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Borrowings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 24, 2022
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Instrument [Line Items]        
Securities sold under customer repurchase agreements   $ 616.0   $ 589.0
Gain on extinguishment of debt   6.0 $ 0.0  
Debt instrument, collateral amount   24,900.0    
Pledged financial instruments, not separately reported, loans receivable, for federal home loan bank debt   19,900.0    
Line of credit facility, remaining borrowing capacity   75.0    
Government agency | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Securities sold under customer repurchase agreements   538.0   508.0
Commercial mortgage-backed securities | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Securities sold under customer repurchase agreements   78.0   81.0
Securities Assets | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Securities sold under customer repurchase agreements   638.0   619.0
Trust Preferred Securities Subject to Mandatory Redemption        
Debt Instrument [Line Items]        
Long-term debt, gross   128.0   128.0
Fixed-to-Floating subordinated notes at 3.375% | Subordinated Debt        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 350.0    
Debt instrument, stated interest rate   3.375%    
Fixed subordinated notes at 6.125% | Subordinated Debt        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 400.0    
Debt instrument, stated interest rate   6.125%    
Fixed-to-Fixed subordinated notes at 4.125% | Subordinated Debt        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 100.0    
Debt instrument, stated interest rate   4.125%    
Junior subordinated debentures | Subordinated Debt        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 132.0    
Other secured financings | Secured Debt        
Debt Instrument [Line Items]        
Debt instrument, collateral amount   15.0    
Debt instrument, face amount   15.0    
Other secured financings | Secured Debt | Federal Reserve Bank of Richmond        
Debt Instrument [Line Items]        
Line of credit facility, additional borrowing capacity   4,200.0    
Long-term line of credit   0.0   $ 0.0
Fixed rate senior unsecured notes | Senior Notes        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 866.0    
Debt, weighted average interest rate   3.70%    
Fixed rate senior unsecured notes assumed in business combination | Senior Notes        
Debt Instrument [Line Items]        
Redemption of debt $ 2,900.0      
Gain on extinguishment of debt $ 6.0      
Unsecured term loan at 1-month LIBOR plus 1.10% | Senior Notes        
Debt Instrument [Line Items]        
Long-term debt, gross   $ 64.0    
Unsecured term loan at 1-month LIBOR plus 1.10% | Senior Notes | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.10%