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Fair Value Measurements - Financial Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks $ 507.6 $ 484.2
Short-term investments 744.3 316.8
Debt securities held-to-maturity 3,863.4 3,869.2
FHLB and FRB stock 407.2 341.1
Time deposits 8,840.2 9,205.5
FHLB advances 4,489.7 3,125.4
Federal funds purchased 1,120.0 1,620.0
Customer repurchase agreements 301.1 409.1
Notes and debentures 1,012.6 993.1
Impaired loans   61.9
Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans   61.9
Collateral Pledged | Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans 15.2  
Level 1 | Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans   0.0
Level 2 | Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans   0.0
Level 3 | Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans   61.9
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 507.6 484.2
Short-term investments 744.3 316.8
Debt securities held-to-maturity 3,861.5 3,869.2
FHLB and FRB stock 407.2 341.1
Total loans, net 43,927.1 43,287.6
Time deposits 8,840.2 9,205.5
Other deposits 35,900.9 34,384.0
FHLB advances 4,489.7 3,125.4
Federal funds purchased 1,120.0 1,620.0
Customer repurchase agreements 301.1 409.1
Other borrowings  
Notes and debentures 1,012.6 993.1
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 507.6 484.2
Short-term investments 744.3 316.8
Debt securities held-to-maturity 4,065.2 4,020.0
FHLB and FRB stock 407.2 341.1
Total loans, net 44,597.2 43,355.0
Time deposits 8,891.5 9,218.1
Other deposits 35,900.9 34,384.0
FHLB advances 4,490.7 3,125.5
Federal funds purchased 1,120.0 1,620.0
Customer repurchase agreements 301.1 409.1
Other borrowings   11.0
Notes and debentures 995.8 1,021.3
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 507.6 484.2
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
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks 0.0 0.0
Short-term investments 744.3 316.8
Debt securities held-to-maturity 4,063.7 4,018.5
FHLB and FRB stock 407.2 341.1
Total loans, net 9,999.3 10,072.1
Time deposits 8,891.5 9,218.1
Other deposits 35,900.9 34,384.0
FHLB advances 4,490.7 3,125.5
Federal funds purchased 1,120.0 1,620.0
Customer repurchase agreements 301.1 409.1
Other borrowings   11.0
Notes and debentures 995.8 1,021.3
Fair Value | Level 3    
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 34,597.9 33,282.9
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