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Loans - Loans (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 649,654,000 $ 597,374,000 $ 573,421,000
Unsecured Debt [Member] | Paycheck Protection Program [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amount $ 26,035,000    
Life of the debt instrument 2 years    
Interest rate 1.00%    
Commitments to extend credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value, concentration of risk, commitments $ 231,275,000 197,559,000  
Standby letters of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value, concentration of risk, commitments $ 3,615,000 1,662,000  
Loan purchase commitments      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Committed interest 100.00%    
Purchase commitment $ 30,000,000    
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 68,230,000 45,278,000 55,145,000
Percentage of total loans 10.60%    
Commercial and Industrial | Commercial and business loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 41,525,000 44,534,000 54,334,000
Commercial and Industrial | Government program loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 26,705,000 744,000 811,000
Real estate mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 314,438,000 291,237,000 281,888,000
Percentage of total loans 48.40%    
Real estate mortgage | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 264,492,000 245,183,000 227,525,000
Real estate mortgage | Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 49,826,000 45,881,000 54,142,000
Real estate mortgage | Home improvement and home equity loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 120,000 173,000 221,000
Real estate construction and development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 153,655,000 138,784,000 114,611,000
Percentage of total loans 23.70%    
Agricultural      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 48,979,000 52,197,000 52,027,000
Percentage of total loans 7.50%    
Installment and student loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 64,352,000 $ 69,878,000 $ 69,750,000
Percentage of total loans 9.80%