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Borrowed Funds and Subordinated Debentures - Subordinated Debentures (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 24, 2006
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Debt Instrument [Line Items]        
Subordinated debentures   $ 10,310   $ 10,310
Estimated fair value $ 465 $ 310   $ 310
Subordinated Debenture July 24, 2006        
Debt Instrument [Line Items]        
Subordinated debentures $ 10,000      
Interest rate at period end   1.835%   1.806%
Debt term   3 years 3 years  
LIBOR | Subordinated Debenture July 24, 2006        
Debt Instrument [Line Items]        
Debt instrument basis spread on variable rate 159.00%      
Debt term 3 months