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PENDING ACQUISITION (Details) - USD ($)
$ / shares in Units, $ in Thousands
May 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Assets of acquiree   $ 1,644,118 $ 1,558,849
Shares of common stock outstanding (in shares)   8,400,697 8,347,039
Mercersburg Financial Corporation      
Business Acquisition [Line Items]      
Consideration transferred, cash paid per acquiree shares (in usd per share) $ 40.00    
Acquisition stock exchange ratio 1.5291    
Common stock of acquiree converted to Company's common stock, percentage 85.00%    
Common stock of acquiree converted to cash, percentage 15.00%    
Mercersburg Financial Corporation      
Business Acquisition [Line Items]      
Assets of acquiree   $ 183,000  
Shares of common stock outstanding (in shares)   810,080