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Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) Loan_modified Alternative | Mar. 31, 2023 USD ($) Loan_modified | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest on loans | $ 31,300,000 |  | $ 29,900,000
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 | $ 267,000 | $ 79,000 |
Troubled debt restructurings balance | Loan_modified | 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 |  |
Non-residential Buildings |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 1,060,000,000.00 |  |
Residential Buildings and Dwellings |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 549,300,000 |  |
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 | $ 602,900,000 |  | 588,500,000
Increase in accounts and notes receivable | $ 14,400,000 |  |
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 | $ 488,500,000 |  | $ 472,500,000
Increase in accounts and notes receivable | $ 16,000,000 |  |
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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- 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 Specifies the time period covered by the loan receivable. + 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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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
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- Definition Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-14 + Details
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- Definition The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481746/310-40-50-1 + Details
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