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Fair Value Measurements (Tables)
 6 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 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 September 30, 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$691.8 $—$691.8 $—
State, county, and municipal securities439.9 —439.9 —
Obligations of U.S. government agencies325.9 —325.9 —
U.S. agencies mortgage-backed securities & collateralized mortgage obligations2,031.3 —2,031.3 —
Private mortgage-backed securities83.5 —83.5 —
Collateralized loan obligations453.0 —453.0 —
Corporate securities378.2 —378.2 —
Loans held for sale42.5 —42.5 —
Derivative assets:
Interest rate swap contracts30.1 —30.1 —
Interest rate lock commitments3.1 —3.1 —
Forward loan sale contracts0.9 —0.9 —
Derivative liabilities:
Interest rate swap contracts21.1 —21.1 —
Deferred compensation plan assets21.6 —21.6 —
Deferred compensation plan liabilities21.6 —21.6 —
 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. agencies 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 September 30, 2021BalanceQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Collateral dependent loans$12.5 $—$—$12.5 
Long-lived assets to be disposed of by sale3.2 ——3.2 
 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)
Collateral dependent loans$14.7 $—$—$14.7 
Long-lived assets to be disposed of by sale5.3 ——5.3 
Fair Value Inputs, Assets, Quantitative Information
The following table presents additional quantitative information about assets measured at fair value on a non-recurring basis and for which the Company has utilized Level 3 inputs to determine fair values:
Fair Value As of
September 30, 2021December 31, 2020Valuation
Technique		Unobservable
Inputs		Range
(Weighted Average)
Collateral dependent loans$12.5 $14.7 AppraisalAppraisal adjustment0%-18%(9%)
Long-lived assets to be disposed of by sale3.2 5.3 AppraisalAppraisal adjustment0%-0%0%
  
Fair Value, by Balance Sheet Grouping  
The estimated fair values of financial instruments that are reported in the Company’s consolidated balance sheets, and are segregated by the level of the valuation inputs within the fair value hierarchy that are utilized to measure fair value, are as follows:
 Fair Value Measurements at Reporting Date Using
As of September 30, 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$2,233.5 $2,233.5 $2,233.5 $— $— 
Investment debt securities available-for-sale4,403.6 4,403.6 — 4,403.6 — 
Investment debt securities held-to-maturity1,618.1 1,632.5 — 1,632.5 — 
Accrued interest receivable52.9 52.9 — 52.9 — 
Mortgage servicing rights, net27.0 27.4 — 27.4 — 
Loans held for sale42.5 42.5 — 42.5 — 
Net loans held for investment9,487.4 9,587.1 — 9,574.6 12.5 
Derivative assets34.1 34.1 — 34.1 — 
Deferred compensation plan assets21.6 21.6 — 21.6 — 
Total financial assets$17,920.7 $18,035.2 $2,233.5 $15,789.2 $12.5 
Financial liabilities:
Total deposits, excluding time deposits$15,019.3 $15,019.3 $15,019.3 $— $— 
Time deposits988.0 987.3 — 987.3 — 
Securities sold under repurchase agreements1,007.5 1,007.5 — 1,007.5 — 
Accrued interest payable6.6 6.6 — 6.6 — 
Long-term debt112.4 121.5 — 121.5 — 
Subordinated debentures held by subsidiary trusts87.0 83.9 — 83.9 — 
Derivative liabilities21.1 21.1 — 21.1 — 
Deferred compensation plan liabilities21.6 21.6 — 21.6 — 
Total financial liabilities$17,263.5 $17,268.8 $15,019.3 $2,249.5 $— 
 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 $—