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Loans (Schedule of Allowance for Loan Losses and Recorded Investment in Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment $ 2,228 $ 255    
Collectively Evaluated for Impairment 13,455 14,448    
Total Ending Allowance Balance 15,694 14,808 $ 14,438 $ 14,929
Loans:        
Loans Individually Evaluated for Impairment 11,633 1,239    
Loans Collectively Evaluated for Impairment 2,133,752 1,989,128    
Loans, net of deferred income 2,154,502 [1] 2,001,415 [2]    
Accrued interest receivable included in total recorded investment in loans and leases 9,483 8,011    
Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 11 105    
Loans:        
Loans, net of deferred income 9,117 11,048 7,555  
Commercial and Industrial Loans and Leases        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 1,399 24    
Collectively Evaluated for Impairment 3,333 3,698    
Total Ending Allowance Balance 4,735 3,725 4,242 4,627
Loans:        
Loans Individually Evaluated for Impairment 5,918 113    
Loans Collectively Evaluated for Impairment 481,152 456,769    
Loans, net of deferred income 488,058 [1] 458,538 [2]    
Commercial and Industrial Loans and Leases | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 3 3    
Loans:        
Loans, net of deferred income 988 1,656 1,325  
Commercial Real Estate Loans        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 829 231    
Collectively Evaluated for Impairment 3,759 5,172    
Total Ending Allowance Balance 4,591 5,452 6,342 7,273
Loans:        
Loans Individually Evaluated for Impairment 5,552 832    
Loans Collectively Evaluated for Impairment 917,036 849,510    
Loans, net of deferred income 929,040 [1] 858,030 [2]    
Commercial Real Estate Loans | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 3 49    
Loans:        
Loans, net of deferred income 6,452 7,688 5,363  
Agricultural Loans        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 4,894 4,046    
Total Ending Allowance Balance 4,894 4,094 2,115 1,123
Loans:        
Loans Individually Evaluated for Impairment 163 294    
Loans Collectively Evaluated for Impairment 336,849 305,946    
Loans, net of deferred income 337,801 [1] 306,946 [2]    
Agricultural Loans | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 0 48    
Loans:        
Loans, net of deferred income 789 706 0  
Home Equity Loans        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 330 283    
Total Ending Allowance Balance 330 283 383 246
Loans:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 152,757 134,032    
Loans, net of deferred income 152,757 [1] 134,032 [2]    
Home Equity Loans | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 0 0    
Loans:        
Loans, net of deferred income 0 0    
Consumer Loans        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 298 230    
Total Ending Allowance Balance 298 235 230 354
Loans:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 67,647 60,046    
Loans, net of deferred income 67,647 [1] 60,099 [2]    
Consumer Loans | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 0 5    
Loans:        
Loans, net of deferred income 0 53 0  
Residential Mortgage Loans        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 338 329    
Total Ending Allowance Balance 343 329 414 622
Loans:        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 178,311 182,825    
Loans, net of deferred income 179,199 [1] 183,770 [2]    
Residential Mortgage Loans | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality 5 0    
Loans:        
Loans, net of deferred income 888 945 867  
Unallocated        
Ending Allowance Balance Attributable to Loans:        
Individually Evaluated for Impairment 0 0    
Collectively Evaluated for Impairment 503 690    
Total Ending Allowance Balance 503 690 $ 712 $ 684
Unallocated | Loans Acquired with Deteriorated Credit Quality        
Ending Allowance Balance Attributable to Loans:        
Acquired with Deteriorated Credit Quality $ 0 $ 0    
[1] Total recorded investment in loans includes $9,483 in accrued interest.
[2] Total recorded investment in loans includes $8,011 in accrued interest.