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Loans receivable percentage of portfolio.

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Reserve for undisbursed commitments.

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Total financing receivable, past due

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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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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended	24 Months Ended	33 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2027	Dec. 31, 2028
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	1.04%		1.04%		0.89%
Notes receivable gross	$ 12,122,015		$ 12,122,015		$ 8,699,193
Loans pledged as collateral	7,600,000		7,600,000		6,470,000
Factored Receivables	108,800		108,800
Loans held-for-sale	0		0		0
Allowance for Credit Losses	125,600		125,600		77,200
Reserve for credit risk for undisbursed commitments	13,000		13,000		8,300
Allowance For Unfunded Commitment	4,300		4,300
Provision for unfunded loan commitments	0	$ (500,000)	4,750	$ 1,000
Allowance For Credit Losses Increase Decrease			48,400		48,400
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total			48,400		48,400
Amortized cost	$ 3,943,220		$ 3,943,220		2,982,228
Financing Receivable, Modified, Accumulated		$ 10,756		$ 10,756
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)	77.30%		77.30%
Notes receivable gross	$ 9,032,741		$ 9,032,741		6,574,395
Loan Defaulted within Period	12 months	12 months	12 months	12 months
Financing Receivable Past Due	$ 0		$ 0
Amortized cost		$ 244,300		$ 244,300
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	74.50%		74.50%
Notes receivable gross	$ 229,046		$ 229,046		37,812
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	341,800		341,800		431,600
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	300,900		300,900		386,100
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 40,900		$ 40,900		$ 45,500
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)	4.80%		4.80%		6.50%
Notes receivable gross	$ 430,500		$ 430,500		$ 424,500
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	123,000		123,000		119,000
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	$ 307,500		$ 307,500		$ 305,500
Minimum [Member] \| Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors							5.00%