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v3.23.1

Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) Alternative Loan_modified | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest on loans | $ 22,600,000 |  | $ 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 |  |
Interest lost on nonaccrual loans | $ 79,000 | $ 95,000 |
Modified loans balance | $ 0 | $ 0 | 5,064,000
Troubled debt restructurings balance | Loan_modified | 0 |  |
Real estate acquired through foreclosure | $ 4,024,000 |  | 4,261,000
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 | $ 211,400,000 |  |
Non-residential Buildings |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 945,700,000 |  |
Residential Buildings and Dwellings |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 462,800,000 |  |
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 | $ 548,800,000 |  | 577,200,000
Increase (decrease) in accounts and notes receivable | $ (28,400,000) |  |
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 | $ 422,400,000 |  | $ 445,200,000
Increase (decrease) in accounts and notes receivable | $ (22,800,000) |  |
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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- 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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