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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 07, 2022	Sep. 30, 2026	Mar. 31, 2025	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)							0.98%	0.94%
Loans pledged as collateral							$ 4,040,000,000.00	$ 4,300,000,000
Loans held-for-sale							0	0
Impaired, at carrying value							7,800,000
Allowance for Credit Losses	$ 4,900,000						86,800,000	85,100,000
Reserve for credit risk for undisbursed commitments							7,500,000	8,000,000
Purchased Credit Deteriorated (PCD) Loans	$ 8,600,000
(Recapture of) provision for unfunded loan commitments							(500,000)	0	$ (1,000,000)
Allowance For Credit Losses Increase Decrease							2,000,000	1,700,000
Allowance for Loan and Lease Losses, Writeoff, Net							$ 275,000
Allowance For Credit Losses Write Offs								7,500,000
Provision For Credit Losses								10,500,000
Allocation of allowance to troubled debt restructuring								0
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				2.60%	0.92%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		5.00%	5.70%			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)							79.97%
Notes receivable gross							$ 6,784,505,000	6,884,948,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)							76.19%
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
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
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							$ 412,900,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross							374,900,000	388,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross							$ 38,000,000	$ 45,100,000
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)							7.34%	7.52%
Notes receivable gross							$ 497,700,000	$ 517,800,000
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							122,400,000	140,500,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross							$ 375,300,000	$ 377,300,000