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Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 Loan_modified | Jun. 30, 2024 USD ($) Loan_modified Alternative | Jun. 30, 2023 USD ($) Loan_modified | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest on loans |  | $ 32,300,000 |  | $ 29,900,000
Gross loans |  | 5,552,853,000 |  | 5,575,585,000
Minimum value of loans individually measured for impairment |  | $ 250,000,000 |  |
Number of alternatives for measuring impaired loans receivable | Alternative |  | 3 |  |
Interest lost on nonaccrual loans |  | $ 487,000 | $ 122,000 |
Troubled debt restructurings balance | Loan_modified | 0 | 0 | 0 |
Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Debt coverage ratio |  | 1.20x |  |
Commercial Real Estate | Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  | 65.00% |  |
Amortization period of loans |  | twenty |  |
Commercial Real Estate | Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Maximum loan-to-value ratio (in hundredths) |  | 80.00% |  |
Amortization period of loans |  | twenty five 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 |  | $ 223,100,000 |  |
Non-residential Buildings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans |  | 1,070,000,000.00 |  |
Residential Buildings and Dwellings |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans |  | $ 562,300,000 |  |
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 |  | $ 601,600,000 |  | 588,500,000
Increase in accounts and notes receivable |  | $ 13,200,000 |  |
Maximum loan-to-value ratio (in hundredths) |  | 65.00% |  |
Amortization period of loans |  | twenty-five years |  |
Loans receivable, time period |  | 1 year |  |
Agricultural | Corn and Other Grain Farming |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans |  | $ 490,200,000 |  | $ 472,500,000
Increase in accounts and notes receivable |  | $ 17,800,000 |  |
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 |  |
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 |  |

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