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Loans (Schedule of Allowance for Loan Losses and Recorded Investment in Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Allowance for Loan Losses:        
Individually Evaluated for Impairment $ 1,181 $ 2,228    
Collectively Evaluated for Impairment 13,238 13,455    
Total Ending Allowance Balance 14,460 15,694 $ 15,166 $ 14,808
Loans:        
Loans Individually Evaluated for Impairment 9,793 11,633    
Loans Collectively Evaluated for Impairment 2,144,933 2,133,752    
Loans, net of deferred income 2,163,545 [1] 2,154,502 [2]    
Accrued interest included in recorded investment 9,697 9,483    
Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 41 11    
Loans:        
Loans, net of deferred income 8,819 9,117    
Commercial and Industrial Loans and Leases        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 252 1,399    
Collectively Evaluated for Impairment 3,348 3,333    
Total Ending Allowance Balance 3,603 4,735 3,612 3,725
Loans:        
Loans Individually Evaluated for Impairment 4,249 5,918    
Loans Collectively Evaluated for Impairment 478,473 481,152    
Loans, net of deferred income 483,512 [1] 488,058 [2]    
Commercial and Industrial Loans and Leases | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 3 3    
Loans:        
Loans, net of deferred income 790 988    
Commercial Real Estate Loans        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 929 829    
Collectively Evaluated for Impairment 3,660 3,759    
Total Ending Allowance Balance 4,622 4,591 5,696 5,452
Loans:        
Loans Individually Evaluated for Impairment 5,401 5,552    
Loans Collectively Evaluated for Impairment 938,731 917,036    
Loans, net of deferred income 950,326 [1] 929,040 [2]    
Commercial Real Estate Loans | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 33 3    
Loans:        
Loans, net of deferred income 6,194 6,452    
Agricultural Loans        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 4,825 4,894    
Total Ending Allowance Balance 4,825 4,894 4,361 4,094
Loans:        
Loans Individually Evaluated for Impairment 143 163    
Loans Collectively Evaluated for Impairment 332,888 336,849    
Loans, net of deferred income 333,988 [1] 337,801 [2]    
Agricultural Loans | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 0 0    
Loans:        
Loans, net of deferred income 957 789    
Home Equity Loans        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 272 330    
Total Ending Allowance Balance 272 330 299 283
Loans:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 152,527 152,757    
Loans, net of deferred income 152,527 [1] 152,757 [2]    
Home Equity Loans | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 0 0    
Loans:        
Loans, net of deferred income 0 0    
Consumer Loans        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 316 298    
Total Ending Allowance Balance 316 298 244 235
Loans:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 64,655 67,647    
Loans, net of deferred income 64,655 [1] 67,647 [2]    
Consumer Loans | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 0 0    
Loans:        
Loans, net of deferred income 0 0    
Residential Mortgage Loans        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 322 338    
Total Ending Allowance Balance 327 343 348 329
Loans:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 177,659 178,311    
Loans, net of deferred income 178,537 [1] 179,199 [2]    
Residential Mortgage Loans | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality 5 5    
Loans:        
Loans, net of deferred income 878 888    
Unallocated        
Allowance for Loan Losses:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 495 503    
Total Ending Allowance Balance 495 503 $ 606 $ 690
Unallocated | Receivables Acquired with Deteriorated Credit Quality        
Allowance for Loan Losses:        
Acquired with Deteriorated Credit Quality $ 0 $ 0    
[1] Total recorded investment in loans includes $9,697 in accrued interest.
[2] Total recorded investment in loans includes $9,483 in accrued interest.