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PLEDGED ASSETS (Tables)
3 Months Ended
Mar. 31, 2018
Guarantees [Abstract]  
Securities and loans pledged to secure public and trust deposits, securities sold under agreements to repurchase, FHLBB advances and credit facilities available
(in thousands)    March 31, 2018      December 31, 2017  
Securities available-for-sale (at fair value)  $63,562   $67,377 
Loans receivable   206,225    204,354 
Total pledged assets  $269,787   $271,731