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Borrowed Funds and Subordinated Debentures - Subordinated Debentures (Details) - USD ($)
Jul. 24, 2006
Dec. 31, 2019
Dec. 09, 2019
Aug. 22, 2019
Jul. 05, 2019
Dec. 31, 2018
Aug. 16, 2017
Debt Instrument [Line Items]              
Subordinated debentures   $ 10,310,000       $ 10,310,000  
Interest rate     1.755% 1.81%     1.243%
Estimated fair value $ 465,000 $ 310,000       $ 310,000  
Subordinated Debenture July 24, 2006              
Debt Instrument [Line Items]              
Subordinated debentures $ 10,000,000.0            
Interest rate at period end   3.518%       4.414%  
Interest rate   2.475%          
Subordinated Debenture July 5, 2019              
Debt Instrument [Line Items]              
Interest rate         3.435%    
LIBOR | Subordinated Debenture July 24, 2006              
Debt Instrument [Line Items]              
Debt instrument basis spread on variable rate 159.00%