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Loans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Category
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 614,095 $ 545,235 $ 515,002  
Allowance for loan losses (9,251) (8,583) (9,353) $ (8,554)
Net deferred origination fees and costs 1,009 1,327    
Loans, net 605,853 537,979    
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 136,095 120,751 110,644  
Allowance for loan losses $ (3,097) (3,581) (3,199) (2,899)
Loan portfolio by segment 22.00%      
Commercial [Member] | Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 3 months      
Commercial [Member] | Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 6 months      
Commercial Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 292,316 256,955 235,296  
Allowance for loan losses $ (3,343) (1,825) (2,290) (1,723)
Categories of loans | Category 2      
Loan portfolio by segment 48.00%      
Commercial Real Estate [Member] | Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 3 months      
Commercial Real Estate [Member] | Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 6 months      
Agriculture [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 84,813 61,144 51,730  
Allowance for loan losses $ (1,060) (580) (557) (915)
Loan portfolio by segment 14.00%      
Agriculture [Member] | Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 3 months      
Agriculture [Member] | Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 6 months      
Residential Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 43,375 50,511 52,809  
Allowance for loan losses $ (739) (1,181) (1,216) (1,148)
Loan portfolio by segment 7.00%      
Residential Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 12,110 5,963 10,444  
Allowance for loan losses $ (334) (161) (441) (724)
Loan portfolio by segment 2.00%      
Residential Construction [Member] | Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 3 months      
Residential Construction [Member] | Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
General frequency of collateral valuation 6 months      
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 45,386 49,911 54,079  
Allowance for loan losses $ (641) $ (886) $ (1,023) $ (1,110)
Loan portfolio by segment 7.00%      
Consumer [Member] | Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Delinquent loans revaluation period 3 years      
Consumer [Member] | Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Delinquent loans revaluation period 12 years