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Reserve for undisbursed commitments.

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

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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)		12 Months Ended
	Jan. 07, 2022 USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022 USD ($) Contract	Dec. 31, 2021 USD ($) Contract	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)					0.94%	0.82%
Notes receivable gross					$ 9,073,571,000
Loans pledged as collateral					4,300,000,000	$ 3,960,000,000
Loans held-for-sale					0	0
Impaired, at carrying value					7,800,000
Allowance for Credit Losses	$ 4,900,000				85,100,000	65,000,000.0
Reserve for credit risk for undisbursed commitments					8,000,000.0	8,000,000.0
Purchased Credit Deteriorated (PCD) Loans	$ 8,600,000
(Recapture of) provision for unfunded loan commitments					0	$ (1,000,000)	$ 0
Allowance For Credit Losses Increase Decrease					20,100,000
Allowance For Credit Losses Write Offs					8,000,000.0
Provision For Credit Losses					$ 10,500,000
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted \| Contract					0	0
Allocation of allowance to troubled debt restructuring					$ 0	$ 0
Transition adjustment, allowance for credit loses for loans					1,800,000
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		2.80%	1.30%	0.30%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		4.50%	5.10%	4.80%
Suncrest Member
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recovery					893,000
Purchased Credit Deteriorated (PCD) Loans					8,600,000
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)					79.73%
Notes receivable gross					$ 6,884,948,000	5,789,730,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)					75.83%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross					$ 947,365,000
Loans Secured by Dairy & Livestock Land [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured					2,000,000.0
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					4,800,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross					433,600,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross					388,500,000	351,700,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross					$ 45,100,000	$ 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)					7.52%	6.29%
Notes receivable gross					$ 517,800,000	$ 364,400,000
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					140,500,000	134,900,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross					$ 377,300,000	$ 229,500,000