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Provision for unfunded commitments during the period, representing either increases or decreases.

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Loans receivable percentage of portfolio.

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Percentage of increase decrease in macro economic factors.

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Purchased credit deteriorated (PCD) loans.

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Reserve for undisbursed commitments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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Amount of increase in allowance for credit loss on net investment in sales-type and direct financing leases, from recovery.

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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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