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Borrowings, Line of Credit and Subordinated Debt - Subordinated debt (Details) - Subordinated Debt [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 28, 2018
Debt Instrument [Line Items]        
Principal amount       $ 40,000
Interest rate       5.625%
Debt issuance costs $ 612 $ 612 $ 654 $ 842
Amortization expense of debt issuance costs $ 21 $ 42    
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent)     2.55%