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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2021
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, 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 — 
 Fair Value Measurements at Reporting Date Using
As of December 31, 2020BalanceQuoted 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:    
State, county, and municipal securities$465.9 $— $465.9 $— 
Obligations of U.S. government agencies331.9 — 331.9 — 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations2,897.6 — 2,897.6 — 
Private mortgage-backed securities10.9 — 10.9 — 
Corporate securities302.2 — 302.2 — 
Other investments0.2 — 0.2 — 
Loans held for sale74.0 — 74.0 — 
Derivative assets:
Interest rate swap contracts52.0 — 52.0 — 
Interest rate lock commitments3.3 — 3.3 — 
Derivative liabilities:
Interest rate swap contracts16.8 — 16.8 — 
Forward loan sales contracts1.1 — 1.1 — 
Deferred compensation plan assets19.1 — 19.1 — 
Deferred compensation plan liabilities19.1 — 19.1 — 
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, 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 Measurements at Reporting Date Using
As of December 31, 2020BalanceQuoted 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$14.7 $— $— $14.7 $(2.8)
Other real estate owned2.5 — — 2.5 — 
Long-lived assets to be disposed of by sale5.3 — — 5.3 (0.2)
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, 2021Fair ValueValuation TechniqueUnobservable InputsRange (Weighted Average)
Collateral-dependent loans$11.7 AppraisalAppraisal adjustment1.4%-18%(7%)
As of December 31, 2020
Collateral-dependent loans$14.7 AppraisalAppraisal adjustment0%-18%(9%)
Long-lived assets to be disposed of by sale5.3 AppraisalAppraisal adjustment0%-37%(4%)
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, 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 $— 
Fair Value Measurements at Reporting Date Using
As of December 31, 2020Carrying 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$2,276.8 $2,276.8 $2,276.8 $— $— 
Investment debt securities available-for-sale4,008.7 4,008.7 — 4,008.7 — 
Investment debt securities held-to-maturity51.6 55.0 — 55.0 — 
Accrued interest receivable51.1 51.1 — 51.1 — 
Mortgage servicing rights, net24.0 24.0 — 24.0 — 
Loans held for sale74.0 74.0 — 74.0 — 
Net loans held for investment9,663.2 9,785.6 — 9,770.9 14.7 
Derivative assets55.3 55.3 — 55.3 — 
Deferred compensation plan assets19.1 19.1 — 19.1 — 
Total financial assets$16,223.8 $16,349.6 $2,276.8 $14,058.1 $14.7 
Financial liabilities:    
Total deposits, excluding time deposits$13,158.3 $13,158.3 $13,158.3 $— $— 
Time deposits1,058.7 1,061.1 — 1,061.1 — 
Securities sold under repurchase agreements1,091.4 1,091.4 — 1,091.4 — 
Accrued interest payable5.8 5.8 — 5.8 — 
Long-term debt112.4 116.5 — 116.5 — 
Subordinated debentures held by subsidiary trusts87.0 81.3 — 81.3 — 
Derivative liabilities17.9 17.9 — 17.9 — 
Deferred compensation plan liabilities19.1 19.1 — 19.1 — 
Total financial liabilities$15,550.6 $15,551.4 $13,158.3 $2,393.1 $—