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Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Contract
Jun. 30, 2016
USD ($)
Contract
Jun. 30, 2017
USD ($)
Contract
Jun. 30, 2016
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 11 4 16 20
Pre-modification outstanding recorded investment $ 4,213 $ 226 $ 4,522 $ 1,792
Post-modification outstanding recorded investment $ 4,147 $ 224 $ 4,469 $ 1,595
Number of TDR loans with subsequent default | Contract 19 17 34 25
Outstanding recorded investment on TDR loans with subsequent default $ 1,183 $ 1,251 $ 2,013 $ 1,838
Commercial Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 2   2  
Pre-modification outstanding recorded investment $ 3,637   $ 3,637  
Post-modification outstanding recorded investment $ 3,572   $ 3,572  
Number of TDR loans with subsequent default | Contract 1 1 2 1
Outstanding recorded investment on TDR loans with subsequent default $ 329 $ 67 $ 474 $ 67
Commercial Loans [Member] | Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1   1  
Pre-modification outstanding recorded investment $ 3,300   $ 3,300  
Post-modification outstanding recorded investment $ 3,239   $ 3,239  
Number of TDR loans with subsequent default | Contract     1 0
Outstanding recorded investment on TDR loans with subsequent default     $ 145 $ 0
Commercial Loans [Member] | Business Banking [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1   1  
Pre-modification outstanding recorded investment $ 337   $ 337  
Post-modification outstanding recorded investment $ 333   $ 333  
Number of TDR loans with subsequent default | Contract 1 1 1 1
Outstanding recorded investment on TDR loans with subsequent default $ 329 $ 67 $ 329 $ 67
Consumer Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 5 2 8 14
Pre-modification outstanding recorded investment $ 230 $ 74 $ 337 $ 1,109
Post-modification outstanding recorded investment $ 229 $ 73 $ 343 $ 1,017
Number of TDR loans with subsequent default | Contract 14 10 24 14
Outstanding recorded investment on TDR loans with subsequent default $ 603 $ 520 $ 1,120 $ 898
Consumer Loans [Member] | Indirect [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 3   3  
Pre-modification outstanding recorded investment $ 32   $ 32  
Post-modification outstanding recorded investment $ 31   $ 31  
Number of TDR loans with subsequent default | Contract 1 0 2 0
Outstanding recorded investment on TDR loans with subsequent default $ 14 $ 0 $ 19 $ 0
Consumer Loans [Member] | Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1 2 4 14
Pre-modification outstanding recorded investment $ 78 $ 74 $ 185 $ 1,109
Post-modification outstanding recorded investment $ 78 $ 73 $ 192 $ 1,017
Number of TDR loans with subsequent default | Contract 13 10 22 14
Outstanding recorded investment on TDR loans with subsequent default $ 589 $ 520 $ 1,101 $ 898
Consumer Loans [Member] | Direct [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1   1  
Pre-modification outstanding recorded investment $ 120   $ 120  
Post-modification outstanding recorded investment $ 120   $ 120  
Residential Real Estate Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 4 2 6 6
Pre-modification outstanding recorded investment $ 346 $ 152 $ 548 $ 683
Post-modification outstanding recorded investment $ 346 $ 151 $ 554 $ 578
Number of TDR loans with subsequent default | Contract 4 6 8 10
Outstanding recorded investment on TDR loans with subsequent default $ 251 $ 664 $ 419 $ 873