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Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Contract
Dec. 31, 2014
USD ($)
Contract
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 89 87
Pre-modification outstanding recorded investment $ 7,155 $ 6,993
Post-modification outstanding recorded investment $ 6,703 $ 5,547
Number of contracts, subsequent default | Contract 7 13
Outstanding recorded investment, subsequent default $ 552 $ 732
Commercial Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 2 3
Pre-modification outstanding recorded investment $ 406 $ 920
Post-modification outstanding recorded investment $ 357 $ 842
Commercial Loans [Member] | Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 1  
Pre-modification outstanding recorded investment $ 186  
Post-modification outstanding recorded investment $ 186  
Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 1 3
Pre-modification outstanding recorded investment $ 220 $ 920
Post-modification outstanding recorded investment $ 171 $ 842
Consumer Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 50 57
Pre-modification outstanding recorded investment $ 3,664 $ 3,356
Post-modification outstanding recorded investment $ 3,261 $ 2,617
Number of contracts, subsequent default | Contract 4 7
Outstanding recorded investment, subsequent default $ 344 $ 303
Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract   1
Pre-modification outstanding recorded investment   $ 34
Post-modification outstanding recorded investment   $ 18
Number of contracts, subsequent default | Contract 0 1
Outstanding recorded investment, subsequent default $ 0 $ 34
Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 50 56
Pre-modification outstanding recorded investment $ 3,664 $ 3,322
Post-modification outstanding recorded investment $ 3,261 $ 2,599
Number of contracts, subsequent default | Contract 4 6
Outstanding recorded investment, subsequent default $ 344 $ 269
Residential Real Estate Mortgages [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 37 27
Pre-modification outstanding recorded investment $ 3,085 $ 2,717
Post-modification outstanding recorded investment $ 3,085 $ 2,088
Number of contracts, subsequent default | Contract 3 6
Outstanding recorded investment, subsequent default $ 208 $ 429