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Goodwill, Intangible Assets, and Servicing Assets - Servicing Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]            
Balance at beginning of period $ 12,084 $ 12,692 $ 14,847 $ 12,692 $ 16,417  
Additions through originations of servicing assets 737   759 1,329 1,136  
Amortization (1,255)   (1,442) (2,455) (3,389)  
Balance at end of period 11,566 $ 12,084 $ 14,164 11,566 $ 14,164  
Principal balances of loans serviced for other institutions $ 1,180,000     $ 1,180,000   $ 1,230,000
SBA Servicing Assets: Weighted-average discount rate   9.93%   11.72%    
SBA Servicing Assets: Constant prepayment rate   14.40%   14.23%    
Mortgage Servicing Assets: Weighted-average discount rate   8.26%   8.51%    
Mortgage Servicing Assets: Constant prepayment rate   8.63%   9.02%