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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans held-for-sale | $ 0 |  |  |  |  | $ 0
Allowance for Credit Losses | 82,900,000 |  |  |  |  | 86,800,000
Reserve for credit risk for undisbursed commitments | 6,300,000 |  |  |  |  | 7,500,000
Increase in reserve for unfunded loan commitments | 1,300,000 | $ 0 |  |  |  |
Allowance For Credit Losses Increase Decrease |  | $ 3,900,000 |  |  |  | 3,900,000
Allowance For Credit Losses Write Offs | 6,300,000 |  |  |  |  |
Loan Pledged As Collateral | $ 4,320,000,000 |  |  |  |  | 4,040,000,000.00
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 80.50% |  |  |  |  |
Notes receivable gross | $ 6,618,637,000 |  |  |  |  | $ 6,784,505,000
Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 77.21% |  |  |  |  |
Minimum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 0.97% |  |  |  |  |
Minimum | GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 1.40% | 1.00% |
Minimum | Unemployment [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  | 5.50% |
Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  |  |  | 0.98%
Maximum | GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 1.90% |  |  |
Maximum | Unemployment [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 5.50% |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | $ 342,400,000 |  |  |  |  | $ 412,900,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 298,300,000 |  |  |  |  | 374,900,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | $ 44,100,000 |  |  |  |  | $ 38,000,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 6.96% |  |  |  |  | 7.34%
Notes receivable gross | $ 460,700,000 |  |  |  |  | $ 497,700,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Dairy & Livestock Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 121,900,000 |  |  |  |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Dairy & Livestock Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  |  |  |  |  | 122,400,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  |  |  |  |  | $ 375,300,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | $ 338,800 |  |  |  |  |

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