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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 |  |  |

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