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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 07, 2022 USD ($) | Mar. 31, 2023 USD ($) Loan | Mar. 31, 2022 USD ($) | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2022 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  | $ 8,935,357,000 |  |  |  |
Loans pledged as collateral |  | 4,320,000,000 | $ 4,300,000,000 |  |  |
Loans held-for-sale |  | 0 |  |  |  | $ 0
Impaired, at carrying value |  |  |  |  |  | 7,800,000
Allowance for Credit Losses | $ (4,900,000) | (86,500,000) |  |  |  | (85,100,000)
PCD Loans | $ 8,600,000 |  |  |  |  |
Net charge-offs |  | 77,000 |  |  |  |
Reserve for credit risk for undisbursed commitments |  | 8,500,000 |  |  |  | 8,000,000.0
Allocation of allowance to troubled debt restructuring |  |  | 0 |  |  | 0
Increase in reserve for unfunded loan commitments |  | 500,000 | 0 |  |  |
Allowance For Credit Losses Increase Decrease |  | 1,500,000 |  |  |  | $ 1,400,000
Allowance For Credit Losses Write Offs |  | $ 8,500,000 |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Loan |  | 0 |  |  |  | 0
Minimum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 0.97% |  |  |  | 0.94%
GDP [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  | 1.40% |  |  |  |
GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 2.40% | 0.90% |
Unemployment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  | 4.20% |  |  |  |
Unemployment [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | (4.80%) | 5.10% |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 81.59% |  |  |  |
Notes receivable gross |  | $ 6,950,302,000 |  |  |  | $ 6,884,948,000
Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 77.72% |  |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  | $ 896,117,000 |  |  |  |
Loans Secured by Dairy & Livestock Land [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  |  |  | 2,000,000.0
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  |  |  | 1,000,000.0
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
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  | 307,800,000 |  |  |  | 433,600,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  |  | 261,300,000 |  |  | $ 388,500,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  | $ 46,500,000 | $ 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) |  | 7.45% |  |  |  | 7.52%
Notes receivable gross |  | $ 517,800,000 |  |  |  | $ 517,800,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  | 138,400,000 |  |  |  |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  | $ 379,400,000 |  |  |  |
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 |  |  |  |  |  | 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

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