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Servicing Asset - Unpaid principal balance (Details) - Loan servicing - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]    
Loans serviced for others $ 213,378 $ 165,961
SBA guaranteed loans    
Servicing Assets at Fair Value [Line Items]    
Loans serviced for others $ 213,378 $ 165,961