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Borrowed Funds and Subordinated Debentures - Narrative (Details)
Dec. 07, 2017
USD ($)
Aug. 16, 2017
USD ($)
Jul. 05, 2017
USD ($)
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Debt Instrument [Line Items]          
Interest rate 1.73% 1.103%      
Repurchase agreements:          
Debt Instrument [Line Items]          
Interest rate         3.67%
Repurchase agreements         $ 15,000,000
FHLB Overnight Line of Credit          
Debt Instrument [Line Items]          
FHLB advances, maximum amount available       $ 160,000,000 $ 170,000,000
Interest rate       2.60%  
Six 10 Million Advances | FHLB Advance          
Debt Instrument [Line Items]          
Number of FHLB advances | loan       1  
FHLB amount of advances       $ 10,000,000  
Two 20 Million Advances | FHLB Advance          
Debt Instrument [Line Items]          
Number of FHLB advances | loan       2  
FHLB amount of advances       $ 20,000,000  
Five 10 Million Advances | FHLB Advance          
Debt Instrument [Line Items]          
Number of FHLB advances | loan         5
FHLB amount of advances         $ 10,000,000
One 20 Million Advance | FHLB Advance          
Debt Instrument [Line Items]          
Number of FHLB advances | loan         2
FHLB amount of advances         $ 20,000,000
1.730 Percent Advance Due June 7, 2018 | FHLB Advance          
Debt Instrument [Line Items]          
FHLB amount of advances $ 20,000,000.0        
1.730 Percent Advance Due June 7, 2018 | LIBOR | FHLB Advance          
Debt Instrument [Line Items]          
Debt instrument basis spread on variable rate 0.05%        
1.103 Percent Advance Due February 16, 2018 | FHLB Advance          
Debt Instrument [Line Items]          
FHLB amount of advances   $ 10,000,000.0      
1.103 Percent Advance Due February 16, 2018 | LIBOR | FHLB Advance          
Debt Instrument [Line Items]          
Debt instrument basis spread on variable rate   0.085%      
1.048 Percent Advance Due January 5, 2018 | FHLB Advance          
Debt Instrument [Line Items]          
FHLB amount of advances     $ 20,000,000    
Interest rate     1.048%    
1.048 Percent Advance Due January 5, 2018 | LIBOR | FHLB Advance          
Debt Instrument [Line Items]          
Debt instrument basis spread on variable rate     0.01%