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Loans - Delinquent Loans (Details)
 9 Months Ended
Sep. 30, 2021
USD ($)
payment
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Financing Receivable, Past Due [Line Items]      
Total Loans $ 807,937,000 $ 655,411,000 $ 661,482,000
Accruing Loans 90 or More Days Past Due $ 318,000 513,000  
Minimum period of default 90 days    
Number of monthly payments to demonstrate repayment ability | payment 6    
Undisbursed commitments $ 0 0  
Total nonaccrual loans 11,551,000 11,496,000  
Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Total Loans 51,135,000 47,514,000 65,742,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 0 0  
Commercial and Industrial | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 44,713,000 37,349,000 39,218,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 0 0  
Commercial and Industrial | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 6,422,000 10,165,000 26,524,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 0 0  
Real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Loans 481,930,000 320,294,000 309,849,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 0 0  
Real estate mortgage | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total Loans 309,727,000 282,951,000 264,013,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 0 0  
Real estate mortgage | Residential mortgages      
Financing Receivable, Past Due [Line Items]      
Total Loans 172,120,000 37,236,000 45,722,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 0 0  
Real estate mortgage | Home improvement and home equity loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 83,000 107,000 114,000
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 Loans 165,370,000 175,016,000 171,889,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 11,273,000 11,057,000  
Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 56,091,000 51,079,000 51,587,000
Accruing Loans 90 or More Days Past Due 0 0  
Total nonaccrual loans 278,000 439,000  
Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 53,411,000 61,508,000 $ 62,415,000
Accruing Loans 90 or More Days Past Due 318,000 513,000  
Total nonaccrual loans 0 0  
Total Past Due Loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 13,621,000 11,126,000  
Total Past Due Loans | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 184,000  
Total Past Due Loans | Commercial and Industrial | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 184,000  
Total Past Due Loans | Commercial and Industrial | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Total Past Due Loans | Real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Loans 3,408,000 0  
Total Past Due Loans | Real estate mortgage | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Total Past Due Loans | Real estate mortgage | Residential mortgages      
Financing Receivable, Past Due [Line Items]      
Total Loans 3,395,000 0  
Total Past Due Loans | Real estate mortgage | Home improvement and home equity loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 13,000 0  
Total Past Due Loans | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Loans 8,988,000 8,605,000  
Total Past Due Loans | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 236,000 439,000  
Total Past Due Loans | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 989,000 1,898,000  
Current Loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 794,316,000 644,285,000  
Current Loans | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Total Loans 51,135,000 47,330,000  
Current Loans | Commercial and Industrial | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 44,713,000 37,165,000  
Current Loans | Commercial and Industrial | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 6,422,000 10,165,000  
Current Loans | Real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Loans 478,522,000 320,294,000  
Current Loans | Real estate mortgage | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total Loans 309,727,000 282,951,000  
Current Loans | Real estate mortgage | Residential mortgages      
Financing Receivable, Past Due [Line Items]      
Total Loans 168,725,000 37,236,000  
Current Loans | Real estate mortgage | Home improvement and home equity loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 70,000 107,000  
Current Loans | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Loans 156,382,000 166,411,000  
Current Loans | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 55,855,000 50,640,000  
Current Loans | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 52,422,000 59,610,000  
Loans 30-60 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Loans 3,873,000 694,000  
Loans 30-60 Days Past Due | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 184,000  
Loans 30-60 Days Past Due | Commercial and Industrial | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 184,000  
Loans 30-60 Days Past Due | Commercial and Industrial | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 30-60 Days Past Due | Real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Loans 3,408,000 0  
Loans 30-60 Days Past Due | Real estate mortgage | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 30-60 Days Past Due | Real estate mortgage | Residential mortgages      
Financing Receivable, Past Due [Line Items]      
Total Loans 3,395,000 0  
Loans 30-60 Days Past Due | Real estate mortgage | Home improvement and home equity loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 13,000 0  
Loans 30-60 Days Past Due | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 30-60 Days Past Due | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 30-60 Days Past Due | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 465,000 510,000  
Loans 61-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Loans 206,000 875,000  
Loans 61-89 Days Past Due | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Commercial and Industrial | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Commercial and Industrial | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Real estate mortgage | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Real estate mortgage | Residential mortgages      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Real estate mortgage | Home improvement and home equity loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
Loans 61-89 Days Past Due | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 206,000 875,000  
91 - 120 days      
Financing Receivable, Past Due [Line Items]      
Total Loans 9,542,000 9,557,000  
91 - 120 days | Commercial and Industrial      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Commercial and Industrial | Commercial and business loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Commercial and Industrial | Government program loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Real estate mortgage      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Real estate mortgage | Commercial real estate      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Real estate mortgage | Residential mortgages      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Real estate mortgage | Home improvement and home equity loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 0 0  
91 - 120 days | Real estate construction and development      
Financing Receivable, Past Due [Line Items]      
Total Loans 8,988,000 8,605,000  
91 - 120 days | Agricultural loans      
Financing Receivable, Past Due [Line Items]      
Total Loans 236,000 439,000  
91 - 120 days | Installment and student loans      
Financing Receivable, Past Due [Line Items]      
Total Loans $ 318,000 $ 513,000