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Borrowings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 24, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]            
Securities sold under customer repurchase agreements   $ 646.0   $ 646.0   $ 589.0
Gain on extinguishment of debt   0.0 $ 0.0 6.0 $ 0.0  
Debt instrument, collateral amount   25,800.0   25,800.0    
Line of credit facility, remaining borrowing capacity   75.0   75.0    
Government agency | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Securities sold under customer repurchase agreements           508.0
Commercial mortgage-backed securities | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Securities sold under customer repurchase agreements           81.0
Securities Assets | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Securities sold under customer repurchase agreements   658.0   658.0   619.0
Trust Preferred Securities Subject to Mandatory Redemption            
Debt Instrument [Line Items]            
Long-term debt, gross   128.0   128.0   128.0
Fixed-to-Floating subordinated notes at 3.375% | Subordinated Debt            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 350.0   $ 350.0    
Debt instrument, stated interest rate   3.375%   3.375%    
Fixed subordinated notes at 6.125% | Subordinated Debt            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 400.0   $ 400.0    
Debt instrument, stated interest rate   6.125%   6.125%    
Fixed-to-Fixed subordinated notes at 4.125% | Subordinated Debt            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 100.0   $ 100.0    
Debt instrument, stated interest rate   4.125%   4.125%    
Junior subordinated debentures | Subordinated Debt            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 132.0   $ 132.0    
Other secured financings | Secured Debt            
Debt Instrument [Line Items]            
Debt instrument, collateral amount   16.0   16.0    
Debt instrument, face amount   16.0   16.0    
Other secured financings | Secured Debt | Federal Reserve Bank of Richmond            
Debt Instrument [Line Items]            
Debt instrument, collateral amount   5,100.0   5,100.0    
Line of credit facility, additional borrowing capacity   4,200.0   4,200.0    
Long-term line of credit   0.0   0.0   $ 0.0
Fixed rate senior unsecured notes | Senior Notes            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 866.0   $ 866.0    
Debt, weighted average interest rate   3.70%   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   $ 61.0   $ 61.0    
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%    
Notes Payable To FHLB | Secured Debt | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Debt instrument, collateral amount   $ 20,700.0   $ 20,700.0