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Loans and Allowance for Credit Losses - Loans by Type as Percentage of Portfolio (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 1,418,590 | $ 1,410,653 |  |
Allowance for loan losses (Note 3) | $ 16,037 | $ 15,685 | $ 15,065 | $ 7,619
Percentage of allowance for credit losses | 1.13% | 1.11% |  |
Loans, net | $ 1,402,553 | $ 1,394,968 |  |
Agricultural [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 41,950 | $ 49,210 |  |
Percentage of loans | 3.00% | 3.50% |  |
Percentage of increase decrease of loans | (14.80%) |  |  |
Allowance for loan losses (Note 3) | $ 97 | $ 94 | 135 | 144
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 231,222 | $ 229,915 |  |
Percentage of loans | 16.30% | 16.30% |  |
Percentage of increase decrease of loans | 0.60% |  |  |
Allowance for loan losses (Note 3) | $ 2,243 | $ 2,216 | 3,020 | 1,361
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 794,705 | $ 786,921 |  |
Percentage of loans | 56.00% | 55.80% |  |
Percentage of increase decrease of loans | 1.00% |  |  |
Allowance for loan losses (Note 3) | $ 9,167 | $ 8,820 | 7,837 | 4,822
Consumer Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 34,268 | $ 36,541 |  |
Percentage of loans | 2.40% | 2.60% |  |
Percentage of increase decrease of loans | (6.20%) |  |  |
Allowance for loan losses (Note 3) | $ 918 | $ 823 | 913 | 310
Construction Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 17,890 | $ 20,936 |  |
Percentage of loans | 1.30% | 1.50% |  |
Percentage of increase decrease of loans | (14.50%) |  |  |
Allowance for loan losses (Note 3) | $ 49 | $ 58 | 73 | 63
Residential Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 268,523 | $ 267,730 |  |
Percentage of loans | 18.90% | 19.00% |  |
Percentage of increase decrease of loans | 0.30% |  |  |
Allowance for loan losses (Note 3) | $ 3,513 | $ 3,644 | $ 3,087 | $ 906
Loans To Other Financial Institutions [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans (Note 3) | $ 30,032 | $ 19,400 |  |
Percentage of loans | 2.10% | 1.40% |  |
Percentage of increase decrease of loans | 54.80% |  |  |
Allowance for loan losses (Note 3) | $ 50 | $ 30 |  |

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