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SBA Loan Servicing Activities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Servicing Asset at Amortized Cost [Line Items]          
Principal balance of SBA loans, excluding PPP loans $ 314,015   $ 314,015   $ 253,330
Principal balance of SBA loans, excluding PPP loans, guaranteed portion 184,119   184,119   110,196
Unpaid principal balances of SBA loans serviced for others 443,764   $ 443,764   $ 524,910
Servicing assets, weighted average discount rate (in percentage)     12.12%   11.75%
Servicing assets, weighted average prepayment speed (in percentage)     10.52%   10.34%
SBA Loan          
Servicing Asset at Amortized Cost [Line Items]          
Gain on sale of loans (357) $ 0 $ (357) $ 1,732  
SBA Loan | Significant Unobservable Inputs (Level 3) | Fair Value          
Servicing Asset at Amortized Cost [Line Items]          
Servicing asset rights at fair value 7,615   7,615   $ 9,709
PPP Loans          
Servicing Asset at Amortized Cost [Line Items]          
Gain on sale of loans $ 19   $ 13,817