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Borrowed Funds and Subordinated Debentures - Narrative (Details)
12 Months Ended
Dec. 09, 2019
USD ($)
Aug. 16, 2017
USD ($)
Jul. 05, 2017
USD ($)
Dec. 31, 2019
USD ($)
loan
Aug. 22, 2019
USD ($)
Dec. 31, 2018
USD ($)
loan
Debt Instrument [Line Items]            
Interest rate 1.755% 1.243%     1.81%  
Subordinated Debentures Subject to Mandatory Redemption            
Debt Instrument [Line Items]            
Maximum period to defer interest payment without default       5 years    
FHLB Overnight Line of Credit            
Debt Instrument [Line Items]            
FHLB advances, maximum amount available       $ 193,000,000   $ 160,000,000
Interest rate       1.81%    
1.810% Due August 22, 2024 | FHLB Advance            
Debt Instrument [Line Items]            
FHLB amount of advances       $ 40,000,000 $ 40,000,000  
Two 20 Million Advances | FHLB Advance            
Debt Instrument [Line Items]            
Number of FHLB advances | loan       2    
FHLB amount of advances       $ 20,000,000    
Six 10 Million Advances | FHLB Advance            
Debt Instrument [Line Items]            
Number of FHLB advances | loan       1   1
FHLB amount of advances       $ 10,000,000   $ 10,000,000.0
One 20 Million Advance | FHLB Advance            
Debt Instrument [Line Items]            
Number of FHLB advances | loan           2
FHLB amount of advances           $ 20,000,000
1.810% Due January 2, 2020 | FHLB Overnight Line of Credit            
Debt Instrument [Line Items]            
FHLB advances, maximum amount available       $ 193,000,000    
1.730% Advance Due June 7, 2018 | FHLB Advance            
Debt Instrument [Line Items]            
FHLB amount of advances $ 20,000,000          
1.730% Advance Due June 7, 2018 | LIBOR | FHLB Advance            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate 2.50%          
1.103% Advance Due February 16, 2018 | FHLB Advance            
Debt Instrument [Line Items]            
FHLB amount of advances   $ 10,000,000        
1.103% Advance Due February 16, 2018 | LIBOR | FHLB Advance            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate   14.00%        
1.048% Advance Due January 5, 2018 | FHLB Advance            
Debt Instrument [Line Items]            
FHLB amount of advances     $ 20,000,000      
Interest rate     1.198%      
1.048% Advance Due January 5, 2018 | LIBOR | FHLB Advance            
Debt Instrument [Line Items]            
Debt instrument basis spread on variable rate     15000.00%