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Loans - Delinquent Loans (Details)
 9 Months Ended
Sep. 30, 2019
USD ($)
payment
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans $ 12,375,000 $ 9,515,000  
Current Loans 557,753,000 578,418,000  
Total Loans 570,128,000 587,933,000 $ 577,115,000
Accruing Loans 90 or More Days Past Due $ 326,000 0  
Minimum period of default 90 days    
Number of monthly payments to demonstrate repayment ability | payment 6    
Undisbursed commitments $ 0 0  
Total nonaccrual Loans 12,756,000 12,052,000  
Total commercial and industrial      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 75,000 0  
Current Loans 48,062,000 56,978,000  
Total Loans 48,137,000 56,978,000 55,523,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 75,000 0  
Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 75,000 0  
Current Loans 47,280,000 55,929,000  
Total Loans 47,355,000 55,929,000 54,639,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 75,000 0  
Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Current Loans 782,000 1,049,000  
Total Loans 782,000 1,049,000 884,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 0 0  
Total real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,008,000 421,000  
Current Loans 274,951,000 288,779,000  
Total Loans 275,959,000 289,200,000 281,235,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 1,008,000 389,000  
Commercial real estate loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,008,000 389,000  
Current Loans 223,705,000 229,059,000  
Total Loans 224,713,000 229,448,000 212,639,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 1,008,000 389,000  
Single family residential loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 32,000  
Current Loans 51,062,000 59,399,000  
Total Loans 51,062,000 59,431,000 68,263,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 0 0  
Home Improvement and Home Equity      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Current Loans 184,000 321,000  
Total Loans 184,000 321,000 333,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 0 0  
Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 8,825,000 8,825,000  
Current Loans 107,618,000 99,970,000  
Total Loans 116,443,000 108,795,000 109,154,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 11,529,000 11,663,000  
Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 599,000 0  
Current Loans 59,501,000 61,149,000  
Total Loans 60,100,000 61,149,000 59,655,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual Loans 144,000 0  
Total installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,868,000 269,000  
Current Loans 67,621,000 71,542,000  
Total Loans 69,489,000 71,811,000 $ 71,548,000
Accruing Loans 90 or More Days Past Due 326,000 0  
Total nonaccrual Loans 0 0  
Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,868,000 269,000  
Current Loans 67,480,000 71,362,000  
Total Loans 69,348,000 71,631,000  
Accruing Loans 90 or More Days Past Due 326,000 0  
Overdraft protection lines      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Current Loans 38,000 41,000  
Total Loans 38,000 41,000  
Accruing Loans 90 or More Days Past Due 0 0  
Overdrafts      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Current Loans 103,000 139,000  
Total Loans 103,000 139,000  
Accruing Loans 90 or More Days Past Due 0 0  
Loans 30-60 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,680,000 162,000  
Loans 30-60 Days Past Due | Total commercial and industrial      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Total real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 32,000  
Loans 30-60 Days Past Due | Commercial real estate loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Single family residential loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 32,000  
Loans 30-60 Days Past Due | Home Improvement and Home Equity      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 455,000 0  
Loans 30-60 Days Past Due | Total installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,225,000 130,000  
Loans 30-60 Days Past Due | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,225,000 130,000  
Loans 30-60 Days Past Due | Overdraft protection lines      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 30-60 Days Past Due | Overdrafts      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 317,000 139,000  
Loans 61-89 Days Past Due | Total commercial and industrial      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Total real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Commercial real estate loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Single family residential loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Home Improvement and Home Equity      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Total installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 317,000 139,000  
Loans 61-89 Days Past Due | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 317,000 139,000  
Loans 61-89 Days Past Due | Overdraft protection lines      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 61-89 Days Past Due | Overdrafts      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 90 or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 10,378,000 9,214,000  
Loans 90 or More Days Past Due | Total commercial and industrial      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 75,000 0  
Loans 90 or More Days Past Due | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 75,000 0  
Loans 90 or More Days Past Due | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 90 or More Days Past Due | Total real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,008,000 389,000  
Loans 90 or More Days Past Due | Commercial real estate loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 1,008,000 389,000  
Loans 90 or More Days Past Due | Single family residential loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 90 or More Days Past Due | Home Improvement and Home Equity      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 90 or More Days Past Due | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 8,825,000 8,825,000  
Loans 90 or More Days Past Due | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 144,000 0  
Loans 90 or More Days Past Due | Total installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 326,000 0  
Loans 90 or More Days Past Due | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 326,000 0  
Loans 90 or More Days Past Due | Overdraft protection lines      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans 0 0  
Loans 90 or More Days Past Due | Overdrafts      
Financing Receivable, Past Due [Line Items]      
Total Past Due Loans $ 0 $ 0