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Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($)
$ in Thousands
Jun. 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) 23,964 $ 28,874
Unpaid principal balance (legal) 26,056 31,582
Related allowance 461 1,517
Originated Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 23,115 21,912
Unpaid principal balance (legal) 25,194 24,321
Originated Loans [Member] | Commercial Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,472 7,313
Unpaid principal balance (legal) 8,899 7,970
With an allowance recorded [Abstract]    
Recorded investment balance (book) 849 5,757
Unpaid principal balance (legal) 862 5,940
Total [Abstract]    
Related allowance 461 826
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 3,303 1,278
Unpaid principal balance (legal) 3,436 1,697
With an allowance recorded [Abstract]    
Recorded investment balance (book) 695 0
Unpaid principal balance (legal) 700 0
Total [Abstract]    
Related allowance 350 0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 2,614 3,816
Unpaid principal balance (legal) 2,647 3,841
With an allowance recorded [Abstract]    
Recorded investment balance (book) 79 5,553
Unpaid principal balance (legal) 83 5,736
Total [Abstract]    
Related allowance 50 735
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 115 130
Unpaid principal balance (legal) 125 137
With an allowance recorded [Abstract]    
Recorded investment balance (book) 29 49
Unpaid principal balance (legal) 31 49
Total [Abstract]    
Related allowance 30 37
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 1,476 1,434
Unpaid principal balance (legal) 1,635 1,567
With an allowance recorded [Abstract]    
Recorded investment balance (book) 46 155
Unpaid principal balance (legal) 48 155
Total [Abstract]    
Related allowance 31 54
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 964 655
Unpaid principal balance (legal) 1,056 728
Originated Loans [Member] | Consumer Loans [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,214 8,488
Unpaid principal balance (legal) 9,050 9,445
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 31 5
Unpaid principal balance (legal) 31 16
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 8,064 8,483
Unpaid principal balance (legal) 8,900 9,429
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 119 0
Unpaid principal balance (legal) 119 0
Originated Loans [Member] | Residential Real Estate Mortgages [Member]    
With no related allowance recorded [Abstract]    
Recorded investment balance (book) 6,429 6,111
Unpaid principal balance (legal) 7,245 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