Loans, Allowance for Loan Losses and Credit Quality (Post-Modification balance of TDRs Listed by Type of Modifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Post modification balance of Troubled Debt Restructuring
EXTENDED MATURITY	$ 445	$ 1,207
COURT ORDERED CONCESSION	242	90
TOTAL	$ 687	$ 1,297