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Borrowings - Additional Information (Details) - USD ($)
$ in Thousands
Jul. 26, 2016
Aug. 05, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Long-term line of credit     $ 86,426 $ 90,283  
Proceeds from issuance of subordinated long-term debt $ 147,350 $ 68,800      
Subordinated Debt          
Debt instrument, interest rate, stated percentage 5.00% 5.75% 5.42% 5.42% 5.42%
Debt instrument, face amount $ 150,000 $ 70,000      
Payments of debt issuance costs $ 2,600 $ 1,200      
Maximum          
Federal Home Loan Bank, advances, branch of FHLB bank, amount of advances     $ 1,540,000    
C D A R S [Member]          
Line of credit facility, maximum borrowing capacity     1,340,000    
Long-term line of credit     82,400    
I N D [Member]          
Line of credit facility, maximum borrowing capacity     700,000    
Long-term line of credit     533,100    
Loan Agreement and Related Stock Security Agreement [Member]          
Long-term line of credit     250,000    
Federal Reserve Bank of Richmond [Member]          
Line of credit facility, maximum borrowing capacity     653,000    
Federal Funds [Member]          
Debt instrument, unused borrowing capacity, amount     $ 172,500