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Loans (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 573,421,000 $ 587,933,000 $ 573,996,000
Commitments to Extend Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value, concentration of risk, commitments 209,335,000 144,643,000  
Standby Letters of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value, concentration of risk, commitments 875,000 1,183,000  
Loan Purchase Commitments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchase commitment     $ 30,000,000
Total commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 55,145,000 56,978,000  
Percentage of total loans (in hundredths) 9.60%    
Commercial and business loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 54,334,000 55,929,000  
Government program loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 811,000 1,049,000  
Total real estate mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 281,888,000 289,200,000  
Percentage of total loans (in hundredths) 49.20%    
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 227,525,000 229,448,000  
Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 54,142,000 59,431,000  
Home improvement and home equity loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 221,000 321,000  
Real Estate Construction and Development Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 114,611,000 108,795,000  
Percentage of total loans (in hundredths) 20.00%    
Agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 52,027,000 61,149,000  
Percentage of total loans (in hundredths) 9.10%    
Installment and student loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 69,750,000 $ 71,811,000  
Percentage of total loans (in hundredths) 12.20%