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Loans and Allowance (Categories of Loans) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 1,452,461,000 $ 1,186,713,000 $ 1,171,387,000  
Undisbursed loans in process (9,502,000) (13,071,000)    
Unamortized deferred loan costs, net 6,467,000 6,503,000    
Allowance for loan losses (12,537,000) (12,387,000) $ (12,382,000) $ (12,382,000)
Net loans 1,436,889,000 1,167,758,000    
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 490,885,000 318,684,000    
Construction Loans [Member] | Commercial Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 52,889,000 28,164,000    
First Mortgage [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 476,422,000 444,243,000    
Second Mortgage [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 75,942,000 69,477,000    
Automobile Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 22,110,000 19,640,000    
Boat/RVs [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 175,747,000 169,238,000    
Other [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 6,190,000 6,188,000    
Commercial and Industrial [Member] | Commercial Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 152,276,000 131,079,000    
Real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 1,096,138,000 860,568,000    
Real estate | Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 490,885,000 318,684,000    
Real estate | Construction Loans [Member] | Commercial Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 52,889,000 28,164,000    
Real estate | First Mortgage [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 476,422,000 444,243,000    
Real estate | Second Mortgage [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 75,942,000 69,477,000    
Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 356,323,000 326,145,000    
Other | Automobile Loan [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 22,110,000 19,640,000    
Other | Boat/RVs [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 175,747,000 169,238,000    
Other | Other [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 6,190,000 6,188,000    
Other | Commercial and Industrial [Member] | Commercial Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 152,276,000 $ 131,079,000