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PLEDGED ASSETS (Tables)
9 Months Ended
Sep. 30, 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
(in thousands)    September 30, 2017      December 31, 2016  
Securities available-for-sale (at fair value)  $69,795   $63,833 
Loans receivable (at book value)   190,868    203,145 
Total pledged assets  $260,663   $266,978