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Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2025 USD ($) Loan_modified | Sep. 30, 2024 USD ($) Loan_modified | Sep. 30, 2025 USD ($) Alternative | Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 35,500,000 |  | $ 35,500,000 |  |  | $ 33,700,000 |  |
Gross loans | 5,818,495,000 |  | 5,818,495,000 |  |  | 5,665,848,000 |  |
Allowance for credit losses | $ 72,925,000 | $ 68,774,000 | $ 72,925,000 | $ 68,774,000 | $ 71,160,000 | 70,182,000 | $ 68,312,000 | $ 68,675,000
Number of alternatives for measuring impaired loans receivable | Alternative |  |  | 3 |  |  |  |  |
Interest lost on nonaccrual loans |  |  | $ 981,000 | 516,000 |  |  |  |
Troubled debt restructurings balance | Loan_modified | 1 | 0 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Commercial Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Thresholds percentage of total capital |  |  | 300.00% |  |  |  |  |
Commercial Real Estate | Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  |  | 65.00% |  |  |  |  |
Debt coverage ratio |  |  | 1.20x |  |  |  |  |
Amortization period of loans |  |  | twenty years |  |  |  |  |
Commercial Real Estate | Maximum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  |  | 85.00% |  |  |  |  |
Debt coverage ratio |  |  | 1.35x |  |  |  |  |
Amortization period of loans |  |  | thirty years |  |  |  |  |
1-4 Family Residential Properties |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Period when loans charged-down | 180 days |  | 180 days |  |  |  |  |
Motels and Hotels Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 222,400,000 |  | $ 222,400,000 |  |  |  |  |
Non-residential Buildings |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 1,000,000,000 |  | 1,000,000,000 |  |  |  |  |
Residential Buildings and Dwellings |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 604,800,000 |  | $ 604,800,000 |  |  |  |  |
Unsecured Open-end Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Period when loans charged-down | 180 days |  | 180 days |  |  |  |  |
Other Secured Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Period when loans charged-down | 120 days |  | 120 days |  |  |  |  |
Agricultural |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 678,700,000 |  | $ 678,700,000 |  |  | 630,600,000 |  |
Increase in accounts and notes receivable |  |  | $ 48,100,000 |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  |  | 80.00% |  |  |  |  |
Loans receivable, time period |  |  | 1 year |  |  |  |  |
Agricultural | Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Amortization period of loans |  |  | twenty-five |  |  |  |  |
Agricultural | Maximum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Amortization period of loans |  |  | thirty years |  |  |  |  |
Agricultural | Corn and Other Grain Farming |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | 579,600,000 |  | $ 579,600,000 |  |  | 507,600,000 |  |
Increase in accounts and notes receivable |  |  | 72,000,000 |  |  |  |  |
Agricultural | Real Estate Loan |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses | 1,265,000 | $ 1,342,000 | $ 1,265,000 | 1,342,000 | 1,322,000 | 1,361,000 | 1,372,000 | 1,366,000
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 |  |  | 1 year |  |  |  |  |
Allowance for credit losses | 25,964,000 | 25,569,000 | $ 25,964,000 | 25,569,000 | 25,618,000 | 25,602,000 | 24,931,000 | 25,450,000
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 |  |  |  |  |
Construction and Land Development |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Thresholds percentage of total capital |  |  | 100.00% |  |  |  |  |
Construction and Land Development | Real Estate Loan |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses | 4,686,000 | $ 2,674,000 | $ 4,686,000 | $ 2,674,000 | $ 4,066,000 | $ 3,275,000 | $ 2,646,000 | $ 2,918,000
Construction and Land Development | Real Estate Loan | Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Gross loans | $ 2,000,000 |  | $ 2,000,000 |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  |  | 65.00% |  |  |  |  |
Amortization period of loans |  |  | twenty |  |  |  |  |
Construction and Land Development | Real Estate Loan | Maximum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  |  | 80.00% |  |  |  |  |
Amortization period of loans |  |  | thirty years |  |  |  |  |

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