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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis
Financial assets and financial liabilities measured at fair value on a recurring basis are as follows:
 Fair Value Measurements at Reporting Date Using
As of December 31, 2022BalanceQuoted 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$642.7 $— $642.7 $— 
State, county, and municipal securities263.7 — 263.7 — 
Obligations of U.S. government agencies198.9 — 198.9 — 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations4,259.7 — 4,259.7 — 
Private mortgage-backed securities228.0 — 228.0 — 
Collateralized loan obligations1,111.6 — 1,111.6 — 
Corporate Securities241.5 — 241.5 — 
Loans held for sale79.9 — 79.9 — 
Derivative assets:
Interest rate swap contracts45.1 — 45.1 — 
Forward loan sales contracts0.1 — 0.1 — 
Derivative liabilities:
Interest rate collars5.4 — 5.4 — 
Interest rate swap contracts154.2 — 154.2 — 
Deferred compensation plan assets18.7 — 18.7 — 
Deferred compensation plan liabilities18.7 — 18.7 — 
 Fair Value Measurements at Reporting Date Using
As of December 31, 2021BalanceQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Investment debt securities available-for-sale:    
U.S. Treasury notes$684.7 $684.7 $— $— 
State, county, and municipal securities427.5 — 427.5 — 
Obligations of U.S. government agencies346.9 — 346.9 — 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations2,018.1 — 2,018.1 — 
Private mortgage-backed securities173.4 — 173.4 — 
Collateralized loan obligations899.4 — 899.4 — 
Corporate securities270.5 — 270.5 — 
Loans held for sale30.1 — 30.1 — 
Derivative assets:
Interest rate swap contracts26.3 — 26.3 — 
Interest rate lock commitments1.8 — 1.8 — 
Derivative liabilities:
Interest rate swap contracts18.2 — 18.2 — 
Deferred compensation plan assets21.4 — 21.4 — 
Deferred compensation plan liabilities21.4 — 21.4 — 
Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Non-Recurring Basis The following table presents information about the Company’s assets and liabilities measured at fair value on a non-recurring basis:
  Fair Value Measurements at Reporting Date Using
As of December 31, 2022BalanceQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total Gains (Losses)
Collateral-dependent loans$39.1 $— $— $39.1 $— 
Other real estate owned12.7 — — 12.7 — 
Long-lived assets to be disposed of by sale5.5 — — 5.5 (0.2)

  Fair Value Measurements at Reporting Date Using
As of December 31, 2021BalanceQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total Gains (Losses)
Collateral-dependent loans$11.7 $— $— $11.7 $— 
Other real estate owned2.0 — — 2.0 — 
Long-lived assets to be disposed of by sale1.3 — — 1.3 — 
Fair Value Inputs, Assets, Quantitative Information
The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:
As of December 31, 2022Fair ValueValuation TechniqueUnobservable InputsRange (Weighted Average)
Collateral-dependent loans$39.1 AppraisalAppraisal adjustment0%-45%(7%)
Other real estate owned12.7 AppraisalAppraisal adjustment15-36(22)
Long-lived assets to be disposed of by sale5.5 AppraisalAppraisal adjustment0-6(3)
As of December 31, 2021
Collateral-dependent loans$11.7 AppraisalAppraisal adjustment1%-18%(7%)
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 December 31, 2022Carrying AmountEstimated
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$870.5 $870.5 $870.5 $— $— 
Investment debt securities available-for-sale6,946.1 6,946.1 — 6,946.1 — 
Investment debt securities held-to-maturity3,451.8 3,052.2 — 3,052.2 — 
Accrued interest receivable118.3 118.3 — 118.3 — 
Mortgage servicing rights, net31.1 37.4 — 37.4 — 
Loans held for sale79.9 79.9 — 79.9 — 
Net loans held for investment17,879.1 17,552.1 — 17,513.0 39.1 
Derivative assets45.2 45.2 — 45.2 — 
Deferred compensation plan assets18.7 18.7 — 18.7 — 
Total financial assets$29,440.7 $28,720.4 $870.5 $27,810.8 $39.1 
Financial liabilities:
Total deposits, excluding time deposits$23,145.2 $23,145.2 $23,145.2 $— $— 
Time deposits1,928.4 1,876.1 — 1,876.1 — 
Securities sold under repurchase agreements1,052.9 1,052.9 — 1,052.9 — 
Other borrowed funds2,327.0 2,327.0 — 2,327.0 — 
Accrued interest payable14.5 14.5 — 14.5 — 
Long-term debt120.8 116.3 — 116.3 — 
Subordinated debentures held by subsidiary trusts163.1 155.8 — 155.8 — 
Derivative liabilities159.6 159.6 — 159.6 — 
Deferred compensation plan liabilities18.7 18.7 — 18.7 — 
Total financial liabilities$28,930.2 $28,866.1 $23,145.2 $5,720.9 $— 
Fair Value Measurements at Reporting Date Using
As of December 31, 2021Carrying AmountEstimated
Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
Financial assets:     
Cash and cash equivalents$2,344.8 $2,344.8 $2,344.8 $— $— 
Investment debt securities available-for-sale4,820.5 4,820.5 684.7 4,135.8 — 
Investment debt securities held-to-maturity1,687.6 1,667.5 — 1,667.5 — 
Accrued interest receivable47.4 47.4 — 47.4 — 
Mortgage servicing rights, net28.2 28.2 — 28.2 — 
Loans held for sale30.1 30.1 — 30.1 — 
Net loans held for investment9,209.4 9,254.3 — 9,242.6 11.7 
Derivative assets28.1 28.1 — 28.1 — 
Deferred compensation plan assets21.4 21.4 — 21.4 — 
Total financial assets$18,217.5 $18,242.3 $3,029.5 $15,201.1 $11.7 
Financial liabilities:    
Total deposits, excluding time deposits$15,303.1 $15,303.1 $15,303.1 $— $— 
Time deposits966.5 963.1 — 963.1 — 
Securities sold under repurchase agreements1,051.1 1,051.1 — 1,051.1 — 
Accrued interest payable3.7 3.7 — 3.7 — 
Long-term debt112.4 120.7 — 120.7 — 
Subordinated debentures held by subsidiary trusts87.0 85.5 — 85.5 — 
Derivative liabilities18.2 18.2 — 18.2 — 
Deferred compensation plan liabilities21.4 21.4 — 21.4 — 
Total financial liabilities$17,563.4 $17,566.8 $15,303.1 $2,263.7 $—