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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) |  | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jan. 07, 2022 | Dec. 31, 2028 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2027
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  | 0.94% | 0.98% |  |
Loan pledged as collateral |  |  |  | $ 4,440,000,000 | $ 4,040,000,000.00 |  |
Loans held-for-sale |  |  |  | 0 | 0 |  |
Allowance for credit losses | $ 4,900,000 |  |  | 80,100,000 | 86,800,000 |  |
Reserve for credit risk for undisbursed commitments |  |  |  | 6,300,000 | 7,500,000 |  |
Purchased Credit Deteriorated (PCD) Loans | $ 8,600,000 |  |  |  |  |  |
(Recapture of) provision for unfunded loan commitments |  |  |  | 1,250,000 | 500,000 | $ 0 |
Allowance For Credit Losses Increase Decrease |  |  |  | 6,700,000 | 1,700,000 |  |
Allowance for charge-offs |  |  |  | 3,700,000 | 300,000 |  |
Allowance For Credit Losses Write Offs |  |  |  | 6,300,000 |  |  |
Provision for credit losses |  |  |  | $ 3,000,000 | 2,000,000 | 10,600,000 |
GDP [Member] | Forecast [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  |  |  |  | 2.00%
Unemployment [Member] | Forecast [Member] | Minimum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 5.00% |  |  |  |
Unemployment [Member] | Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  | 5.00% |  |  |  |  |
Suncrest Member |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Recovery |  |  |  |  |  | 893,000 |
Purchased Credit Deteriorated (PCD) Loans |  |  |  |  |  | 8,600,000 |
Allowance For Credit Losses Increase Decrease |  |  |  |  |  | 20,100,000 |
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) |  |  |  | 79.57% |  |  |
Notes receivable gross |  |  |  | $ 6,507,452,000 | 6,784,505,000 |  |
Construction [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  | 76.23% |  |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  | $ 419,900,000 |  |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  | 385,300,000 | 374,900,000 |  |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Notes receivable gross |  |  |  | $ 34,600,000 | $ 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) |  |  |  | 6.91% | 7.34% |  |
Notes receivable gross |  |  |  | $ 449,800,000 | $ 497,700,000 |  |
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 |  |  |  | 109,100,000 |  |  |
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 |  |  |  |  | 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 |  |
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 |  |  |  | $ 340,700,000 |  |  |

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