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Provision for unfunded commitments during the period, representing either increases or decreases.

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Loan Pledged As Collateral

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Loans receivable percentage of portfolio.

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Reserve for undisbursed commitments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		24 Months Ended	33 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2027	Dec. 31, 2028	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	1.05%		1.05%				0.89%
Notes receivable gross	$ 12,017,055,000		$ 12,017,055,000				$ 8,699,193,000
Loans pledged as collateral	7,560,000,000		7,560,000,000				6,470,000,000
Factored Receivables	106,800,000		106,800,000
Loans held-for-sale	0		0				0
Allowance for Credit Losses	126,700,000		126,700,000				77,200,000
Reserve for credit risk for undisbursed commitments	13,000,000		13,000,000				8,300,000
Provision for unfunded loan commitments	4,300,000	$ 0	4,750,000	$ 500,000
Allowance For Credit Losses Increase Decrease			49,500,000
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total			49,500,000
Amortized cost	$ 3,777,744,000		$ 3,777,744,000				2,982,228,000
Financing Receivable, Modified, Accumulated		$ 9,529,000		$ 9,529,000
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					2.00%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					5.00%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.60%		77.60%
Notes receivable gross	$ 8,983,934,000		$ 8,983,934,000				6,574,395,000
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	74.80%		74.80%
Notes receivable gross	$ 209,993,000		$ 209,993,000				37,812,000
Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	1,000,000		1,000,000
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	1,700,000		1,700,000
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	2,700,000		2,700,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	281,000,000		281,000,000				431,600,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	239,100,000		239,100,000				386,100,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 41,900,000		$ 41,900,000				$ 45,500,000
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)	4.70%		4.70%				6.46%
Notes receivable gross	$ 418,300,000		$ 418,300,000				$ 424,500,000
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	124,400,000		124,400,000				119,000,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Agricultural Land [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 293,800,000		$ 293,800,000				$ 305,500,000
Minimum [Member] \| Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors						5.00%