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Loans, Allowance for Loan Losses and Credit Quality (Purchased Credit Impaired Loans - Outstanding/Carrying balances) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Outstanding balance $ 21,481 $ 23,199