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Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 42 41
Pre-modification outstanding recorded investment $ 6,115 $ 2,970
Post-modification outstanding recorded investment $ 6,116 $ 2,586
Number of TDR loans with subsequent default | Contract 57 53
Outstanding recorded investment on TDR loans with subsequent default $ 3,515 $ 4,688
Commercial Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 4  
Pre-modification outstanding recorded investment $ 3,685  
Post-modification outstanding recorded investment $ 3,620  
Number of TDR loans with subsequent default | Contract 2 3
Outstanding recorded investment on TDR loans with subsequent default $ 474 $ 1,809
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 1 1
Outstanding recorded investment on TDR loans with subsequent default $ 145 $ 169
Commercial Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Number of TDR loans with subsequent default | Contract 0 1
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 1,573
Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 3  
Pre-modification outstanding recorded investment $ 385  
Post-modification outstanding recorded investment $ 381  
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 23 28
Pre-modification outstanding recorded investment $ 976 $ 1,886
Post-modification outstanding recorded investment $ 1,022 $ 1,743
Number of TDR loans with subsequent default | Contract 36 34
Outstanding recorded investment on TDR loans with subsequent default $ 1,739 $ 1,770
Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 8  
Pre-modification outstanding recorded investment $ 145  
Post-modification outstanding recorded investment $ 143  
Number of TDR loans with subsequent default | Contract 2 0
Outstanding recorded investment on TDR loans with subsequent default $ 19 $ 0
Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 13 28
Pre-modification outstanding recorded investment $ 552 $ 1,886
Post-modification outstanding recorded investment $ 600 $ 1,743
Number of TDR loans with subsequent default | Contract 34 34
Outstanding recorded investment on TDR loans with subsequent default $ 1,720 $ 1,770
Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 2  
Pre-modification outstanding recorded investment $ 279  
Post-modification outstanding recorded investment $ 279  
Residential Real Estate Mortgages [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 15 13
Pre-modification outstanding recorded investment $ 1,454 $ 1,084
Post-modification outstanding recorded investment $ 1,474 $ 843
Number of TDR loans with subsequent default | Contract 19 16
Outstanding recorded investment on TDR loans with subsequent default $ 1,302 $ 1,109