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v3.25.1

Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 USD ($) Loan_modified Alternative | Mar. 31, 2024 USD ($) Loan_modified | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest on loans | $ 31,700,000 |  | $ 33,700,000 |
Gross loans | 5,695,214,000 |  | 5,665,848,000 |
Allowance for credit losses | $ 70,051,000 | $ 67,936,000 | 70,182,000 | $ 68,675,000
Number of alternatives for measuring impaired loans receivable | Alternative | 3 |  |  |
Interest lost on nonaccrual loans | $ 471,000 |  | 267,000 |
Troubled debt restructurings balance | Loan_modified | 4 | 0 |  |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ 250,000,000 |  |  |
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 |  |  |
Motels and Hotels Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 218,000,000 |  |  |
Non-residential Buildings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,100,000,000 |  |  |
Residential Buildings and Dwellings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 589,800,000 |  |  |
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] |  |  |  |
Gross loans | $ 670,100,000 |  | 630,600,000 |
Increase in accounts and notes receivable | $ 39,500,000 |  |  |
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 | $ 573,100,000 |  | 507,600,000 |
Increase in accounts and notes receivable | 65,500,000 |  |  |
Agricultural | Real Estate Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ 1,292,000 | $ 1,358,000 | 1,361,000 | 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 | $ 26,028,000 | 24,631,000 | 25,602,000 | 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 | Real Estate Loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses | $ 3,731,000 | $ 2,701,000 | $ 3,275,000 | $ 2,918,000

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