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BORROWINGS (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
FHLB fixed-rate advances maturing within one year of balance sheet date, Amount $ 23,500,000 $ 25,500,000
FHLB fixed-rate advances maturing within one year of balance sheet date, Rate 1.73% 1.87%
FHLB fixed-rate advances maturing from one to two years of balance sheet date, Amount $ 20,000,000 $ 23,500,000
FHLB fixed-rate advances maturing from one to two years from balance sheet date, Rate 1.87% 1.73%
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Amount $ 22,716,000 $ 20,000,000
FHLB fixed-rate advances maturing from two to three years from balance sheet date, Rate 2.10% 1.87%
FHLB fixed-rate advances maturing from three to four years from balance sheet date, Amount $ 9,000,000 $ 16,000,000
FHLB fixed-rate advances maturing from three to four years from balance sheet date, Rate 2.70% 2.01%
Long-term debt $ 83,516,000 $ 94,600,000
Long-term debt, Rate 2.47% 2.06%
Maximum borrowings from FHLB $ 685,765,000  
Available borrowings from FHLB $ 588,734,000  
Loan payable to local bank    
Debt Instrument [Line Items]    
Fixed rate percentage   1.53%
Trust preferred subordinated debt    
Debt Instrument [Line Items]    
Fixed rate percentage 6.39% 6.39%
Long-term debt $ 5,000,000 $ 5,000,000
Trust preferred subordinated debt issued $ 5,000,000  
Loan payable to local bank, 4.5% | Loan payable to local bank    
Debt Instrument [Line Items]    
Fixed rate percentage 4.50%  
Long-term debt $ 2,300,000 4,600,000
Period of fixed interest rate 5 years  
Loan payable to local bank, 5.25% | Loan payable to local bank    
Debt Instrument [Line Items]    
Long-term debt $ 1,000,000 $ 0
Wall Street Journal Prime Rate | Loan payable to local bank, 5.25% | Loan payable to local bank    
Debt Instrument [Line Items]    
Basis spread on prime rate, percentage 0.25%  
Effective rate, percentage 5.25% 0.00%