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Subordinated Debt (Details) - USD ($)
May 26, 2017
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Principal amount $ 40,000,000    
Fixed interest rate (as a percent) 5.25%    
Subordinated debt, net of issuance costs   $ 39,878,000 $ 39,740,000
Debt Issuance Costs   $ 122,000  
LIBOR      
Debt Instrument [Line Items]      
Rate of interest added to base rate 336.50%