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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended | 30 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2026 | Jun. 30, 2026 | Dec. 31, 2024 | Dec. 31, 2027
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | $ 8,358,501,000 |  |  |  | $ 8,536,432,000 |
Loans pledged as collateral | 4,480,000,000 |  |  |  | 4,440,000,000 |
Carrying value of loans | 6,310,000,000 |  |  |  | 6,310,000,000 |
Loans held-for-sale | 0 |  |  |  | 0 |
Allowance for Credit Losses |  | $ 78,000,000 |  |  | 80,100,000 |
Allowance for charge-offs | 100,000 |  |  |  |  |
Reserve for credit risk for undisbursed commitments | 6,800,000 |  |  |  | 6,300,000 |
Increase in reserve for unfunded loan commitments | 500,000 | $ 500,000 |  |  |  |
Allowance For Credit Losses Increase Decrease |  |  |  |  | 2,100,000 |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total |  |  |  |  | 2,100,000 |
Allowance For Credit Losses Write Offs | 6,800,000 |  |  |  |  |
Financing Receivable, Modified, Accumulated | 9,529,000 |  |  |  | 6,467,000 |
Recapture of provision for credit losses | $ 2,000,000 |  |  |  |  |
Unemployment [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 5.00% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 81.64% |  |  |  |  |
Notes receivable gross | $ 6,517,415,000 |  |  |  | 6,507,452,000 |
Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 78.00% |  |  |  |  |
Notes receivable gross | $ 17,658,000 |  |  |  | 16,082,000 |
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 6,100,000 |  |  |  |  |
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 5,700,000 |  |  |  |  |
Loans Secured by Dairy & Livestock Land [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, Modified, Accumulated | 400,000 |  |  |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 233,800,000 |  |  |  | 419,900,000 |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | 199,400,000 |  |  |  | 385,300,000 |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross | $ 34,400,000 |  |  |  | $ 34,600,000 |
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) | 6.40% |  |  |  | 6.91% |
Notes receivable gross | $ 417,200,000 |  |  |  | $ 449,800,000 |
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 | 104,600,000 |  |  |  | 109,100,000 |
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 | $ 312,600,000 |  |  |  | $ 340,700,000 |
Maximum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  |  | 0.94% |
Maximum [Member] | GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  |  | 2.00%
Minimum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) | 0.93% |  |  |  |  |
Minimum [Member] | GDP [Member] | Forecast [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 1.00% |  |

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