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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)	6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) Loan	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2022 USD ($) Loan	Mar. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 4,290,000,000				$ 4,300,000,000
Net charge-offs	150,000
Loans held-for-sale	0				0
Impaired, at carrying value					7,800,000
Allowance for Credit Losses	87,000,000				85,100,000
Reserve for credit risk for undisbursed commitments	8,900,000				8,000,000
Allocation of allowance to troubled debt restructuring		$ 0			0
Increase in reserve for unfunded loan commitments	900,000	$ 0
Allowance For Credit Losses Increase Decrease	2,000,000				$ 1,900,000
Allowance For Credit Losses Write Offs	$ 8,900,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Loan		0			0
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors	1.50%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			2.00%	0.80%
Unemployment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors	3.80%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			5.00%	5.00%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	81.24%
Notes receivable gross	$ 6,904,095,000				$ 6,884,948,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.51%
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	$ 298,200,000				433,600,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	252,500,000				$ 388,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 45,700,000					$ 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)	7.50%				7.52%
Notes receivable gross	$ 517,600,000				$ 517,800,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	381,800,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Dairy & Livestock Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 135,800,000				140,500,000
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					$ 377,300,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)					0.94%
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	0.98%