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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, 2015
USD ($)
Contract
Jun. 30, 2014
USD ($)
Contract
Jun. 30, 2015
USD ($)
Contract
Jun. 30, 2014
USD ($)
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 20 28 48 63
Pre-modification outstanding recorded investment $ 2,796 $ 2,787 $ 4,645 $ 5,559
Post-modification outstanding recorded investment $ 3,239 $ 2,787 $ 5,099 $ 5,529
Number of TDR loans with subsequent default | Contract 0 3 4 8
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 343 $ 233 $ 605
Commercial Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 2 2 2 2
Pre-modification outstanding recorded investment $ 1,355 $ 570 $ 1,355 $ 570
Post-modification outstanding recorded investment $ 1,341 $ 570 $ 1,341 $ 570
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1   1  
Pre-modification outstanding recorded investment $ 1,165   $ 1,165  
Post-modification outstanding recorded investment $ 1,165   $ 1,165  
Small Business [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 1 2 1 2
Pre-modification outstanding recorded investment $ 190 $ 570 $ 190 $ 570
Post-modification outstanding recorded investment $ 176 $ 570 $ 176 $ 570
Consumer Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 12 23 31 45
Pre-modification outstanding recorded investment $ 1,071 $ 1,785 $ 2,218 $ 3,148
Post-modification outstanding recorded investment $ 1,128 $ 1,785 $ 2,236 $ 3,118
Number of TDR loans with subsequent default | Contract 0 3 4 7
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 343 $ 233 $ 535
Indirect [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract   2   2
Pre-modification outstanding recorded investment   $ 69   $ 69
Post-modification outstanding recorded investment   $ 69   $ 39
Home Equity [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 12 6 27 8
Pre-modification outstanding recorded investment $ 1,071 $ 503 $ 2,112 $ 561
Post-modification outstanding recorded investment $ 1,128 $ 503 $ 2,132 $ 561
Number of TDR loans with subsequent default | Contract 0 2 4 2
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 300 $ 233 $ 300
Direct [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract   15 4 35
Pre-modification outstanding recorded investment   $ 1,213 $ 106 $ 2,518
Post-modification outstanding recorded investment   $ 1,213 $ 104 $ 2,518
Number of TDR loans with subsequent default | Contract 0 1 0 5
Outstanding recorded investment on TDR loans with subsequent default $ 0 $ 43 $ 0 $ 235
Residential Real Estate Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of contracts | Contract 6 3 15 16
Pre-modification outstanding recorded investment $ 370 $ 432 $ 1,072 $ 1,841
Post-modification outstanding recorded investment $ 770 $ 432 $ 1,522 $ 1,841
Number of TDR loans with subsequent default | Contract     0 1
Outstanding recorded investment on TDR loans with subsequent default     $ 0 $ 70