First Interstate BancSystem (FIBK) 10-Q 11 May 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page	3 Months Ended
	Mar. 31, 2020shares
Document Information [Line Items]
Document Period End Date	Mar. 31, 2020
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-34653
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM, INC.
Entity Incorporation, State or Country Code	MT
Entity Tax Identification Number	81-0331430
Entity Address, Address Line One	401 North 31st Street
Entity Address, City or Town	Billings,
Entity Address, State or Province	MT
Entity Address, Postal Zip Code	59116-0918
City Area Code	406
Local Phone Number	255-5390
Title of 12(b) Security	Class A common stock, no par value
Trading Symbol	FIBK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0000860413
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	42,465,637
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	22,086,944

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 256.6	$ 241.5
Interest bearing deposits in banks	612.5	835.2
Federal funds sold	0.1	0.1
Total cash and cash equivalents	869.2	1,076.8
Investment securities:
Available-for-sale	3,000.3	2,960
Held-to-maturity, net (estimated fair values of $72.6 and $94.5 at March 31, 2020 and December 31, 2019, respectively)	70.2	92.3
Total investment securities	3,070.5	3,052.3
Loans held for investment	8,918	8,930.7
Mortgage loans held for sale	94.4	100.9
Total loans, net of deferred fees and costs	9,012.4	9,031.6
Less allowance for credit losses	129.1	73
Net loans	8,883.3	8,958.6
Goodwill	621.6	621.6
Company-owned life insurance	295.3	293.8
Premises and equipment, net of accumulated depreciation	308.5	306
Core deposit intangibles, net of accumulated amortization	59.2	62.1
Accrued interest receivable	46.3	46.7
Mortgage servicing rights, net of accumulated amortization and impairment reserve	27.8	30.2
Other real estate owned (“OREO”)	8.2	8.5
Other assets	221.5	187.6
Total assets	14,411.4	14,644.2
Deposits:
Non-interest bearing	3,309.3	3,426.5
Interest bearing	8,255.8	8,237
Total deposits	11,565.1	11,663.5
Securities sold under repurchase agreements	614.1	697.6
Accounts payable and accrued expenses	138.5	129.6
Accrued interest payable	10.3	12.1
Deferred tax liability, net	24.4	26.7
Long-term debt	13.9	13.9
Allowance for credit losses on off-balance sheet credit exposures	2.1	0
Subordinated debentures held by subsidiary trusts	86.9	86.9
Total liabilities	12,455.3	12,630.3
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of March 31, 2020 or December 31, 2019	0	0
Common stock	1,018.7	1,049.3
Retained earnings	897.6	953.6
Accumulated other comprehensive gain, net	39.8	11
Total stockholders’ equity	1,956.1	2,013.9
Total liabilities and stockholders’ equity	$ 14,411.4	$ 14,644.2

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Investment securities:
Estimated fair value	$ 72.6	$ 94.5
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

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Interest and fees on loans	$ 112	$ 111.4
Interest and dividends on investment securities:
Taxable	17.2	15.1
Exempt from federal taxes	0.5	0.5
Interest on deposits in banks	2.5	3.6
Total interest income	132.2	130.6
Interest expense:
Interest on deposits	7.3	12.1
Interest on securities sold under repurchase agreements	0.5	1
Interest on other debt	0.3	0.3
Interest on subordinated debentures held by subsidiary trusts	1	1.2
Total interest expense	9.1	14.6
Net interest income	123.1	116
Provision for credit losses	29	3.7
Net interest income after provision for credit losses	94.1	112.3
Non-interest income:
Mortgage banking revenues	13.6	4.1
Investment securities gains (losses), net	0	0
Other income	3.6	4.3
Total non-interest income	43.7	33.2
Non-interest expense:
Salaries and wages	39.9	35.1
Employee benefits	14.2	14.4
Outsourced technology services	7.8	7.9
Occupancy, net	7.3	7
Furniture and equipment	2.8	3.5
OREO expense, net of income	(0.5)	0.1
Professional fees	2.7	3.2
FDIC insurance premiums	1.6	1.5
Mortgage servicing rights amortization	1.5	0.9
Mortgage servicing rights impairment	2.9	0
Core deposit intangibles amortization	2.9	2.3
Other expenses	17.2	14.3
Acquisition related expenses	0	2.3
Total non-interest expense	100.3	92.5
Income before income tax expense	37.5	53
Income tax expense	8.2	11.4
Net income	$ 29.3	$ 41.6
Earnings per common share, basic (in dollars per share)	$ 0.45	$ 0.69
Earnings per common share, diluted (in dollars per share)	$ 0.45	$ 0.69
Weighted average common shares outstanding, basic (in shares)	64,790,186	60,311,171
Weighted average common shares outstanding, diluted (in shares)	64,937,107	60,598,070
Payment services revenues
Non-interest income:
Non-interest income	$ 10.2	$ 9.4
Wealth management revenues
Non-interest income:
Wealth management revenues	6.2	6.1
Service charges on deposit accounts
Non-interest income:
Non-interest income	5.4	5
Other service charges, commissions and fees
Non-interest income:
Non-interest income	$ 4.7	$ 4.3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 29.3	$ 41.6
Other comprehensive income, before tax:
Change in net unrealized gains during period	39.2	33.6
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity	0	(6)
Change in net actuarial loss	(0.2)	(0.2)
Other comprehensive income, before tax	39	27.4
Deferred tax expense related to other comprehensive income	(10.2)	(7.2)
Other comprehensive income, net of tax	28.8	20.2
Comprehensive income, net of tax	$ 58.1	$ 61.8

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common stock	Retained earnings	Accumulated other comprehensive income (loss)
Equity, beginning balance at Dec. 31, 2018	$ 1,693.9	$ 866.7	$ 851.8	$ (24.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41.6		41.6
Other comprehensive income (loss), net of tax expense	20.2			20.2
Common stock transactions:
Common shares purchased and retired	(2.4)	(2.4)
Non-vested common shares forfeited or canceled	0	0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts	0.4	0.4
Stock-based compensation expense	1.9	1.9
Common cash dividend declared	(18.7)		(18.7)
Equity, ending balance at Mar. 31, 2019	1,736.9	866.6	874.7	(4.4)
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	(24.1)		(24.1)
Equity, beginning balance at Dec. 31, 2019	2,013.9	1,049.3	953.6	11
Equity, beginning balance at Dec. 31, 2019	2,013.9	1,049.3	953.6	11
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29.3		29.3
Other comprehensive income (loss), net of tax expense	28.8	0	0	28.8
Common stock transactions:
Common shares purchased and retired	(32.6)	(32.6)	0	0
Non-vested common shares issued	0	0	0	0
Non-vested common shares forfeited or canceled	0	0	0	0
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts	0.6	0.6	0	0
Stock-based compensation expense	1.4	1.4	0	0
Common cash dividend declared	(61.2)	0	61.2	0
Equity, ending balance at Mar. 31, 2020	1,956.1	1,018.7	897.6	39.8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,989.8	$ 1,049.3	$ 929.5	$ 11

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Common shares purchased and retired (in shares)	607	39,360	896	22,596
Common shares issued (in shares)	4,356,498	4,356,498	11,389	11,389
Non-vested common shares issued (in shares)	11,136	211,164		204,991
Non-vested common shares forfeited (in shares)	16,032	21,417	10,566	27,147
stock options exercised (in shares)	41,704	98,686	60,852	127,998
Shares tendered (in shares)	16,104	35,108	4,260	24,729
Common dividends (in dollars per share)	$ 0.28	$ 0.62	$ 0.31	$ 0.56

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 29.3	$ 41.6
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	29	3.7
Net gain on disposal of premises and equipment	0.1	0
Depreciation and amortization	9.7	7.5
Net premium amortization on investment securities	2.4	2
Realized and unrealized net gains on mortgage banking activities	(9.1)	(4.7)
Mortgage servicing rights impairment	2.9	0
Net gain on sale of investments in unrelated entities	(1)	0
Net loss (gain) on sale of OREO	(0.6)	(0.4)
Write-downs of OREO and other assets pending disposal	0	0.3
Deferred taxes	(4.4)	2.7
Net increase in cash surrender value of company-owned life insurance	(1.5)	(0.7)
Stock-based compensation expense	1.4	1.9
Originations of mortgage loans held for sale	(211.3)	(129.8)
Proceeds from sales of mortgage loans held for sale	224.9	132.7
Changes in operating assets and liabilities, net of effects of acquisition:
Decrease (increase) in interest receivable	0.4	(1.6)
Increase in other assets	(34.9)	(3.7)
(Decrease) increase in accrued interest payable	(1.8)	2.2
Increase (decrease) in accounts payable and accrued expenses	6	(6.1)
Net cash provided by operating activities	41.3	47.6
Purchases of investment securities:
Available-for-sale	(419)	(161.3)
Proceeds from maturities and pay-downs of investment securities:
Held-to-maturity	22	11.3
Available-for-sale	415.5	164
Extensions of credit to clients, net of repayments	7.1	(3.2)
Recoveries of loans charged-off	1.5	(1.7)
Proceeds from sale of OREO	1.8	1.8
Proceeds from Sales of Business, Affiliate and Productive Assets	2.2	0
Capital expenditures, net of sales	(4.9)	(2.2)
Net cash provided by investing activities	26.2	(12.1)
Cash flows from financing activities:
Net (decrease) increase in deposits	(98.4)	134
Net decrease in securities sold under repurchase agreements	(83.5)	(39.8)
Proceeds from issuance of common stock	0.6	0.4
Purchase and retirement of common stock	(32.6)	(2.4)
Dividends paid to common stockholders	(61.2)	(18.7)
Net cash (used in) provided by financing activities	(275.1)	73.5
Net increase in cash and cash equivalents	(207.6)	133.2
Cash and cash equivalents at beginning of period	1,076.8	822
Cash and cash equivalents at end of period	869.2	955.2
Supplemental disclosures of cash flow information:
Cash paid during the period for income taxes	11.5	0
Cash paid during the period for interest expense	10.9	12.4
Supplemental disclosures of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	3.2	54.6
Transfer of loans to other real estate owned	0.9	8.4
Capitalization of internally originated mortgage servicing rights	$ 2	$ 1.1

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation In the opinion of management, the accompanying unaudited consolidated financial statements of First Interstate BancSystem, Inc., First Interstate Bank (“FIB”), and its other subsidiaries (together, the “Company”) contain all adjustments (all of which are of a normal recurring nature) necessary to present fairly the financial position of the Company at March 31, 2020 and December 31, 2019 , the results of operations and changes in stockholders’ equity for each of the three month period s ended March 31, 2020 and 2019 , and cash flows for each of the three month periods ended March 31, 2020 and 2019 , in conformity with U.S. generally accepted accounting principles (“GAAP”). The balance sheet information at December 31, 2019 is derived from audited consolidated financial statements. Certain reclassifications, none of which were material, have been made to conform prior year financial statements to the March 31, 2020 presentation. These reclassifications did not change previously reported net income or stockholders’ equity. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 . Operating results for the three months ended March 31, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020 . Current Expected Credit Losses On January 1, 2020, the Company adopted Accounting Standards Codification (“ASC”) 326, Measurement of Credit Losses on Financial Instruments (“ASC 326”), and replaced the historically used incurred loss methodology with an expected loss methodology that is referred to as the Current Expected Credit Loss (CECL) methodology. The measurement of expected credit losses under the CECL methodology is applicable to financial assets measured at amortized cost, including loan held for investment receivables and held-to-maturity debt securities. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with Topic 842 on leases. In addition, ASC 326 made changes to the accounting for available-for-sale debt securities. One such change is to require credit losses to be presented as an allowance rather than as a write-down on available-for-sale debt securities that management does not intend to sell or believes that it is more likely than not they will be required to sell. See “Note 14 - Recent Authoritative Accounting Guidance” included in this report, we adopted ASU 2016-13. The following table summarizes the estimated allowance for credit losses related to financial assets and off-balance sheet credit exposures and the corresponding impacts on the deferred tax liability and retained earnings upon adoption of ASC 326: January 1, 2020 Pre-ASC 326 Adoption Post-ASC 326 Adoption Impact of ASC 326 Adoption Assets: Allowance for credit losses on HTM securities $ — $ — $ — Allowance for credit losses on loans 73.0 103.0 30.0 Liabilities: Off-balance sheet credit exposures — 2.3 2.3 Deferred tax liability 26.7 18.5 (8.2 ) Equity: Retained earnings 953.6 929.5 (24.1 ) Debt Security Investments Investments in debt securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and carried at amortized cost. Investments in debt securities that may be sold in response to or in anticipation of changes in interest rates and resulting prepayment risk, or other factors, are classified as available-for-sale and carried at fair value. The unrealized gains and losses on these securities are reported, net of applicable income taxes, as a separate component of stockholders’ equity and comprehensive income. Management determines the appropriate classification of securities at the time of purchase and at each reporting date management reassesses the appropriateness of the classification. The amortized cost of debt securities classified as held-to-maturity or available-for-sale is adjusted for accretion of discounts to maturity and amortization of premiums over the estimated average life of the security, without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated, or in the case of callable securities, through the first call date, using the effective yield method. Such amortization and accretion is included in interest income. Realized gains and losses on sales are recorded on the trade date in investment securities gains and losses and determined using the specific identification method. Accrued interest receivable on investment securities totaled $9.6 million at March 31, 2020 and was reported in the accrued interest receivable line item on the consolidated balance sheets. Allowance for Credit Losses - Held-to-Maturity Securities: Management measures expected credit losses on held-to-maturity debt securities on a collective basis by major security type. Accrued interest receivable on held-to-maturity debt securities is excluded from the estimate of credit losses. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Management classifies the held-to-maturity portfolio into the following major security types: State, county and municipal securities. Municipal bonds issued by municipal governments within the U.S. These types of securities are primarily composed of general obligation bonds, or municipal bonds backed by the credit and taxing power of the issuing jurisdiction and revenue obligation bonds, or municipal bonds that are financed by income-producing projects and are secured by a specified source of revenue. Municipal issues shall have at least an "A-" rating by Moody's and/or Standard and Poor’s or equivalent creditworthiness must be established prior to purchase. All non-rated or private placement securities must be analyzed and approved by the FIB Credit Department and documented prior to purchase. Obligations of U.S. government agencies and entities. Securities held by the Company are primarily issued by The Federal Home Loan Mortgage Corporation, known as Freddie Mac, and The Federal National Mortgage Association, Fannie Mae, which are implicitly guaranteed by the U.S. government and are consistently highly rated by major rating agencies with very little risk to default. U.S. agency residential mortgage backed securities and Collateralized Mortgage Obligations. Residential mortgage backed securities held by the Company are primarily issued by U.S. government agencies and entities. These securities are either explicitly or implicitly guaranteed by the U.S. government, are consistently highly rated by major rating agencies with very little risk to default. Collateralized mortgage obligations include agency and non-agency residential securities which currently carry ratings no lower than investment grade “BBB-” and pass the federal financial institutions examinations test (Collateral Mortgage Obligation volatility test) at the time of purchase. Corporate securities. Securities held by the Company are primarily comprised of corporate bonds (both senior and subordinated-debt) issued by a firm or public entity which currently carry ratings no lower than investment grade “BBB-” or better by Moody’s, Standard and Poor’s or Kroll rating agencies. All corporate subordinated-debt securities are analyzed and approved by the Company prior to purchase. Allowance for Credit Losses -Available-For-Sale Securities: For available-for-sale debt securities in an unrealized loss position, the Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell the security before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security's amortized cost basis is written down to fair value through income. For available-for-sale debt securities that do not meet the aforementioned criteria, the Company performs a qualitative assessment as to whether the decline in fair value has resulted from credit losses or other factors. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income. Changes in the allowance for credit losses are recorded as provision for (or reversal of) credit loss expense. Losses are charged against the allowance when management believes the uncollectibility of an available-for-sale security is confirmed or when either of the criteria regarding intent or requirement to sell is met. Accrued interest receivable on available-for-sale debt securities is excluded from the estimate of credit losses. Loans held for investment Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at amortized cost or principal balance outstanding. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts and deferred loan fees and costs. Loan origination fees, net of certain direct origination costs, are deferred and recognized in interest income using the level-yield method without anticipating prepayments. Accrued interest receivable on loans held for investment totaled $36.4 million at March 31, 2020 and was reported in the accrued interest receivable line item on the consolidated balance sheets. Interest income is accrued on the unpaid principal balance of underlying loans. Interest income on mortgage and commercial loans is discontinued and placed on nonaccrual status at the time the loan is 90 days delinquent unless the loan is well secured and in process of collection. Mortgage loans are charged off at 180 days past due, and commercial loans are charged off to the extent principal or interest is deemed uncollectible. Consumer and credit card loans continue to accrue interest until they are charged off no later than 120 days past due unless the loan is in the process of collection. Past-due status is based on the contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful. All interest accrued but not received for loans placed on nonaccrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash-basis method, interest income is recorded when the payment is received in cash. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and when, in the opinion of management, the loans are estimated to be fully collectible as to both principal and interest. Purchased Credit Deteriorated (“PCD”) Loans The Company has purchased loans, some of which have experienced more than insignificant credit deterioration since origination. Loans that meet at least one of the following criteria are considered to have experienced more-than-insignificant credit deterioration since origination at the date of acquisition: 1) delinquent as of the acquisition date; 2) has been downgraded since origination; 3) has been placed on nonaccrual status at any point since origination; or 4) for which credit spreads have widened beyond market-level thresholds. PCD loans are recorded at the amount paid for the loan. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on a collective basis is allocated to individual loans. The sum of the loan's purchase price and allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. Subsequent changes to the allowance for credit losses are recorded through provision expense. Allowance for Credit Losses - Loans 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 on the loans. Loans are charged off against the allowance when management believes the uncollectibility of a loan balance is confirmed. When forecasting expected recoveries the amounts should not exceed the aggregate of amounts that have previously been or are expected to be charged-off loans. The Company has elected to not 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, delinquency level, 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 (pool) basis when similar risk characteristics exist. The Company applies Probability of Default (PD), and Loss Given Default (LGD), methodologies for all portfolio segments. The Company uses a Transition Matrix (TM) for PD components of the methodology and a historical average for the LGD components of methodology. The PD and LGD is applied to the current principal balance as of the reporting date. The TM determines the PD by tracking the historical movement of loans between loan risk tiers over a defined period of time. The Company currently has 16 portfolio segments for which we track monthly movement between either risk ratings or delinquency bands. While the TM functions similarly across all portfolio segments, generally speaking, commercial portfolios use the Company’s risk rating scale and consumer portfolios use the delinquency day count, or delinquency band. Loans using risk ratings are scored utilizing the Company’s risk rating scale. The risk rating scale is 1-10, with 1 being the best rating, 6 being a pass but on watch, and 7-10 being various stages of criticized loans. Risk ratings 8 or greater and in a non-accrual status are considered in a defaulted state. Loans using delinquency band are measured using a 5-grade band, with 1 being current and 5 being 90 or more days past due. The LGD used as the basis for the estimate of credit losses is comprised of the Company's historical loss experience from 2008 to the current period. The model compares the most recent period losses to prior period defaults to calculate the LGD, which is averaged over the historical observations. Economic scenarios and forecasts along with current portfolio conditions and trends are monitored and accounted for through the Company’s qualitative framework. The Company utilizes a one-year forecast period. The Company segments the loan portfolio into pools based on the following risk characteristics: financial asset type, collateral type, loan characteristics, credit characteristics, outstanding loan balances, contractual terms and prepayment assumptions, vintage, industry of borrower and concentrations, and historical or expected credit loss. The Company has identified the following portfolio segments and measures the allowance for credit losses using the following methods: Portfolio segments using the Company’s risk ratings include the following: Commercial real estate non-owner-occupied loans. These loans include a mix of variable and fixed rate non-farm, non-residential real estate loans secured by non-owner-occupied properties. Commercial real estate non-owner-occupied loans are generally secured by first liens on income-producing real estate and generally mature in less than 10 years. Commercial real estate owner-occupied loans. Non-farm, non-residential real estate loans are generally secured by first liens on real estate where the owner occupant is the majority tenant of the property and generally mature in less than 10 years. Construction land acquisition and development loans. Construction land acquisition and development loans are primarily to commercial builders for residential lot development and the construction of single-family residences and commercial real estate properties. Construction loans are generally underwritten pursuant to pre-approved permanent financing. During the construction phase the borrower pays interest only. Construction land acquisition and development loans generally mature in three years or less. Residential construction loans. Construction residential loans are primarily to commercial builders or owner occupants for the construction of single-family residences. 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 mature in one to two years. Commercial construction loans. Commercial construction loans are primarily to commercial builders for commercial real estate properties. Construction loans are generally underwritten pursuant to credit worthiness or pre-qualification for permanent financing. During the construction phase the borrower pays interest only. Commercial construction loans generally mature in two years or less. Agricultural real estate loans. These include loans 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. Agricultural real estate loans generally mature in ten years or less. Commercial and floor plan loans. The Company provides a mix of variable and fixed rate commercial loans in addition to loans to finance dealership floor inventories. The loans are typically made to small and medium-sized manufacturing, wholesale, retail and service businesses for working capital needs and business expansions. Commercial loans generally include lines of credit, business credit cards and loans with maturities of five years or less and outstanding balances tend to be cyclical in nature. The 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. Commercial and floor plan loans generally mature in seven years or less. Commercial purpose secured by 1-4 family loans. These include loans for commercial purposes secured by 1-4 family residential property. Commercial purpose loans secured by 1-4 family generally mature in seven years or less. 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. Portfolio segments utilizing the delinquency bands include the following: Consumer indirect loans. These include 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. These 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. Consumer direct and advance line loans generally mature in seven years or less. Consumer credit card loans. These 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. Consumer home equity and home equity lines of credit (“HELOC”). These include home equity loans and lines of credit that are secured by residential property. Consumer home equity generally mature in 15 years or less and HELOC loans generally mature in 25 years or less. Residential 1-4 family and multi-family lending. These are loans to finance the purchase or refinance of residential property which are typically secured by first liens, inclusive of 1-4 Family as well as 5+ residential properties. Residential 1-4 family generally mature within 15 years but can be up to 30 years. Multifamily loans generally mature in ten years or less. Commercial real estate multi-family loans. Commercial real estate multi-family loans are generally secured by first liens on income-producing rental real estate consisting of 5 or more residential dwelling units and generally mature in less than 10 years. For CECL related segmentation, multi-family loans are modeled with residential 1-4 family but are reported under Commercial Real Estate. Commercial credit card loans. These are lines of credit for commercial purposes that are generally floating rate loans and include both unsecured and secured lines. For CECL related segmentation, commercial credit card loans are modeled separately but are reported under Commercial. Commercial credit card loans generally do not have stated maturities but are reviewed periodically and are unconditionally cancellable. Agricultural credit card loans. Lines of credit for agricultural purposes that are generally floating rate loans and are unsecured or secured. For CECL related segmentation, agricultural credit card loans are modeled separately but are reported under Commercial. Agricultural credit card loans generally do not have stated maturities but are reviewed periodically and are unconditionally cancellable. Contractual term Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower 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 troubled debt restructurings (“TDR”). The allowance for credit loss on a TDR is measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. When the value of a concession is measured using the discounted cash flow method, the allowance for credit loss is determined by discounting the expected future cash flows at the original interest rate of the loan. 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. Our unused credit card lines and federal fund lines, extended to others, are considered by management to be unconditionally cancellable. Credit cards receivables are run through the transition matrices and their unused lines are excluded from the final loss calculation because they are 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	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Acquisitions	Acquisitions Community 1 st Bank. On October 11, 2018 , the Company entered into a definitive agreement to acquire all of the outstanding stock of Community 1st Bank (“CMYF”), a community bank headquartered in Post Falls, Idaho with three banking offices in North Idaho. The acquisition was completed on April 8, 2019 , and conversion of the data processing systems occurred on June 7, 2019 . Consideration for the acquisition was $18.8 million , consisting of the issuance of 463,134 shares of the Company's Class A common stock valued at $40.64 per share, the closing price of the Company's Class A common stock as quoted on the NASDAQ stock market on the acquisition date. Holders of each share of CMYF common stock received 0.3784 shares of First Interstate Class A common stock for each share of CMYF common stock. Previously unvested CMYF restricted stock awards outstanding immediately prior to the close of the transaction vested and were considered issued and outstanding at acquisition close and included in consideration. All CMYF stock options outstanding, vested and were settled by CMYF prior to the close of the transaction. The assets and liabilities of CMYF were recorded in the Company’s consolidated financial statements at their estimated fair values as of the acquisition date. The excess value of the consideration paid over the fair value of assets acquired and liabilities assumed is recorded as goodwill. The purchase price allocation resulted in goodwill of $2.3 million , which is not deductible for income tax purposes. Goodwill resulting from the acquisition was allocated to the Company’s one operating segment, community banking, and consists largely of the synergies and economies of scale expected from combining the operations of CMYF and the Company. The Company recorded net assets acquired of approximately $16.5 million consisting of approximately $129.1 million in assets, inclusive of $78.8 million of loans, of which $0.7 million were classified as credit impaired, and assumed approximately $112.6 million of liabilities, inclusive of $110.1 million of deposits. All amounts reported were finalized during the fourth quarter of 2019. Core deposit intangible assets of $3.0 million are being amortized using an accelerated method over the estimated useful lives of the related deposits of 10 years. Unaudited pro forma consolidated revenues and net income as if the CMYF acquisition had occurred as of January 1, 2019, are not presented because the effect of this acquisition was not considered significant. The accompanying consolidated statements of income for the three months ended March 31, 2020 , include the results of operations of the acquired entity from the April 8, 2019 acquisition date. Although legally merged with FIB, the acquired entity continued to do business as CMYF until June 7, 2019 , at which point CMYF’s operations were integrated with the Company’s operations. Idaho Independent Bank. On October 11, 2018 , the Company also entered into a definitive agreement to acquire all of the outstanding stock of Idaho Independent Bank (“IIBK”), a community bank headquartered in Coeur d' Alene, Idaho with 11 banking offices across Idaho. The acquisition was completed on April 8, 2019 , and the Company converted data processing systems on June 7, 2019 . Consideration for the acquisition was $157.3 million , consisting of the issuance of 3,871,422 shares of the Company's Class A common stock valued at $40.64 per share, the closing price of the Company's Class A common stock as quoted on the NASDAQ stock market on the acquisition date. Holders of each share of IIBK common stock received 0.50 shares of First Interstate Class A common stock for each share of IIBK common stock. Previously unvested IIBK restricted stock awards outstanding immediately prior to the close of the transaction vested and were considered issued and outstanding at acquisition close and included in consideration. All IIBK stock options outstanding, vested and were settled by IIBK prior to the close of the transaction. The assets and liabilities of IIBK were recorded in the Company’s consolidated financial statements at their estimated fair values as of the acquisition date. The excess value of the consideration paid over the fair value of assets acquired and liabilities assumed is recorded as goodwill. The purchase price allocation resulted in goodwill of $73.0 million , which is not deductible for income tax purposes. Goodwill resulting from the acquisition was allocated to the Company’s one operating segment, community banking, and consists largely of the synergies and economies of scale expected from combining the operations of IIBK and the Company. The following table summarizes the consideration paid, fair values of the IIBK assets acquired and liabilities assumed, and the resulting goodwill. All amounts reported were finalized during the fourth quarter of 2019. As Recorded Fair Value As Recorded As of April 8, 2019 by IIBK Adjustments by the Company Assets acquired: Cash and cash equivalents $ 270.7 $ — $ 270.7 Investment securities 62.7 0.5 (1) 63.2 Loans held for investment 347.6 (9.8 ) (2) 337.8 Mortgage loans held for sale 0.5 — 0.5 Allowance for loan loss (6.3 ) 6.3 (3) — Premises and equipment 16.5 4.8 (4) 21.3 Other real estate owned (“OREO”) 0.4 2.0 (5) 2.4 Company owned life insurance 15.2 — 15.2 Core deposit intangible assets — 13.6 (6) 13.6 Deferred tax assets, net 3.2 (2.6 ) (7) 0.6 Other assets 8.6 (0.7 ) (8) 7.9 Total assets acquired 719.1 14.1 733.2 Liabilities assumed: Deposits 596.5 0.1 (9) 596.6 Accounts payable and accrued expense 15.2 2.6 (10) 17.8 Other borrowed funds 4.0 0.1 (11) 4.1 Securities sold under repurchase agreements 30.4 — 30.4 Total liabilities assumed 646.1 2.8 648.9 Net assets acquired $ 73.0 $ 11.3 $ 84.3 Consideration paid: Class A common stock $ 157.3 Total consideration paid $ 157.3 Goodwill $ 73.0 Explanation of fair value adjustments and the removal of previously recorded fair value marks recorded by IIBK: (1) Write up of the book value of investments to their estimated fair values on the date of acquisition based upon quotes obtained from an independent third party pricing service. (2) Write down of the book value of loans to their estimated fair values. The fair value of the loans was estimated using cash flow projections based on the remaining maturity and repricing terms, adjusted for estimated future credit losses and prepayments and discounted to present value using a risk-adjusted market rate for similar loans. The fair value of collateral dependent loans acquired with deteriorated credit quality was estimated based on the Company’s analysis of the fair value of each loan’s underlying collateral, discounted using market-derived rates of return with consideration given to the period of time and costs associated with foreclosure and disposition of the collateral. (3) Adjustment to remove the IIBK allowance for loan losses at acquisition date, as the credit risk is included in the fair value adjustment for loans receivable described in (2) above. (4) Write up of the book value of premises and equipment to their estimated fair values on the date of acquisition based upon broker’s opinion of value. (5) Adjustment to the book value of other real estate owned to their estimated fair values on the date of acquisition based on appraisal value. (6) Adjustment represents the value of the core deposit base assumed in the acquisition based upon valuation from an independent accounting and advisory firm. (7) Adjustment consists of the write-off of pre-existing deferred tax assets and purchase accounting adjustments as a result of the acquisition. (8) Adjustment consists of reductions to the fair value of other items. (9) Increase in book value of time deposits to their estimated fair values based upon interest rates of similar time deposits with similar terms on the date of acquisition based upon valuation from an independent accounting and advisory firm. (10) Adjustment to the liability for the nonqualified retirement plan. (11) Adjustment of the book value of debt to the estimated fair values on the date of acquisition based upon interest rates in the market. Core deposit intangible assets of $13.6 million are being amortized using an accelerated method over the estimated useful lives of the related deposits of 10 years. Effective January 1, 2020, the Company began accounting for PCD loans pursuant to ASC Topic 326. As such, the following disclosures are no longer applicable for the current period and are only presented for periods prior to the adoption of ASC Topic 326. Prior to the adoption of ASC 326, the Company acquired certain loans that were subject to Accounting Standards Codification ("ASC") Topic 310-30 "Loans and Debt Securities Acquired with Deteriorated Credit Quality." ASC Topic 310-30 provides recognition, measurement and disclosure guidance for acquired loans that have evidence of deterioration in credit quality since origination for which it is probable, at acquisition, the Company will be unable to collect all contractual amounts owed. For loans that meet the criteria stipulated in ASC Topic 310-30, the excess of all cash flows expected at acquisition over the initial fair value of the loans acquired ("accretable yield") is amortized to interest income over the expected remaining lives of the underlying loans using the effective interest method. The accretable yield will fluctuate due to changes in (i) estimated lives of underling credit-impaired loans, (ii) assumptions regarding future principal and interest amounts collected, and (iii) indices used to fair value variable rate loans. Information regarding IIBK loans acquired deemed credit impaired as of the April 8, 2019 acquisition date are as follows: Contractually required principal and interest payments $ 24.1 Contractual cash flows not expected to be collected (“non-accretable discount”) 3.9 Cash flows expected to be collected 20.2 Interest component of cash flows expected to be collected (“accretable discount”) 3.4 Fair value of acquired credit-impaired loans $ 16.8 Information regarding IIBK acquired loans not deemed credit-impaired at the April 8, 2019 acquisition date are as follows: Contractually required principal and interest payments $ 398.7 Contractual cash flows not expected to be collected 15.2 Fair value at acquisition $ 321.5 Unaudited pro forma consolidated revenues and net income as if the IIBK acquisition had occurred as of January 1, 2019, are not presented because the effect of this acquisition was not considered significant. The accompanying consolidated statements of income for the three months ended March 31, 2020 , include the results of operations of the acquired entity from the April 8, 2019 acquisition date. Although legally merged with FIB, the acquired entity continued to do business as IIBK until June 7, 2019 , at which point IIBK’s operations were integrated with the Company’s operations. The Company recorded no pre-tax acquisition related expenses for the three months ended March 31, 2020 and $2.3 million in pre-tax acquisition related expenses for the three months ended March 31, 2019 . These costs are incorporated in non-interest expenses in the Company’s consolidated statements of income.

Goodwill and Core Deposit Intan

Goodwill and Core Deposit Intangibles	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Core Deposit Intangibles	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;text-decoration:underline;">Goodwill and Core Deposit Intangibles</font></div><div style="line-height:120%;padding-left:36px;text-indent:-36px;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-bottom:10px;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances, such as upon material adverse changes in legal, business, regulatory, and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 1, 2019 and 2018 and concluded that there was </font><font style="font-family:inherit;font-size:10pt;">no</font><font style="font-family:inherit;font-size:10pt;"> impairment to goodwill.</font></div><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table presents a rollforward of goodwill from the beginning of the year to goodwill as of the dates indicated:</font></div><div style="line-height:120%;text-align:left;padding-left:36px;text-indent:0px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:94.54545454545455%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:74%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">March 31, <br clear="none"/>2020</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">December 31, <br clear="none"/>2019</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net carrying value at beginning of the period</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">621.6</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">546.7</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Additions to provisional goodwill from acquisitions</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">—</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">74.9</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net carrying value at end of period</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">621.6</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">621.6</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;padding-left:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table presents Core deposit intangibles (“CDI”) as of the dates indicated:</font></div><div style="line-height:120%;text-align:left;padding-left:36px;text-indent:0px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:94.54545454545455%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:74%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">March 31, <br clear="none"/>2020</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">December 31, <br clear="none"/>2019</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Gross CDI, at beginning of the period</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">106.0</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">89.7</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Established through acquisitions or provisional adjustments</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">—</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">16.6</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Reductions due to sale of accounts</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(0.3</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Accumulated amortization</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(46.9</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(43.9</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net CDI, end of period</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">59.1</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">62.1</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;padding-left:30px;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"><br clear="none"/></font></div><div style="line-height:120%;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company recorded </font><font style="font-family:inherit;font-size:10pt;">$2.9 million</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">$2.3 million</font><font style="font-family:inherit;font-size:10pt;"> of CDI amortization expense for </font><font style="font-family:inherit;font-size:10pt;">the three months ended March 31, 2020</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2019</font><font style="font-family:inherit;font-size:10pt;">, respectively, and </font><font style="font-family:inherit;font-size:10pt;">$2.9 million</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">$2.3 million</font><font style="font-family:inherit;font-size:10pt;"> for </font><font style="font-family:inherit;font-size:10pt;">the three month ended March 31, 2020</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">2019</font><font style="font-family:inherit;font-size:10pt;">, respectively.</font></div><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">CDI are evaluated for impairment if events and circumstances indicate a possible impairment and are amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is generally </font><font style="font-family:inherit;font-size:10pt;">ten years</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:left;padding-left:36px;text-indent:0px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table provides the estimated future CDI amortization expense: </font><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:94.54545454545455%;border-collapse:collapse;text-align:left;"><tr><td colspan="6" rowspan="1"></td></tr><tr><td style="width:55%;" rowspan="1" colspan="1"></td><td style="width:18%;" rowspan="1" colspan="1"></td><td style="width:18%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:7%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Years Ending December 31,</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2019 remaining</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inher

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The amortized cost and the approximate fair values of investment securities are summarized for the periods indicated: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 17.1 $ — $ — $ 17.1 State, county and municipal securities 111.4 0.9 — 112.3 Obligations of U.S. government agencies 202.7 1.0 (0.1 ) 203.6 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 2,356.7 60.8 (2.7 ) 2,414.8 Private mortgage-backed securities 41.2 — (1.2 ) 40.0 Corporate securities 215.6 0.4 (5.5 ) 210.5 Other investments 2.0 — — 2.0 Total $ 2,946.7 $ 63.1 $ (9.5 ) $ 3,000.3 March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 55.2 $ 2.3 $ — $ 57.5 Obligations of U.S. government agencies 9.8 — — 9.8 U.S agency residential mortgage-backed securities & collateralized mortgage obligations 1.2 0.1 — 1.3 Corporate securities 3.9 — — 3.9 Other investments 0.1 — — 0.1 Total $ 70.2 $ 2.4 $ — $ 72.6 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 9.0 $ — $ — $ 9.0 State, county and municipal securities 80.1 0.8 — 80.9 Obligations of U.S. government agencies 367.5 0.1 (0.8 ) 366.8 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 2,303.6 19.6 (6.0 ) 2,317.2 Private mortgage-backed securities 47.6 — (0.4 ) 47.2 Corporate securities 134.5 1.2 — 135.7 Other investments 3.2 — — 3.2 Total $ 2,945.5 $ 21.7 $ (7.2 ) $ 2,960.0 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 57.3 $ 2.1 $ — $ 59.4 Obligations of U.S. government agencies 19.8 — — 19.8 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 1.2 — — 1.2 Corporate securities 13.9 0.1 — 14.0 Other investments 0.1 — — 0.1 Total $ 92.3 $ 2.2 $ — $ 94.5 There were no material gross realized gains or losses from the disposition of available-for-sale investment securities for the three month period ended March 31, 2020 and 2019 . The following tables show the gross unrealized losses and fair values of available-for-sale investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position as of March 31, 2020 and December 31, 2019 . There was no material allowance for credit loss as of March 31, 2020 . Less than 12 Months 12 Months or More Total March 31, 2020 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: Obligations of U.S. government agencies $ 19.9 $ (0.1 ) $ — $ — $ 19.9 $ (0.1 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 143.5 (1.7 ) 133.6 (1.0 ) 277.1 (2.7 ) Private mortgage-backed securities — — 40.0 (1.2 ) 40.0 (1.2 ) Corporate securities 119.9 (4.9 ) 39.9 (0.6 ) 159.8 (5.5 ) Total $ 283.3 $ (6.7 ) $ 213.5 $ (2.8 ) $ 496.8 $ (9.5 ) Less than 12 Months 12 Months or More Total December 31, 2019 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: Obligations of U.S. government agencies $ 185.3 $ (0.8 ) $ — $ — $ 185.3 $ (0.8 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 740.1 (4.6 ) 155.9 (1.4 ) 896.0 (6.0 ) Private mortgage-backed securities — — 46.6 (0.4 ) 46.6 (0.4 ) Total $ 925.4 $ (5.4 ) $ 202.5 $ (1.8 ) $ 1,127.9 $ (7.2 ) The available-for-sale securities portfolio contains securities that are guaranteed by a sovereign entity or are generally considered to have non-credit related risks, such as interest rate risk or prepayment and liquidity factors. The Company considers whether the securities are issued by the federal government or its agencies and whether downgrades by bond rating agencies have occurred. The unrealized losses are due to changes in interest rates and other market conditions. The Company had 239 and 331 individual available-for-sale investment securities that were in an unrealized loss position as of March 31, 2020 and December 31, 2019 , respectively, related primarily to fluctuations in the current interest rates. As of March 31, 2020 , the Company had the intent and ability to hold these investment securities for a period of time sufficient to allow for an anticipated recovery. Furthermore, the Company does not have the intent to sell any of the available-for-sale securities in the above table and it is more likely than not that the Company will not have to sell any securities before a recovery in cost. There was no t a material allowance for credit losses during the three month period s ended March 31, 2020 or 2019 for available-for-sale or held-to-maturity securities. Maturities of investment securities at March 31, 2020 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates. Available-for-Sale Held-to-Maturity March 31, 2020 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Within one year $ 614.3 $ 608.0 $ 19.7 $ 19.8 After one year but within five years 1,416.2 1,422.1 27.4 27.8 After five years but within ten years 421.2 523.5 21.3 23.2 After ten years 495.0 446.7 1.8 1.8 Total $ 2,946.7 $ 3,000.3 $ 70.2 $ 72.6 As of March 31, 2020 , the Company had investment securities callable within one year with amortized costs and estimated fair values of $128.7 million and $129.2 million , respectively. These investment securities are primarily included in the “after one year but within five years” category in the table above. As of March 31, 2020 , the Company had no callable structured notes.

Loans

Loans	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Loans	Loans The following table presents loans by segment as of the dates indicated: March 31, December 31, Real estate loans: Commercial* $ 3,543.4 $ 3,487.8 Construction loans: Land acquisition & development 290.5 302.1 Residential 228.4 244.1 Commercial 459.4 431.5 Total construction loans 978.3 977.7 Residential* 1,231.0 1,246.1 Agricultural 224.6 226.6 Total real estate loans 5,977.3 5,938.2 Consumer loans: Indirect 774.6 784.6 Direct and advance lines 175.0 179.0 Credit card 75.9 81.6 Total consumer loans 1,025.5 1,045.2 Commercial* 1,660.0 1,673.7 Agricultural 257.9 279.1 Other, including overdrafts 3.7 — Net deferred loan fees and costs (6.4 ) (5.5 ) Loans held for investment 8,918.0 8,930.7 Mortgage loans held for sale 94.4 100.9 Total loans 9,012.4 9,031.6 Allowance for credit losses (129.1 ) (73.0 ) Total loans, net $ 8,883.3 $ 8,958.6 *In conjunction with the adoption of ASC 326, the Company reclassified certain 2019 amounts in our multi-family loan portfolio from residential real estate to commercial real estate. Additionally, we reclassified certain 2019 amounts in our commercial 1-4 family and commercial home equity lines of credit from commercial real estate to commercial to conform 2019 amounts to the March 31, 2020 presentation. These reclassifications did not change previously reported total loans. Allowance for credit losses The following table represents, by loan portfolio segment, the activity in the allowance for credit losses for loans held for investment: Three Months Ended March 31, 2020 Beginning Balance, Prior to Adoption of ASC 326 Impact of Adopting ASC 326 Provision for Credit Loss Expense Loans Charged-Off Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate: Commercial real estate: Non-owner occupied $ 8.8 $ 4.9 $ 2.0 $ — $ — $ 15.7 Owner occupied 10.0 3.5 2.2 — — 15.7 Multi-family 0.7 6.9 0.5 — — 8.1 Total commercial real estate 19.5 15.3 4.7 — — 39.5 Construction: Land acquisition & development 1.9 (0.1 ) 0.1 (0.5 ) — 1.4 Residential construction 1.5 (0.9 ) 0.5 — — 1.1 Commercial construction 2.7 1.3 2.1 — — 6.1 Total construction 6.1 0.3 2.7 (0.5 ) — 8.6 Residential real estate: Residential 1-4 family 1.8 10.6 0.5 — — 12.9 Home equity and HELOC 1.0 0.5 (0.1 ) — — 1.4 Total residential real estate 2.8 11.1 0.4 — — 14.3 Agricultural real estate 0.5 1.8 0.3 — — 2.6 Total real estate 28.9 28.5 8.1 (0.5 ) — 65.0 Consumer: Indirect 4.5 8.8 3.9 (1.2 ) 0.7 16.7 Direct and advance lines 2.9 3.0 0.4 (1.0 ) 0.2 5.5 Credit card 2.5 0.3 0.4 (0.8 ) 0.2 2.6 Total consumer 9.9 12.1 4.7 (3.0 ) 1.1 24.8 Commercial: Commercial and floor plans 25.5 (5.1 ) 13.5 (0.8 ) 0.4 33.5 Commercial purpose secured by 1-4 family 5.9 (3.8 ) 2.4 (0.1 ) — 4.4 Credit card 1.2 (1.1 ) 0.4 (0.2 ) — 0.3 Total commercial 32.6 (10.0 ) 16.3 (1.1 ) 0.4 38.2 Agricultural: Agricultural 1.6 (0.6 ) 0.1 — — 1.1 Total agricultural 1.6 (0.6 ) 0.1 — — 1.1 Total allowance for credit losses $ 73.0 $ 30.0 $ 29.2 $ (4.6 ) $ 1.5 $ 129.1 (1) Amounts presented above are exclusive of the allowance for credit losses related to unfunded commitments which are included in “Note 11 - Financial Instruments with Off-Balance Sheet Risk” included in this report. The following table represents activity in the allowance for credit losses for loans held for investment under historical GAAP: Three Months Ended March 31, 2019 Beginning Balance Provision for Credit Loss Expense Loans Charged-Off Recoveries Collected Ending Balance Allowance for credit losses Real estate $ 31.0 $ (1.7 ) $ (2.1 ) $ 0.2 $ 27.4 Consumer 8.7 2.0 (3.0 ) 1.1 8.8 Commercial 31.3 3.6 (0.8 ) 0.4 34.5 Agricultural 2.0 (0.2 ) (0.1 ) — 1.7 Total allowance for credit losses $ 73.0 $ 3.7 $ (6.0 ) $ 1.7 $ 72.4 Collateral dependent financial loans A collateral dependent financial loan relies solely on the operation or sale of the collateral for repayment. In evaluating the overall risk associated with a loan, the Company considers character, overall financial condition and resources, and payment record of the borrower; the prospects for support from any financially responsible guarantors; and the nature and degree of protection provided by the cash flow and value of any underlying collateral. When the borrower is experiencing financial difficulty and as sources of repayment become inadequate over time and that repayment is expected to be provided substantially through the operation or sale of the collateral, the loan may become collateral dependent. The following tables present the amortized cost basis of collateral dependent loans by class of loans as of March 31, 2020. The comparable period is not presented as collateral dependent type loans did not exist under prior GAAP. Under historical guidance, the recorded investment of impaired loans and the related specific reserve was $64.7 million and $3.6 million , respectively, as of December 31, 2019 . Collateral Type As of March 31, 2020 Business Assets Real Property Other Total Real estate $ 0.3 $ 1.0 $ 0.1 $ 1.4 Commercial 3.5 0.5 0.4 4.4 Agricultural — 0.1 — 0.1 Total collateral-dependent $ 3.8 $ 1.6 $ 0.5 $ 5.9 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 included in the following table as greater than 90 days past due are still accruing interest. The following tables present the contractual aging of the Company’s recorded amortized cost basis in loans by portfolio as of the dates indicated. Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of March 31, 2020 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate Commercial $ 7.1 $ 1.2 $ 1.0 $ 9.3 $ 3,519.9 $ 14.2 $ 3,543.4 Construction: Land acquisition & development 2.2 0.3 0.4 2.9 286.9 0.7 290.5 Residential 3.0 — 0.7 3.7 224.3 0.4 228.4 Commercial 0.1 — — 0.1 458.8 0.5 459.4 Total construction loans 5.3 0.3 1.1 6.7 970.0 1.6 978.3 Residential 2.3 0.8 0.2 3.3 1,222.9 4.8 1,231.0 Agricultural 0.8 — 2.9 3.7 213.3 7.6 224.6 Total real estate loans 15.5 2.3 5.2 23.0 5,926.1 28.2 5,977.3 Consumer: Indirect consumer 7.3 2.2 0.5 10.0 762.6 2.0 774.6 Other consumer 1.3 0.5 0.1 1.9 172.5 0.6 175.0 Credit card 0.8 0.3 0.9 2.0 73.9 — 75.9 Total consumer loans 9.4 3.0 1.5 13.9 1,009.0 2.6 1,025.5 Commercial 12.6 6.6 4.3 23.5 1,619.5 17.0 1,660.0 Agricultural 2.9 0.8 1.0 4.7 249.9 3.3 257.9 Other, including overdrafts — — — — 3.7 — 3.7 Loans held for investment $ 40.4 $ 12.7 $ 12.0 $ 65.1 $ 8,808.2 $ 51.1 $ 8,924.4 Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of December 31, 2019 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate Commercial $ 5.5 $ 1.1 $ 0.6 $ 7.2 $ 3,467.6 $ 13.0 $ 3,487.8 Construction: Land acquisition & development 0.7 0.8 0.3 1.8 298.9 1.4 302.1 Residential 1.5 0.8 — 2.3 241.8 — 244.1 Commercial — — — — 431.0 0.5 431.5 Total construction loans 2.2 1.6 0.3 4.1 971.7 1.9 977.7 Residential 3.8 1.4 1.1 6.3 1,235.2 4.6 1,246.1 Agricultural 0.8 0.5 — 1.3 220.1 5.2 226.6 Total real estate loans 12.3 4.6 2.0 18.9 5,894.6 24.7 5,938.2 Consumer: Indirect consumer 7.6 1.9 0.5 10.0 773.0 1.6 784.6 Other consumer 1.2 0.5 0.1 1.8 176.7 0.5 179.0 Credit card 0.8 0.5 0.8 2.1 79.5 — 81.6 Total consumer loans 9.6 2.9 1.4 13.9 1,029.2 2.1 1,045.2 Commercial 4.8 2.6 2.3 9.7 1,650.3 13.7 1,673.7 Agricultural 0.9 0.1 — 1.0 275.7 2.4 279.1 Other, including overdrafts — — — — — — — Loans held for investment $ 27.6 $ 10.2 $ 5.7 $ 43.5 $ 8,849.8 $ 42.9 $ 8,936.2 (1) As of March 31, 2020 and December 31, 2019 , none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three months ended March 31, 2020 and 2019 , respectively. Accrued interest of $0.2 million and $0.6 million was reversed during the three months ended March 31, 2020 and 2019 , respectively. Troubled debt restructurings Modifications of performing loans are made in the ordinary course of business and are completed on a case-by-case basis as negotiated with the borrower in connection with the ongoing loan collection processes. Loan modifications typically include interest rate changes, interest only periods of less than twelve months, short-term payment deferrals and extension of amortization periods to provide payment relief. A loan modification is considered a troubled debt restructuring if the borrower is experiencing financial difficulties and the Company, for economic or legal reasons, grants a concession to the borrower that it would not otherwise consider. Certain troubled debt restructurings are on non-accrual status at the time of restructuring and may be returned to accrual status after considering the borrower’s sustained repayment performance in accordance with the restructuring agreement for a period of at least six months and management is reasonably assured of future performance. If the troubled debt restructuring meets these performance criteria and the interest rate granted at the modification is equal to or greater than the rate that the Company was willing to accept at the time of the restructuring for a new loan with comparable risk, then the loan will return to performing status and the accrual of interest will resume, although they continue to be individually evaluated for credit deterioration and disclosed as collateral dependent loans. The Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”) was signed into law on March 27, 2020 in response to the recent outbreak of a new strain of coronavirus (also known as, and hereinafter referred to as “COVID-19”). Key provisions of the CARES Act include one-time payments to individuals, strengthened unemployment insurance, additional health-care funding, temporary amendments to the Internal Revenue Code and loans and grants to certain businesses. The CARES Act provides all banks with the option to elect either or both of the following from March 1, 2020 until the earlier of December 31, 2020 or the date that is 60 days after the termination of the national emergency: (1) to suspend the requirements under GAAP for loan modifications related to the COVID–19 pandemic that would otherwise be categorized as a TDR; and/or (2) to suspend any determination of a loan modified as a result of the effects of the COVID–19 pandemic as being a TDR, including impairment for accounting purposes. If a bank elects a suspension noted above, the suspension (1) will be effective for the term of the loan modification, but solely with respect to any modification, including a forbearance arrangement, an interest rate modification, a repayment plan, and any other similar arrangement that defers or delays the payment of principal or interest, that occurs during the applicable period for a loan that was not more than 30 days past due as of December 31, 2019; and (2) will not apply to any adverse impact on the credit of a borrower that is not related to the COVID–19 pandemic. The Company has elected to apply these provisions at the individual loan level. The Company had loans renegotiated in troubled debt restructurings of $22.4 million as of March 31, 2020 , of which $17.4 million were included in non-accrual loans and $5.0 million were on accrual status. The Company allocated $1.9 million of allowance for credit losses to those loans. The Company had no material commitments to lend additional funds to borrowers whose existing loans have been renegotiated or are classified as non-accrual. The Company had loans renegotiated in troubled debt restructurings of $24.9 million as of December 31, 2019 , of which $19.4 million were included in non-accrual loans and $5.5 million were on accrual status. The Company allocated $0.3 million of allowance for credit losses to those loans. The Company had no material commitments to lend additional funds to borrowers whose existing loans have been renegotiated or are classified as non-accrual. The Company had no material new troubled debt restructurings during the three months ended March 31, 2020 . For troubled debt restructurings that were on non-accrual status or otherwise deemed collateral dependent before the modification, a specific reserve may already be recorded. In periods subsequent to modification, the Company continues to evaluate all troubled debt restructurings for possible credit deterioration and recognizes credit loss through the allowance. Additionally, these loans continue to work their way through the credit cycle through charge-off, pay-off, or foreclosure. Financial effects of modifications of troubled debt restructurings may include principal loan forgiveness or other charge-offs directly related to the restructuring. The Company had no charge-offs directly related to modifying troubled debt restructurings during the three months ended March 31, 2020 or 2019 . The Company had no material troubled debt restructurings during the previous 12 months for which there was a payment default during the three months ended March 31, 2020 . The Company considers a payment default to occur on troubled debt restructurings when the loan is 90 days or more past due or is placed on non-accrual status after the modification. The terms of certain other loans were modified during the quarter ended March 31, 2020 that did not meet the definition of a troubled debt restructuring. These loans have a total recorded investment as of March 31, 2020 of $75.7 million . The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. 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 such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans individually to classify the loans as to credit risk. This analysis generally includes loans with an outstanding balance greater than $1.0 million which are generally considered non-homogeneous loans, such as commercial and commercial real estate loans. This analysis is performed no less than on an annual basis, dependent upon the size of exposure and the financial reporting frequency to which the borrower is contractually obligated to. Homogeneous loans, including small business loans are typically managed by payment performance. The Company adheres to a Uniform Classification System developed jointly by the various bank regulatory agencies to internally risk rate loans. 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 deserves 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 a well­ defined weakness or 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 to a point where collection or liquidation for full repayment, on the basis of currently existing facts, conditions and values, 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 to be pass-rated loans. The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale. Based on the most recent analysis performed, the risk category of loans by segment is as follows: March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial real estate non-owner occupied: Pass $ 99.7 $ 349.3 $ 259.5 $ 133.6 $ 176.3 $ 446.4 $ 20.5 $ 1,485.3 Special mention 15.4 3.7 0.7 0.9 1.7 13.2 — 35.6 Substandard 0.2 2.9 0.5 1.3 1.1 15.0 — 21.0 Doubtful — — 0.2 — — 0.1 — 0.3 Total $ 115.3 $ 355.9 $ 260.9 $ 135.8 $ 179.1 $ 474.7 $ 20.5 $ 1,542.2 Commercial real estate owner occupied: Pass $ 100.5 $ 348.8 $ 283.6 $ 170.0 $ 194.2 $ 459.0 $ 17.6 $ 1,573.7 Special mention 2.1 1.7 9.8 4.7 14.0 17.4 0.5 50.2 Substandard 6.6 10.1 9.7 5.6 19.3 19.9 0.6 71.8 Doubtful 0.2 — 0.2 0.1 0.5 0.5 — 1.5 Total $ 109.4 $ 360.6 $ 303.3 $ 180.4 $ 228.0 $ 496.8 $ 18.7 $ 1,697.2 Land, acquisition and development: Pass $ 38.3 $ 93.6 $ 53.9 $ 38.9 $ 12.4 $ 42.1 $ 5.9 $ 285.1 Special mention — 0.4 0.1 1.0 — 1.5 0.3 3.3 Substandard 0.1 0.1 0.3 0.5 — 0.5 0.4 1.9 Doubtful — — — — — 0.2 — 0.2 Total $ 38.4 $ 94.1 $ 54.3 $ 40.4 $ 12.4 $ 44.3 $ 6.6 $ 290.5 Residential construction: Pass $ 22.5 $ 121.8 $ 27.5 $ 6.9 $ 0.3 $ 0.4 $ 47.2 $ 226.6 Special mention — — 0.2 — — — — 0.2 Substandard — — 1.2 — — — — 1.2 Doubtful — — 0.4 — — — — 0.4 Total $ 22.5 $ 121.8 $ 29.3 $ 6.9 $ 0.3 $ 0.4 $ 47.2 $ 228.4 Commercial construction: Pass $ 51.9 $ 222.3 $ 139.3 $ 24.4 $ 10.0 $ 0.6 $ 7.7 $ 456.2 Special mention — — 1.5 — — — 0.2 1.7 Substandard — 1.0 0.4 — — 0.1 — 1.5 Doubtful — — — — — — — — Total $ 51.9 $ 223.3 $ 141.2 $ 24.4 $ 10.0 $ 0.7 $ 7.9 $ 459.4 Agricultural real estate: Pass $ 11.1 $ 57.1 $ 35.2 $ 22.3 $ 16.1 $ 36.7 $ 7.8 $ 186.3 Special mention 0.6 2.2 1.0 1.4 0.1 5.0 0.6 10.9 Substandard — 10.5 4.5 1.1 3.6 5.8 1.9 27.4 Doubtful — — — — — — — — Total $ 11.7 $ 69.8 $ 40.7 $ 24.8 $ 19.8 $ 47.5 $ 10.3 $ 224.6 March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial and floor plans: Pass $ 116.6 $ 247.2 $ 186.4 $ 120.9 $ 58.9 $ 118.1 $ 329.4 $ 1,177.5 Special mention 4.3 3.6 5.2 2.6 4.5 0.6 7.4 28.2 Substandard 10.5 21.7 8.8 0.9 5.2 5.7 18.7 71.5 Doubtful 0.1 1.7 0.4 0.2 — 0.4 0.4 3.2 Total $ 131.5 $ 274.2 $ 200.8 $ 124.6 $ 68.6 $ 124.8 $ 355.9 $ 1,280.4 Commercial purpose secured by 1-4 family: Pass $ 22.9 $ 74.1 $ 49.2 $ 29.4 $ 19.6 $ 63.5 $ 25.7 $ 284.4 Special mention 0.3 2.5 0.8 0.8 0.5 1.2 0.7 6.8 Substandard 0.3 3.7 6.2 0.5 1.3 1.7 0.1 13.8 Doubtful — 0.1 0.1 — — 0.2 — 0.4 Total $ 23.5 $ 80.4 $ 56.3 $ 30.7 $ 21.4 $ 66.6 $ 26.5 $ 305.4 Agricultural: Pass $ 19.3 $ 40.9 $ 18.8 $ 7.4 $ 4.5 $ 1.8 $ 131.2 $ 223.9 Special mention 1.1 0.4 1.8 — 0.1 — 6.0 9.4 Substandard 5.4 2.0 5.1 1.4 0.3 0.5 8.2 22.9 Doubtful — — — — — — — — Total $ 25.8 $ 43.3 $ 25.7 $ 8.8 $ 4.9 $ 2.3 $ 145.4 $ 256.2 The Company evaluates the credit quality, loan performance, and the allowance for credit loan losses of its residential and consumer loan portfolios, based primarily on the aging status of the loan and payment activity. Accordingly, loans on nonaccrual status, loans past due 90 days or more and still accruing interest, and loans modified under troubled debt restructurings are considered to be nonperforming for purposes of credit quality evaluation. The following tables present the recorded investment of our other loan portfolios based on the credit risk profile of loans that are performing and loans that are nonperforming as of the periods indicated: March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial multi-family: Performing $ 28.9 $ 78.5 $ 31.3 $ 32.4 $ 28.9 $ 102.9 $ 1.1 $ 304.0 Nonperforming — — — — — — — — Total $ 28.9 $ 78.5 $ 31.3 $ 32.4 $ 28.9 $ 102.9 $ 1.1 $ 304.0 Residential 1-4 family: Performing $ 33.8 $ 139.1 $ 103.1 $ 81.8 $ 96.5 $ 346.4 $ 0.2 $ 800.9 Nonperforming — 0.2 — — 0.6 1.2 — 2.0 Total $ 33.8 $ 139.3 $ 103.1 $ 81.8 $ 97.1 $ 347.6 $ 0.2 $ 802.9 Consumer home equity and HELOC: Performing $ 3.4 $ 12.4 $ 11.1 $ 14.6 $ 5.9 $ 22.0 $ 358.0 $ 427.4 Nonperforming — — 0.1 0.2 0.3 0.1 — 0.7 Total $ 3.4 $ 12.4 $ 11.2 $ 14.8 $ 6.2 $ 22.1 $ 358.0 $ 428.1 March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Consumer indirect: Performing $ 70.3 $ 267.3 $ 174.5 $ 115.6 $ 79.4 $ 66.3 $ — $ 773.4 Nonperforming — 0.4 0.4 0.1 0.1 0.2 — 1.2 Total $ 70.3 $ 267.7 $ 174.9 $ 115.7 $ 79.5 $ 66.5 $ — $ 774.6 Consumer direct and advance line: Performing $ 13.6 $ 44.9 $ 46.6 $ 20.0 $ 9.4 $ 13.4 $ 26.7 $ 174.6 Nonperforming — 0.1 0.1 0.1 0.1 — — 0.4 Total $ 13.6 $ 45.0 $ 46.7 $ 20.1 $ 9.5 $ 13.4 $ 26.7 $ 175.0 The Company considers the performance of the loan portfolio and its impact on the allowance for credit loan 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. The following table presents the recorded investment in credit card loans based on payment activity: As of March 31, 2020 Consumer Commercial Agricultural Total Credit Card: Performing $ 75.7 $ 73.4 $ 1.7 $ 150.8 Nonperforming 0.9 0.8 — 1.7 Total $ 76.6 $ 74.2 $ 1.7 $ 152.5 The following presents the recorded investment in the Company’s loans by risk grades and loan class as of the date shown below: As of December 31, 2019 Pass Other Assets Especially Mentioned Substandard Doubtful Total Criticized Loans Total Loans Real estate: Commercial $ 3,305.0 $ 84.7 $ 97.3 $ 0.8 $ 182.8 $ 3,487.8 Construction: Land acquisition & development 295.4 3.8 1.9 1.0 6.7 302.1 Residential 241.0 0.9 2.2 — 3.1 244.1 Commercial 428.3 1.7 1.5 — 3.2 431.5 Total construction loans 964.7 6.4 5.6 1.0 13.0 977.7 Residential 1,235.4 2.6 7.8 0.3 10.7 1,246.1 Agricultural 185.7 14.3 26.6 — 40.9 226.6 Total real estate loans 5,690.8 108.0 137.3 2.1 247.4 5,938.2 Consumer: Indirect consumer 781.5 0.2 2.9 — 3.1 784.6 Direct consumer 177.7 0.4 0.8 0.1 1.3 179.0 Credit card 81.6 — — — — 81.6 Total consumer loans 1,040.8 0.6 3.7 0.1 4.4 1,045.2 Commercial 1,569.4 40.4 60.3 3.6 104.3 1,673.7 Agricultural 247.8 8.5 22.7 0.1 31.3 279.1 Total $ 8,548.8 $ 157.5 $ 224.0 $ 5.9 $ 387.4 $ 8,936.2 There were no material purchases of portfolio loans and no material sales of loan held for investment during the three months ended March 31, 2020 or 2019 . Purchased credit deteriorated loans The Company has purchased loans acquired in business combinations, for which there was, at acquisition, evidence of more than insignificant deterioration of credit quality since origination. See “Note 2 - Acquisitions” included in this report, for additional details.

Other Real Estate Owned

Other Real Estate Owned	3 Months Ended
	Mar. 31, 2020
Repossessed Assets [Abstract]
Other Real Estate Owned	Other Real Estate Owned Information with respect to the Company’s other real estate owned follows: Three Months Ended March 31, 2020 2019 Beginning balance $ 8.5 $ 14.4 Additions 0.9 8.4 Valuation adjustments — (0.3 ) Dispositions (1.2 ) (1.4 ) Ending balance $ 8.2 $ 21.1 The carrying values of foreclosed residential real estate properties included in other real estate owned were $3.1 million and $2.3 million as of March 31, 2020 and December 31, 2019 , respectively. The Company had recorded investments in consumer mortgage loans secured by residential real estate for which formal foreclosure proceedings were in process of foreclosure of $0.8 million and $1.4 million as of March 31, 2020 and December 31, 2019 , respectively.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	Derivatives and Hedging Activities The Company 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. 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 closed loans if interest rates change between the time of the interest rate lock and the delivery of the loan to the investor. Loan commitments related to residential mortgage loans intended to be sold are considered derivatives and are marked to market through earnings. In addition to the effects of the change in market interest rate, the fair value measurement of the derivative also contemplates the expected cash flows to be received from the counterparty from the future sale of the loan. 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. During the interest rate lock commitment period, these forward loan sales contracts are marked to market 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. The notional amounts and estimated fair values of the Company’s derivatives are presented in the following table. Fair value estimates are obtained from third parties and are based on pricing models. March 31, 2020 December 31, 2019 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Derivative Assets (included in other assets on the consolidated balance sheets): Non-hedging interest rate derivatives: Interest rate swap contracts $ 536.0 $ 57.4 $ 503.2 $ 21.9 Interest rate lock commitments 361.2 7.7 67.8 1.3 Total derivative assets $ 897.2 $ 65.1 $ 571.0 $ 23.2 Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets): Non-hedging interest rate derivatives: Interest rate swap contracts $ 536.0 $ 57.4 $ 503.2 $ 21.9 Forward loan sales contracts 377.2 2.1 128.0 0.3 Total derivative liabilities $ 913.2 $ 59.5 $ 631.2 $ 22.2 Derivative assets and liabilities are recorded at fair value on the balance sheet and do not take into account the effects of master netting arrangements. Master netting arrangements allow the Company to settle all contracts held with a single counterparty on a net basis and to offset net contract position with related collateral where applicable. The following table illustrates the potential effect of the Company’s master netting arrangements, by type of financial instrument, on the Company’s consolidated balance sheets as of March 31, 2020 and December 31, 2019 : March 31, 2020 Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet Net Amounts in the Balance Sheet Financial Instruments Fair Value of Financial Collateral in the Balance Sheet Net Amount Financial Assets Interest rate swap contracts $ 57.4 $ — $ 57.4 $ — $ 35.1 $ 22.3 Mortgage related derivatives 7.7 — 7.7 — — 7.7 Total derivatives 65.1 — 65.1 — 35.1 30.0 Total assets $ 65.1 $ — $ 65.1 $ — $ 35.1 $ 30.0 Financial Liabilities Interest rate swap contracts $ 57.4 $ — $ 57.4 $ — $ — $ 57.4 Mortgage related derivatives 2.1 — 2.1 — — 2.1 Total derivatives 59.5 — 59.5 — — 59.5 Repurchase agreements 614.1 614.1 — 614.1 — Total liabilities $ 673.6 $ — $ 673.6 $ — $ 614.1 $ 59.5 December 31, 2019 Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet Net Amounts in the Balance Sheet Financial Instruments Fair Value of Financial Collateral in the Balance Sheet Net Amount Financial Assets Interest rate swap contracts $ 21.9 $ — $ 21.9 $ 0.1 $ 18.0 $ 3.8 Mortgage related derivatives 1.3 — 1.3 — — 1.3 Total derivatives 23.2 — 23.2 0.1 18.0 5.1 Total assets $ 23.2 $ — $ 23.2 $ 0.1 $ 18.0 $ 5.1 Financial Liabilities Interest rate swap contracts $ 21.9 $ — $ 21.9 $ 0.1 $ — $ 21.8 Mortgage related derivatives 0.3 — 0.3 — — 0.3 Total derivatives 22.2 — 22.2 0.1 — 22.1 Repurchase agreements 697.6 — 697.6 — 697.6 — Total liabilities $ 719.8 $ — $ 719.8 $ 0.1 $ 697.6 $ 22.1 The following table presents the pre-tax gains or losses related to derivative contracts that were recorded in other non-interest income in the Company’s statements of income for the periods indicated: Three Months Ended March 31, 2020 2019 Non-hedging interest rate derivatives: Amount of net fee income recognized in other non-interest income $ 1.0 $ 0.8 Amount of net gains recognized in mortgage banking revenues 4.5 0.4

Capital Stock

Capital Stock	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Capital Stock	Capital Stock The Company had 42,465,637 shares of Class A common stock and 22,086,944 shares of Class B common stock outstanding as of March 31, 2020 . The Company had 43,129,085 shares of Class A common stock and 22,117,254 shares of Class B common stock outstanding as of December 31, 2019 . During the three months ended March 31, 2020 , we repurchased and retired 1,054,700 shares of our Class A common stock at a total cost of $31.2 million and an average cost of $29.56 per share. The shares of common stock repurchased during the period represented 42.2% of the total shares to be repurchased under our repurchase program adopted by the Company’s board of directors on June 11, 2019 whereby the Company may repurchase up to 2.5 million of its outstanding shares of Class A common stock. The cost of our repurchased shares directly reduced the balance of stockholders’ equity at March 31, 2020 . As of March 31, 2020 , there were 1,445,300 shares remaining authorized under the repurchase program. During the three months ended March 31, 2020 , the Company issued 291 shares of its Class A common stock to a director for service on the Company's board of directors. The aggregate value of the shares issued to the director is included in stock-based compensation expense in the accompanying consolidated statements of changes in stockholders' equity. All other stock repurchases during the three months ended March 31, 2020 and 2019 , 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. On March 16, 2020, 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	3 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Earnings per Common Share	Earnings per Common Share Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period presented, excluding unvested restricted stock. Diluted earnings per share is calculated by dividing net income by the weighted average number of common shares determined for the basic earnings per share computation plus the dilutive effects of stock-based compensation using the treasury stock method. The following table sets forth the computation of basic and diluted earnings per share for the three month period ended March 31, 2020 and 2019 : Three Months Ended March 31, 2020 2019 Net income $ 29.3 $ 41.6 Weighted average common shares outstanding for basic earnings per share computation 64,790,186 60,311,171 Dilutive effects of stock-based compensation 146,921 286,899 Weighted average common shares outstanding for diluted earnings per common share computation 64,937,107 60,598,070 Basic earnings per common share $ 0.45 $ 0.69 Diluted earnings per common share $ 0.45 $ 0.69 Anti-dilutive unvested time restricted stock 113,468 121,452 The Company had 309,410 and 154,387 shares of unvested restricted stock as of March 31, 2020 and 2019

Regulatory Capital

Regulatory Capital	3 Months Ended
	Mar. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]
Regulatory Capital	Regulatory Capital As of March 31, 2020 and December 31, 2019 , the Company exceeded all capital adequacy requirements to which it is subject. Actual capital amounts and ratios for the Company and its subsidiary Bank, as of March 31, 2020 and December 31, 2019 are presented in the following tables: Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1) March 31, 2020 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 1,460.3 13.67 % $ 854.8 8.000 % $ 1,121.9 10.50 % $ 1,068.5 10.00 % FIB 1,339.7 12.58 852.3 8.000 1,118.6 10.50 1,065.3 10.00 Tier 1 risk-based capital: Consolidated 1,367.7 12.80 641.1 6.000 908.2 8.50 854.8 8.00 FIB 1,247.1 11.71 639.2 6.000 905.5 8.50 852.3 8.00 Common equity tier 1 risk-based capital: Consolidated 1,283.6 12.01 480.8 4.500 747.9 7.00 694.5 6.50 FIB 1,247.1 11.71 479.4 4.500 745.7 7.00 692.5 6.50 Leverage capital ratio: Consolidated 1,367.7 9.90 552.5 4.000 552.5 4.00 690.6 5.00 FIB 1,247.1 9.05 551.2 4.000 551.2 4.00 689.0 5.00 In connection with the adoption of ASC 326, we recognized an after-tax cumulative effect reduction to retained earnings totaling $24.1 million . In March 2020, the Office of the Comptroller of Currency, the Board of Governors of the Federal Reserve System, and the FDIC issued an interim final rule that allows banking organizations to mitigate the effects of ASC 326 on their regulatory capital computations. This interim rule is in addition to the three-year transition period already in place under the capital transition rule previously issued in February 2019. Banking organizations can elect to mitigate the estimated cumulative regulatory capital effects for an additional two years. This rule allows an institution to defer transitioning the impact of ASC 326 into its regulatory capital calculation, including ratios, over an extended period. Additionally, the interim rule extends the transition period whereby an institution can defer the impact from ASC 326 on the current period, determined based on the difference between the new ASC 326 allowance for credit losses and the allowance for loan losses under the incurred loss method from previous GAAP, for up to two years. The total impact related to ASC 326 would then be transitioned into regulatory capital and the associated ratios over a three-year transition period, beginning after the initial two-year deferral period, for a total transition period of five years. The Company has elected to opt into the transition election and is adopting transition relief over the permissible five-year period. Accordingly, a CECL transitional amount totaling $29.0 million has been added back to CET1. The CECL transitional amount includes $30.0 million related to the cumulative effect of adopting CECL and $6.5 million related to the estimated regulatory incremental effect of CECL during the three months ended March 31, 2020. Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1) December 31, 2019 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 1,495.3 14.10 % $ 848.5 8.00 % $ 1,113.6 10.50 % $ 1,060.6 10.00 % FIB 1,321.4 12.50 845.8 8.00 1,110.1 10.50 1,057.2 10.00 Tier 1 risk-based capital: Consolidated 1,422.3 13.41 636.3 6.00 901.5 8.50 848.5 8.00 FIB 1,248.4 11.81 634.3 6.00 898.6 8.50 845.8 8.00 Common equity tier 1 risk-based capital: Consolidated 1,338.2 12.62 477.3 4.50 742.4 7.00 689.4 6.50 FIB 1,248.4 11.81 475.7 4.50 740.0 7.00 687.2 6.50 Leverage capital ratio: Consolidated 1,422.3 10.13 561.6 4.00 561.6 4.00 702.0 5.00 FIB 1,248.4 8.91 560.4 4.00 560.4 4.00 700.4 5.00 (1) The ratios for 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.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the normal course of business, the Company is involved in various other claims and litigation. In the opinion of management, following consultation with legal counsel, the ultimate liability or disposition thereof of all other claims and litigation is not expected to have a material adverse effect on the consolidated financial condition, results of operations or liquidity of the Company. As of March 31, 2020 , the Company had commitments under construction contracts of $4.9 million . Residential mortgage loans sold to investors in the secondary market are sold with varying recourse provisions. Essentially all of the loan sales agreements require the repurchase of a mortgage loan by the seller in situations such as breach of representation, warranty, or covenant; untimely document delivery; false or misleading statements; failure to obtain certain certificates or insurance; or unmarketability. Certain loan sales agreements contain repurchase requirements based on payment-related defects that are defined in terms of the number of days or months since the purchase, the sequence number of the payment, and/or the number of days of payment delinquency. Based on the specific terms stated in the agreements, the Company had $1.2 million of sold residential mortgage loans with recourse provisions still in effect as of March 31, 2020

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	3 Months Ended
	Mar. 31, 2020
Financial Instruments with Off-Balance Sheet Risk [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its clients. These financial instruments include commitments to extend credit and standby letters of credit. Commitments to extend credit are agreements to lend to a client as 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 following table presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments: Three Months Ended March 31, 2020 2019 Beginning balance, prior to adoption of ASC 326 $ — $ — Impact of adopting ASC 326 2.3 — Provision for credit loss expense (0.2 ) — Ending balance of allowance for off-balance sheet credit losses $ 2.1 $ — March 31, December 31, Unused credit card lines* $ 1,480.5 $ 1,450.5 Commitments to extend credit* 2,122.4 2,067.0 Standby letter of credit 56.2 42.7 * In conjunction with the adoption of ASC 326, the Company presented the December 31, 2019 balances to conform to the March 31, 2020 presentation.

Other Comprehensive Income_Loss

Other Comprehensive Income/Loss	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Other Comprehensive Income/Loss	Other Comprehensive Income/Loss The gross amounts of each component of other comprehensive income and the related tax effects are as follows: Pre-tax Tax Expense (Benefit) Net of Tax Three Months Ended March 31, 2020 2019 2020 2019 2020 2019 Investment securities available-for sale: Change in net unrealized gains during period $ 39.2 $ 33.6 $ 10.3 $ 8.8 $ 28.9 $ 24.8 Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale — (6.0 ) — (1.6 ) — (4.4 ) Defined benefits post-retirement benefit plan: Change in net actuarial gains (0.2 ) (0.2 ) (0.1 ) — (0.1 ) (0.2 ) Total other comprehensive income $ 39.0 $ 27.4 $ 10.2 $ 7.2 $ 28.8 $ 20.2 The components of accumulated other comprehensive loss, net of related tax effects, are as follows: March 31, 2020 December 31, 2019 Net unrealized gains on investment securities available-for-sale $ 39.6 $ 10.6 Net actuarial gains on defined benefit post-retirement benefit plans 0.2 0.4 Net accumulated other comprehensive gains $ 39.8 $ 11.0

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value are as follows: • Level 1 - Quoted prices in active markets for identical assets or liabilities • Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities • Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of assets or liabilities The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date, and therefore are classified within Level 2 of the valuation hierarchy. There have been no significant changes in the valuation techniques during the three months ended March 31, 2020 and 2019 . The Company’s policy is to recognize transfers between levels as of the end of the reporting period. Transfers in and out of Level 1, Level 2 and Level 3 are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the three months ended March 31, 2020 and 2019 . Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below: Investment Debt Securities Available-for-Sale . The Company obtains fair value measurements for investment securities from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. If needed, a broker may be utilized to determine the reported fair value of investment securities. Loans Held for Sale. Fair value measurements for 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. Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data. The inputs used to determine fair value include the three-month LIBOR forward curve to estimate variable rate cash inflows and the federal funds effective swap rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The change in the value of derivative assets attributable to basis risk, or the risk that offsetting investments in a hedging strategy will not experience price changes in entirely opposite directions from each other, was not significant in the reported periods. The Company also obtains and compares the reasonableness of the pricing from an independent third party. 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 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 liabilities measured at fair value on a recurring basis are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2020 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment debt securities available-for-sale: U.S. Treasury Notes $ 17.1 $ — $ 17.1 $ — State, county and municipal securities 112.3 — 112.3 — Obligations of U.S. government agencies 203.6 — 203.6 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 2,414.8 — 2,414.8 — Private mortgage-backed securities 40.0 — 40.0 — Corporate securities 210.5 — 210.5 — Other investments 2.0 — 2.0 — Loans held for sale 94.4 — 94.4 — Derivative assets: Interest rate swap contracts 57.4 — 57.4 — Interest rate lock commitments 7.7 — 7.7 — Derivative liabilities: Interest rate swap contracts 57.4 — 57.4 — Forward loan sale contracts 2.1 — 2.1 — Deferred compensation plan assets 17.3 — 17.3 — Deferred compensation plan liabilities 17.3 — 17.3 — Fair Value Measurements at Reporting Date Using As of December 31, 2019 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment debt securities available-for-sale: U.S. Treasury notes $ 9.0 $ — $ 9.0 $ — State, county and municipal securities 80.9 — 80.9 — Obligations of U.S. government agencies 366.8 — 366.8 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 2,317.2 — 2,317.2 — Private mortgage-backed securities 47.2 — 47.2 — Corporate securities 135.7 — 135.7 — Other investments 3.2 — 3.2 — Loans held for sale 100.9 — 100.9 — Derivative assets: Interest rate swap contracts 21.9 — 21.9 — Interest rate lock commitments 1.3 — 1.3 — Derivative liabilities Interest rate swap contracts 21.9 — 21.9 — Forward loan sales contracts 0.3 — 0.3 — Deferred compensation plan assets 18.2 — 18.2 — Deferred compensation plan liabilities 18.2 — 18.2 — Additionally, from time to time, certain assets are measured at fair value on a non-recurring basis. Adjustments to fair value generally result from the application of lower-of-cost-or-market accounting or write-downs of individual assets due to credit deterioration. The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis: Fair Value Measurements at Reporting Date Using As of March 31, 2020 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Collateral dependent loans* $ 3.6 $ — $ — $ 3.6 Other real estate owned 2.3 — — 2.3 Long-lived assets to be disposed of by sale 5.0 — — 5.0 Fair Value Measurements at Reporting Date Using As of December 31, 2019 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired Loans* $ 27.3 $ — $ — $ 27.3 Other real estate owned 2.2 — — 2.2 Long-lived assets to be disposed of by sale 6.2 — — 6.2 *The Company adopted ASC 326 as of January 1, 2020 which changes the methodology of impaired loans. The comparable period presents impaired loans under previously applicable GAAP. Collateral dependent Loans. Collateral dependent loans are reported at the fair value of the underlying collateral if repayment is expected solely from collateral. The collateral dependent loans are reported at fair value through specific valuation allowance allocations. In addition, when it is determined that the fair value of a collateral dependent loan is less than the recorded investment in the loan, the carrying value of the loan is adjusted to fair value through a charge to the allowance for credit losses. Collateral values are estimated using independent appraisals and management estimates of current market conditions. As of March 31, 2020 , certain collateral dependent loans with a carrying value of $5.9 million were reduced by specific valuation allowance allocations of $2.1 million and partial loan charge-offs of $0.2 million resulting in a reported fair value of $3.6 million . As of December 31, 2019 , certain impaired loans with a carrying value of $41.3 million were reduced by specific valuation allowance allocations of $3.6 million and partial loan charge-offs of $10.1 million resulting in a reported fair value of $27.6 million . 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 zero and $0.3 million of write downs on OREO properties during the three months ended March 31, 2020 and 2019 , respectively. Long-lived Assets to be Disposed of by Sale. Long-lived assets to be disposed of by sale are carried at the lower of carrying value or fair value less estimated costs to sell. The fair values of long-lived assets to be disposed of by sale are based upon observable market data and management estimates of current market conditions. As of March 31, 2020 , the Company had long-lived assets to be disposed of by sale with carrying values aggregating $5.2 million , which was reduced by write-downs of $0.2 million , resulting in a fair value of $5.0 million . As of December 31, 2019 , the Company had long-lived assets to be disposed of by sale with carrying values aggregating $6.4 million , reduced by write-downs of $0.2 million , resulting in a fair value of $6.2 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 March 31, 2020 December 31, 2019 Valuation Technique Unobservable Inputs Range (Weighted Average) Collateral dependent loans $ 3.6 $ 27.3 Appraisal Appraisal adjustment 0% - 56% (22%) Other real estate owned 2.3 2.2 Appraisal Appraisal adjustment 8% - 65% (27%) Long-lived assets to be disposed of by sale 5.0 6.2 Appraisal Appraisal adjustment 0% - 37% (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 payable on demand at the reporting date. The fair values of fixed-maturity certificates of deposit are estimated using external market rates currently offered for deposits with similar remaining maturities. The fair values of derivative liabilities are obtained from an independent pricing service, which considers observable data that may include the three-month LIBOR forward curve, the federal funds effective swap rate and cash flows, among other things. The carrying values of the interest-bearing demand notes to the United States Treasury are deemed an approximation of fair values due to the frequent repayment and repricing at market rates. The fixed and floating rate subordinated debentures, floating rate subordinated term loan, notes payable to the FHLB, fixed rate subordinated term debt, and capital lease obligation are estimated by discounting future cash flows using current rates for advances with 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, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2020 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 869.2 $ 869.2 $ 869.2 $ — $ — Investment debt securities available-for-sale 3,000.3 3,000.3 — 3,000.3 — Investment debt securities held-to-maturity 70.2 72.6 — 72.6 — Accrued interest receivable 46.3 46.3 — 46.3 — Mortgage servicing rights, net 27.8 27.8 — 27.8 — Loans held for sale 94.4 94.4 — 94.4 — Net loans held for investment 8,788.9 8,856.5 — 8,852.9 3.6 Derivative assets 65.1 65.1 — 65.1 — Deferred compensation plan assets 17.3 17.3 — 17.3 — Total financial assets $ 12,979.5 $ 13,049.5 $ 869.2 $ 12,176.7 $ 3.6 Financial liabilities: Total deposits, excluding time deposits $ 10,244.5 $ 10,244.5 $ 10,244.5 $ — $ — Time deposits 1,320.6 1,324.9 — 1,324.9 — Securities sold under repurchase agreements 614.1 614.1 — 614.1 — Accrued interest payable 10.3 10.3 — 10.3 — Long-term debt 13.9 10.5 — 10.5 — Subordinated debentures held by subsidiary trusts 86.9 81.5 — 81.5 — Derivative liabilities 59.5 59.5 — 59.5 — Deferred compensation plan liabilities 17.3 17.3 — 17.3 — Total financial liabilities $ 12,367.1 $ 12,362.6 $ 10,244.5 $ 2,118.1 $ — Fair Value Measurements at Reporting Date Using As of December 31, 2019 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 1,076.8 $ 1,076.8 $ 1,076.8 $ — $ — Investment debt securities available-for-sale 2,960.0 2,960.0 — 2,960.0 — Investment debt securities held-to-maturity 92.3 94.5 — 94.5 — Accrued interest receivable 46.7 46.7 — 46.7 — Mortgage servicing rights, net 30.2 34.8 — 34.8 — Loans held for sale 100.9 100.9 — 100.9 — Net loans held for investment 8,857.7 8,930.7 — 8,906.7 24.0 Derivative assets 23.2 23.2 — 23.2 — Deferred compensation plan assets 18.2 18.2 — 18.2 — Total financial assets $ 13,206.0 $ 13,285.8 $ 1,076.8 $ 12,185.0 $ 24.0 Financial liabilities: Total deposits, excluding time deposits $ 10,213.5 $ 10,213.5 $ 10,213.5 $ — $ — Time deposits 1,450.0 1,446.6 — 1,446.6 — Securities sold under repurchase agreements 697.6 697.6 — 697.6 — Accrued interest payable 12.1 12.1 — 12.1 — Long-term debt 13.9 10.4 — 10.4 — Subordinated debentures held by subsidiary trusts 86.9 81.3 — 81.3 — Derivative liabilities 22.2 22.2 — 22.2 — Deferred compensation plan liabilities 18.2 18.2 — 18.2 — Total financial liabilities $ 12,514.4 $ 12,501.9 $ 10,213.5 $ 2,288.4 $ —

Recent Authoritative Accounting

Recent Authoritative Accounting Guidance	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Recent Authoritative Accounting Guidance	Recent Authoritative Accounting Guidance ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments in ASU 2016-13 require a financial asset or group of financial assets measured at amortized cost basis to be presented on a company’s financial statements at the net amount expected to be collected based on historical experience, current conditions and reasonable and supportable forecasts. ASU 2016-13 requires a company’s income statement to reflect the measurement of credit losses for newly recognized financial assets as well as the expected increases or decreases of expected credit losses that have taken place during the period. The amendments in ASU 2016-13 require that the allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination be measured at amortized cost basis with the initial allowance for credit losses added to the purchase price rather than being reported as a credit loss expense. ASU 2016-13 also requires that credit losses relating to available-for-sale debt securities be recorded through an allowance for credit losses. The amendments in ASU 2016-13 are effective for the Company for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. A prospective transition approach is required for debt securities for which other-than-temporary impairment was recognized before the effective date. On January 1, 2020, the Company adopted ASC 326 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. The adoption of ASU 2016-13 resulted in an increase in the allowance for loan losses as a result of changing from the “incurred loss” model, which encompassed allowances for current known and inherent losses within the portfolio, to the “expected loss” model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. The amendments, as applied to our debt securities, had no material impact.The amendments were applied through a cumulative-effect adjustment to retained earnings of $24.1 million as of January 1, 2020. The transition adjustment includes an increase in the allowance for credit losses on loans of $30.0 million and an increase in the allowance for credit losses on off-balance sheet credit exposures of $2.3 million , net of the corresponding increases in deferred tax assets of $8.2 million . The Company adopted ASC 326 using the prospective transition approach for PCD financial assets, previously classified as purchased credit impaired, or PCI, and accounted for under ASC 310-30. In accordance with the standard, the Company did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption. The remaining discount on the PCD assets was determined to be related to noncredit factors and will be accreted into interest income on a level-yield method over the life of the loans. The Company has elected to opt into the transition election to mitigate the effects of ASC 326 on the regulatory capital ratios relative to recent legislation in relief of COVID‑19 pandemic on the economy and financial institutions in the United States. The referenced relief allows a total five-year phase in of the CECL impact on capital and relief over the next two years for the impact on the allowance for credit losses resulting from COVID‑19. Refer to “Note 9 - Regulatory Capital” for additional details of the election. ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement: Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13). The amendments in this Update removes, modifies, and adds to the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in the Concepts Statement, including the consideration of costs and benefits. The amendments in this Update are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The amendments in this Update became effective for the Company on January 1, 2020, and as the amendment is a revision to the disclosure requirements did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General: Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans (ASU 2018-14). The amendments in this Update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. Although narrow in scope, the amendments are considered an important part of the Board’s efforts to improve the effectiveness of disclosures in the notes to financial statements by applying concepts in the Concepts Statement. The amendments in this Update are effective for fiscal years ending after December 15, 2020, for public business entities. Early adoption is permitted. While the Company continues to assess all potential impacts of the standard, we currently expect adoption to have an immaterial impact on our consolidated financial statements disclosures. ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other- Internal-Use Software (Subtopic 350-40). The amendments in this Update clarifies certain aspects of ASU 2015-05, “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement,” which was issued in April 2015. ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the Update. The amendments in this Update are effective for fiscal years beginning after December 15, 2019, for public business entities. The amendments in this Update became effective for the Company on January 1, 2020 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments” In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, that clarifies and improves areas of guidance related to the recently issued standards on credit losses (ASU 2016-13), hedging (ASU 2017-12), and recognition and measurement of financial instruments (ASU 2016-01). The amendments generally have the same effective dates as their related standards. If already adopted, the amendments of ASU 2016-01 and ASU 2016-13 are effective for fiscal years beginning after December 15, 2019 and the amendments of ASU 2017-12 are effective as of the beginning of the Company’s next annual reporting period; early adoption is permitted. The Company previously adopted both ASU 2017-12 and ASU 2016-01 and the amendments of ASU 2019-04 became effective upon adoption of ASU 2016-13.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent events have been evaluated for potential recognition and disclosure through the date financial statements were filed with the SEC. On April 29, 2020 , the Company declared a quarterly dividend to common shareholders of $0.34 per share, to be paid on May 21, 2020 to shareholders of record as of May 11, 2020 . The COVID-19 pandemic has seemingly triggered a period of material global economic slowdown which could be deemed to constitute or lead to a global recession. As a result, economic uncertainties have arisen which are likely to negatively impact revenues and have other potential financial impacts on our position that are not yet known. Management has actively worked to minimize the current and future impact of this unprecedented situation and has made adjustments to operations where appropriate or necessary to help slow the spread of COVID-19. The extent to which COVID-19 impacts the Company’s financial results will depend on a number of things including the extent of the spread of the virus, the rate of infection, the severity of illness and the degree of lethality, the relative effect on various portions of the population, the measures taken to combat the virus and their effectiveness, the effect on international trade of any measures taken to combat the virus, any action taken (such as the lowering of interest rates) by government entities to combat the negative macroeconomic effects of these measures, the timing and availability of any treatments or vaccines for the virus, any possible resurgence of the COVID-19 virus after the initial outbreak, and other factors. There are no comparable recent events that may provide guidance as to the effect of the spread of COVID-19 and the resulting pandemic, and, as a result, there is considerable uncertainty of its potential effect. As part of the U.S. government’s response to COVID-19, the CARES Act enacted a number of measures to mitigate the impact of the COVID-19 pandemic on the U.S. economy. For instance, the CARES Act created a new guaranteed, unsecured loan program under the Small Business Administration, or SBA, called the Payroll Protection Program, or the PPP, which the Company participates in, designed to provide a direct incentive for sole proprietors, independent contractors, self-employed persons, non-profits, and small businesses with less than 500 employees, allowing for narrow exceptions with businesses greater than 500 employees, to keep their workers on the payroll during the pandemic period. The Company is actively participating in assisting our customers with applications for resources through the program and through Phase I approved more than 6,800 applications, for approximately $1.0 billion . The CARES Act permits financial institutions to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 and is intended to provide interpretive guidance as to conditions that would constitute a short-term modification that would not meet the definition of a TDR. As of April 27, 2020 the Company has implemented modifications on approximately 3,950 loans totaling approximately $1.1 billion and anticipates that it will continue to experience an increase in short-term modifications. Additionally, the Company has granted forbearance requests on approximately 133 residential mortgage loans totaling $46.6 million . No other undisclosed events requiring recognition or disclosure were identified.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants at the measurement date. There is a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value are as follows: • Level 1 - Quoted prices in active markets for identical assets or liabilities • Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities • Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of assets or liabilities The methodologies used by the Company in determining the fair values of each class of financial instruments are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date, and therefore are classified within Level 2 of the valuation hierarchy. There have been no significant changes in the valuation techniques during the three months ended March 31, 2020 and 2019 . The Company’s policy is to recognize transfers between levels as of the end of the reporting period. Transfers in and out of Level 1, Level 2 and Level 3 are recognized on the actual transfer date. There were no transfers between fair value hierarchy levels during the three months ended March 31, 2020 and 2019 . Further details on the methods used to estimate the fair value of each class of financial instruments above are discussed below: Investment Debt Securities Available-for-Sale . The Company obtains fair value measurements for investment securities from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the investment’s terms and conditions, among other things. Vendors chosen by the Company are widely recognized vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. If needed, a broker may be utilized to determine the reported fair value of investment securities. Loans Held for Sale. Fair value measurements for 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. Interest Rate Swap Contracts. Fair values for derivative interest rate swap contracts are based upon the estimated amounts to settle the contracts considering current interest rates and are calculated using discounted cash flows that are observable or that can be corroborated by observable market data. The inputs used to determine fair value include the three-month LIBOR forward curve to estimate variable rate cash inflows and the federal funds effective swap rate to estimate the discount rate. The estimated variable rate cash inflows are compared to the fixed rate outflows and such difference is discounted to a present value to estimate the fair value of the interest rate swaps. The change in the value of derivative assets attributable to basis risk, or the risk that offsetting investments in a hedging strategy will not experience price changes in entirely opposite directions from each other, was not significant in the reported periods. The Company also obtains and compares the reasonableness of the pricing from an independent third party. 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 are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected in an orderly transaction between market participants at the measurement date. These investments are in the same funds and purchased in the same amounts as the participants’ selected investments, which represent the underlying liabilities to plan participants. Deferred compensation plan liabilities are recorded at amounts due to participants, based on the fair value of participants’ selected investments.
Recent Authoritative Accounting Guidance	Recent Authoritative Accounting Guidance ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The amendments in ASU 2016-13 require a financial asset or group of financial assets measured at amortized cost basis to be presented on a company’s financial statements at the net amount expected to be collected based on historical experience, current conditions and reasonable and supportable forecasts. ASU 2016-13 requires a company’s income statement to reflect the measurement of credit losses for newly recognized financial assets as well as the expected increases or decreases of expected credit losses that have taken place during the period. The amendments in ASU 2016-13 require that the allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination be measured at amortized cost basis with the initial allowance for credit losses added to the purchase price rather than being reported as a credit loss expense. ASU 2016-13 also requires that credit losses relating to available-for-sale debt securities be recorded through an allowance for credit losses. The amendments in ASU 2016-13 are effective for the Company for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. A prospective transition approach is required for debt securities for which other-than-temporary impairment was recognized before the effective date. On January 1, 2020, the Company adopted ASC 326 using the modified retrospective method for all financial assets measured at amortized cost and off-balance sheet credit exposures. The adoption of ASU 2016-13 resulted in an increase in the allowance for loan losses as a result of changing from the “incurred loss” model, which encompassed allowances for current known and inherent losses within the portfolio, to the “expected loss” model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. The amendments, as applied to our debt securities, had no material impact.The amendments were applied through a cumulative-effect adjustment to retained earnings of $24.1 million as of January 1, 2020. The transition adjustment includes an increase in the allowance for credit losses on loans of $30.0 million and an increase in the allowance for credit losses on off-balance sheet credit exposures of $2.3 million , net of the corresponding increases in deferred tax assets of $8.2 million . The Company adopted ASC 326 using the prospective transition approach for PCD financial assets, previously classified as purchased credit impaired, or PCI, and accounted for under ASC 310-30. In accordance with the standard, the Company did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption. The remaining discount on the PCD assets was determined to be related to noncredit factors and will be accreted into interest income on a level-yield method over the life of the loans. The Company has elected to opt into the transition election to mitigate the effects of ASC 326 on the regulatory capital ratios relative to recent legislation in relief of COVID‑19 pandemic on the economy and financial institutions in the United States. The referenced relief allows a total five-year phase in of the CECL impact on capital and relief over the next two years for the impact on the allowance for credit losses resulting from COVID‑19. Refer to “Note 9 - Regulatory Capital” for additional details of the election. ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement: Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (ASU 2018-13). The amendments in this Update removes, modifies, and adds to the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in the Concepts Statement, including the consideration of costs and benefits. The amendments in this Update are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The amendments in this Update became effective for the Company on January 1, 2020, and as the amendment is a revision to the disclosure requirements did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” In August 2018, the FASB issued ASU 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General: Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans (ASU 2018-14). The amendments in this Update remove disclosures that no longer are considered cost beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. Although narrow in scope, the amendments are considered an important part of the Board’s efforts to improve the effectiveness of disclosures in the notes to financial statements by applying concepts in the Concepts Statement. The amendments in this Update are effective for fiscal years ending after December 15, 2020, for public business entities. Early adoption is permitted. While the Company continues to assess all potential impacts of the standard, we currently expect adoption to have an immaterial impact on our consolidated financial statements disclosures. ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other- Internal-Use Software (Subtopic 350-40). The amendments in this Update clarifies certain aspects of ASU 2015-05, “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement,” which was issued in April 2015. ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the Update. The amendments in this Update are effective for fiscal years beginning after December 15, 2019, for public business entities. The amendments in this Update became effective for the Company on January 1, 2020 and did not have a significant impact on the Company’s consolidated financial statements, results of operations, or liquidity. ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments” In April 2019, the FASB issued ASU 2019-04, Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, that clarifies and improves areas of guidance related to the recently issued standards on credit losses (ASU 2016-13), hedging (ASU 2017-12), and recognition and measurement of financial instruments (ASU 2016-01). The amendments generally have the same effective dates as their related standards. If already adopted, the amendments of ASU 2016-01 and ASU 2016-13 are effective for fiscal years beginning after December 15, 2019 and the amendments of ASU 2017-12 are effective as of the beginning of the Company’s next annual reporting period; early adoption is permitted. The Company previously adopted both ASU 2017-12 and ASU 2016-01 and the amendments of ASU 2019-04 became effective upon adoption of ASU 2016-13.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the consideration paid, fair values of the IIBK assets acquired and liabilities assumed, and the resulting goodwill. All amounts reported were finalized during the fourth quarter of 2019. As Recorded Fair Value As Recorded As of April 8, 2019 by IIBK Adjustments by the Company Assets acquired: Cash and cash equivalents $ 270.7 $ — $ 270.7 Investment securities 62.7 0.5 (1) 63.2 Loans held for investment 347.6 (9.8 ) (2) 337.8 Mortgage loans held for sale 0.5 — 0.5 Allowance for loan loss (6.3 ) 6.3 (3) — Premises and equipment 16.5 4.8 (4) 21.3 Other real estate owned (“OREO”) 0.4 2.0 (5) 2.4 Company owned life insurance 15.2 — 15.2 Core deposit intangible assets — 13.6 (6) 13.6 Deferred tax assets, net 3.2 (2.6 ) (7) 0.6 Other assets 8.6 (0.7 ) (8) 7.9 Total assets acquired 719.1 14.1 733.2 Liabilities assumed: Deposits 596.5 0.1 (9) 596.6 Accounts payable and accrued expense 15.2 2.6 (10) 17.8 Other borrowed funds 4.0 0.1 (11) 4.1 Securities sold under repurchase agreements 30.4 — 30.4 Total liabilities assumed 646.1 2.8 648.9 Net assets acquired $ 73.0 $ 11.3 $ 84.3 Consideration paid: Class A common stock $ 157.3 Total consideration paid $ 157.3 Goodwill $ 73.0 Explanation of fair value adjustments and the removal of previously recorded fair value marks recorded by IIBK: (1) Write up of the book value of investments to their estimated fair values on the date of acquisition based upon quotes obtained from an independent third party pricing service. (2) Write down of the book value of loans to their estimated fair values. The fair value of the loans was estimated using cash flow projections based on the remaining maturity and repricing terms, adjusted for estimated future credit losses and prepayments and discounted to present value using a risk-adjusted market rate for similar loans. The fair value of collateral dependent loans acquired with deteriorated credit quality was estimated based on the Company’s analysis of the fair value of each loan’s underlying collateral, discounted using market-derived rates of return with consideration given to the period of time and costs associated with foreclosure and disposition of the collateral. (3) Adjustment to remove the IIBK allowance for loan losses at acquisition date, as the credit risk is included in the fair value adjustment for loans receivable described in (2) above. (4) Write up of the book value of premises and equipment to their estimated fair values on the date of acquisition based upon broker’s opinion of value. (5) Adjustment to the book value of other real estate owned to their estimated fair values on the date of acquisition based on appraisal value. (6) Adjustment represents the value of the core deposit base assumed in the acquisition based upon valuation from an independent accounting and advisory firm. (7) Adjustment consists of the write-off of pre-existing deferred tax assets and purchase accounting adjustments as a result of the acquisition. (8) Adjustment consists of reductions to the fair value of other items. (9) Increase in book value of time deposits to their estimated fair values based upon interest rates of similar time deposits with similar terms on the date of acquisition based upon valuation from an independent accounting and advisory firm. (10) Adjustment to the liability for the nonqualified retirement plan. (11) Adjustment of the book value of debt to the estimated fair values on the date of acquisition based upon interest rates in the market.
Schedule of Acquired Loans with Credit Impairment	Information regarding IIBK loans acquired deemed credit impaired as of the April 8, 2019 acquisition date are as follows: Contractually required principal and interest payments $ 24.1 Contractual cash flows not expected to be collected (“non-accretable discount”) 3.9 Cash flows expected to be collected 20.2 Interest component of cash flows expected to be collected (“accretable discount”) 3.4 Fair value of acquired credit-impaired loans $ 16.8
Schedule of Acquired Loans not Deemed to Have Credit Impairment	Information regarding IIBK acquired loans not deemed credit-impaired at the April 8, 2019 acquisition date are as follows: Contractually required principal and interest payments $ 398.7 Contractual cash flows not expected to be collected 15.2 Fair value at acquisition $ 321.5
Summary of Pre-tax Merger Related Expenses

Goodwill and Core Deposit Int_2

Goodwill and Core Deposit Intangibles (Tables)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill		<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table presents a rollforward of goodwill from the beginning of the year to goodwill as of the dates indicated:</font></div><div style="line-height:120%;text-align:left;padding-left:36px;text-indent:0px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:94.54545454545455%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:74%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">March 31, <br clear="none"/>2020</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">December 31, <br clear="none"/>2019</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net carrying value at beginning of the period</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">621.6</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">546.7</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Additions to provisional goodwill from acquisitions</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">—</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">74.9</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net carrying value at end of period</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">621.6</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">621.6</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div></div>
Schedule of Core Deposit Intangibles		<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:justify;padding-left:36px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table presents Core deposit intangibles (“CDI”) as of the dates indicated:</font></div><div style="line-height:120%;text-align:left;padding-left:36px;text-indent:0px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:94.54545454545455%;border-collapse:collapse;text-align:left;"><tr><td colspan="9" rowspan="1"></td></tr><tr><td style="width:74%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:10%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">March 31, <br clear="none"/>2020</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">December 31, <br clear="none"/>2019</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Gross CDI, at beginning of the period</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">106.0</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">89.7</font></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Established through acquisitions or provisional adjustments</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">—</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">16.6</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Reductions due to sale of accounts</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">—</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(0.3</font></div></td><td style="vertical-align:bottom;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Accumulated amortization</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(46.9</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">(43.9</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Net CDI, end of period</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">59.1</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">62.1</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div></div>
Schedule of Future Amortization Expense	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;padding-left:36px;text-indent:0px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table provides the estimated future CDI amortization expense: </font><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:94.54545454545455%;border-collapse:collapse;text-align:left;"><tr><td colspan="6" rowspan="1"></td></tr><tr><td style="width:55%;" rowspan="1" colspan="1"></td><td style="width:18%;" rowspan="1" colspan="1"></td><td style="width:18%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td><td style="width:7%;" rowspan="1" colspan="1"></td><td style="width:1%;" rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Years Ending December 31,</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2019 remaining</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">8.1</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2020</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">9.9</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2021</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">9.0</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2022</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">8.2</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">2023</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">7.3</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Thereafter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;" rowspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">16.8</font></div></td><td style="vertical-align:bottom;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-left:12px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Total</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> </font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:right;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">59.3</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;border-top:1px solid #000000;" rowspan="1" colspan="1"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div></td></tr></table></div></div></div>

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2020
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 for the periods indicated: March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 17.1 $ — $ — $ 17.1 State, county and municipal securities 111.4 0.9 — 112.3 Obligations of U.S. government agencies 202.7 1.0 (0.1 ) 203.6 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 2,356.7 60.8 (2.7 ) 2,414.8 Private mortgage-backed securities 41.2 — (1.2 ) 40.0 Corporate securities 215.6 0.4 (5.5 ) 210.5 Other investments 2.0 — — 2.0 Total $ 2,946.7 $ 63.1 $ (9.5 ) $ 3,000.3 March 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 55.2 $ 2.3 $ — $ 57.5 Obligations of U.S. government agencies 9.8 — — 9.8 U.S agency residential mortgage-backed securities & collateralized mortgage obligations 1.2 0.1 — 1.3 Corporate securities 3.9 — — 3.9 Other investments 0.1 — — 0.1 Total $ 70.2 $ 2.4 $ — $ 72.6 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-Sale: U.S. Treasury notes $ 9.0 $ — $ — $ 9.0 State, county and municipal securities 80.1 0.8 — 80.9 Obligations of U.S. government agencies 367.5 0.1 (0.8 ) 366.8 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 2,303.6 19.6 (6.0 ) 2,317.2 Private mortgage-backed securities 47.6 — (0.4 ) 47.2 Corporate securities 134.5 1.2 — 135.7 Other investments 3.2 — — 3.2 Total $ 2,945.5 $ 21.7 $ (7.2 ) $ 2,960.0 December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Held-to-Maturity: State, county and municipal securities $ 57.3 $ 2.1 $ — $ 59.4 Obligations of U.S. government agencies 19.8 — — 19.8 U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 1.2 — — 1.2 Corporate securities 13.9 0.1 — 14.0 Other investments 0.1 — — 0.1 Total $ 92.3 $ 2.2 $ — $ 94.5
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, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position as of March 31, 2020 and December 31, 2019 . There was no material allowance for credit loss as of March 31, 2020 . Less than 12 Months 12 Months or More Total March 31, 2020 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: Obligations of U.S. government agencies $ 19.9 $ (0.1 ) $ — $ — $ 19.9 $ (0.1 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 143.5 (1.7 ) 133.6 (1.0 ) 277.1 (2.7 ) Private mortgage-backed securities — — 40.0 (1.2 ) 40.0 (1.2 ) Corporate securities 119.9 (4.9 ) 39.9 (0.6 ) 159.8 (5.5 ) Total $ 283.3 $ (6.7 ) $ 213.5 $ (2.8 ) $ 496.8 $ (9.5 ) Less than 12 Months 12 Months or More Total December 31, 2019 Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-Sale: Obligations of U.S. government agencies $ 185.3 $ (0.8 ) $ — $ — $ 185.3 $ (0.8 ) U.S. agency residential mortgage-backed securities & collateralized mortgage obligations 740.1 (4.6 ) 155.9 (1.4 ) 896.0 (6.0 ) Private mortgage-backed securities — — 46.6 (0.4 ) 46.6 (0.4 ) Total $ 925.4 $ (5.4 ) $ 202.5 $ (1.8 ) $ 1,127.9 $ (7.2 )
Maturities of Investment Securities	Maturities of investment securities at March 31, 2020 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates. Available-for-Sale Held-to-Maturity March 31, 2020 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Within one year $ 614.3 $ 608.0 $ 19.7 $ 19.8 After one year but within five years 1,416.2 1,422.1 27.4 27.8 After five years but within ten years 421.2 523.5 21.3 23.2 After ten years 495.0 446.7 1.8 1.8 Total $ 2,946.7 $ 3,000.3 $ 70.2 $ 72.6

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2020
Receivables [Abstract]
Schedule of Loans by Class	The following table presents loans by segment as of the dates indicated: March 31, December 31, Real estate loans: Commercial* $ 3,543.4 $ 3,487.8 Construction loans: Land acquisition & development 290.5 302.1 Residential 228.4 244.1 Commercial 459.4 431.5 Total construction loans 978.3 977.7 Residential* 1,231.0 1,246.1 Agricultural 224.6 226.6 Total real estate loans 5,977.3 5,938.2 Consumer loans: Indirect 774.6 784.6 Direct and advance lines 175.0 179.0 Credit card 75.9 81.6 Total consumer loans 1,025.5 1,045.2 Commercial* 1,660.0 1,673.7 Agricultural 257.9 279.1 Other, including overdrafts 3.7 — Net deferred loan fees and costs (6.4 ) (5.5 ) Loans held for investment 8,918.0 8,930.7 Mortgage loans held for sale 94.4 100.9 Total loans 9,012.4 9,031.6 Allowance for credit losses (129.1 ) (73.0 ) Total loans, net $ 8,883.3 $ 8,958.6 *In conjunction with the adoption of ASC 326, the Company reclassified certain 2019 amounts in our multi-family loan portfolio from residential real estate to commercial real estate. Additionally, we reclassified certain 2019 amounts in our commercial 1-4 family and commercial home equity lines of credit from commercial real estate to commercial to conform 2019 amounts to the March 31, 2020 presentation. These reclassifications did not change previously reported total loans.
Schedule of Allowance for Loan Losses by Portfolio Segment	The following table represents, by loan portfolio segment, the activity in the allowance for credit losses for loans held for investment: Three Months Ended March 31, 2020 Beginning Balance, Prior to Adoption of ASC 326 Impact of Adopting ASC 326 Provision for Credit Loss Expense Loans Charged-Off Recoveries Collected Ending Balance Allowance for credit losses (1) Real estate: Commercial real estate: Non-owner occupied $ 8.8 $ 4.9 $ 2.0 $ — $ — $ 15.7 Owner occupied 10.0 3.5 2.2 — — 15.7 Multi-family 0.7 6.9 0.5 — — 8.1 Total commercial real estate 19.5 15.3 4.7 — — 39.5 Construction: Land acquisition & development 1.9 (0.1 ) 0.1 (0.5 ) — 1.4 Residential construction 1.5 (0.9 ) 0.5 — — 1.1 Commercial construction 2.7 1.3 2.1 — — 6.1 Total construction 6.1 0.3 2.7 (0.5 ) — 8.6 Residential real estate: Residential 1-4 family 1.8 10.6 0.5 — — 12.9 Home equity and HELOC 1.0 0.5 (0.1 ) — — 1.4 Total residential real estate 2.8 11.1 0.4 — — 14.3 Agricultural real estate 0.5 1.8 0.3 — — 2.6 Total real estate 28.9 28.5 8.1 (0.5 ) — 65.0 Consumer: Indirect 4.5 8.8 3.9 (1.2 ) 0.7 16.7 Direct and advance lines 2.9 3.0 0.4 (1.0 ) 0.2 5.5 Credit card 2.5 0.3 0.4 (0.8 ) 0.2 2.6 Total consumer 9.9 12.1 4.7 (3.0 ) 1.1 24.8 Commercial: Commercial and floor plans 25.5 (5.1 ) 13.5 (0.8 ) 0.4 33.5 Commercial purpose secured by 1-4 family 5.9 (3.8 ) 2.4 (0.1 ) — 4.4 Credit card 1.2 (1.1 ) 0.4 (0.2 ) — 0.3 Total commercial 32.6 (10.0 ) 16.3 (1.1 ) 0.4 38.2 Agricultural: Agricultural 1.6 (0.6 ) 0.1 — — 1.1 Total agricultural 1.6 (0.6 ) 0.1 — — 1.1 Total allowance for credit losses $ 73.0 $ 30.0 $ 29.2 $ (4.6 ) $ 1.5 $ 129.1 (1) Amounts presented above are exclusive of the allowance for credit losses related to unfunded commitments which are included in “Note 11 - Financial Instruments with Off-Balance Sheet Risk” included in this report. The following table represents activity in the allowance for credit losses for loans held for investment under historical GAAP: Three Months Ended March 31, 2019 Beginning Balance Provision for Credit Loss Expense Loans Charged-Off Recoveries Collected Ending Balance Allowance for credit losses Real estate $ 31.0 $ (1.7 ) $ (2.1 ) $ 0.2 $ 27.4 Consumer 8.7 2.0 (3.0 ) 1.1 8.8 Commercial 31.3 3.6 (0.8 ) 0.4 34.5 Agricultural 2.0 (0.2 ) (0.1 ) — 1.7 Total allowance for credit losses $ 73.0 $ 3.7 $ (6.0 ) $ 1.7 $ 72.4
Schedule of Recorded Investment in Impaired Loans	The following tables present the amortized cost basis of collateral dependent loans by class of loans as of March 31, 2020. The comparable period is not presented as collateral dependent type loans did not exist under prior GAAP. Under historical guidance, the recorded investment of impaired loans and the related specific reserve was $64.7 million and $3.6 million , respectively, as of December 31, 2019 . Collateral Type As of March 31, 2020 Business Assets Real Property Other Total Real estate $ 0.3 $ 1.0 $ 0.1 $ 1.4 Commercial 3.5 0.5 0.4 4.4 Agricultural — 0.1 — 0.1 Total collateral-dependent $ 3.8 $ 1.6 $ 0.5 $ 5.9
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 included in the following table as greater than 90 days past due are still accruing interest. The following tables present the contractual aging of the Company’s recorded amortized cost basis in loans by portfolio as of the dates indicated. Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of March 31, 2020 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate Commercial $ 7.1 $ 1.2 $ 1.0 $ 9.3 $ 3,519.9 $ 14.2 $ 3,543.4 Construction: Land acquisition & development 2.2 0.3 0.4 2.9 286.9 0.7 290.5 Residential 3.0 — 0.7 3.7 224.3 0.4 228.4 Commercial 0.1 — — 0.1 458.8 0.5 459.4 Total construction loans 5.3 0.3 1.1 6.7 970.0 1.6 978.3 Residential 2.3 0.8 0.2 3.3 1,222.9 4.8 1,231.0 Agricultural 0.8 — 2.9 3.7 213.3 7.6 224.6 Total real estate loans 15.5 2.3 5.2 23.0 5,926.1 28.2 5,977.3 Consumer: Indirect consumer 7.3 2.2 0.5 10.0 762.6 2.0 774.6 Other consumer 1.3 0.5 0.1 1.9 172.5 0.6 175.0 Credit card 0.8 0.3 0.9 2.0 73.9 — 75.9 Total consumer loans 9.4 3.0 1.5 13.9 1,009.0 2.6 1,025.5 Commercial 12.6 6.6 4.3 23.5 1,619.5 17.0 1,660.0 Agricultural 2.9 0.8 1.0 4.7 249.9 3.3 257.9 Other, including overdrafts — — — — 3.7 — 3.7 Loans held for investment $ 40.4 $ 12.7 $ 12.0 $ 65.1 $ 8,808.2 $ 51.1 $ 8,924.4 Total Loans 30 - 59 60 - 89 > 90 30 or More Days Days Days Days Current Non-accrual Total As of December 31, 2019 Past Due Past Due Past Due Past Due Loans Loans (1) Loans Real estate Commercial $ 5.5 $ 1.1 $ 0.6 $ 7.2 $ 3,467.6 $ 13.0 $ 3,487.8 Construction: Land acquisition & development 0.7 0.8 0.3 1.8 298.9 1.4 302.1 Residential 1.5 0.8 — 2.3 241.8 — 244.1 Commercial — — — — 431.0 0.5 431.5 Total construction loans 2.2 1.6 0.3 4.1 971.7 1.9 977.7 Residential 3.8 1.4 1.1 6.3 1,235.2 4.6 1,246.1 Agricultural 0.8 0.5 — 1.3 220.1 5.2 226.6 Total real estate loans 12.3 4.6 2.0 18.9 5,894.6 24.7 5,938.2 Consumer: Indirect consumer 7.6 1.9 0.5 10.0 773.0 1.6 784.6 Other consumer 1.2 0.5 0.1 1.8 176.7 0.5 179.0 Credit card 0.8 0.5 0.8 2.1 79.5 — 81.6 Total consumer loans 9.6 2.9 1.4 13.9 1,029.2 2.1 1,045.2 Commercial 4.8 2.6 2.3 9.7 1,650.3 13.7 1,673.7 Agricultural 0.9 0.1 — 1.0 275.7 2.4 279.1 Other, including overdrafts — — — — — — — Loans held for investment $ 27.6 $ 10.2 $ 5.7 $ 43.5 $ 8,849.8 $ 42.9 $ 8,936.2 (1) As of March 31, 2020 and December 31, 2019 , none of our non-accrual loans were earning interest income. Additionally, no material interest income was recognized on non-accrual loans during the three months ended March 31, 2020 and 2019 , respectively. Accrued interest of $0.2 million and $0.6 million was reversed during the three months ended March 31, 2020 and 2019 , respectively.
Schedule of Acquired Loans with Credit Impairment	Information regarding IIBK loans acquired deemed credit impaired as of the April 8, 2019 acquisition date are as follows: Contractually required principal and interest payments $ 24.1 Contractual cash flows not expected to be collected (“non-accretable discount”) 3.9 Cash flows expected to be collected 20.2 Interest component of cash flows expected to be collected (“accretable discount”) 3.4 Fair value of acquired credit-impaired loans $ 16.8
Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator	The Company evaluates the credit quality and loan performance for the allowance for credit loan losses of the following segments based on the aforementioned risk scale. Based on the most recent analysis performed, the risk category of loans by segment is as follows: March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial real estate non-owner occupied: Pass $ 99.7 $ 349.3 $ 259.5 $ 133.6 $ 176.3 $ 446.4 $ 20.5 $ 1,485.3 Special mention 15.4 3.7 0.7 0.9 1.7 13.2 — 35.6 Substandard 0.2 2.9 0.5 1.3 1.1 15.0 — 21.0 Doubtful — — 0.2 — — 0.1 — 0.3 Total $ 115.3 $ 355.9 $ 260.9 $ 135.8 $ 179.1 $ 474.7 $ 20.5 $ 1,542.2 Commercial real estate owner occupied: Pass $ 100.5 $ 348.8 $ 283.6 $ 170.0 $ 194.2 $ 459.0 $ 17.6 $ 1,573.7 Special mention 2.1 1.7 9.8 4.7 14.0 17.4 0.5 50.2 Substandard 6.6 10.1 9.7 5.6 19.3 19.9 0.6 71.8 Doubtful 0.2 — 0.2 0.1 0.5 0.5 — 1.5 Total $ 109.4 $ 360.6 $ 303.3 $ 180.4 $ 228.0 $ 496.8 $ 18.7 $ 1,697.2 Land, acquisition and development: Pass $ 38.3 $ 93.6 $ 53.9 $ 38.9 $ 12.4 $ 42.1 $ 5.9 $ 285.1 Special mention — 0.4 0.1 1.0 — 1.5 0.3 3.3 Substandard 0.1 0.1 0.3 0.5 — 0.5 0.4 1.9 Doubtful — — — — — 0.2 — 0.2 Total $ 38.4 $ 94.1 $ 54.3 $ 40.4 $ 12.4 $ 44.3 $ 6.6 $ 290.5 Residential construction: Pass $ 22.5 $ 121.8 $ 27.5 $ 6.9 $ 0.3 $ 0.4 $ 47.2 $ 226.6 Special mention — — 0.2 — — — — 0.2 Substandard — — 1.2 — — — — 1.2 Doubtful — — 0.4 — — — — 0.4 Total $ 22.5 $ 121.8 $ 29.3 $ 6.9 $ 0.3 $ 0.4 $ 47.2 $ 228.4 Commercial construction: Pass $ 51.9 $ 222.3 $ 139.3 $ 24.4 $ 10.0 $ 0.6 $ 7.7 $ 456.2 Special mention — — 1.5 — — — 0.2 1.7 Substandard — 1.0 0.4 — — 0.1 — 1.5 Doubtful — — — — — — — — Total $ 51.9 $ 223.3 $ 141.2 $ 24.4 $ 10.0 $ 0.7 $ 7.9 $ 459.4 Agricultural real estate: Pass $ 11.1 $ 57.1 $ 35.2 $ 22.3 $ 16.1 $ 36.7 $ 7.8 $ 186.3 Special mention 0.6 2.2 1.0 1.4 0.1 5.0 0.6 10.9 Substandard — 10.5 4.5 1.1 3.6 5.8 1.9 27.4 Doubtful — — — — — — — — Total $ 11.7 $ 69.8 $ 40.7 $ 24.8 $ 19.8 $ 47.5 $ 10.3 $ 224.6 March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial and floor plans: Pass $ 116.6 $ 247.2 $ 186.4 $ 120.9 $ 58.9 $ 118.1 $ 329.4 $ 1,177.5 Special mention 4.3 3.6 5.2 2.6 4.5 0.6 7.4 28.2 Substandard 10.5 21.7 8.8 0.9 5.2 5.7 18.7 71.5 Doubtful 0.1 1.7 0.4 0.2 — 0.4 0.4 3.2 Total $ 131.5 $ 274.2 $ 200.8 $ 124.6 $ 68.6 $ 124.8 $ 355.9 $ 1,280.4 Commercial purpose secured by 1-4 family: Pass $ 22.9 $ 74.1 $ 49.2 $ 29.4 $ 19.6 $ 63.5 $ 25.7 $ 284.4 Special mention 0.3 2.5 0.8 0.8 0.5 1.2 0.7 6.8 Substandard 0.3 3.7 6.2 0.5 1.3 1.7 0.1 13.8 Doubtful — 0.1 0.1 — — 0.2 — 0.4 Total $ 23.5 $ 80.4 $ 56.3 $ 30.7 $ 21.4 $ 66.6 $ 26.5 $ 305.4 Agricultural: Pass $ 19.3 $ 40.9 $ 18.8 $ 7.4 $ 4.5 $ 1.8 $ 131.2 $ 223.9 Special mention 1.1 0.4 1.8 — 0.1 — 6.0 9.4 Substandard 5.4 2.0 5.1 1.4 0.3 0.5 8.2 22.9 Doubtful — — — — — — — — Total $ 25.8 $ 43.3 $ 25.7 $ 8.8 $ 4.9 $ 2.3 $ 145.4 $ 256.2 As of March 31, 2020 Consumer Commercial Agricultural Total Credit Card: Performing $ 75.7 $ 73.4 $ 1.7 $ 150.8 Nonperforming 0.9 0.8 — 1.7 Total $ 76.6 $ 74.2 $ 1.7 $ 152.5 The following presents the recorded investment in the Company’s loans by risk grades and loan class as of the date shown below: As of December 31, 2019 Pass Other Assets Especially Mentioned Substandard Doubtful Total Criticized Loans Total Loans Real estate: Commercial $ 3,305.0 $ 84.7 $ 97.3 $ 0.8 $ 182.8 $ 3,487.8 Construction: Land acquisition & development 295.4 3.8 1.9 1.0 6.7 302.1 Residential 241.0 0.9 2.2 — 3.1 244.1 Commercial 428.3 1.7 1.5 — 3.2 431.5 Total construction loans 964.7 6.4 5.6 1.0 13.0 977.7 Residential 1,235.4 2.6 7.8 0.3 10.7 1,246.1 Agricultural 185.7 14.3 26.6 — 40.9 226.6 Total real estate loans 5,690.8 108.0 137.3 2.1 247.4 5,938.2 Consumer: Indirect consumer 781.5 0.2 2.9 — 3.1 784.6 Direct consumer 177.7 0.4 0.8 0.1 1.3 179.0 Credit card 81.6 — — — — 81.6 Total consumer loans 1,040.8 0.6 3.7 0.1 4.4 1,045.2 Commercial 1,569.4 40.4 60.3 3.6 104.3 1,673.7 Agricultural 247.8 8.5 22.7 0.1 31.3 279.1 Total $ 8,548.8 $ 157.5 $ 224.0 $ 5.9 $ 387.4 $ 8,936.2 March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial multi-family: Performing $ 28.9 $ 78.5 $ 31.3 $ 32.4 $ 28.9 $ 102.9 $ 1.1 $ 304.0 Nonperforming — — — — — — — — Total $ 28.9 $ 78.5 $ 31.3 $ 32.4 $ 28.9 $ 102.9 $ 1.1 $ 304.0 Residential 1-4 family: Performing $ 33.8 $ 139.1 $ 103.1 $ 81.8 $ 96.5 $ 346.4 $ 0.2 $ 800.9 Nonperforming — 0.2 — — 0.6 1.2 — 2.0 Total $ 33.8 $ 139.3 $ 103.1 $ 81.8 $ 97.1 $ 347.6 $ 0.2 $ 802.9 Consumer home equity and HELOC: Performing $ 3.4 $ 12.4 $ 11.1 $ 14.6 $ 5.9 $ 22.0 $ 358.0 $ 427.4 Nonperforming — — 0.1 0.2 0.3 0.1 — 0.7 Total $ 3.4 $ 12.4 $ 11.2 $ 14.8 $ 6.2 $ 22.1 $ 358.0 $ 428.1 March 31, 2020 Term Loans Amortized Cost Basis by Origination Year Risk by Collateral 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Consumer indirect: Performing $ 70.3 $ 267.3 $ 174.5 $ 115.6 $ 79.4 $ 66.3 $ — $ 773.4 Nonperforming — 0.4 0.4 0.1 0.1 0.2 — 1.2 Total $ 70.3 $ 267.7 $ 174.9 $ 115.7 $ 79.5 $ 66.5 $ — $ 774.6 Consumer direct and advance line: Performing $ 13.6 $ 44.9 $ 46.6 $ 20.0 $ 9.4 $ 13.4 $ 26.7 $ 174.6 Nonperforming — 0.1 0.1 0.1 0.1 — — 0.4 Total $ 13.6 $ 45.0 $ 46.7 $ 20.1 $ 9.5 $ 13.4 $ 26.7 $ 175.0

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	3 Months Ended
	Mar. 31, 2020
Repossessed Assets [Abstract]
Other Real Estate Owned Roll Forward	Information with respect to the Company’s other real estate owned follows: Three Months Ended March 31, 2020 2019 Beginning balance $ 8.5 $ 14.4 Additions 0.9 8.4 Valuation adjustments — (0.3 ) Dispositions (1.2 ) (1.4 ) Ending balance $ 8.2 $ 21.1

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts and Estimated Fair Values of Derivatives	The notional amounts and estimated fair values of the Company’s derivatives are presented in the following table. Fair value estimates are obtained from third parties and are based on pricing models. March 31, 2020 December 31, 2019 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Derivative Assets (included in other assets on the consolidated balance sheets): Non-hedging interest rate derivatives: Interest rate swap contracts $ 536.0 $ 57.4 $ 503.2 $ 21.9 Interest rate lock commitments 361.2 7.7 67.8 1.3 Total derivative assets $ 897.2 $ 65.1 $ 571.0 $ 23.2 Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets): Non-hedging interest rate derivatives: Interest rate swap contracts $ 536.0 $ 57.4 $ 503.2 $ 21.9 Forward loan sales contracts 377.2 2.1 128.0 0.3 Total derivative liabilities $ 913.2 $ 59.5 $ 631.2 $ 22.2
Offsetting Assets and Liabilities	The following table illustrates the potential effect of the Company’s master netting arrangements, by type of financial instrument, on the Company’s consolidated balance sheets as of March 31, 2020 and December 31, 2019 : March 31, 2020 Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet Net Amounts in the Balance Sheet Financial Instruments Fair Value of Financial Collateral in the Balance Sheet Net Amount Financial Assets Interest rate swap contracts $ 57.4 $ — $ 57.4 $ — $ 35.1 $ 22.3 Mortgage related derivatives 7.7 — 7.7 — — 7.7 Total derivatives 65.1 — 65.1 — 35.1 30.0 Total assets $ 65.1 $ — $ 65.1 $ — $ 35.1 $ 30.0 Financial Liabilities Interest rate swap contracts $ 57.4 $ — $ 57.4 $ — $ — $ 57.4 Mortgage related derivatives 2.1 — 2.1 — — 2.1 Total derivatives 59.5 — 59.5 — — 59.5 Repurchase agreements 614.1 614.1 — 614.1 — Total liabilities $ 673.6 $ — $ 673.6 $ — $ 614.1 $ 59.5 December 31, 2019 Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet Net Amounts in the Balance Sheet Financial Instruments Fair Value of Financial Collateral in the Balance Sheet Net Amount Financial Assets Interest rate swap contracts $ 21.9 $ — $ 21.9 $ 0.1 $ 18.0 $ 3.8 Mortgage related derivatives 1.3 — 1.3 — — 1.3 Total derivatives 23.2 — 23.2 0.1 18.0 5.1 Total assets $ 23.2 $ — $ 23.2 $ 0.1 $ 18.0 $ 5.1 Financial Liabilities Interest rate swap contracts $ 21.9 $ — $ 21.9 $ 0.1 $ — $ 21.8 Mortgage related derivatives 0.3 — 0.3 — — 0.3 Total derivatives 22.2 — 22.2 0.1 — 22.1 Repurchase agreements 697.6 — 697.6 — 697.6 — Total liabilities $ 719.8 $ — $ 719.8 $ 0.1 $ 697.6 $ 22.1
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	The following table presents the pre-tax gains or losses related to derivative contracts that were recorded in other non-interest income in the Company’s statements of income for the periods indicated: Three Months Ended March 31, 2020 2019 Non-hedging interest rate derivatives: Amount of net fee income recognized in other non-interest income $ 1.0 $ 0.8 Amount of net gains recognized in mortgage banking revenues 4.5 0.4

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	3 Months Ended
	Mar. 31, 2020
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 three month period ended March 31, 2020 and 2019 : Three Months Ended March 31, 2020 2019 Net income $ 29.3 $ 41.6 Weighted average common shares outstanding for basic earnings per share computation 64,790,186 60,311,171 Dilutive effects of stock-based compensation 146,921 286,899 Weighted average common shares outstanding for diluted earnings per common share computation 64,937,107 60,598,070 Basic earnings per common share $ 0.45 $ 0.69 Diluted earnings per common share $ 0.45 $ 0.69 Anti-dilutive unvested time restricted stock 113,468 121,452

Regulatory Capital (Tables)

Regulatory Capital (Tables)	3 Months Ended
	Mar. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	Actual capital amounts and ratios for the Company and its subsidiary Bank, as of March 31, 2020 and December 31, 2019 are presented in the following tables: Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1) March 31, 2020 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 1,460.3 13.67 % $ 854.8 8.000 % $ 1,121.9 10.50 % $ 1,068.5 10.00 % FIB 1,339.7 12.58 852.3 8.000 1,118.6 10.50 1,065.3 10.00 Tier 1 risk-based capital: Consolidated 1,367.7 12.80 641.1 6.000 908.2 8.50 854.8 8.00 FIB 1,247.1 11.71 639.2 6.000 905.5 8.50 852.3 8.00 Common equity tier 1 risk-based capital: Consolidated 1,283.6 12.01 480.8 4.500 747.9 7.00 694.5 6.50 FIB 1,247.1 11.71 479.4 4.500 745.7 7.00 692.5 6.50 Leverage capital ratio: Consolidated 1,367.7 9.90 552.5 4.000 552.5 4.00 690.6 5.00 FIB 1,247.1 9.05 551.2 4.000 551.2 4.00 689.0 5.00 In connection with the adoption of ASC 326, we recognized an after-tax cumulative effect reduction to retained earnings totaling $24.1 million . In March 2020, the Office of the Comptroller of Currency, the Board of Governors of the Federal Reserve System, and the FDIC issued an interim final rule that allows banking organizations to mitigate the effects of ASC 326 on their regulatory capital computations. This interim rule is in addition to the three-year transition period already in place under the capital transition rule previously issued in February 2019. Banking organizations can elect to mitigate the estimated cumulative regulatory capital effects for an additional two years. This rule allows an institution to defer transitioning the impact of ASC 326 into its regulatory capital calculation, including ratios, over an extended period. Additionally, the interim rule extends the transition period whereby an institution can defer the impact from ASC 326 on the current period, determined based on the difference between the new ASC 326 allowance for credit losses and the allowance for loan losses under the incurred loss method from previous GAAP, for up to two years. The total impact related to ASC 326 would then be transitioned into regulatory capital and the associated ratios over a three-year transition period, beginning after the initial two-year deferral period, for a total transition period of five years. The Company has elected to opt into the transition election and is adopting transition relief over the permissible five-year period. Accordingly, a CECL transitional amount totaling $29.0 million has been added back to CET1. The CECL transitional amount includes $30.0 million related to the cumulative effect of adopting CECL and $6.5 million related to the estimated regulatory incremental effect of CECL during the three months ended March 31, 2020. Actual Minimum Required for Capital Adequacy Purposes For Capital Adequacy Purposes Plus Capital Conservation Buffer Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements(1) December 31, 2019 Amount Ratio Amount Ratio Amount Ratio Amount Ratio Total risk-based capital: Consolidated $ 1,495.3 14.10 % $ 848.5 8.00 % $ 1,113.6 10.50 % $ 1,060.6 10.00 % FIB 1,321.4 12.50 845.8 8.00 1,110.1 10.50 1,057.2 10.00 Tier 1 risk-based capital: Consolidated 1,422.3 13.41 636.3 6.00 901.5 8.50 848.5 8.00 FIB 1,248.4 11.81 634.3 6.00 898.6 8.50 845.8 8.00 Common equity tier 1 risk-based capital: Consolidated 1,338.2 12.62 477.3 4.50 742.4 7.00 689.4 6.50 FIB 1,248.4 11.81 475.7 4.50 740.0 7.00 687.2 6.50 Leverage capital ratio: Consolidated 1,422.3 10.13 561.6 4.00 561.6 4.00 702.0 5.00 FIB 1,248.4 8.91 560.4 4.00 560.4 4.00 700.4 5.00 (1) The ratios for 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.

Other Comprehensive Income_Lo_2

Other Comprehensive Income/Loss (Tables)	3 Months Ended
	Mar. 31, 2020
Equity [Abstract]
Schedule of Other Comprehensive Income and Related Tax Effects	The gross amounts of each component of other comprehensive income and the related tax effects are as follows: Pre-tax Tax Expense (Benefit) Net of Tax Three Months Ended March 31, 2020 2019 2020 2019 2020 2019 Investment securities available-for sale: Change in net unrealized gains during period $ 39.2 $ 33.6 $ 10.3 $ 8.8 $ 28.9 $ 24.8 Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale — (6.0 ) — (1.6 ) — (4.4 ) Defined benefits post-retirement benefit plan: Change in net actuarial gains (0.2 ) (0.2 ) (0.1 ) — (0.1 ) (0.2 ) Total other comprehensive income $ 39.0 $ 27.4 $ 10.2 $ 7.2 $ 28.8 $ 20.2
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive loss, net of related tax effects, are as follows: March 31, 2020 December 31, 2019 Net unrealized gains on investment securities available-for-sale $ 39.6 $ 10.6 Net actuarial gains on defined benefit post-retirement benefit plans 0.2 0.4 Net accumulated other comprehensive gains $ 39.8 $ 11.0

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis	Financial assets and liabilities measured at fair value on a recurring basis are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2020 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment debt securities available-for-sale: U.S. Treasury Notes $ 17.1 $ — $ 17.1 $ — State, county and municipal securities 112.3 — 112.3 — Obligations of U.S. government agencies 203.6 — 203.6 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 2,414.8 — 2,414.8 — Private mortgage-backed securities 40.0 — 40.0 — Corporate securities 210.5 — 210.5 — Other investments 2.0 — 2.0 — Loans held for sale 94.4 — 94.4 — Derivative assets: Interest rate swap contracts 57.4 — 57.4 — Interest rate lock commitments 7.7 — 7.7 — Derivative liabilities: Interest rate swap contracts 57.4 — 57.4 — Forward loan sale contracts 2.1 — 2.1 — Deferred compensation plan assets 17.3 — 17.3 — Deferred compensation plan liabilities 17.3 — 17.3 — Fair Value Measurements at Reporting Date Using As of December 31, 2019 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Investment debt securities available-for-sale: U.S. Treasury notes $ 9.0 $ — $ 9.0 $ — State, county and municipal securities 80.9 — 80.9 — Obligations of U.S. government agencies 366.8 — 366.8 — U.S. agencies mortgage-backed securities & collateralized mortgage obligations 2,317.2 — 2,317.2 — Private mortgage-backed securities 47.2 — 47.2 — Corporate securities 135.7 — 135.7 — Other investments 3.2 — 3.2 — Loans held for sale 100.9 — 100.9 — Derivative assets: Interest rate swap contracts 21.9 — 21.9 — Interest rate lock commitments 1.3 — 1.3 — Derivative liabilities Interest rate swap contracts 21.9 — 21.9 — Forward loan sales contracts 0.3 — 0.3 — Deferred compensation plan assets 18.2 — 18.2 — Deferred compensation plan liabilities 18.2 — 18.2 —
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis	The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis: Fair Value Measurements at Reporting Date Using As of March 31, 2020 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Collateral dependent loans* $ 3.6 $ — $ — $ 3.6 Other real estate owned 2.3 — — 2.3 Long-lived assets to be disposed of by sale 5.0 — — 5.0 Fair Value Measurements at Reporting Date Using As of December 31, 2019 Balance Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Impaired Loans* $ 27.3 $ — $ — $ 27.3 Other real estate owned 2.2 — — 2.2 Long-lived assets to be disposed of by sale 6.2 — — 6.2 *The Company adopted ASC 326 as of January 1, 2020 which changes the methodology of impaired loans. The comparable period presents impaired loans under previously applicable GAAP.
Fair Value Inputs, Assets, Quantitative Information	The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values: Fair Value As of March 31, 2020 December 31, 2019 Valuation Technique Unobservable Inputs Range (Weighted Average) Collateral dependent loans $ 3.6 $ 27.3 Appraisal Appraisal adjustment 0% - 56% (22%) Other real estate owned 2.3 2.2 Appraisal Appraisal adjustment 8% - 65% (27%) Long-lived assets to be disposed of by sale 5.0 6.2 Appraisal Appraisal adjustment 0% - 37% (3%)
Fair Value, by Balance Sheet Grouping	The estimated fair values of financial instruments that are reported in the Company’s consolidated balance sheets, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value, are as follows: Fair Value Measurements at Reporting Date Using As of March 31, 2020 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 869.2 $ 869.2 $ 869.2 $ — $ — Investment debt securities available-for-sale 3,000.3 3,000.3 — 3,000.3 — Investment debt securities held-to-maturity 70.2 72.6 — 72.6 — Accrued interest receivable 46.3 46.3 — 46.3 — Mortgage servicing rights, net 27.8 27.8 — 27.8 — Loans held for sale 94.4 94.4 — 94.4 — Net loans held for investment 8,788.9 8,856.5 — 8,852.9 3.6 Derivative assets 65.1 65.1 — 65.1 — Deferred compensation plan assets 17.3 17.3 — 17.3 — Total financial assets $ 12,979.5 $ 13,049.5 $ 869.2 $ 12,176.7 $ 3.6 Financial liabilities: Total deposits, excluding time deposits $ 10,244.5 $ 10,244.5 $ 10,244.5 $ — $ — Time deposits 1,320.6 1,324.9 — 1,324.9 — Securities sold under repurchase agreements 614.1 614.1 — 614.1 — Accrued interest payable 10.3 10.3 — 10.3 — Long-term debt 13.9 10.5 — 10.5 — Subordinated debentures held by subsidiary trusts 86.9 81.5 — 81.5 — Derivative liabilities 59.5 59.5 — 59.5 — Deferred compensation plan liabilities 17.3 17.3 — 17.3 — Total financial liabilities $ 12,367.1 $ 12,362.6 $ 10,244.5 $ 2,118.1 $ — Fair Value Measurements at Reporting Date Using As of December 31, 2019 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial assets: Cash and cash equivalents $ 1,076.8 $ 1,076.8 $ 1,076.8 $ — $ — Investment debt securities available-for-sale 2,960.0 2,960.0 — 2,960.0 — Investment debt securities held-to-maturity 92.3 94.5 — 94.5 — Accrued interest receivable 46.7 46.7 — 46.7 — Mortgage servicing rights, net 30.2 34.8 — 34.8 — Loans held for sale 100.9 100.9 — 100.9 — Net loans held for investment 8,857.7 8,930.7 — 8,906.7 24.0 Derivative assets 23.2 23.2 — 23.2 — Deferred compensation plan assets 18.2 18.2 — 18.2 — Total financial assets $ 13,206.0 $ 13,285.8 $ 1,076.8 $ 12,185.0 $ 24.0 Financial liabilities: Total deposits, excluding time deposits $ 10,213.5 $ 10,213.5 $ 10,213.5 $ — $ — Time deposits 1,450.0 1,446.6 — 1,446.6 — Securities sold under repurchase agreements 697.6 697.6 — 697.6 — Accrued interest payable 12.1 12.1 — 12.1 — Long-term debt 13.9 10.4 — 10.4 — Subordinated debentures held by subsidiary trusts 86.9 81.3 — 81.3 — Derivative liabilities 22.2 22.2 — 22.2 — Deferred compensation plan liabilities 18.2 18.2 — 18.2 — Total financial liabilities $ 12,514.4 $ 12,501.9 $ 10,213.5 $ 2,288.4 $ —

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Allowance for Credit Loss				$ 0
Proceeds from Interest Received	$ (0.4)	$ 1.6
Accrued Investment Income Receivable	9.6
Accounts Receivable, Allowance for Credit Loss	129.1	72.4	$ 29	73	$ 73
Off-balance sheet credit liability	2.1	0	0.2	0
Deferred tax liability, net	(24.4)			(26.7)
Retained Earnings (Accumulated Deficit)	$ 897.6			953.6
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			0
Accounts Receivable, Allowance for Credit Loss			103
Off-balance sheet credit liability			2.3
Deferred tax liability, net			(18.5)
Retained Earnings (Accumulated Deficit)			929.5
Cumulative Effect, Period of Adoption, Adjustment [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			0
Accounts Receivable, Allowance for Credit Loss			30	$ 30
Off-balance sheet credit liability		$ 0	2.3
Deferred tax liability, net			(8.2)
Retained Earnings (Accumulated Deficit)			$ (24.1)

Acquisitions - Narrative (Deta

Acquisitions - Narrative (Details) $ / shares in Units, $ in Millions	Apr. 08, 2019USD ($)officesegment$ / sharesshares	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill		$ 621.6		$ 621.6	$ 621.6	$ 621.6	$ 546.7
Acquisition related expenses		$ 0	$ 2.3
Core Deposits
Business Acquisition [Line Items]
Amortization of Intangible Assets	$ 3			$ 59.3	$ 59.1	$ 62.1
Estimated useful lives of related deposits	10 years			10 years
Community 1st Bank
Business Acquisition [Line Items]
Number of banking offices acquired | office	3
Total consideration exchanged	$ 18.8
Goodwill	2.3
Provisional net assets acquired	16.5
Provisional assets recorded	129.1
Provisional loans recorded	78.8
Acquired debt impaired	0.7
Provisional liabilities recorded	112.6
Provisional deposits recorded	$ 110.1
Community 1st Bank | Class A Common Stock
Business Acquisition [Line Items]
Number of shares issued in connection with Cascade merger (in shares) | shares	463,134
Price per share of First Interstate Class A common stock (in dollars per share) | $ / shares	$ 40.64
Business acquisition conversion share rate (in shares) | shares	0.3784
Idaho Independent Bank
Business Acquisition [Line Items]
Number of banking offices acquired | office	11
Total consideration exchanged	$ 157.3
Goodwill	$ 73
Number of operating segments | segment	1
Core deposit intangible assets	$ 13.6
Idaho Independent Bank | Class A Common Stock
Business Acquisition [Line Items]
Number of shares issued in connection with Cascade merger (in shares) | shares	3,871,422
Price per share of First Interstate Class A common stock (in dollars per share) | $ / shares	$ 40.64
Business acquisition conversion share rate (in shares) | shares	0.50
Idaho Independent Bank | Core Deposits
Business Acquisition [Line Items]
Estimated useful lives of related deposits	10 years

Acquisitions - Schedule of Rec

Acquisitions - Schedule of Recognized Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Apr. 08, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liabilities assumed:
Goodwill		$ 621.6	$ 621.6	$ 621.6	$ 621.6	$ 546.7
Idaho Independent Bank, As Recorded By Idaho Independent Bank
Assets acquired:
Mortgage loans held for sale	$ 0.5
Allowance for loan loss	(6.3)
Premises and equipment	16.5
Other real estate owned (“OREO”)	0.4
Company owned life insurance	15.2
Core deposit intangible assets	0
Deferred tax assets, net	3.2
Other assets	8.6
Total assets acquired	719.1
Liabilities assumed:
Deposits	596.5
Accounts payable and accrued expense	15.2
Other borrowed funds	4
Securities sold under repurchase agreements	30.4
Total liabilities assumed	646.1
Net assets acquired	73
Idaho Independent Bank, Fair Value Adjustments
Assets acquired:
Cash and cash equivalents	0
Investment securities	0.5
Loans held for investment	(9.8)
Mortgage loans held for sale	0
Allowance for loan loss	6.3
Premises and equipment	4.8
Other real estate owned (“OREO”)	2
Company owned life insurance	0
Core deposit intangible assets	13.6
Deferred tax assets, net	(2.6)
Other assets	(0.7)
Total assets acquired	14.1
Liabilities assumed:
Deposits	0.1
Accounts payable and accrued expense	2.6
Other borrowed funds	0.1
Securities sold under repurchase agreements	0
Total liabilities assumed	2.8
Net assets acquired	11.3
Idaho Independent Bank
Assets acquired:
Cash and cash equivalents	270.7
Investment securities	63.2
Loans held for investment	337.8
Mortgage loans held for sale	0.5
Allowance for loan loss	0
Premises and equipment	21.3
Other real estate owned (“OREO”)	2.4
Company owned life insurance	15.2
Core deposit intangible assets	13.6
Deferred tax assets, net	0.6
Other assets	7.9
Total assets acquired	733.2
Liabilities assumed:
Deposits	596.6
Accounts payable and accrued expense	17.8
Other borrowed funds	4.1
Securities sold under repurchase agreements	30.4
Total liabilities assumed	648.9
Net assets acquired	84.3
Class A common stock	157.3
Total consideration paid	157.3
Goodwill	73
Northwest Bank Acquisition, As Recorded By Inland Northwest Bank
Assets acquired:
Cash and cash equivalents	270.7
Investment securities	62.7
Loans held for investment	$ 347.6

Acquisitions - Schedule of Acq

Acquisitions - Schedule of Acquired loans with Credit Impairment (Details) - Idaho Independent Bank $ in Millions	Apr. 08, 2019USD ($)
Business Acquisition [Line Items]
Contractually required principal and interest payments	$ 24.1
Contractual cash flows not expected to be collected (“non-accretable discount”)	3.9
Cash flows expected to be collected	20.2
Interest component of cash flows expected to be collected (“accretable discount”)	3.4
Fair value of acquired credit-impaired loans	$ 16.8

Acquisitions - Schedule of A_2

Acquisitions - Schedule of Acquired Loans not Deemed to Have Credit Impairment (Details) - Idaho Independent Bank $ in Millions	Apr. 08, 2019USD ($)
Business Acquisition [Line Items]
Contractually required principal and interest payments	$ 398.7
Contractual cash flows not expected to be collected	15.2
Fair value at acquisition	$ 321.5

Acquisitions - Summary of Pre-

Acquisitions - Summary of Pre-tax Merger Related Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Combinations [Abstract]
Acquisition related expenses	$ 0	$ 2.3

Goodwill and Core Deposit Int_3

Goodwill and Core Deposit Intangibles - Narrative (Details) - USD ($)	Jul. 01, 2019	Apr. 08, 2019	Jul. 01, 2017	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0		$ 0
Goodwill [Line Items]
Amortization of intangible assets				$ 2,900,000		$ 2,300,000
Core Deposits
Goodwill [Line Items]
Amortization of intangible assets					$ 2,900,000		$ 2,300,000	$ 2,300,000	$ 2,900,000
Weighted average useful lives of related deposits		10 years							10 years

Goodwill and Core Deposit Int_4

Goodwill and Core Deposit Intangibles - Goodwill Carrying Value (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Net carrying value at beginning of the period	$ 621.6	$ 546.7
Additions to provisional goodwill from acquisitions	0	74.9
Net carrying value at end of period	$ 621.6	$ 621.6

Goodwill and Core Deposit Int_5

Goodwill and Core Deposit Intangibles - Schedule of Finite-Lived Intangible Assets (Details) - Core Deposits - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Apr. 08, 2019	Dec. 31, 2018	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Expected Amortization, Year One			$ 8.1
Finite-lived Intangible Assets [Roll Forward]
Gross CDI, at beginning of the period		$ 106				$ 89.7
Established through acquisitions or provisional adjustments	$ 0	16.6
Reductions due to sale of accounts	0	(0.3)
Accumulated amortization			(46.9)		$ (43.9)
Net CDI, end of period	$ 59.1	$ 62.1	$ 59.3	$ 3

Goodwill and Core Deposit Int_6

Goodwill and Core Deposit Intangibles - Schedule of Future Amortization Expense (Details) - Core Deposits - USD ($) $ in Millions	Dec. 31, 2019	Apr. 08, 2019	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
2020	$ 9.9
2021	9
2022	8.2
2023	7.3
Thereafter	16.8
Total	$ 59.3	$ 3	$ 59.1	$ 62.1

Investment Securities - Amorti

Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Available-for-Sale:
Amortized Cost	$ 2,946.7	$ 2,945.5
Gross Unrealized Gains	63.1	21.7
Gross Unrealized Losses	(9.5)	(7.2)
Estimated Fair Value	3,000.3	2,960
Held-to-Maturity:
Amortized Cost	70.2	92.3
Gross Unrealized Gains	2.4	2.2
Gross Unrealized Losses	0	0
Estimated Fair Value	72.6	94.5
U.S. Treasury Notes
Available-for-Sale:
Amortized Cost	17.1	9
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	17.1	9
State, county and municipal securities
Available-for-Sale:
Amortized Cost	111.4	80.1
Gross Unrealized Gains	0.9	0.8
Gross Unrealized Losses	0	0
Estimated Fair Value	112.3	80.9
Held-to-Maturity:
Amortized Cost	55.2	57.3
Gross Unrealized Gains	2.3	2.1
Gross Unrealized Losses	0	0
Estimated Fair Value	57.5	59.4
Obligations of U.S. government agencies
Available-for-Sale:
Amortized Cost	202.7	367.5
Gross Unrealized Gains	1	0.1
Gross Unrealized Losses	(0.1)	(0.8)
Estimated Fair Value	203.6	366.8
Held-to-Maturity:
Amortized Cost	9.8	19.8
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	9.8	19.8
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Amortized Cost	2,356.7	2,303.6
Gross Unrealized Gains	60.8	19.6
Gross Unrealized Losses	(2.7)	(6)
Estimated Fair Value	2,414.8	2,317.2
Held-to-Maturity:
Amortized Cost	1.2	1.2
Gross Unrealized Gains	0.1	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1.3	1.2
Private mortgage-backed securities
Available-for-Sale:
Amortized Cost	41.2	47.6
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1.2)	(0.4)
Estimated Fair Value	40	47.2
Corporate securities
Available-for-Sale:
Amortized Cost	215.6	134.5
Gross Unrealized Gains	0.4	1.2
Gross Unrealized Losses	(5.5)	0
Estimated Fair Value	210.5	135.7
Held-to-Maturity:
Amortized Cost	3.9	13.9
Gross Unrealized Gains	0	0.1
Gross Unrealized Losses	0	0
Estimated Fair Value	3.9	14
Other investments
Available-for-Sale:
Amortized Cost	2	3.2
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2	3.2
Other Investments
Held-to-Maturity:
Amortized Cost	0.1	0.1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 0.1	$ 0.1

Investment Securities - Narrat

Investment Securities - Narrative (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)Investments	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2019USD ($)Investments
Schedule of Held-to-maturity Securities [Line Items]
Investment securities classified as held to maturity	$ 70,200,000			$ 92,300,000
Investment securities in an unrealized loss position (securities) | Investments	239			331
Impairment loss	$ 0	$ 0	$ 0	$ 0
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	128,700,000
Fair value of investment securities callable after one year but within five years	129,200,000
Callable structured notes amortized costs	$ 0

Investment Securities - Gross

Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Available-for-Sale:
Available-for-Sale, Less than 12 Months, Fair Value	$ 283.3	$ 925.4
Available-for-sale, Less than 12 Months, Gross Unrealized Losses	(6.7)	(5.4)
Available-for-Sale, 12 Months or More, Fair Value	213.5	202.5
Available-for-Sale, 12 Months or More, Gross Unrealized Losses	(2.8)	(1.8)
Available-for-Sale, Total Fair Value	496.8	1,127.9
Available-for-Sale, Total Gross Unrealized Losses	(9.5)	(7.2)
Obligations of U.S. government agencies
Available-for-Sale:
Available-for-Sale, Less than 12 Months, Fair Value	19.9	185.3
Available-for-sale, Less than 12 Months, Gross Unrealized Losses	(0.1)	(0.8)
Available-for-Sale, 12 Months or More, Fair Value	0	0
Available-for-Sale, 12 Months or More, Gross Unrealized Losses	0	0
Available-for-Sale, Total Fair Value	19.9	185.3
Available-for-Sale, Total Gross Unrealized Losses	(0.1)	(0.8)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Available-for-Sale:
Available-for-Sale, Less than 12 Months, Fair Value	143.5	740.1
Available-for-sale, Less than 12 Months, Gross Unrealized Losses	(1.7)	(4.6)
Available-for-Sale, 12 Months or More, Fair Value	133.6	155.9
Available-for-Sale, 12 Months or More, Gross Unrealized Losses	(1)	(1.4)
Available-for-Sale, Total Fair Value	277.1	896
Available-for-Sale, Total Gross Unrealized Losses	(2.7)	(6)
Private mortgage-backed securities
Available-for-Sale:
Available-for-Sale, Less than 12 Months, Fair Value	0	0
Available-for-sale, Less than 12 Months, Gross Unrealized Losses	0	0
Available-for-Sale, 12 Months or More, Fair Value	40	46.6
Available-for-Sale, 12 Months or More, Gross Unrealized Losses	(1.2)	(0.4)
Available-for-Sale, Total Fair Value	40	46.6
Available-for-Sale, Total Gross Unrealized Losses	(1.2)	$ (0.4)
Corporate securities
Available-for-Sale:
Available-for-Sale, Less than 12 Months, Fair Value	119.9
Available-for-sale, Less than 12 Months, Gross Unrealized Losses	(4.9)
Available-for-Sale, 12 Months or More, Fair Value	39.9
Available-for-Sale, 12 Months or More, Gross Unrealized Losses	(0.6)
Available-for-Sale, Total Fair Value	159.8
Available-for-Sale, Total Gross Unrealized Losses	$ (5.5)

Investment Securities - Maturi

Investment Securities - Maturities of Investment Securities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Available-for-Sale, Amortized Cost
Available-for-Sale Amortized Cost, Within One Year	$ 614.3
Available-for-Sale Amortized Cost, After One Year but Within Five Years	1,416.2
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years	421.2
Available-for-Sale Amortized Cost, After Ten Years	495
Amortized Cost	2,946.7	$ 2,945.5
Available-for-Sale, Estimated Fair Value
Available-for-Sale Estimated Fair Value, Within One Year	608
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years	1,422.1
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years	523.5
Available-for-Sale Estimated Fair Value, After Ten Years	446.7
Available-for-Sale, Estimated Fair Value	3,000.3	2,960
Held-to-Maturity, Amortized Cost
Held-to-Maturity Amortized Cost, Within One Year	19.7
Held-to-Maturity Amortized Cost, After One Year but Within Five Years	27.4
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years	21.3
Held-to-Maturity Amortized Cost, After Ten Years	1.8
Amortized Cost	70.2	92.3
Held-to-Maturity, Estimated Fair Value
Held-to-Maturity Estimated Fair Value, Within One Year	19.8
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years	27.8
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years	23.2
Held-to-Maturity Estimated Fair Value, After Ten Years	1.8
Held-to-Maturity, Estimated Fair Value	$ 72.6	$ 94.5

Loans - Schedule of Loans by Se

Loans - Schedule of Loans by Segment (Details) - USD ($)	Mar. 31, 2020	Mar. 27, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Net deferred loan fees and costs	$ (6,400,000)			$ (5,500,000)
Loans held for investment	8,918,000,000			8,930,700,000
Mortgage loans held for sale	94,400,000			100,900,000
Total loans, net of deferred fees and costs	9,012,400,000	$ 1,000,000,000		9,031,600,000
Allowance for credit losses	(129,100,000)		$ (29,000,000)	(73,000,000)	$ (72,400,000)	$ (73,000,000)
Net loans	8,883,300,000			8,958,600,000
Commercial real estate
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	3,543,400,000			3,487,800,000
Allowance for credit losses	(39,500,000)			(19,500,000)
Land acquisition & development
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	290,500,000			302,100,000
Total loans, net of deferred fees and costs	290.5
Allowance for credit losses	(1,400,000)			(1,900,000)
Residential
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	228,400,000			244,100,000
Total loans, net of deferred fees and costs	228.4
Allowance for credit losses	(1,100,000)			(1,500,000)
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	459,400,000			431,500,000
Total loans, net of deferred fees and costs	459.4
Allowance for credit losses	(6,100,000)			(2,700,000)
Total construction loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	978,300,000			977,700,000
Residential
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	1,231,000,000			1,246,100,000
Allowance for credit losses	(14,300,000)			(2,800,000)
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	224,600,000			226,600,000
Total loans, net of deferred fees and costs	224.6
Allowance for credit losses	(2,600,000)			(500,000)
Total real estate loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	5,977,300,000			5,938,200,000
Allowance for credit losses	(65,000,000)			(28,900,000)
Indirect consumer
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	774,600,000			784,600,000
Total loans, net of deferred fees and costs	774.6
Allowance for credit losses	(16,700,000)			(4,500,000)
Direct and advance lines
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	175,000,000			179,000,000
Total loans, net of deferred fees and costs	175
Allowance for credit losses	(5,500,000)			(2,900,000)
Credit card
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	75,900,000			81,600,000
Allowance for credit losses	(2,600,000)			(2,500,000)
Total consumer loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	1,025,500,000			1,045,200,000
Allowance for credit losses	(24,800,000)			(9,900,000)
Commercial
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	1,660,000,000			1,673,700,000
Allowance for credit losses	(38,200,000)			(32,600,000)
Agricultural
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	257,900,000			279,100,000
Allowance for credit losses	(1,100,000)			(1,600,000)
Other, including overdrafts
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Loans held for investment	3,700,000			0
Mortgage loans originated for sale
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Mortgage loans held for sale	94,400,000			100,900,000
Total loans
Loans and Leases Receivable Recorded Investment, Past Due [Line Items]
Total loans, net of deferred fees and costs	$ 9,012,400,000			$ 9,031,600,000

Loans - Schedule of Allowance f

Loans - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 73	$ 73
Provision for Credit Loss Expense	29.2
Loans Charged-Off	(4.6)	(6)
Recoveries Collected	1.5
Ending balance	129.1	$ 72.4
Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8.8
Provision for Credit Loss Expense	2
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	15.7
Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10
Provision for Credit Loss Expense	2.2
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	15.7
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.7
Provision for Credit Loss Expense	0.5
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	8.1
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	19.5
Provision for Credit Loss Expense	4.7
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	39.5
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.6
Provision for Credit Loss Expense	0.1
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	1.1
Commercial and floor plans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	25.5
Provision for Credit Loss Expense	13.5
Loans Charged-Off	(0.8)
Recoveries Collected	0.4
Ending balance	33.5
Commercial purpose secured by 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5.9
Provision for Credit Loss Expense	2.4
Loans Charged-Off	(0.1)
Recoveries Collected	0
Ending balance	4.4
Land acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.9
Provision for Credit Loss Expense	0.1
Loans Charged-Off	(0.5)
Recoveries Collected	0
Ending balance	1.4
Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.5
Provision for Credit Loss Expense	0.5
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	1.1
Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.7
Provision for Credit Loss Expense	2.1
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	6.1
Total construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6.1
Provision for Credit Loss Expense	2.7
Loans Charged-Off	(0.5)
Recoveries Collected	0
Ending balance	8.6
Residential 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.8
Provision for Credit Loss Expense	0.5
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	12.9
Home equity and HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1
Provision for Credit Loss Expense	0.1
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	1.4
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.8
Provision for Credit Loss Expense	0.4
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	14.3
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.5
Provision for Credit Loss Expense	0.3
Loans Charged-Off	0
Recoveries Collected	0
Ending balance	2.6
Total real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28.9
Provision for Credit Loss Expense	8.1
Loans Charged-Off	(0.5)
Recoveries Collected	0
Ending balance	65
Indirect consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4.5
Provision for Credit Loss Expense	3.9
Loans Charged-Off	(1.2)
Recoveries Collected	0.7
Ending balance	16.7
Direct and advance lines
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.9
Provision for Credit Loss Expense	0.4
Loans Charged-Off	(1)
Recoveries Collected	0.2
Ending balance	5.5
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2.5
Provision for Credit Loss Expense	0.4
Loans Charged-Off	(0.8)
Recoveries Collected	0.2
Ending balance	2.6
Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	9.9
Provision for Credit Loss Expense	4.7
Loans Charged-Off	(3)
Recoveries Collected	1.1
Ending balance	24.8
Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.2
Provision for Credit Loss Expense	0.4
Loans Charged-Off	(0.2)
Recoveries Collected	0
Ending balance	0.3
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	32.6
Provision for Credit Loss Expense	16.3
Loans Charged-Off	(1.1)
Recoveries Collected	0.4
Ending balance	38.2
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30
Cumulative Effect, Period of Adoption, Adjustment [Member] | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4.9
Cumulative Effect, Period of Adoption, Adjustment [Member] | Owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3.5
Cumulative Effect, Period of Adoption, Adjustment [Member] | Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6.9
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	15.3
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(0.6)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial and floor plans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(5.1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial purpose secured by 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(3.8)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Land acquisition & development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(0.1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(0.9)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.3
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.3
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential 1-4 family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10.6
Cumulative Effect, Period of Adoption, Adjustment [Member] | Home equity and HELOC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.5
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11.1
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1.8
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total real estate loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28.5
Cumulative Effect, Period of Adoption, Adjustment [Member] | Indirect consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8.8
Cumulative Effect, Period of Adoption, Adjustment [Member] | Direct and advance lines
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3
Cumulative Effect, Period of Adoption, Adjustment [Member] | Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0.3
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total consumer loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12.1
Cumulative Effect, Period of Adoption, Adjustment [Member] | Credit card
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(1.1)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ (10)

Loans - Schedule of Allowance_2

Loans - Schedule of Allowance for Credit Losses for Loans Held for Investment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 73	$ 73
Provision for Credit Loss Expense	29	3.7
Loans Charged-Off	(4.6)	(6)
Recoveries Collected		1.7
Ending balance	$ 129.1	72.4
Real Estate
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		31
Provision for Credit Loss Expense		1.7
Loans Charged-Off		(2.1)
Recoveries Collected		0.2
Ending balance		27.4
Total consumer loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		8.7
Provision for Credit Loss Expense		2
Loans Charged-Off		(3)
Recoveries Collected		1.1
Ending balance		8.8
Commercial
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		31.3
Provision for Credit Loss Expense		3.6
Loans Charged-Off		(0.8)
Recoveries Collected		0.4
Ending balance		34.5
Agricultural
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2
Provision for Credit Loss Expense		0.2
Loans Charged-Off		(0.1)
Recoveries Collected		0
Ending balance		$ 1.7

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2019
Receivables [Abstract]
Impaired Financing Receivable, Interest Income, Accrual Method	$ 0
Impaired Financing Receivable, Recorded Investment	75,700,000			$ 64,700,000
Impaired Financing Receivable, Related Allowance				3,600,000
Loans renegotiated in troubled debt restructurings	22,400,000			24,900,000
Troubled restructurings included in non-accrual loans	17,400,000			19,400,000
Loans renegotiated in troubled debt restructurings, accrual loans	5,000,000			5,500,000
Troubled debt restructurings	0
Charge-offs directly related to modifying troubled debt restructurings	0	$ 0	$ 0	0
Balance of defaulted loans under trouble debt restructurings	0			0
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend				$ 0
Loans and Leases Receivable, Commitments to Purchase or Sell	0
Proceeds from Sale of Loans Held-for-investment	$ 0

Loans - Schedule of Recorded In

Loans - Schedule of Recorded Investment in Impaired Loans (Details) $ in Millions	Mar. 31, 2020USD ($)
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	$ 5.9
Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	1.4
Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	4.4
Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.1
Business Assets Pledged as Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	3.8
Business Assets Pledged as Collateral [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.3
Business Assets Pledged as Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	3.5
Business Assets Pledged as Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0
Real Property Pledged as Collateral [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	1.6
Real Property Pledged as Collateral [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	1
Real Property Pledged as Collateral [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.5
Real Property Pledged as Collateral [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.1
Other Property [Member]
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.5
Other Property [Member] | Total real estate loans
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.1
Other Property [Member] | Commercial
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	0.4
Other Property [Member] | Agricultural
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]
Collateral dependent borrowings	$ 0

Loans - Schedule of Contractual

Loans - Schedule of Contractual Aging of Loans by Portfolio (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	$ 8,918		$ 8,930.7
Accrued interest reversal	0.2	$ 0.6
Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2		2.1
Current Loans	73.9		79.5
Nonaccrual Loans	0		0
Total Loans	75.9		81.6
Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	9.3		7.2
Current Loans	3,519.9		3,467.6
Nonaccrual Loans	14.2		13
Total Loans	3,543.4		3,487.8
Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	10		10
Current Loans	762.6		773
Nonaccrual Loans	2		1.6
Total Loans	774.6		784.6
Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1.9		1.8
Current Loans	172.5		176.7
Nonaccrual Loans	0.6		0.5
Total Loans	175		179
Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.9		1.8
Current Loans	286.9		298.9
Nonaccrual Loans	0.7		1.4
Total Loans	290.5		302.1
Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	3.7		2.3
Current Loans	224.3		241.8
Nonaccrual Loans	0.4		0
Total Loans	228.4		244.1
Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.1		0
Current Loans	458.8		431
Nonaccrual Loans	0.5		0.5
Total Loans	459.4		431.5
Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	6.7		4.1
Current Loans	970		971.7
Nonaccrual Loans	1.6		1.9
Total Loans	978.3		977.7
Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	3.3		6.3
Current Loans	1,222.9		1,235.2
Nonaccrual Loans	4.8		4.6
Total Loans	1,231		1,246.1
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	3.7		1.3
Current Loans	213.3		220.1
Nonaccrual Loans	7.6		5.2
Total Loans	224.6		226.6
Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	23		18.9
Current Loans	5,926.1		5,894.6
Nonaccrual Loans	28.2		24.7
Total Loans	5,977.3		5,938.2
Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	13.9		13.9
Current Loans	1,009		1,029.2
Nonaccrual Loans	2.6		2.1
Total Loans	1,025.5		1,045.2
Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	23.5		9.7
Current Loans	1,619.5		1,650.3
Nonaccrual Loans	17		13.7
Total Loans	1,660		1,673.7
Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	4.7		1
Current Loans	249.9		275.7
Nonaccrual Loans	3.3		2.4
Total Loans	257.9		279.1
Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0
Current Loans	3.7		0
Nonaccrual Loans	0		0
Total Loans	3.7		0
Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	65.1		43.5
Current Loans	8,808.2		8,849.8
Nonaccrual Loans	51.1		42.9
Total Loans	8,924.4		8,936.2
30 to 59 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.8		0.8
30 to 59 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	7.1		5.5
30 to 59 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	7.3		7.6
30 to 59 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1.3		1.2
30 to 59 Days Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.2		0.7
30 to 59 Days Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	3		1.5
30 to 59 Days Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.1		0
30 to 59 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	5.3		2.2
30 to 59 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.3		3.8
30 to 59 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.8		0.8
30 to 59 Days Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	15.5		12.3
30 to 59 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	9.4		9.6
30 to 59 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	12.6		4.8
30 to 59 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.9		0.9
30 to 59 Days Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0
30 to 59 Days Past Due | Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	40.4		27.6
60 to 89 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.3		0.5
60 to 89 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1.2		1.1
60 to 89 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.2		1.9
60 to 89 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.5		0.5
60 to 89 Days Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.3		0.8
60 to 89 Days Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0.8
60 to 89 Days Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0
60 to 89 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.3		1.6
60 to 89 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.8		1.4
60 to 89 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0.5
60 to 89 Days Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.3		4.6
60 to 89 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	3		2.9
60 to 89 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	6.6		2.6
60 to 89 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.8		0.1
60 to 89 Days Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0
60 to 89 Days Past Due | Loans And Leases Held For Investment [Member]
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	12.7		10.2
Equal to or Greater than 90 Days Past Due | Credit card
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.9		0.8
Equal to or Greater than 90 Days Past Due | Commercial real estate
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1		0.6
Equal to or Greater than 90 Days Past Due | Indirect consumer
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.5		0.5
Equal to or Greater than 90 Days Past Due | Direct and advance lines
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.1		0.1
Equal to or Greater than 90 Days Past Due | Land acquisition & development
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.4		0.3
Equal to or Greater than 90 Days Past Due | Residential construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.7		0
Equal to or Greater than 90 Days Past Due | Commercial construction
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0		0
Equal to or Greater than 90 Days Past Due | Total construction loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1.1		0.3
Equal to or Greater than 90 Days Past Due | Residential
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	0.2		1.1
Equal to or Greater than 90 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	2.9		0
Equal to or Greater than 90 Days Past Due | Total real estate loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	5.2		2
Equal to or Greater than 90 Days Past Due | Total consumer loans
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1.5		1.4
Equal to or Greater than 90 Days Past Due | Commercial
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	4.3		2.3
Equal to or Greater than 90 Days Past Due | Agricultural
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	1		0
Equal to or Greater than 90 Days Past Due | Other, including overdrafts
Loans and Leases Receivable, Troubled Debt Restructuring [Line Items]
Past Due	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]
Past Due	$ 12		$ 5.7

Loans - Schedule of Recorded _2

Loans - Schedule of Recorded Investment in Criticized Loans by Class and Credit Quality Indicator (Details) - USD ($)	Mar. 31, 2020	Mar. 27, 2020	Dec. 31, 2019
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Total loans, net of deferred fees and costs	$ 9,012,400,000	$ 1,000,000,000	$ 9,031,600,000
Loans and Leases Receivable, Net of Deferred Income			8,936,200,000
Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	115.3
2019	355.9
2018	260.9
2017	135.8
2016	179.1
Prior	474.7
Revolving Loans Amortized Cost Basis	20.5
Total loans, net of deferred fees and costs	1,542.2
Commercial Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,487,800,000
Land acquisition & development
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	38.4
2019	94.1
2018	54.3
2017	40.4
2016	12.4
Prior	44.3
Revolving Loans Amortized Cost Basis	6.6
Total loans, net of deferred fees and costs	290.5
Loans and Leases Receivable, Net of Deferred Income			302,100,000
Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	22.5
2019	121.8
2018	29.3
2017	6.9
2016	0.3
Prior	0.4
Revolving Loans Amortized Cost Basis	47.2
Total loans, net of deferred fees and costs	228.4
Loans and Leases Receivable, Net of Deferred Income			244,100,000
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	51.9
2019	223.3
2018	141.2
2017	24.4
2016	10
Prior	0.7
Revolving Loans Amortized Cost Basis	7.9
Total loans, net of deferred fees and costs	459.4
Loans and Leases Receivable, Net of Deferred Income			431,500,000
Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			977,700,000
Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,246,100,000
Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	11.7
2019	69.8
2018	40.7
2017	24.8
2016	19.8
Prior	47.5
Revolving Loans Amortized Cost Basis	10.3
Total loans, net of deferred fees and costs	224.6
Loans and Leases Receivable, Net of Deferred Income			226,600,000
Real Estate Loan
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			5,938,200,000
Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	70.3
2019	267.7
2018	174.9
2017	115.7
2016	79.5
Prior	66.5
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	774.6
Loans and Leases Receivable, Net of Deferred Income			784,600,000
Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	13.6
2019	45
2018	46.7
2017	20.1
2016	9.5
Prior	13.4
Revolving Loans Amortized Cost Basis	26.7
Total loans, net of deferred fees and costs	175
Loans and Leases Receivable, Net of Deferred Income			1,045,200,000
Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	152.5
Loans and Leases Receivable, Net of Deferred Income			81,600,000
Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			179,000,000
Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,673,700,000
Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	109.4
2019	360.6
2018	303.3
2017	180.4
2016	228
Prior	496.8
Revolving Loans Amortized Cost Basis	18.7
Total loans, net of deferred fees and costs	1,697.2
Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	28.9
2019	78.5
2018	31.3
2017	32.4
2016	28.9
Prior	102.9
Revolving Loans Amortized Cost Basis	1.1
Total loans, net of deferred fees and costs	304
Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	131.5
2019	274.2
2018	200.8
2017	124.6
2016	68.6
Prior	124.8
Revolving Loans Amortized Cost Basis	355.9
Total loans, net of deferred fees and costs	1,280.4
Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	23.5
2019	80.4
2018	56.3
2017	30.7
2016	21.4
Prior	66.6
Revolving Loans Amortized Cost Basis	26.5
Total loans, net of deferred fees and costs	305.4
Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	25.8
2019	43.3
2018	25.7
2017	8.8
2016	4.9
Prior	2.3
Revolving Loans Amortized Cost Basis	145.4
Total loans, net of deferred fees and costs	256.2
Loans and Leases Receivable, Net of Deferred Income			279,100,000
Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	33.8
2019	139.3
2018	103.1
2017	81.8
2016	97.1
Prior	347.6
Revolving Loans Amortized Cost Basis	0.2
Total loans, net of deferred fees and costs	802.9
Consumer Home Equity and HELOC
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	3.4
2019	12.4
2018	11.2
2017	14.8
2016	6.2
Prior	22.1
Revolving Loans Amortized Cost Basis	358
Total loans, net of deferred fees and costs	428.1
Pass
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			8,548,800,000
Pass | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	99.7
2019	349.3
2018	259.5
2017	133.6
2016	176.3
Prior	446.4
Revolving Loans Amortized Cost Basis	20.5
Total loans, net of deferred fees and costs	1,485.3
Pass | Commercial Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,305,000,000
Pass | Land acquisition & development
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	38.3
2019	93.6
2018	53.9
2017	38.9
2016	12.4
Prior	42.1
Revolving Loans Amortized Cost Basis	5.9
Total loans, net of deferred fees and costs	285.1
Loans and Leases Receivable, Net of Deferred Income			295,400,000
Pass | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	22.5
2019	121.8
2018	27.5
2017	6.9
2016	0.3
Prior	0.4
Revolving Loans Amortized Cost Basis	47.2
Total loans, net of deferred fees and costs	226.6
Loans and Leases Receivable, Net of Deferred Income			241,000,000
Pass | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	51.9
2019	222.3
2018	139.3
2017	24.4
2016	10
Prior	0.6
Revolving Loans Amortized Cost Basis	7.7
Total loans, net of deferred fees and costs	456.2
Loans and Leases Receivable, Net of Deferred Income			428,300,000
Pass | Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			964,700,000
Pass | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,235,400,000
Pass | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	11.1
2019	57.1
2018	35.2
2017	22.3
2016	16.1
Prior	36.7
Revolving Loans Amortized Cost Basis	7.8
Total loans, net of deferred fees and costs	186.3
Loans and Leases Receivable, Net of Deferred Income			185,700,000
Pass | Real Estate Loan
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			5,690,800,000
Pass | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			781,500,000
Pass | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,040,800,000
Pass | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			81,600,000
Pass | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			177,700,000
Pass | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,569,400,000
Pass | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	100.5
2019	348.8
2018	283.6
2017	170
2016	194.2
Prior	459
Revolving Loans Amortized Cost Basis	17.6
Total loans, net of deferred fees and costs	1,573.7
Pass | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	116.6
2019	247.2
2018	186.4
2017	120.9
2016	58.9
Prior	118.1
Revolving Loans Amortized Cost Basis	329.4
Total loans, net of deferred fees and costs	1,177.5
Pass | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	22.9
2019	74.1
2018	49.2
2017	29.4
2016	19.6
Prior	63.5
Revolving Loans Amortized Cost Basis	25.7
Total loans, net of deferred fees and costs	284.4
Pass | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	19.3
2019	40.9
2018	18.8
2017	7.4
2016	4.5
Prior	1.8
Revolving Loans Amortized Cost Basis	131.2
Total loans, net of deferred fees and costs	223.9
Loans and Leases Receivable, Net of Deferred Income			247,800,000
Other Assets Especially Mentioned
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			157,500,000
Other Assets Especially Mentioned | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	15.4
2019	3.7
2018	0.7
2017	0.9
2016	1.7
Prior	13.2
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	35.6
Other Assets Especially Mentioned | Commercial Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			84,700,000
Other Assets Especially Mentioned | Land acquisition & development
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0.4
2018	0.1
2017	1
2016	0
Prior	1.5
Revolving Loans Amortized Cost Basis	0.3
Total loans, net of deferred fees and costs	3.3
Loans and Leases Receivable, Net of Deferred Income			3,800,000
Other Assets Especially Mentioned | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0.2
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.2
Loans and Leases Receivable, Net of Deferred Income			900,000
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	1.5
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0.2
Total loans, net of deferred fees and costs	1.7
Loans and Leases Receivable, Net of Deferred Income			1,700,000
Other Assets Especially Mentioned | Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			6,400,000
Other Assets Especially Mentioned | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			2,600,000
Other Assets Especially Mentioned | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.6
2019	2.2
2018	1
2017	1.4
2016	0.1
Prior	5
Revolving Loans Amortized Cost Basis	0.6
Total loans, net of deferred fees and costs	10.9
Loans and Leases Receivable, Net of Deferred Income			14,300,000
Other Assets Especially Mentioned | Real Estate Loan
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			108,000,000
Other Assets Especially Mentioned | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			200,000
Other Assets Especially Mentioned | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			600,000
Other Assets Especially Mentioned | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			0
Other Assets Especially Mentioned | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			400,000
Other Assets Especially Mentioned | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			40,400,000
Other Assets Especially Mentioned | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	2.1
2019	1.7
2018	9.8
2017	4.7
2016	14
Prior	17.4
Revolving Loans Amortized Cost Basis	0.5
Total loans, net of deferred fees and costs	50.2
Other Assets Especially Mentioned | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	4.3
2019	3.6
2018	5.2
2017	2.6
2016	4.5
Prior	0.6
Revolving Loans Amortized Cost Basis	7.4
Total loans, net of deferred fees and costs	28.2
Other Assets Especially Mentioned | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.3
2019	2.5
2018	0.8
2017	0.8
2016	0.5
Prior	1.2
Revolving Loans Amortized Cost Basis	0.7
Total loans, net of deferred fees and costs	6.8
Other Assets Especially Mentioned | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	1.1
2019	0.4
2018	1.8
2017	0
2016	0.1
Prior	0
Revolving Loans Amortized Cost Basis	6
Total loans, net of deferred fees and costs	9.4
Loans and Leases Receivable, Net of Deferred Income			8,500,000
Substandard
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			224,000,000
Substandard | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.2
2019	2.9
2018	0.5
2017	1.3
2016	1.1
Prior	15
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	21
Substandard | Commercial Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			97,300,000
Substandard | Land acquisition & development
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.1
2019	0.1
2018	0.3
2017	0.5
2016	0
Prior	0.5
Revolving Loans Amortized Cost Basis	0.4
Total loans, net of deferred fees and costs	1.9
Loans and Leases Receivable, Net of Deferred Income			1,900,000
Substandard | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	1.2
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	1.2
Loans and Leases Receivable, Net of Deferred Income			2,200,000
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	1
2018	0.4
2017	0
2016	0
Prior	0.1
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	1.5
Loans and Leases Receivable, Net of Deferred Income			1,500,000
Substandard | Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			5,600,000
Substandard | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			7,800,000
Substandard | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	10.5
2018	4.5
2017	1.1
2016	3.6
Prior	5.8
Revolving Loans Amortized Cost Basis	1.9
Total loans, net of deferred fees and costs	27.4
Loans and Leases Receivable, Net of Deferred Income			26,600,000
Substandard | Real Estate Loan
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			137,300,000
Substandard | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			2,900,000
Substandard | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,700,000
Substandard | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			0
Substandard | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			800,000
Substandard | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			60,300,000
Substandard | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	6.6
2019	10.1
2018	9.7
2017	5.6
2016	19.3
Prior	19.9
Revolving Loans Amortized Cost Basis	0.6
Total loans, net of deferred fees and costs	71.8
Substandard | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	10.5
2019	21.7
2018	8.8
2017	0.9
2016	5.2
Prior	5.7
Revolving Loans Amortized Cost Basis	18.7
Total loans, net of deferred fees and costs	71.5
Substandard | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.3
2019	3.7
2018	6.2
2017	0.5
2016	1.3
Prior	1.7
Revolving Loans Amortized Cost Basis	0.1
Total loans, net of deferred fees and costs	13.8
Substandard | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	5.4
2019	2
2018	5.1
2017	1.4
2016	0.3
Prior	0.5
Revolving Loans Amortized Cost Basis	8.2
Total loans, net of deferred fees and costs	22.9
Loans and Leases Receivable, Net of Deferred Income			22,700,000
Doubtful
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			5,900,000
Doubtful | Non-owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0.2
2017	0
2016	0
Prior	0.1
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.3
Doubtful | Commercial Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			800,000
Doubtful | Land acquisition & development
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0.2
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.2
Loans and Leases Receivable, Net of Deferred Income			1,000,000
Doubtful | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0.4
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.4
Loans and Leases Receivable, Net of Deferred Income			0
Doubtful | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0
Loans and Leases Receivable, Net of Deferred Income			0
Doubtful | Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,000,000
Doubtful | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			300,000
Doubtful | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0
Loans and Leases Receivable, Net of Deferred Income			0
Doubtful | Real Estate Loan
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			2,100,000
Doubtful | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			0
Doubtful | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			100,000
Doubtful | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			0
Doubtful | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			100,000
Doubtful | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,600,000
Doubtful | Owner occupied
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.2
2019	0
2018	0.2
2017	0.1
2016	0.5
Prior	0.5
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	1.5
Doubtful | Commercial and floor plans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.1
2019	1.7
2018	0.4
2017	0.2
2016	0
Prior	0.4
Revolving Loans Amortized Cost Basis	0.4
Total loans, net of deferred fees and costs	3.2
Doubtful | Commercial purpose secured by 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0.1
2018	0.1
2017	0
2016	0
Prior	0.2
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.4
Doubtful | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0
Loans and Leases Receivable, Net of Deferred Income			100,000
Total Criticized Loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			387,400,000
Total Criticized Loans | Commercial Real Estate
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			182,800,000
Total Criticized Loans | Land acquisition & development
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			6,700,000
Total Criticized Loans | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,100,000
Total Criticized Loans | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,200,000
Total Criticized Loans | Total construction
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			13,000,000
Total Criticized Loans | Residential
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			10,700,000
Total Criticized Loans | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			40,900,000
Total Criticized Loans | Real Estate Loan
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			247,400,000
Total Criticized Loans | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			3,100,000
Total Criticized Loans | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			4,400,000
Total Criticized Loans | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			0
Total Criticized Loans | Total consumer loans
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			1,300,000
Total Criticized Loans | Commercial
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			104,300,000
Total Criticized Loans | Agricultural
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
Loans and Leases Receivable, Net of Deferred Income			$ 31,300,000
Performing | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	70.3
2019	267.3
2018	174.5
2017	115.6
2016	79.4
Prior	66.3
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	773.4
Performing | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	13.6
2019	44.9
2018	46.6
2017	20
2016	9.4
Prior	13.4
Revolving Loans Amortized Cost Basis	26.7
Total loans, net of deferred fees and costs	174.6
Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	150.8
Performing | Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	28.9
2019	78.5
2018	31.3
2017	32.4
2016	28.9
Prior	102.9
Revolving Loans Amortized Cost Basis	1.1
Total loans, net of deferred fees and costs	304
Performing | Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	33.8
2019	139.1
2018	103.1
2017	81.8
2016	96.5
Prior	346.4
Revolving Loans Amortized Cost Basis	0.2
Total loans, net of deferred fees and costs	800.9
Performing | Consumer Home Equity and HELOC
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	3.4
2019	12.4
2018	11.1
2017	14.6
2016	5.9
Prior	22
Revolving Loans Amortized Cost Basis	358
Total loans, net of deferred fees and costs	427.4
Nonperforming | Indirect consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0.4
2018	0.4
2017	0.1
2016	0.1
Prior	0.2
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	1.2
Nonperforming | Direct consumer
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0.1
2018	0.1
2017	0.1
2016	0.1
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.4
Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	1.7
Nonperforming | Multi-family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0
Nonperforming | Residential 1-4 family
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0.2
2018	0
2017	0
2016	0.6
Prior	1.2
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	2
Nonperforming | Consumer Home Equity and HELOC
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
2019	0
2018	0.1
2017	0.2
2016	0.3
Prior	0.1
Revolving Loans Amortized Cost Basis	0
Total loans, net of deferred fees and costs	0.7
Agricultural | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	1.7
Agricultural | Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	1.7
Agricultural | Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0
Commercial | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	74.2
Commercial | Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	73.4
Commercial | Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	0.8
Total consumer loans | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	76.6
Total consumer loans | Performing | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	75.7
Total consumer loans | Nonperforming | Credit card
Loans and Leases Receivable Recorded Investment, Criticized Loans [Line Items]
2020	$ 0.9

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	$ 8.5	$ 14.4
Additions	0.9	8.4
Valuation adjustments	0	(0.3)
Dispositions	(1.2)	(1.4)
Ending balance	8.2	$ 21.1
Carrying values of foreclosed residential real estate properties	3.1		$ 2.3
Consumer mortgage loans collateralized by residential real estate property in the process of foreclosure	$ 0.8		$ 1.4

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	$ 897.2	$ 571
Derivative Asset, Estimated Fair Value	65.1	23.2
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	913.2	631.2
Derivative Liabilities, Estimated Fair Value	59.5	22.2
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	536	503.2
Derivative Asset, Estimated Fair Value	57.4	21.9
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	536	503.2
Derivative Liabilities, Estimated Fair Value	57.4	21.9
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	361.2	67.8
Derivative Asset, Estimated Fair Value	7.7	1.3
Not Designated as Hedging Instrument | Forward loan sales contracts
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	377.2	128
Derivative Liabilities, Estimated Fair Value	$ 2.1	$ 0.3

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financial Assets
Gross Amounts Recognized	$ 65.1	$ 23.2
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	65.1	23.2
Financial Instruments	0	0.1
Fair Value of Financial Collateral in the Balance Sheet	35.1	18
Net Amount	30	5.1
Financial Liabilities
Gross Amounts Recognized	59.5	22.2
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	59.5	22.2
Financial Instruments	0	0.1
Fair Value of Financial Collateral in the Balance Sheet	0	0
Net Amount	59.5	22.1
Repurchase agreements
Gross Amounts Recognized	614.1	697.6
Gross Amounts Offset in the Balance Sheet		0
Net Amounts in the Balance Sheet	614.1	697.6
Financial Instruments	0	0
Fair Value of Financial Collateral in the Balance Sheet	614.1	697.6
Net Amount	0	0
Total assets and liabilities
Gross Amounts Recognized	673.6	719.8
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	673.6	719.8
Financial Instruments	0	0.1
Fair Value of Financial Collateral in the Balance Sheet	614.1	697.6
Net Amount	59.5	22.1
Interest Rate Swap
Financial Assets
Gross Amounts Recognized	57.4	21.9
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	57.4	21.9
Financial Instruments	0	0.1
Fair Value of Financial Collateral in the Balance Sheet	35.1	18
Net Amount	22.3	3.8
Financial Liabilities
Gross Amounts Recognized	57.4	21.9
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	57.4	21.9
Financial Instruments	0	0.1
Fair Value of Financial Collateral in the Balance Sheet	0	0
Net Amount	57.4	21.8
Mortgage Related Derivatives
Financial Assets
Gross Amounts Recognized	7.7	1.3
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	7.7	1.3
Financial Instruments	0	0
Fair Value of Financial Collateral in the Balance Sheet	0	0
Net Amount	7.7	1.3
Financial Liabilities
Gross Amounts Recognized	2.1	0.3
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts in the Balance Sheet	2.1	0.3
Financial Instruments	0	0
Fair Value of Financial Collateral in the Balance Sheet	0	0
Net Amount	$ 2.1	$ 0.3

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Amount of net fee income recognized in other non-interest income	$ 1	$ 0.8
Amount of net gains recognized in mortgage banking revenues	$ 4.5	$ 0.4

Capital Stock (Details)

Capital Stock (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 08, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Jun. 11, 2019
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value		$ 32.6	$ 2.4
Common Stock, Par or Stated Value Per Share		$ 29.56
Stock repurchased and retired (in shares)			607	39,360	896	22,596
Class A Common Stock
Class of Stock [Line Items]
Shares outstanding (in shares)		42,465,637						43,129,085
Stock Repurchased and Retired During Period, Value			$ 31.2
Shares authorized to repurchase (in shares)									2,500,000
Stock repurchased and retired (in shares)			1,054,700				0	0
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			1,445,300
Class B Common Stock
Class of Stock [Line Items]
Shares outstanding (in shares)		22,086,944						22,117,254
Idaho Independent Bank
Class of Stock [Line Items]
Value of common stock consideration issued	$ 157.3
Idaho Independent Bank | Class A Common Stock
Class of Stock [Line Items]
Number of shares issued as consideration (in shares)	3,871,422
Community 1st Bank | Class A Common Stock
Class of Stock [Line Items]
Number of shares issued as consideration (in shares)	463,134
Director [Member] | Class A Common Stock
Class of Stock [Line Items]
Common Stock, Shares, Issued		291

Earnings per Common Share (Deta

Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Earnings Per Share, Basic and Diluted [Line Items]
Net income	$ 29.3	$ 41.6
Weighted average common shares outstanding for basic earnings per share computation (in shares)	64,790,186	60,311,171
Dilutive effects of stock-based compensation (in shares)	146,921	286,899
Weighted average common shares outstanding for diluted earnings per common share computation (in shares)	64,937,107	60,598,070
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.69
Diluted earnings per common share (in dollars per share)	$ 0.45	$ 0.69
Restricted Stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	113,468	121,452
Unvested restricted stock
Earnings Per Share, Basic and Diluted [Line Items]
Anti-dilutive unvested time restricted stock (in shares)	309,410		154,387

Regulatory Capital (Details)

Regulatory Capital (Details) $ in Millions	Jan. 01, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	$ (24.1)
Total risk-based capital:
Actual, Amount		$ 1,460.3	$ 1,495.3
Actual, Ratio		0.1367	0.1410
Minimum Required for Capital Adequacy Purposes, Amount		$ 854.8	$ 848.5
Minimum Required for Capital Adequacy Purposes, Ratio		0.08000	0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,121.9	$ 1,113.6
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		10.50%	10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,068.5	$ 1,060.6
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.1000	0.1000
Tier 1 risk-based capital:
Actual, Amount		$ 1,367.7	$ 1,422.3
Actual, Ratio		0.1280	0.1341
Minimum Required for Capital Adequacy Purposes, Amount		$ 641.1	$ 636.3
Minimum Required for Capital Adequacy Purposes, Ratio		0.06000	0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 908.2	$ 901.5
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		8.50%	8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 854.8	$ 848.5
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0800	0.0800
Common equity tier 1 risk-based capital:
Actual, Amount		$ 1,283.6	$ 1,338.2
Actual, Ratio		12.01%	12.62%
Minimum Required for Capital Adequacy Purposes, Amount		$ 480.8	$ 477.3
Minimum Required for Capital Adequacy Purposes, Ratio		4.50%	4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 747.9	$ 742.4
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		7.00%	7.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 694.5	$ 689.4
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		6.50%	6.50%
Leverage capital ratio:
Actual, Amount		$ 1,367.7	$ 1,422.3
Actual, Ratio		0.0990	0.1013
Capital Adequacy Purposes and Conservation Buffer, Amount		$ 552.5	$ 561.6
Capital Adequacy Purposes and Conservation Buffer, Ratio		0.04000	0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 690.6	$ 702
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0500	0.0500
Accounts Receivable, Allowance for Credit Loss	29	$ 129.1	$ 73	$ 72.4	$ 73
FIB
Total risk-based capital:
Actual, Amount		$ 1,339.7	$ 1,321.4
Actual, Ratio		0.1258	0.1250
Minimum Required for Capital Adequacy Purposes, Amount		$ 852.3	$ 845.8
Minimum Required for Capital Adequacy Purposes, Ratio		0.08000	0.0800
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 1,118.6	$ 1,110.1
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		10.50%	10.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 1,065.3	$ 1,057.2
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.1000	0.1000
Tier 1 risk-based capital:
Actual, Amount		$ 1,247.1	$ 1,248.4
Actual, Ratio		0.1171	0.1181
Minimum Required for Capital Adequacy Purposes, Amount		$ 639.2	$ 634.3
Minimum Required for Capital Adequacy Purposes, Ratio		0.06000	0.0600
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 905.5	$ 898.6
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		8.50%	8.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 852.3	$ 845.8
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0800	0.0800
Common equity tier 1 risk-based capital:
Actual, Amount		$ 1,247.1	$ 1,248.4
Actual, Ratio		11.71%	11.81%
Minimum Required for Capital Adequacy Purposes, Amount		$ 479.4	$ 475.7
Minimum Required for Capital Adequacy Purposes, Ratio		4.50%	4.50%
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Amount		$ 745.7	$ 740
For Capital Adequacy Purposes Plus Capital Conservation Buffer, Ratio		7.00%	7.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 692.5	$ 687.2
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		6.50%	6.50%
Leverage capital ratio:
Actual, Amount		$ 1,247.1	$ 1,248.4
Actual, Ratio		0.0905	0.0891
Capital Adequacy Purposes and Conservation Buffer, Amount		$ 551.2	$ 560.4
Capital Adequacy Purposes and Conservation Buffer, Ratio		0.0400	0.0400
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Amount		$ 689	$ 700.4
Minimum to Be Well Capitalized Under Prompt Corrective Action Requirements, Ratio		0.0500	0.0500
Retained Earnings [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	(24.1)
Cumulative Effect, Period of Adoption, Adjustment
Leverage capital ratio:
Accounts Receivable, Allowance for Credit Loss	30		$ 30
Change in Accounting Principle, Indirect Effect [Member]
Leverage capital ratio:
Accounts Receivable, Allowance for Credit Loss	$ 6.5

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2020USD ($)
Mortgage Loans Held for Sale
Loss Contingencies [Line Items]
Mortgage loans with recourse provision in effect	$ 1.2
Construction Contracts
Loss Contingencies [Line Items]
Commitments under construction contracts	$ 4.9

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019
Entity Information [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ (2.1)	$ (0.2)	$ 0	$ 0
Credit Extension Commitments	2,122.4		2,067
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	1,480.5		1,450.5
Standby Letter of Credit
Entity Information [Line Items]
Credit Extension Commitments	$ 56.2		$ 42.7
Cumulative Effect, Period of Adoption, Adjustment
Entity Information [Line Items]
Off-Balance Sheet, Credit Loss, Liability		$ (2.3)		$ 0

Other Comprehensive Income_Lo_3

Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Investment securities available-for sale:
Change in net unrealized gain during period, pre-tax	$ 39.2	$ 33.6
Change in net unrealized gain during period, tax expense (benefit)	10.3	8.8
Change in net unrealized gain during period, net of tax	28.9	24.8
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, pre-tax	0	(6)
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, tax expense (benefit)	0	(1.6)
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale, net of tax	0	(4.4)
Defined benefits post-retirement benefit plan:
Change in net actuarial (gain) loss, pre-tax	(0.2)	(0.2)
Change in net actuarial (gain) loss, tax expense (benefit)	(0.1)
Change in net actuarial (gain) loss, net of tax	(0.1)	(0.2)
Other comprehensive income, before tax	39	27.4
Total other comprehensive income, tax expense (benefit)	10.2	7.2
Total other comprehensive income, net of tax amount	$ 28.8	$ 20.2

Other Comprehensive Income_Lo_4

Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net accumulated other comprehensive gains	$ 1,956.1	$ 2,013.9	$ 1,736.9	$ 1,693.9
Net unrealized gains on investment securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net accumulated other comprehensive gains	39.6	10.6
Net accumulated other comprehensive gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net accumulated other comprehensive gains	39.8	11	$ (4.4)	$ (24.6)
Postretirement Health Coverage | Net actuarial gains on defined benefit post-retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial gains on defined benefit post-retirement benefit plans	$ 0.2	$ 0.4

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
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	$ 3,000.3		$ 2,960
Derivative assets	65.1		23.2
Derivative liabilities	59.5		22.2
Related Allowance			3.6
Write downs	0	$ (0.3)
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
Deferred compensation plan assets	0		0
Deferred compensation plan liabilities	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	94.4		100.9
Deferred compensation plan assets	17.3		18.2
Deferred compensation plan liabilities	17.3		18.2
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0		0
Deferred compensation plan assets	0		0
Deferred compensation plan liabilities	0		0
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]
Related Allowance	2.1		3.6
Partial loan charge-offs	0.2		10.1
U.S. Treasury Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	17.1		9
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
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	17.1		9
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
State, county and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	112.3		80.9
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
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	112.3		80.9
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
Obligations of U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	203.6		366.8
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
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	203.6		366.8
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
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	2,414.8		2,317.2
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0		0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	2,414.8		2,317.2
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	0		0
Private mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	40		47.2
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
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	40		47.2
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
Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	210.5		135.7
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
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	210.5		135.7
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
Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	2		3.2
Other investments | 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
Other investments | 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	2		3.2
Other investments | 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
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
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
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			27.3
Other real estate owned | 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]
Other real estate owned	0		0
Other real estate owned | 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]
Other real estate owned	0		0
Other real estate owned | 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]
Other real estate owned	2.3		2.2
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	3,000.3		2,960
Derivative assets	65.1		23.2
Derivative liabilities	59.5		22.2
Deferred compensation plan assets	17.3		18.2
Deferred compensation plan liabilities	17.3		18.2
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	94.4		100.9
Deferred compensation plan assets	17.3		18.2
Deferred compensation plan liabilities	17.3		18.2
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	5		6.2
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
Derivative assets	0		0
Derivative liabilities	0		0
Deferred compensation plan assets	0		0
Deferred compensation plan liabilities	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	3,000.3		2,960
Derivative assets	65.1		23.2
Derivative liabilities	59.5		22.2
Deferred compensation plan assets	17.3		18.2
Deferred compensation plan liabilities	17.3		18.2
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
Derivative assets	0		0
Derivative liabilities	0		0
Deferred compensation plan assets	0		0
Deferred compensation plan liabilities	0		0
Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	3.6		27.6
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	17.1		9
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	112.3		80.9
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	203.6		366.8
Estimated Fair Value | U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	2,414.8		2,317.2
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	40		47.2
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	210.5		135.7
Estimated Fair Value | Other investments | 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	2		3.2
Estimated Fair Value | Collateral dependent loans | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent loans	3.6		27.3
Estimated Fair Value | Other real estate owned | 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]
Other real estate owned	2.3		2.2
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment debt securities available-for-sale	3,000.3		2,960
Derivative assets	65.1		23.2
Derivative liabilities	59.5		22.2
Deferred compensation plan assets	17.3		18.2
Deferred compensation plan liabilities	17.3		18.2
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	5.9		41.3
Long-lived assets to be disposed of by sale	5.2		6.4
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	0.2		0.2
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	57.4		21.9
Derivative liabilities	57.4		21.9
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
Derivative liabilities	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	57.4		21.9
Derivative liabilities	57.4		21.9
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
Derivative liabilities	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	57.4		21.9
Derivative liabilities	57.4		21.9
Interest Rate Lock Commitments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Interest Rate Lock Commitments | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	7.7		1.3
Interest Rate Lock Commitments | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0		0
Interest Rate Lock Commitments | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	7.7		1.3
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 liabilities	0		0
Forward Contracts | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	2.1		0.3
Forward Contracts | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0		0
Forward Contracts | Estimated Fair Value | Fair Value Measured on a Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	2.1		0.3
Long-lived assets to be disposed of by sale | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	0		0
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
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	5		6.2
Long-lived assets to be disposed of by sale | Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets to be disposed of by sale	$ 5		$ 6.2

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value Inputs, Quantitative Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Material write downs	$ 0	$ 0.3
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	5.9		$ 41.3
Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans	3.6		27.6
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			27.3
Collateral dependent loans | Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Collateral dependent loans	$ 3.6		27.3
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
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	0.56
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	0.22
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	$ 2.3		2.2
Other real estate owned | Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Other real estate owned	$ 2.3		2.2
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	0.08
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	0.65
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	0.27
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	$ 5		6.2
Long-lived assets to be disposed of by sale | Significant Unobservable Inputs (Level 3) | Estimated Fair Value | Fair Value Measured on a Non-recurring Basis
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Long-lived assets to be disposed of by sale	$ 5		$ 6.2
Long-lived assets to be disposed of by sale | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Minimum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0
Long-lived assets to be disposed of by sale | Discount Rate | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis | Maximum | Market Approach Valuation Technique
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discount rate	0.37
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

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	Mar. 31, 2020	Dec. 31, 2019
Financial assets:
Investment debt securities available-for-sale	$ 3,000.3	$ 2,960
Investment debt securities held-to-maturity	72.6	94.5
Derivative assets	65.1	23.2
Financial liabilities:
Derivative liabilities	59.5	22.2
Carrying Amount
Financial assets:
Cash and cash equivalents	869.2	1,076.8
Investment debt securities available-for-sale	3,000.3	2,960
Investment debt securities held-to-maturity	70.2	92.3
Accrued interest receivable	46.3	46.7
Mortgage servicing rights, net	27.8	30.2
Loans held for sale	94.4	100.9
Net loans held for investment	8,788.9	8,857.7
Derivative assets	65.1	23.2
Deferred compensation plan assets	17.3	18.2
Total financial assets	12,979.5	13,206
Financial liabilities:
Total deposits, excluding time deposits	10,244.5	10,213.5
Time deposits	1,320.6	1,450
Securities sold under repurchase agreements	614.1	697.6
Accrued interest payable	10.3	12.1
Long-term debt	13.9	13.9
Subordinated debentures held by subsidiary trusts	86.9	86.9
Derivative liabilities	59.5	22.2
Deferred compensation plan liabilities	17.3	18.2
Total financial liabilities	12,367.1	12,514.4
Estimated Fair Value
Financial assets:
Cash and cash equivalents	869.2	1,076.8
Investment debt securities available-for-sale	3,000.3	2,960
Investment debt securities held-to-maturity	72.6	94.5
Accrued interest receivable	46.3	46.7
Mortgage servicing rights, net	27.8	34.8
Loans held for sale	94.4	100.9
Net loans held for investment	8,856.5	8,930.7
Derivative assets	65.1	23.2
Deferred compensation plan assets	17.3	18.2
Total financial assets	13,049.5	13,285.8
Financial liabilities:
Total deposits, excluding time deposits	10,244.5	10,213.5
Time deposits	1,324.9	1,446.6
Securities sold under repurchase agreements	614.1	697.6
Accrued interest payable	10.3	12.1
Long-term debt	10.5	10.4
Subordinated debentures held by subsidiary trusts	81.5	81.3
Derivative liabilities	59.5	22.2
Deferred compensation plan liabilities	17.3	18.2
Total financial liabilities	12,362.6	12,501.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	869.2	1,076.8
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	869.2	1,076.8
Financial liabilities:
Total deposits, excluding time deposits	10,244.5	10,213.5
Time deposits	0	0
Securities sold under repurchase agreements	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	10,244.5	10,213.5
Significant Other Observable Inputs (Level 2) | Estimated Fair Value
Financial assets:
Cash and cash equivalents	0	0
Investment debt securities available-for-sale	3,000.3	2,960
Investment debt securities held-to-maturity	72.6	94.5
Accrued interest receivable	46.3	46.7
Mortgage servicing rights, net	27.8	34.8
Loans held for sale	94.4	100.9
Net loans held for investment	8,852.9	8,906.7
Derivative assets	65.1	23.2
Deferred compensation plan assets	17.3	18.2
Total financial assets	12,176.7	12,185
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	1,324.9	1,446.6
Securities sold under repurchase agreements	614.1	697.6
Accrued interest payable	10.3	12.1
Long-term debt	10.5	10.4
Subordinated debentures held by subsidiary trusts	81.5	81.3
Derivative liabilities	59.5	22.2
Deferred compensation plan liabilities	17.3	18.2
Total financial liabilities	2,118.1	2,288.4
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	0	0
Net loans held for investment	3.6	24
Derivative assets	0	0
Deferred compensation plan assets	0	0
Total financial assets	3.6	24
Financial liabilities:
Total deposits, excluding time deposits	0	0
Time deposits	0	0
Securities sold under repurchase agreements	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

Recent Authoritative Accounti_2

Recent Authoritative Accounting Guidance (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ 1,956.1		$ 2,013.9	$ 1,736.9	$ 1,693.9
Off-balance sheet credit liability	2.1	$ 0.2	0	0
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Off-balance sheet credit liability		2.3		0
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses		30
Deferred tax assets		8.2
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ 897.6		$ 953.6	$ 874.7	$ 851.8
Retained earnings | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity		24.1
Off-balance sheet credit liability		$ 2.3

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Apr. 29, 2020	Mar. 27, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Loans and Leases Receivable, Gross	$ 9,012.4		$ 1,000	$ 9,031.6
Financing Receivable, Troubled Debt Restructuring, Premodification	1,100
Financing Receivable, Modifications, Recorded Investment, Non Accrual	17.4			$ 19.4
Class A Common Stock | Subsequent Event
Subsequent Event [Line Items]
Dividend amount per share (in dollars)		$ 0.34
Mortgages [Member]
Subsequent Event [Line Items]
Financing Receivable, Modifications, Recorded Investment, Non Accrual	$ 46.6