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Loans and Allowance for Credit Losses - Loans by Type as Percentage of Portfolio (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 1,309,800 $ 1,189,782        
Allowance for loan losses (Note 3) $ 14,872 $ 7,619 $ 14,582 $ 7,457 $ 7,416 $ 7,688
Percentage of allowance for credit losses 1.14% 0.64%        
Loans, net $ 1,294,928 $ 1,182,163        
Agricultural [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 43,290 $ 64,159        
Percentage of loans 3.31% 5.39%        
Percentage of increase decrease of loans (32.53%)          
Allowance for loan losses (Note 3) $ 83 $ 144 78 140 132 448
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 222,357 $ 210,210        
Percentage of loans 16.98% 17.67%        
Percentage of increase decrease of loans 5.78%          
Allowance for loan losses (Note 3) $ 2,523 $ 1,361 2,896 1,373 1,613 1,454
Commercial Real Estate Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 709,960 $ 630,953        
Percentage of loans 54.20% 53.03%        
Percentage of increase decrease of loans 12.52%          
Allowance for loan losses (Note 3) $ 8,145 $ 4,822 7,237 4,609 4,224 3,705
Consumer Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 37,605 $ 39,808        
Percentage of loans 2.87% 3.35%        
Percentage of increase decrease of loans (5.53%)          
Allowance for loan losses (Note 3) $ 826 $ 310 885 303 309 290
Construction Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 16,477 $ 14,736        
Percentage of loans 1.26% 1.24%        
Percentage of increase decrease of loans 11.81%          
Allowance for loan losses (Note 3) $ 51 $ 63 70 59 45 110
Residential Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 256,348 $ 229,916        
Percentage of loans 19.57% 19.32%        
Percentage of increase decrease of loans 11.50%          
Allowance for loan losses (Note 3) $ 3,204 $ 906 3,376 $ 869 $ 691 $ 671
Loans To Other Financial Institutions [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 23,763          
Percentage of loans 1.81% 0.00%        
Percentage of increase decrease of loans 100.00%          
Allowance for loan losses (Note 3) $ 40   $ 40