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Long-Term Debt (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Long-Term Debt    
Face Value $ 63,010 $ 63,010
Carrying Amount 58,963 58,735
Subordinated notes payable    
Long-Term Debt    
Face Value 50,000 50,000
Carrying Amount $ 50,000 $ 49,688
Fixed interest rate 3.50%  
Period End Interest Rate   4.36%
Subordinated notes payable | Three - month LIBOR    
Long-Term Debt    
Interest Rate   4.12%
Junior subordinated debenture (Trust I)    
Long-Term Debt    
Face Value $ 4,124 $ 4,124
Carrying Amount $ 3,481 $ 3,447
Period End Interest Rate 3.23% 3.35%
Junior subordinated debenture (Trust I) | Three - month LIBOR    
Long-Term Debt    
Interest Rate 3.10% 3.10%
Junior subordinated debenture (Trust II)    
Long-Term Debt    
Face Value $ 6,186 $ 6,186
Carrying Amount $ 5,221 $ 5,170
Period End Interest Rate 1.92% 2.02%
Junior subordinated debenture (Trust II) | Three - month LIBOR    
Long-Term Debt    
Interest Rate 1.80% 1.80%
Finance lease liability    
Long-Term Debt    
Face Value $ 2,700 $ 2,700
Carrying Amount $ 261 $ 430
Fixed interest rate 7.81% 7.81%