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PLEDGED ASSETS (Tables)
12 Months Ended
Dec. 31, 2017
Guarantees [Abstract]  
Securities and loans pledged to secure public and trust deposits, securities sold under agreements to repurchase, FHLBB advances and credit facilities available
December 31, (in thousands)    2017      2016  
Securities available-for-sale (at fair value)  $67,377   $63,833 
Loans receivable (at book value)   204,354    137,117 
Total pledged assets  $271,731   $200,950