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Loans and Allowance (Commercial and Retail Credit Exposure Credit Risk Profile by Internal Rating) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 1,172,636 $ 1,083,395 $ 1,022,388
First Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 478,848    
Second Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 71,222    
Commercial Real Estate [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 302,577 236,895  
Commercial Real Estate [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 295,548 226,439  
Commercial Real Estate [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,705 4,137  
Commercial Real Estate [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,297 6,319  
Commercial Real Estate [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 27    
Commercial Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 445,766 359,965  
Commercial Segment [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,472 8,746  
Commercial Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,868 6,971  
Commercial Segment [Member] | Doubtful [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 27    
Commercial Segment [Member] | Construction Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 22,453 15,744  
Commercial Segment [Member] | Construction Loans [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 21,782 13,986  
Commercial Segment [Member] | Construction Loans [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 254 1,309  
Commercial Segment [Member] | Construction Loans [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 417 449  
Commercial Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 131,103 123,043  
Commercial Segment [Member] | Commercial and Industrial [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 128,436 119,540  
Commercial Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 2,513 3,300  
Commercial Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 154 203  
Consumer [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 710,182 699,811  
Consumer [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,321 7,902  
Consumer [Member] | First Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 478,848 491,451  
Consumer [Member] | First Mortgage [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 473,329 484,658  
Consumer [Member] | First Mortgage [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 5,519 6,793  
Consumer [Member] | Second Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 71,222 70,990  
Consumer [Member] | Second Mortgage [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 70,769 70,086  
Consumer [Member] | Second Mortgage [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 453 904  
Consumer [Member] | Automobile Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 18,939 15,480  
Consumer [Member] | Automobile Loan [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 18,931 15,480  
Consumer [Member] | Automobile Loan [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 8    
Consumer [Member] | Boat/RVs [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 141,602 123,621  
Consumer [Member] | Boat/RVs [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 141,294 123,490  
Consumer [Member] | Boat/RVs [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 308 131  
Consumer [Member] | Other [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 5,892 6,171  
Consumer [Member] | Other [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans 5,859 6,097  
Consumer [Member] | Other [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 33 $ 74