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Allowance for Loan Losses and Credit Quality of Loans, Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Allowance for Loan Losses and Credit Quality of Loans [Abstract]      
Minimum balance for classified loans to be evaluated individually for impairment $ 500    
With an allowance recorded [Abstract]      
Recorded investment balance (book) 35,372   $ 27,168
Unpaid principal balance (legal) 39,422   31,665
Related allowance 2,970   2,005
Average recorded investment 33,374 $ 33,026  
Interest income recognized 324 183  
Originated Loans [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 26,323   21,296
Unpaid principal balance (legal) 28,409   23,828
With an allowance recorded [Abstract]      
Average recorded investment 32,169 23,007  
Interest income recognized 324 183  
Originated Loans [Member] | Commercial Loans [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 11,847   7,586
Unpaid principal balance (legal) 12,293   8,606
With an allowance recorded [Abstract]      
Recorded investment balance (book) 7,844   4,667
Unpaid principal balance (legal) 9,692   6,516
Related allowance 2,235   1,270
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 2,334   2,244
Unpaid principal balance (legal) 2,581   2,490
With an allowance recorded [Abstract]      
Recorded investment balance (book) 453   457
Unpaid principal balance (legal) 453   457
Related allowance 325   300
Average recorded investment 2,773 1,689  
Interest income recognized 19 25  
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 7,910   3,165
Unpaid principal balance (legal) 7,920   3,175
With an allowance recorded [Abstract]      
Recorded investment balance (book) 7,391   4,210
Unpaid principal balance (legal) 9,239   6,059
Related allowance 1,910   970
Average recorded investment 13,509 9,125  
Interest income recognized 100 41  
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 18   576
Unpaid principal balance (legal) 24   1,164
With an allowance recorded [Abstract]      
Average recorded investment 158 20  
Interest income recognized 0 0  
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 613   618
Unpaid principal balance (legal) 739   744
With an allowance recorded [Abstract]      
Average recorded investment 616 636  
Interest income recognized 11 11  
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 972   983
Unpaid principal balance (legal) 1,029   1,033
With an allowance recorded [Abstract]      
Average recorded investment 978 873  
Interest income recognized 6 4  
Originated Loans [Member] | Consumer Loans [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 8,262   7,693
Unpaid principal balance (legal) 9,181   8,595
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 10   12
Unpaid principal balance (legal) 20   21
With an allowance recorded [Abstract]      
Average recorded investment 11 9  
Interest income recognized 0 0  
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 8,252   7,681
Unpaid principal balance (legal) 9,161   8,574
With an allowance recorded [Abstract]      
Average recorded investment 8,003 6,388  
Interest income recognized 121 72  
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]      
With an allowance recorded [Abstract]      
Average recorded investment 0 2  
Interest income recognized 0 0  
Originated Loans [Member] | Residential Real Estate Mortgages [Member]      
With no related allowance recorded [Abstract]      
Recorded investment balance (book) 6,214   6,017
Unpaid principal balance (legal) 6,935   6,627
With an allowance recorded [Abstract]      
Average recorded investment 6,121 4,265  
Interest income recognized 67 30  
Acquired Loans [Member]      
With an allowance recorded [Abstract]      
Average recorded investment 1,205 10,019  
Interest income recognized 0 0  
Acquired Loans [Member] | Commercial Loans [Member]      
With an allowance recorded [Abstract]      
Recorded investment balance (book) 1,205   1,205
Unpaid principal balance (legal) 1,321   1,321
Related allowance 735   735
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member]      
With an allowance recorded [Abstract]      
Average recorded investment 0 2,883  
Interest income recognized 0 0  
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
Related allowance 735   $ 735
Average recorded investment 1,205 7,136  
Interest income recognized $ 0 $ 0