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ACQUISITION - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 13, 2017
USD ($)
banking_office
subsidiary
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
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_office 33        
Common shares outstanding | shares 8,380        
Shares issued/exchanged in acquisition | 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   $ 346 $ 320 $ 5,900 $ 812