits, excluding time deposits	20,836.8	23,145.2
Time deposits	2,695.4	1,876.1
Securities sold under repurchase agreements	929.9	1,052.9
Other Borrowings	2,589	2,327
Accrued interest payable	45.8	14.5
Long-term debt	112.3	116.3
Subordinated debentures held by subsidiary trusts	154	155.8
Derivative liabilities	163.1	159.6
Deferred compensation plan liabilities	18.4	18.7
Total financial liabilities	27,544.7	28,866.1
Carrying Amount
Financial assets:
Cash and cash equivalents	680.5	870.5
Investment debt securities available-for-sale	5,857.9	6,946.1
Investment debt securities held-to-maturity	3,317.7	3,451.8
Accrued interest receivable	119.1	118.3
Mortgage servicing rights, net	29.8	31.1
Loans held for sale	76.5	79.9
Net loans held for investment	18,038.8	17,879.1
Derivative assets	40.2	45.2
Deferred compensation plan assets	18.4	18.7
Total financial assets	28,178.9	29,440.7
Financial liabilities:
Total deposits, excluding time deposits	20,836.8	23,145.2
Time deposits	2,742.4	1,928.4
Securities sold under repurchase agreements	929.9	1,052.9
Other Borrowings	2,589	2,327
Accrued interest payable	45.8	14.5
Long-term debt	120.8	120.8
Subordinated debentures held by subsidiary trusts	163.1	163.1
Derivative liabilities	163.1	159.6
Deferred compensation plan liabilities	18.4	18.7
Total financial liabilities	27,609.3	28,930.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	680.5	870.5
Investment debt securities available-for-sale	0	0
Investment debt securities held-to-maturity	0	0
Accrued interest receivable	0	0
Mortgage servicing rights, net	0	0
Loans held for sale	0	0
Net loans held for investment	0	0
Derivative assets	0	0
Deferred compensation plan assets	0	0
Total financial assets	680.5	870.5
Financial liabilities:
Total deposits, excluding time deposits	20,836.8	23,145.2
Time deposits	0	0
Securities sold under repurchase agreements	0	0
Other Borrowings	0	0
Accrued interest payable	0	0
Long-term debt	0	0
Subordinated debentures held by subsidiary trusts	0	0
Derivative liabilities	0	0
Deferred compensation plan liabilities	0	0
Total financial liabilities	20,836.8	23,145.2
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment debt securities available-for-sale	5,857.9	6,946.1
Investment debt securities held-to-maturity	2,924.7	3,052.2
Accrued interest receivable	119.1	118.3
Mortgage servicing rights, net	38.2	37.4
Loans held for sale	11	6.9
Net loans held for investment	17,456	17,513
Derivative assets	40.2	45.2
Deferred compensation plan assets	18.4	18.7
Total financial assets	26,465.5	27,737.8
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	2,695.4	1,876.1
Securities sold under repurchase agreements	929.9	1,052.9
Other Borrowings	2,589	2,327
Accrued interest payable	45.8	14.5
Long-term debt	112.3	116.3
Subordinated debentures held by subsidiary trusts	154	155.8
Derivative liabilities	163.1	159.6
Deferred compensation plan liabilities	18.4	18.7
Total financial liabilities	6,707.9	5,720.9
Significant Unobservable Inputs (Level 3) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment debt securities available-for-sale	0	0
Investment debt securities held-to-maturity	0	0
Accrued interest receivable	0	0
Mortgage servicing rights, net	0	0
Loans held for sale	65.5	73
Net loans held for investment	63.5	39.1
Derivative assets	0	0
Deferred compensation plan assets	0	0
Total financial assets	129	112.1
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	0	0
Securities sold under repurchase agreements	0	0
Other Borrowings	0	0
Accrued interest payable	0	0
Long-term debt	0	0
Subordinated debentures held by subsidiary trusts	0	0
Derivative liabilities	0	0
Deferred compensation plan liabilities	0	0
Total financial liabilities	$ 0	$ 0

Other Borrowed Funds - Narrativ

Other Borrowed Funds - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Advance from Federal Home Loan Bank	$ 2,589	$ 2,327
5.01% fixed rate borrowings in tenors up to one-month
Advance from Federal Home Loan Bank	$ 450
Fixed-to-floating rate (percent)	5.39%
5.11% average fixed rate borrowings in tenors of 2-month
Advance from Federal Home Loan Bank	$ 600
Fixed-to-floating rate (percent)	5.38%
5.12% average fixed rate borrowings in tenors of 3-months
Advance from Federal Home Loan Bank	$ 150
Fixed-to-floating rate (percent)	5.56%
Notes Payable to FHLB | Subsidiaries | Federal Home Loan Bank Advances
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	$ 4,517.6
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	7,106.6
5.30% average fixed rate borrowings in tenors up to two-weeks
Advance from Federal Home Loan Bank	$ 553
Fixed-to-floating rate (percent)	5.30%
5.54% average fixed rate borrowings in tenors of 4-months
Advance from Federal Home Loan Bank	$ 400
Fixed-to-floating rate (percent)	5.54%
5.56% average fixed rate borrowings in tenors of 5-months
Advance from Federal Home Loan Bank	$ 436
Fixed-to-floating rate (percent)	5.56%

Subsequent Events (Details)

Subsequent Events (Details)	Jul. 25, 2023 $ / shares
Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Dividend amount per share (in dollars)	$ 0.47