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FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Federal Home Loan Bank advances      
Federal Home Loan Bank advances at year end $ 335,986 $ 249,658  
FHLB Advance, interest rate     4.55%
Percentage of advances secured by mortgage loans under a blanket security agreement 183.00%    
Amount of advances contained options to convert the fixed rate advance to an adjustable rate advance $ 70,000 25,000  
FHLB Advance, amount prepaid     $ 25,000
FHLB Advance, fixed rate amount, per restructure     25,000
Advances From Federal Home Loan Banks, Restructuring Prepayment Penalty 54   $ 1,609
Maturities from January 2018 through August 2027, primarily fixed rates from 0.97% to 2.67%, averaging 1.75%      
Federal Home Loan Bank advances      
Federal Home Loan Bank advances at year end $ 335,986    
Maturities from January 2018 through August 2027, primarily fixed rates from 0.97% to 2.67%, averaging 1.75% | Minimum      
Federal Home Loan Bank advances      
FHLB Advance, interest rate 1.04%    
Maturities from January 2018 through August 2027, primarily fixed rates from 0.97% to 2.67%, averaging 1.75% | Maximum      
Federal Home Loan Bank advances      
FHLB Advance, interest rate 4.92%    
Maturities from January 2018 through August 2027, primarily fixed rates from 0.97% to 2.67%, averaging 1.75% | Average      
Federal Home Loan Bank advances      
FHLB Advance, interest rate 1.69%    
Maturities from June 2017 through September 2026, primarily fixed rates from 0.58% to 4.80%, averaging 1.53%      
Federal Home Loan Bank advances      
Federal Home Loan Bank advances at year end   $ 249,658  
Maturities from June 2017 through September 2026, primarily fixed rates from 0.58% to 4.80%, averaging 1.53% | Minimum      
Federal Home Loan Bank advances      
FHLB Advance, interest rate   0.97%  
Maturities from June 2017 through September 2026, primarily fixed rates from 0.58% to 4.80%, averaging 1.53% | Maximum      
Federal Home Loan Bank advances      
FHLB Advance, interest rate   2.67%  
Maturities from June 2017 through September 2026, primarily fixed rates from 0.58% to 4.80%, averaging 1.53% | Average      
Federal Home Loan Bank advances      
FHLB Advance, interest rate   1.75%