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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Jan. 07, 2022 USD ($)	Mar. 31, 2023 USD ($) Loan	Mar. 31, 2022 USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2022 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 8,935,357,000
Loans pledged as collateral		4,320,000,000	$ 4,300,000,000
Loans held-for-sale		0				$ 0
Impaired, at carrying value						7,800,000
Allowance for Credit Losses	$ (4,900,000)	(86,500,000)				(85,100,000)
PCD Loans	$ 8,600,000
Net charge-offs		77,000
Reserve for credit risk for undisbursed commitments		8,500,000				8,000,000.0
Allocation of allowance to troubled debt restructuring			0			0
Increase in reserve for unfunded loan commitments		500,000	0
Allowance For Credit Losses Increase Decrease		1,500,000				$ 1,400,000
Allowance For Credit Losses Write Offs		$ 8,500,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Loan		0				0
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		0.97%				0.94%
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		1.40%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				2.40%	0.90%
Unemployment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		4.20%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				(4.80%)	5.10%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		81.59%
Notes receivable gross		$ 6,950,302,000				$ 6,884,948,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		77.72%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 896,117,000
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		307,800,000				433,600,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			261,300,000			$ 388,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 46,500,000	$ 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)		7.45%				7.52%
Notes receivable gross		$ 517,800,000				$ 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		138,400,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 379,400,000
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						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