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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
FHLB fixed-rate advances maturing in 2017, Amount $ 0 $ 14,250,000
FHLB fixed-rate advances maturing in 2017, Rate 0.00% 2.30%
FHLB fixed-rate advances maturing in 2018, Amount $ 25,500,000 $ 25,500,000
FHLB fixed-rate advances maturing in 2018, Rate 1.87% 1.87%
FHLB fixed-rate advances maturing in 2019, Amount $ 23,500,000 $ 19,500,000
FHLB fixed-rate advances maturing in 2019, Rate 1.73% 1.75%
FHLB fixed-rate advances maturing in 2020, Amount $ 20,000,000 $ 12,000,000
FHLB fixed-rate advances maturing in 2020, Rate 1.87% 1.84%
FHLB fixed-rate advances maturing in 2021, Amount $ 16,000,000 $ 3,000,000
FHLB fixed-rate advances maturing in 2021, Rate 2.01% 1.58%
Loan Payable to local bank $ 4,600,000 $ 0
Trust preferred subordinated debt 5,000,000 0
Long-term debt, Amount $ 94,600,000 $ 74,250,000
Long-term debt, Rate 2.06% 1.91%
Maximum borrowings from FHLB $ 674,680,200  
Available borrowings from FHLB $ 567,440,200  
Loan payable to local bank    
Debt Instrument [Line Items]    
Fixed rate percentage 4.50%  
Long-term debt, Rate 1.53% 0.00%
Loan payable to local bank draw period 1 year  
Period of fixed interest rate 5 years  
Trust preferred subordinated debt    
Debt Instrument [Line Items]    
Fixed rate percentage 6.39% 0.00%
Trust preferred subordinated debt issued $ 5,000,000