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Borrowed Funds - Narrative (Details) - USD ($)
12 Months Ended
Sep. 27, 2016
Dec. 31, 2018
Dec. 31, 2017
Short-term Debt [Line Items]      
Line of credit maximum borrowing capacity $ 50,000,000.0    
Line of credit unused facility fee 0.35%    
Line of credit amount outstanding   $ 0 $ 0
One-Month LIBOR Plus 1.75%      
Short-term Debt [Line Items]      
Line of credit interest rate spread 1.75%    
FHLB Advances      
Short-term Debt [Line Items]      
FHLB maturity date range, start   Jan. 02, 2019  
FHLB maturity date range, end   Mar. 01, 2019  
FHLB Advances | Minimum      
Short-term Debt [Line Items]      
FHLB fixed interest rate   2.51%  
FHLB Advances | Maximum      
Short-term Debt [Line Items]      
FHLB fixed interest rate   2.58%