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Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
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) 19,736 $ 28,874
Unpaid principal balance (legal) 26,355 31,582
Related allowance 30 1,517
Originated Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 19,658 21,912
Unpaid principal balance (legal) 26,272 24,321
Originated Loans [Member] | Commercial Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 4,777 7,313
Unpaid principal balance (legal) 7,709 7,970
With an allowance recorded [Abstract]    
Recorded investment balance (book) 78 5,757
Unpaid principal balance (legal) 83 5,940
Total [Abstract]    
Related allowance 30 826
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 0 1,278
Unpaid principal balance (legal) 251 1,697
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 2,239 3,816
Unpaid principal balance (legal) 3,996 3,841
With an allowance recorded [Abstract]    
Recorded investment balance (book) 78 5,553
Unpaid principal balance (legal) 83 5,736
Total [Abstract]    
Related allowance 30 735
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 100 130
Unpaid principal balance (legal) 112 137
With an allowance recorded [Abstract]    
Recorded investment balance (book) 0 49
Unpaid principal balance (legal) 0 49
Total [Abstract]    
Related allowance 0 37
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 1,491 1,434
Unpaid principal balance (legal) 1,663 1,567
With an allowance recorded [Abstract]    
Recorded investment balance (book) 0 155
Unpaid principal balance (legal) 0 155
Total [Abstract]    
Related allowance 0 54
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 947 655
Unpaid principal balance (legal) 1,687 728
Originated Loans [Member] | Consumer Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,307 8,488
Unpaid principal balance (legal) 10,228 9,445
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 36 5
Unpaid principal balance (legal) 47 16
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,153 8,483
Unpaid principal balance (legal) 10,063 9,429
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 118 0
Unpaid principal balance (legal) 118 0
Originated Loans [Member] | Residential Real Estate Mortgages [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 6,574 6,111
Unpaid principal balance (legal) 8,335 6,906
Acquired Loans [Member] | Commercial Loans [Member]    
With an allowance recorded [Abstract]    
Recorded investment balance (book) 0 1,205
Unpaid principal balance (legal) 0 1,321
Total [Abstract]    
Related allowance 0 691
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
With an allowance recorded [Abstract]    
Recorded investment balance (book) 0 1,205
Unpaid principal balance (legal) 0 1,321
Total [Abstract]    
Related allowance $ 0 $ 691