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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
Aug. 05, 2014
Dec. 31, 2023
Dec. 31, 2022
Line of Credit Facility [Line Items]      
Debt instrument, unused borrowing capacity, amount   $ 2,490,213 $ 752,509
Line of credit facility, maximum borrowing capacity   2,200,000  
Long-term line of credit   98,614 107,919
Proceeds from issuance of subordinated long-term debt $ 68,800    
Subordinated Debt      
Line of Credit Facility [Line Items]      
Face amount $ 70,000 $ 69,900 $ 69,800
Interest rate, stated percentage 5.75% 5.75% 5.75%
Payments of debt issuance costs $ 1,200    
C D A R S      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 1,700,000  
Long-term line of credit   94,000  
I N D      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   786,500  
Long-term line of credit   786,500  
Federal Reserve Bank of Richmond      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   601,500  
Federal Funds      
Line of Credit Facility [Line Items]      
Debt instrument, unused borrowing capacity, amount   155,000  
Federal Home Loan Bank      
Line of Credit Facility [Line Items]      
FHLB maximum amount available   1,300,000  
FHLB amount outstanding at period end   $ 0