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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) Loan | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans held-for-sale | $ 0 |  | $ 0 |  |  |  |  | $ 0
Impaired, at carrying value |  |  |  |  |  |  |  | 7,800,000
Allowance for Credit Losses | 89,000,000 |  | 89,000,000 |  |  |  |  | 85,100,000
Reserve for credit risk for undisbursed commitments | 8,000,000 |  | 8,000,000 |  |  |  |  | 8,000,000
Allocation of allowance to troubled debt restructuring |  | $ 0 |  | $ 0 |  |  |  | 0
Increase in reserve for unfunded loan commitments | 900,000 | $ 0 | 0 | $ 0 |  |  |  |
Allowance For Credit Losses Increase Decrease |  |  | 4,000,000 |  |  |  |  | $ 3,900,000
Allowance For Credit Losses Write Offs |  |  | 8,000,000 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Loan |  |  |  | 0 |  |  |  | 0
Loan Pledged As Collateral | $ 4,350,000,000 |  | 4,350,000,000 |  |  |  |  | $ 4,300,000,000
Allowance for write off |  |  | $ 122,000 |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  | 5.70% | 5.20% | 3.80% |
GDP [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  |  |  | 2.10% |
GDP [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  | 1.10% | 0.30% |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 80.81% |  | 80.81% |  |  |  |  |
Notes receivable gross | $ 6,843,059,000 |  | $ 6,843,059,000 |  |  |  |  | 6,884,948,000
Construction [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 77.08% |  | 77.08% |  |  |  |  |
Loans Secured by Dairy & Livestock Land [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  |  |  |  |  | 2,000,000
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  |  |  |  |  | 1,000,000
Performing Financing Receivable [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  |  |  |  |  | $ 4,800,000
Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 1.00% |  | 1.00% |  |  |  |  | 0.94%
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross | $ 351,500,000 |  | $ 351,500,000 |  |  |  |  | $ 433,600,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross | 301,500,000 |  | 301,500,000 |  |  |  |  | 388,500,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross | $ 50,000,000 |  | $ 50,000,000 |  |  |  |  | $ 45,100,000
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) | 7.44% |  | 7.44% |  |  |  |  | 7.52%
Notes receivable gross | $ 509,200,000 |  | $ 509,200,000 |  |  |  |  | $ 517,800,000
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 | 133,200,000 |  | 133,200,000 |  |  |  |  |
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 |  |  |  |  |  |  |  | 140,500,000
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 |  |  |  |  |  |  |  | $ 377,300,000
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 | $ 376,000 |  | $ 376,000 |  |  |  |  |

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