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MERGERS AND ACQUISITIONS (Tables)
12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Accretable yield for ASC 310-30 acquired loan portfolio
  (In thousands)    2017      2016  
Balance at beginning of period  $1,190   $1,901 
Acquisitions        
Accretion   (541)   (980)
Disposals   (405)   (342)
Reclassification from non-accretable to accretable   273    611 
Balance at end of period  $517   $1,190