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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jan. 07, 2022 USD ($) | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 USD ($) Contract | Dec. 31, 2021 USD ($) Contract | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  |  | 0.94% | 0.82% |
Notes receivable gross |  |  |  |  | $ 9,073,571,000 |  |
Loans pledged as collateral |  |  |  |  | 4,300,000,000 | $ 3,960,000,000 |
Loans held-for-sale |  |  |  |  | 0 | 0 |
Impaired, at carrying value |  |  |  |  | 7,800,000 |  |
Allowance for Credit Losses | $ 4,900,000 |  |  |  | 85,100,000 | 65,000,000.0 |
Reserve for credit risk for undisbursed commitments |  |  |  |  | 8,000,000.0 | 8,000,000.0 |
Purchased Credit Deteriorated (PCD) Loans | $ 8,600,000 |  |  |  |  |  |
(Recapture of) provision for unfunded loan commitments |  |  |  |  | 0 | $ (1,000,000) | $ 0
Allowance For Credit Losses Increase Decrease |  |  |  |  | 20,100,000 |  |
Allowance For Credit Losses Write Offs |  |  |  |  | 8,000,000.0 |  |
Provision For Credit Losses |  |  |  |  | $ 10,500,000 |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  |  |  |  | 0 | 0 |
Allocation of allowance to troubled debt restructuring |  |  |  |  | $ 0 | $ 0 |
Transition adjustment, allowance for credit loses for loans |  |  |  |  | 1,800,000 |  |
GDP [Member] | Forecast [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  | 2.80% | 1.30% | 0.30% |  |  |
Unemployment [Member] | Forecast [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  | 4.50% | 5.10% | 4.80% |  |  |
Suncrest Member |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Recovery |  |  |  |  | 893,000 |  |
Purchased Credit Deteriorated (PCD) Loans |  |  |  |  | 8,600,000 |  |
Provision For Credit Losses |  |  |  |  | $ 4,900,000 |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  |  | 79.73% |  |
Notes receivable gross |  |  |  |  | $ 6,884,948,000 | 5,789,730,000 |
Construction [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  |  | 75.83% |  |
Commercial and Industrial [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  |  | $ 947,365,000 |  |
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 |  |  |  |  | 433,600,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  |  | 388,500,000 | 351,700,000 |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  |  | $ 45,100,000 | $ 34,500,000 |
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) |  |  |  |  | 7.52% | 6.29% |
Notes receivable gross |  |  |  |  | $ 517,800,000 | $ 364,400,000 |
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 |  |  |  |  | 140,500,000 | 134,900,000 |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  |  | $ 377,300,000 | $ 229,500,000 |

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