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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks $ 484.2 $ 665.7  
Short-term investments 316.8 266.3  
Debt securities held-to-maturity 3,869.2 3,792.3  
FHLB and FRB stock 341.1 303.4  
Time deposits 9,205.5 6,916.2  
FHLB advances 3,125.4 2,404.5 $ 2,774.4
Federal funds purchased 1,620.0 845.0 820.0
Customer repurchase agreements 409.1 332.9 301.6
Other borrowings 0.0 11.0 $ 207.8
Notes and debentures 993.1 895.8  
Impaired loans 61.9 55.2  
Carrying Amount [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 484.2 665.7  
Short-term investments 316.8 266.3  
Debt securities held-to-maturity 3,869.2 3,792.3  
FHLB and FRB stock 341.1 303.4  
Total loans, net 43,287.6 34,945.8  
Time deposits 9,205.5 6,916.2  
Other deposits 34,384.0 29,242.8  
FHLB advances 3,125.4 2,404.5  
Federal funds purchased 1,620.0 845.0  
Customer repurchase agreements 409.1 332.9  
Other borrowings   11.0  
Notes and debentures 993.1 895.8  
Estimated Fair Value Measurements [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 484.2 665.7  
Short-term investments 316.8 266.3  
Debt securities held-to-maturity 4,020.0 3,775.9  
FHLB and FRB stock 341.1 303.4  
Total loans, net 43,355.0 34,606.3  
Time deposits 9,218.1 6,884.0  
Other deposits 34,384.0 29,242.8  
FHLB advances 3,125.5 2,404.5  
Federal funds purchased 1,620.0 845.0  
Customer repurchase agreements 409.1 332.9  
Other borrowings   11.0  
Notes and debentures 1,021.3 893.4  
Estimated Fair Value Measurements [Member] | Level 1 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 484.2 665.7  
Short-term investments 0.0 0.0  
Debt securities held-to-maturity 0.0 0.0  
FHLB and FRB stock 0.0 0.0  
Total loans, net 0.0 0.0  
Time deposits 0.0 0.0  
Other deposits 0.0 0.0  
FHLB advances 0.0 0.0  
Federal funds purchased 0.0 0.0  
Customer repurchase agreements 0.0 0.0  
Other borrowings   0.0  
Notes and debentures 0.0 0.0  
Estimated Fair Value Measurements [Member] | Level 2 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 0.0 0.0  
Short-term investments 316.8 266.3  
Debt securities held-to-maturity 4,018.5 3,774.4  
FHLB and FRB stock 341.1 303.4  
Total loans, net 10,072.1 7,806.1  
Time deposits 9,218.1 6,884.0  
Other deposits 34,384.0 29,242.8  
FHLB advances 3,125.5 2,404.5  
Federal funds purchased 1,620.0 845.0  
Customer repurchase agreements 409.1 332.9  
Other borrowings   11.0  
Notes and debentures 1,021.3 893.4  
Estimated Fair Value Measurements [Member] | Level 3 [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and due from banks 0.0 0.0  
Short-term investments 0.0 0.0  
Debt securities held-to-maturity 1.5 1.5  
FHLB and FRB stock 0.0 0.0  
Total loans, net 33,282.9 26,800.2  
Time deposits 0.0 0.0  
Other deposits 0.0 0.0  
FHLB advances 0.0 0.0  
Federal funds purchased 0.0 0.0  
Customer repurchase agreements 0.0 0.0  
Other borrowings   0.0  
Notes and debentures $ 0.0 $ 0.0