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Loans and Allowance for Credit Losses - Loans by Type as Percentage of Portfolio (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 1,264,228 $ 1,189,782        
Allowance for loan losses (Note 3) $ 14,582 $ 7,619 $ 15,065 $ 7,416 $ 7,601 $ 7,688
Percentage of allowance for credit losses 1.15% 0.64%        
Loans, net $ 1,249,646 $ 1,182,163        
Agricultural [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 40,684 $ 64,159        
Percentage of loans 3.22% 5.39%        
Percentage of increase decrease of loans (36.59%)          
Allowance for loan losses (Note 3) $ 78 $ 144 136 132 387 448
Commercial and Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 224,191 $ 210,210        
Percentage of loans 17.73% 17.67%        
Percentage of increase decrease of loans 6.65%          
Allowance for loan losses (Note 3) $ 2,896 $ 1,361 3,020 1,613 1,752 1,454
Commercial Real Estate Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 657,549 $ 630,953        
Percentage of loans 52.01% 53.03%        
Percentage of increase decrease of loans 4.22%          
Allowance for loan losses (Note 3) $ 7,237 $ 4,822 7,837 4,224 3,690 3,705
Consumer Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 38,614 $ 39,808        
Percentage of loans 3.05% 3.35%        
Percentage of increase decrease of loans (3.00%)          
Allowance for loan losses (Note 3) $ 885 $ 310 913 309 304 290
Construction Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 16,734 $ 14,736        
Percentage of loans 1.32% 1.24%        
Percentage of increase decrease of loans 13.56%          
Allowance for loan losses (Note 3) $ 70 $ 63 72 45 37 110
Residential Portfolio Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 247,618 $ 229,916        
Percentage of loans 19.59% 19.32%        
Percentage of increase decrease of loans 7.70%          
Allowance for loan losses (Note 3) $ 3,376 $ 906 $ 3,087 $ 691 $ 589 $ 671
Loans To Other Financial Institutions [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans (Note 3) $ 38,838          
Percentage of loans 3.07% 0.00%        
Percentage of increase decrease of loans 100.00%          
Allowance for loan losses (Note 3) $ 40