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ACQUISITION (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2018
USD ($)
Feb. 28, 2018
$ / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Assets     $ 1,295,638 $ 1,306,799
Interest-bearing deposits     4,227 487
Liabilities     1,145,367 1,163,855
Deposits     $ 1,085,821 $ 1,110,905
Columbus First Bancorp, Inc.        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Exchange ratio per share     2  
Assets     $ 330,400  
Loans receivable, net     279,700  
Interest-bearing deposits     36,500  
Liabilities     297,700  
Deposits     $ 259,300  
Subsequent Event        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Share price (usd per share) | $ / shares   $ 18.50    
Subsequent Event | Columbus First Bancorp, Inc.        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Business combination, equivalent per share value, common stock of acquiree (usd per share) | $ / shares   $ 37.00    
Business combination consideration transferred $ 58,800      
Common stock, shares, outstanding (in shares) | shares   1,589,516    
Options, outstanding (in shares) | shares   65,724    
Exercisable at end of period (in dollars per share) | $ / shares   $ 14.06