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Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Contract
Mar. 31, 2017
USD ($)
Contract
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 16 3
Pre-modification outstanding recorded investment $ 765 $ 219
Post-modification outstanding recorded investment $ 855 $ 215
Number of contracts | Contract 23 18
Recorded Investment $ 1,574 $ 980
Commercial Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 3  
Pre-modification outstanding recorded investment $ 319  
Post-modification outstanding recorded investment $ 410  
Number of contracts | Contract 1 1
Recorded Investment $ 200 $ 145
Commercial Loans [Member] | Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 0 1
Recorded Investment $ 0 $ 145
Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 3  
Pre-modification outstanding recorded investment $ 319  
Post-modification outstanding recorded investment $ 410  
Number of contracts | Contract 1 0
Recorded Investment $ 200 $ 0
Consumer Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 8 2
Pre-modification outstanding recorded investment $ 123 $ 78
Post-modification outstanding recorded investment $ 122 $ 77
Number of contracts | Contract 14 13
Recorded Investment $ 870 $ 668
Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 0 1
Recorded Investment $ 0 $ 5
Consumer Loans [Member] | Dealer Finance [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 6  
Pre-modification outstanding recorded investment $ 82  
Post-modification outstanding recorded investment $ 81  
Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract   2
Pre-modification outstanding recorded investment   $ 78
Post-modification outstanding recorded investment   $ 77
Number of contracts | Contract 0 12
Recorded Investment $ 0 $ 663
Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 2  
Pre-modification outstanding recorded investment $ 41  
Post-modification outstanding recorded investment $ 41  
Number of contracts | Contract 14 0
Recorded Investment $ 870 $ 0
Residential Real Estate Mortgages [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts | Contract 5 1
Pre-modification outstanding recorded investment $ 323 $ 141
Post-modification outstanding recorded investment $ 323 $ 138
Number of contracts | Contract 8 4
Recorded Investment $ 504 $ 167