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Loans and Allowance for Credit Losses - Additional Information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) Alternative Loan_modified | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Increase (decrease) in accounts and notes receivable | $ 740,100,000 |  |  |  |
Accrued interest on loans | 29,900,000 | $ 23,000,000.0 |  |  |
Minimum value of loans individually measured for impairment | $ 250,000,000 |  |  |  |
Number of alternatives for measuring impaired loans receivable | Alternative | 3 |  |  |  |
Allowance for credit losses | $ 68,675,000 | 59,093,000 | $ 54,655,000 | $ 41,910,000 |
Recorded balance of nonaccrual loans | 18,832,000 | 15,956,000 |  |  |
Interest lost on nonaccrual loans | $ 412,000 | 103,000 | 308,000 |  |
Troubled debt restructurings balance | Loan_modified | 0 |  |  |  |
Real estate acquired through foreclosure | $ 1,163,000 | 4,261,000 |  |  |
Mortgage loans secured by real estate In foreclosure | $ 399,000 | 425,000 |  |  |
ASU 2016-13 | Financial Asset Acquired with Credit Deterioration | Revision of Prior Period, Adjustment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses |  |  |  |  | $ 833,000
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Debt coverage ratio | 1.20x |  |  |  |
Amortization period of loans | twenty years |  |  |  |
Recorded balance of nonaccrual loans | $ 10,237,000 | 7,640,000 |  |  |
Commercial Real Estate | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 65.00% |  |  |  |
Commercial Real Estate | Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 80.00% |  |  |  |
1-4 Family Residential Properties |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Period when loans charged-down | 180 days |  |  |  |
Recorded balance of nonaccrual loans | $ 4,940,000 | 4,943,000 |  |  |
Jefferson Bank |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans acquired amount | $ 730,200,000 |  |  |  |
Unsecured Open-end Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Period when loans charged-down | 180 days |  |  |  |
Other Secured Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Period when loans charged-down | 120 days |  |  |  |
Agricultural |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 65.00% |  |  |  |
Amortization period of loans | twenty-five years |  |  |  |
Loans receivable, time period | one year |  |  |  |
Agricultural | Real Estate Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses | $ 1,366,000 | 1,433,000 | 1,257,000 | 1,084,000 |
Commercial and Industrial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 80.00% |  |  |  |
Amortization period of loans | seven years |  |  |  |
Loans receivable, time period | one year |  |  |  |
Allowance for credit losses | $ 25,450,000 | $ 20,808,000 | $ 19,241,000 | $ 13,485,000 |
Residential Properties | Real Estate Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 80.00% |  |  |  |
Amortization period of loans | twenty-five years |  |  |  |
Balloon period | five years |  |  |  |

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- Definition The ratio used to analyze the amount of debt that can be supported by the cash flow generated from the property. The calculation is the net income generated by the property divided by the commercial mortgage payment. + References No definition available. + Details
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- Definition The amount of the mortgage loan as a percentage of the total appraised value of the real property. Loan-to-value is one of the key risk factors that lenders assess when qualifying borrowers for a mortgage. + References No definition available. + Details
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