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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 07, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 USD ($) Loan | Sep. 30, 2021 USD ($) Loan | Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable gross |  | $ 8,764,319,000 |  |  |  |  | $ 8,764,319,000 |  | $ 7,879,537,000
Loans held-for-sale |  | 0 |  |  |  |  | 0 |  | 0
Impaired, at carrying value |  | 5,800,000 |  |  |  |  | 5,800,000 |  |
Allowance for Credit Losses | $ 4,900,000 | 82,600,000 |  |  |  |  | 82,600,000 |  | 65,000,000.0
Reserve for credit risk for undisbursed commitments |  | 8,000,000.0 |  |  |  |  | 8,000,000.0 |  | 8,000,000.0
Allocation of allowance to troubled debt restructuring |  | 0 |  |  |  |  | 0 |  | 0
Increase in reserve for unfunded loan commitments |  | 0 | $ 0 |  |  |  | 0 | $ 1,000,000 |
Allowance For Credit Losses Increase Decrease |  |  |  |  |  |  | 17,600,000 |  |
Provision For Credit Losses |  |  |  |  |  |  | 8,100,000 |  |
Allowance For Credit Losses Write Offs |  |  |  |  |  |  | $ 8,000,000.0 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Loan |  |  |  |  |  |  | 0 | 0 |
Loan Pledged As Collateral |  | $ 4,330,000,000 |  |  |  |  | $ 4,330,000,000 |  | 3,960,000,000
Purchased Credit Deteriorated (PCD) Loans | $ 8,600,000 |  |  |  |  |  |  |  |
Recovery |  |  |  |  |  |  | 877,000 |  |
Allowance for write off |  |  |  |  |  |  |  | $ 2,800,000 |
Suncrest PCD Loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Provision For Credit Losses |  |  |  |  |  |  | 4,900,000 |  |
Purchased Credit Deteriorated (PCD) Loans |  |  |  |  |  |  | 8,600,000 |  |
Recovery |  |  |  |  |  |  | $ 877,000 |  |
Forecast [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 5.10% | 5.30% | 5.00% |  |  |
GDP [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 2.50% | 1.60% | 0.40% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 80.07% |  |  |  |  | 80.07% |  |
Notes receivable gross |  | $ 6,685,245,000 |  |  |  |  | $ 6,685,245,000 |  | 5,789,730,000
Construction [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 76.19% |  |  |  |  | 76.19% |  |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable gross |  | $ 950,923,000 |  |  |  |  | $ 950,923,000 |  | $ 811,691,000
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  | 1,000,000.0 |  |  |  |  | 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 |  |  |  |  | $ 4,800,000 |  |
Minimum |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 0.94% |  |  |  |  | 0.94% |  | 0.82%
Maximum |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 0.94% |  |  |  |  | 0.94% |  | 0.84%
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable gross |  | $ 323,100,000 |  |  |  |  | $ 323,100,000 |  | $ 386,200,000
Allowance for Credit Losses |  | 17,300,000 |  |  |  |  | 17,300,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable gross |  | 264,700,000 |  |  |  |  | 264,700,000 |  |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Notes receivable gross |  | $ 58,400,000 |  |  |  |  | $ 58,400,000 |  | $ 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) |  | 7.28% |  |  |  |  | 7.28% |  | 6.29%
Notes receivable gross |  | $ 486,400,000 |  |  |  |  | $ 486,400,000 |  | $ 364,400,000
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 |  | 136,900,000 |  |  |  |  | 136,900,000 |  |
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 |  |  |  |  |  |  |  |  | 134,900,000
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 |  | $ 349,500 |  |  |  |  | $ 349,500 |  | $ 229,500,000

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