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Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial assets:    
Estimated Fair Value $ 4,820.5 $ 4,008.7
Held-to-maturity investment securities, estimated fair value 1,667.5 55.0
Derivative assets 28.1 55.3
Deferred compensation plan assets 21.4 19.1
Financial liabilities:    
Derivative liabilities 18.2 17.9
Deferred compensation plan liabilities 21.4 19.1
Carrying Amount    
Financial assets:    
Cash and cash equivalents 2,344.8 2,276.8
Estimated Fair Value 4,820.5 4,008.7
Held-to-maturity investment securities, estimated fair value 1,687.6 51.6
Accrued interest receivable 47.4 51.1
Mortgage servicing rights, net 28.2 24.0
Loans Held-for-sale, Fair Value Disclosure 30.1 74.0
Net loans held for investment 9,209.4 9,663.2
Derivative assets 28.1 55.3
Deferred compensation plan assets 21.4 19.1
Total financial assets 18,217.5 16,223.8
Financial liabilities:    
Total deposits, excluding time deposits 15,303.1 13,158.3
Time deposits 966.5 1,058.7
Securities sold under repurchase agreements 1,051.1 1,091.4
Accrued interest payable 3.7 5.8
Long-term debt 112.4 112.4
Subordinated debentures held by subsidiary trusts 87.0 87.0
Derivative liabilities 18.2 17.9
Deferred compensation plan liabilities 21.4 19.1
Total financial liabilities 17,563.4 15,550.6
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 2,344.8 2,276.8
Estimated Fair Value 4,820.5 4,008.7
Held-to-maturity investment securities, estimated fair value 1,667.5 55.0
Accrued interest receivable 47.4 51.1
Mortgage servicing rights, net 28.2 24.0
Loans Held-for-sale, Fair Value Disclosure 30.1 74.0
Net loans held for investment 9,254.3 9,785.6
Derivative assets 28.1 55.3
Deferred compensation plan assets 21.4 19.1
Total financial assets 18,242.3 16,349.6
Financial liabilities:    
Total deposits, excluding time deposits 15,303.1 13,158.3
Time deposits 963.1 1,061.1
Securities sold under repurchase agreements 1,051.1 1,091.4
Accrued interest payable 3.7 5.8
Long-term debt 120.7 116.5
Subordinated debentures held by subsidiary trusts 85.5 81.3
Derivative liabilities 18.2 17.9
Deferred compensation plan liabilities 21.4 19.1
Total financial liabilities 17,566.8 15,551.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 2,344.8 2,276.8
Estimated Fair Value 684.7 0.0
Held-to-maturity investment securities, estimated fair value 0.0 0.0
Accrued interest receivable 0.0 0.0
Mortgage servicing rights, net 0.0 0.0
Loans Held-for-sale, Fair Value Disclosure 0.0 0.0
Net loans held for investment 0.0 0.0
Derivative assets 0.0 0.0
Deferred compensation plan assets 0.0 0.0
Total financial assets 3,029.5 2,276.8
Financial liabilities:    
Total deposits, excluding time deposits 15,303.1 13,158.3
Time deposits 0.0 0.0
Securities sold under repurchase agreements 0.0 0.0
Accrued interest payable 0.0 0.0
Long-term debt 0.0 0.0
Subordinated debentures held by subsidiary trusts 0.0 0.0
Derivative liabilities 0.0 0.0
Deferred compensation plan liabilities 0.0 0.0
Total financial liabilities 15,303.1 13,158.3
Significant Other Observable Inputs (Level 2) | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 0.0 0.0
Estimated Fair Value 4,135.8 4,008.7
Held-to-maturity investment securities, estimated fair value 1,667.5 55.0
Accrued interest receivable 47.4 51.1
Mortgage servicing rights, net 28.2 24.0
Loans Held-for-sale, Fair Value Disclosure 30.1 74.0
Net loans held for investment 9,242.6 9,770.9
Derivative assets 28.1 55.3
Deferred compensation plan assets 21.4 19.1
Total financial assets 15,201.1 14,058.1
Financial liabilities:    
Total deposits, excluding time deposits 0.0 0.0
Time deposits 963.1 1,061.1
Securities sold under repurchase agreements 1,051.1 1,091.4
Accrued interest payable 3.7 5.8
Long-term debt 120.7 116.5
Subordinated debentures held by subsidiary trusts 85.5 81.3
Derivative liabilities 18.2 17.9
Deferred compensation plan liabilities 21.4 19.1
Total financial liabilities 2,263.7 2,393.1
Significant Unobservable Inputs (Level 3) | Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 0.0 0.0
Estimated Fair Value 0.0 0.0
Held-to-maturity investment securities, estimated fair value 0.0 0.0
Accrued interest receivable 0.0 0.0
Mortgage servicing rights, net 0.0 0.0
Loans Held-for-sale, Fair Value Disclosure 0.0 0.0
Net loans held for investment 11.7 14.7
Derivative assets 0.0 0.0
Deferred compensation plan assets 0.0 0.0
Total financial assets 11.7 14.7
Financial liabilities:    
Total deposits, excluding time deposits 0.0 0.0
Time deposits 0.0 0.0
Securities sold under repurchase agreements 0.0 0.0
Accrued interest payable 0.0 0.0
Long-term debt 0.0 0.0
Subordinated debentures held by subsidiary trusts 0.0 0.0
Derivative liabilities 0.0 0.0
Deferred compensation plan liabilities 0.0 0.0
Total financial liabilities $ 0.0 $ 0.0