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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost $ 647.4  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost 1,482.4  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost 1,313.4  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost 1,416.1  
Amortized Cost 4,859.3 $ 3,932.7
Available-for-sale Securities, Debt Maturities, Fair Value, Rolling Maturity    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 742.8  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value 1,577.4  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value 1,165.6  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value 1,334.7  
Estimated Fair Value 4,820.5 4,008.7
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost 696.4  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost 374.5  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost 275.6  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost 341.1  
Amortized Cost 1,687.6 51.6
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity    
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 687.2  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value 363.6  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value 276.2  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value 340.5  
Estimated Fair Value 1,667.5 55.0
Available-for-sale Securities and Held-to-maturity Securities    
Securities sold under agreements to repurchase 2,617.8 2,323.0
Pledged assets separately reported, securities pledged for repurchase agreements, at fair value 2,610.8 2,383.6
Mortgage Backed Securities, Variable Rate    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Rolling Maturity    
Amortized Cost $ 84.8 $ 220.7