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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 ($) | Mar. 31, 2022 USD ($) Loan | Mar. 31, 2021 USD ($) Loan | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank |  | $ 4,090,000,000.00 |  |  |  |  | $ 3,960,000,000
Loans held-for-sale |  | 0 |  |  |  |  | 0
Impaired, at carrying value |  | 5,300,000 |  |  |  |  |
Allowance for Credit Losses | $ (4,900,000) | (76,100,000) |  |  |  |  | (65,000,000.0)
Net charge-offs |  | 5,000 | $ 2,400,000 |  |  |  |
Reserve for credit risk for undisbursed commitments |  | 8,000,000.0 |  |  |  |  | 8,000,000.0
Allocation of allowance to troubled debt restructuring |  | 0 |  |  |  |  | $ 0
Increase in reserve for unfunded loan commitments |  | 0 | $ 0 |  |  |  |
Allowance For Credit Losses Increase Decrease |  | 11,100,000 |  |  |  |  |
Provision For Credit Losses |  | $ 2,500,000 |  |  |  |  |
Recapture of provision for credit losses | 2,400,000 |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Loan |  | 0 | 0 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 0.90% |  |  |  |  | 0.84%
Minimum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 0.89% |  |  |  |  | 0.82%
GDP [Member] | Forecast [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 3.00% | 1.30% | 2.60% |
Unemployment [Member] | Forecast [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 4.70% | 5.20% | 4.30% |
Suncrest Bank [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
PCD Loans | 8,600,000 | $ 8,600,000 |  |  |  |  |
Provision For Credit Losses | $ 2,500,000 |  |  |  |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 79.14% |  |  |  |  |
Notes receivable gross |  | $ 6,470,841,000 |  |  |  |  | $ 5,789,730,000
Construction [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 75.32% |  |  |  |  |
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 |  | 1,900,000 |  |  |  |  |
Performing Financing Receivable [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  | 2,400,000 |  |  |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  | 292,800,000 |  |  |  |  | 386,200,000
Allowance for Credit Losses |  | (121,200,000) |  |  |  |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  | 241,700,000 |  |  |  |  | 351,700,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  | $ 51,100,000 |  |  |  |  | $ 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) |  | 7.80% |  |  |  |  | 6.29%
Notes receivable gross |  | $ 504,500,000 |  |  |  |  | $ 364,400,000
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 |  | 134,500,000 |  |  |  |  | 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 |  | $ 370,000,000.0 |  |  |  |  | $ 229,500,000

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