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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged as collateral | $ 4,450,000,000 |  |  |  |  | $ 4,040,000,000.00
Loans held-for-sale | 0 |  |  |  |  | 0
Allowance For Credit Losses, net | 4,000 |  |  |  |  |
Allowance for Credit Losses | 82,800,000 |  |  |  |  | 86,800,000
Reserve for credit risk for undisbursed commitments | 7,000,000 |  |  |  |  | 7,500,000
Increase in reserve for unfunded loan commitments | 500,000,000 | $ 900,000,000 |  |  |  |
Allowance For Credit Losses Increase Decrease |  |  |  |  |  | 4,000
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total |  |  |  |  |  | 4,000
Allowance For Credit Losses Write Offs | 7,000,000 |  |  |  |  |
Financing Receivable, Modified, Accumulated | $ 26,363,000 | 3,307,000 |  |  |  |
GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  | 1.00% |
Unemployment [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  | 6.00% |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 80.45% |  |  |  |  |
Notes receivable gross | $ 6,664,925,000 |  |  |  |  | 6,784,505,000
Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 76.77% |  |  |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | $ 3,647,000 | 1,000,000 |  |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 11,896,000 | $ 1,579,000 |  |  |  |
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 16,900,000 |  |  |  |  |
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] | Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 2,100,000 |  |  |  |  |
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 8,800,000 |  |  |  |  |
Loans Secured by Dairy & Livestock Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 6,000,000 |  |  |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 350,600,000 |  |  |  |  | 412,900,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 304,100,000 |  |  |  |  | 374,900,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 46,500,000 |  |  |  |  | $ 38,000,000
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) |  | 7.20% |  |  |  | 7.34%
Notes receivable gross | 480,100,000 |  |  |  |  | $ 497,700,000
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 360,100,000 |  |  |  |  |
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 | $ 120,000,000 |  |  |  |  | 122,400,000
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 |  |  |  |  |  | $ 375,300,000
Maximum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  |  |  | 0.98%
Maximum [Member] | GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 2.78% |  |  |
Minimum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 0.95% |  |  |  |  |
Minimum [Member] | GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 1.90% |  |

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