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Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Period of sustained repayment performance for nonperforming TDRs to be returned to performing status     6 months  
Number of contracts | Contract 14 28 34 77
Pre-modification outstanding recorded investment $ 810 $ 2,156 $ 2,604 $ 7,857
Post-modification outstanding recorded investment $ 682 $ 1,993 $ 2,259 $ 6,230
Number of TDR loans with subsequent default | Contract 3 2 4 6
Outstanding recorded investment on TDR loans with subsequent default $ 242 $ 174 $ 417 $ 517
Commercial Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract       2
Pre-modification outstanding recorded investment       $ 1,470
Post-modification outstanding recorded investment       $ 359
Commercial Loans [Member] | Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract       1
Pre-modification outstanding recorded investment       $ 1,250
Post-modification outstanding recorded investment       $ 186
Commercial Loans [Member] | Business Banking [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract       1
Pre-modification outstanding recorded investment       $ 220
Post-modification outstanding recorded investment       $ 173
Consumer Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 10 12 24 43
Pre-modification outstanding recorded investment $ 580 $ 863 $ 1,690 $ 3,321
Post-modification outstanding recorded investment $ 556 $ 802 $ 1,567 $ 3,017
Consumer Loans [Member] | Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 10 12 24 43
Pre-modification outstanding recorded investment $ 580 $ 863 $ 1,690 $ 3,321
Post-modification outstanding recorded investment $ 556 $ 802 $ 1,567 $ 3,017
Number of TDR loans with subsequent default | Contract 2 0 2 4
Outstanding recorded investment on TDR loans with subsequent default $ 121 $ 0 $ 121 $ 343
Residential Real Estate Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 4 16 10 32
Pre-modification outstanding recorded investment $ 230 $ 1,293 $ 914 $ 3,066
Post-modification outstanding recorded investment $ 126 $ 1,191 $ 692 $ 2,854
Number of TDR loans with subsequent default | Contract 1 2 2 2
Outstanding recorded investment on TDR loans with subsequent default $ 121 $ 174 $ 296 $ 174