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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		$ 4,240,000				$ 4,040,000
Financing Receivable, Modified, Accumulated		10,765				5,836
Loans held-for-sale		0				0
Allowance for Credit Losses		82,800				86,800
Reserve for credit risk for undisbursed commitments		7,500				7,500
Increase in reserve for unfunded loan commitments		500,000	$ 500,000
Allowance For Credit Losses Increase Decrease						$ 4,000
Allowance For Credit Losses Write Offs		$ 7,500
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		0.94%				0.97%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					2.00%
GDP [Member] \| Forecast [Member] \| Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				2.50%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors	6.00%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		80.44%
Notes receivable gross		$ 6,720,538				$ 6,784,505
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		76.62%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated		$ 350,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated		3,152				1,587
Loans Secured by Dairy & Livestock Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated		962,000
Modifications of Loans To Borrowers Experiencing Financial Difficulty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated		1,300
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		351,600				412,900
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		308,500				374,900
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 43,100				$ 38,000
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)		7.41%				7.34%
Notes receivable gross		$ 498,200				$ 497,700
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		121,400
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 376,800
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						122,400
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