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Borrowings (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Outstanding Borrowings [Abstract]      
Long-term Federal Home Loan Bank Advances   $ 88,500,000 $ 103,500,000
Commercial Note Payable [Member]      
Debt Instrument [Line Items]      
Amount of loan borrowed $ 3,500,000    
Term of loan 8 years    
Period of fixed interest rate 36 months    
Debt instrument fixed rate 2.75%    
Amortization period, FHLB Rate 5 years    
Quarterly principal payment $ 175,000    
Debt instrument, prepayment penalty rate 1.00%    
Outstanding Borrowings [Abstract]      
Long-term Federal Home Loan Bank Advances   $ 3,500,000 $ 3,500,000
Weighted-average interest rate at year-end   4.25% 4.25%
Maximum outstanding at any month-end   $ 3,500,000 $ 3,500,000
Average outstanding   $ 3,500,000 $ 3,500,000
Weighted-average interest rate during the year   5.04% 4.37%
Commercial Note Payable [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Additional principal payment $ 875,000    
Commercial Note Payable [Member] | Year One and Two [Member]      
Debt Instrument [Line Items]      
Debt instrument, prepayment penalty on the floating rate 2.00%    
Commercial Note Payable [Member] | From Year Three to Five [Member]      
Debt Instrument [Line Items]      
Debt instrument, prepayment penalty on the floating rate 1.00%    
Commercial Note Payable [Member] | Wall Street Journal Prime plus [Member]      
Debt Instrument [Line Items]      
Debt instrument variable rate 0.50%    
FHLB of Atlanta [Member]      
Debt Instrument [Line Items]      
Collateral pledge percentage to total assets for all borrowings   30.00%  
Credit availability under the FHLB   $ 239,300,000  
Outstanding Borrowings [Abstract]      
Long-term Federal Home Loan Bank Advances   $ 85,000,000 $ 100,000,000
Weighted-average interest rate at year-end   2.40% 3.30%
Maximum outstanding at any month-end   $ 169,950,000 $ 125,000,000
Average outstanding   $ 91,456,000 $ 117,418,000
Weighted-average interest rate during the year   3.03% 3.10%
Interest rate on maturities of long-term advances [Abstract]      
2022 Maturity, Rate   2.19%  
Maturities of long-term advances [Abstract]      
2018 Maturity, Amount   $ 15,000,000  
2019 Maturity, Amount   35,000,000  
2020 Maturity, Amount   25,000,000  
2022 Maturity, Amount   10,000,000  
Long-term advances Maturity, Amount   85,000,000  
Fiscal Year Maturity Period [Abstract]      
Loans pledged as collateral   $ 196,900,000  
FHLB of Atlanta [Member] | Minimum [Member]      
Interest rate on maturities of long-term advances [Abstract]      
2018 Maturity, Rate   2.58%  
2019 Maturity, Rate   1.55%  
2020 Maturity, Rate   1.75%  
FHLB of Atlanta [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Long-term borrowings maturities period   15 years  
Interest rate on maturities of long-term advances [Abstract]      
2018 Maturity, Rate   3.43%  
2019 Maturity, Rate   4.00%  
2020 Maturity, Rate   1.92%