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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, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 6 14 23 34
Pre-modification outstanding recorded investment $ 714 $ 810 $ 5,235 $ 2,604
Post-modification outstanding recorded investment $ 747 $ 682 $ 5,211 $ 2,259
Number of TDR loans with subsequent default | Contract 19 26 46 47
Outstanding recorded investment on TDR loans with subsequent default $ 1,181 $ 1,501 $ 2,691 $ 2,945
Commercial Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract     2  
Pre-modification outstanding recorded investment     $ 3,637  
Post-modification outstanding recorded investment     $ 3,572  
Number of TDR loans with subsequent default | Contract 0 1 2 2
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 169 $ 474 $ 236
Commercial Loans [Member] | Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract     1  
Pre-modification outstanding recorded investment     $ 3,300  
Post-modification outstanding recorded investment     $ 3,239  
Number of TDR loans with subsequent default | Contract 0 1 1 1
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 169 $ 145 $ 169
Commercial Loans [Member] | Business Banking [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract     1  
Pre-modification outstanding recorded investment     $ 337  
Post-modification outstanding recorded investment     $ 333  
Number of TDR loans with subsequent default | Contract     1 1
Outstanding recorded investment on TDR loans with subsequent default     $ 329 $ 67
Consumer Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 5 10 13 24
Pre-modification outstanding recorded investment $ 196 $ 580 $ 532 $ 1,690
Post-modification outstanding recorded investment $ 229 $ 556 $ 571 $ 1,567
Number of TDR loans with subsequent default | Contract 13 17 32 30
Outstanding recorded investment on TDR loans with subsequent default $ 635 $ 847 $ 1,400 $ 1,634
Consumer Loans [Member] | Indirect [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1   4  
Pre-modification outstanding recorded investment $ 7   $ 39  
Post-modification outstanding recorded investment $ 7   $ 37  
Number of TDR loans with subsequent default | Contract 1 0 2 0
Outstanding recorded investment on TDR loans with subsequent default $ 13 $ 0 $ 19 $ 0
Consumer Loans [Member] | Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 4 10 8 24
Pre-modification outstanding recorded investment $ 189 $ 580 $ 373 $ 1,690
Post-modification outstanding recorded investment $ 222 $ 556 $ 414 $ 1,567
Number of TDR loans with subsequent default | Contract 12 17 30 30
Outstanding recorded investment on TDR loans with subsequent default $ 622 $ 847 $ 1,381 $ 1,634
Consumer Loans [Member] | Direct [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract     1  
Pre-modification outstanding recorded investment     $ 120  
Post-modification outstanding recorded investment     $ 120  
Residential Real Estate Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1 4 8 10
Pre-modification outstanding recorded investment $ 518 $ 230 $ 1,066 $ 914
Post-modification outstanding recorded investment $ 518 $ 126 $ 1,068 $ 692
Number of TDR loans with subsequent default | Contract 6 8 12 15
Outstanding recorded investment on TDR loans with subsequent default $ 546 $ 485 $ 817 $ 1,075