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Allowance for Loan Losses and Credit Quality of Loans, Additional Information on Loans Specifically Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan Losses and Credit Quality of Loans [Abstract]    
Threshold balance for classified loans to be evaluated individually for impairment $ 800  
Total [Abstract]    
Recorded investment balance (book) 28,874 $ 27,168
Unpaid principal balance (legal) 31,582 31,665
Related allowance 1,517 2,005
Originated Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 21,912 21,296
Unpaid principal balance (legal) 24,321 23,828
Originated Loans [Member] | Commercial Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 7,313 7,586
Unpaid principal balance (legal) 7,970 8,606
With an allowance recorded [Abstract]    
Recorded investment balance (book) 5,757 4,667
Unpaid principal balance (legal) 5,940 6,516
Total [Abstract]    
Related allowance 826 1,270
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 1,278 2,244
Unpaid principal balance (legal) 1,697 2,490
With an allowance recorded [Abstract]    
Recorded investment balance (book) 0 457
Unpaid principal balance (legal) 0 457
Total [Abstract]    
Related allowance 0 300
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 3,816 3,165
Unpaid principal balance (legal) 3,841 3,175
With an allowance recorded [Abstract]    
Recorded investment balance (book) 5,553 4,210
Unpaid principal balance (legal) 5,736 6,059
Total [Abstract]    
Related allowance 735 970
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 130 576
Unpaid principal balance (legal) 137 1,164
With an allowance recorded [Abstract]    
Recorded investment balance (book) 49 0
Unpaid principal balance (legal) 49 0
Total [Abstract]    
Related allowance 37 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 1,434 618
Unpaid principal balance (legal) 1,567 744
With an allowance recorded [Abstract]    
Recorded investment balance (book) 155 0
Unpaid principal balance (legal) 155 0
Total [Abstract]    
Related allowance 54 0
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 655 983
Unpaid principal balance (legal) 728 1,033
Originated Loans [Member] | Consumer Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,488 7,693
Unpaid principal balance (legal) 9,445 8,595
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 5 12
Unpaid principal balance (legal) 16 21
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,483 7,681
Unpaid principal balance (legal) 9,429 8,574
Originated Loans [Member] | Residential Real Estate Mortgages [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 6,111 6,017
Unpaid principal balance (legal) 6,906 6,627
Acquired Loans [Member] | Commercial [Member]    
With an allowance recorded [Abstract]    
Recorded investment balance (book) 1,205 1,205
Unpaid principal balance (legal) 1,321 1,321
Total [Abstract]    
Related allowance 691 735
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
With an allowance recorded [Abstract]    
Recorded investment balance (book) 1,205 1,205
Unpaid principal balance (legal) 1,321 1,321
Total [Abstract]    
Related allowance $ 691 $ 735