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ACQUISITION - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 13, 2017
USD ($)
banking_office
subsidiary
$ / shares
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Pro forma estimated tax rate   37.57%  
Lake Sunapee      
Business Acquisition [Line Items]      
Number of subsidiaries | subsidiary 1    
Number of full service branches acquired (banking offices) | banking_office 33    
Common shares outstanding (in shares) | shares 8,380    
Shares issued/exchanged in acquisition (in shares) | shares 4,160    
Fixed exchange ratio 0.4970    
Acquired price per share (in dollars per share) | $ / shares $ 43.69    
Total consideration paid $ 181,920 $ 181,946  
Cash paid for fractional shares $ 27    
Acquisition integration related costs   $ 6,100 $ 2,700