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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended	27 Months Ended	39 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2026	Dec. 31, 2027	Dec. 31, 2028	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 8,470,906,000	$ 8,470,906,000					$ 8,536,432,000
Loans pledged as collateral	4,480,000,000	4,480,000,000					4,440,000,000
Carrying value of loans	6,430,000,000	6,430,000,000					6,430,000,000
Loans held-for-sale	0	0					0
Allowance for Credit Losses	79,300,000	79,300,000					80,100,000
Allowance for charge-offs		1,000,000
Reserve for credit risk for undisbursed commitments	7,300,000	7,300,000					6,300,000
Provision for (recapture of) unfunded loan commitments		(1,000,000)	$ 1,250,000
Allowance For Credit Losses Increase Decrease		800,000
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total		800,000
Allowance For Credit Losses Write Offs		7,300,000
Financing Receivable, Modified, Accumulated	$ 10,756,000	10,756,000					6,467,000
Recapture of provision for credit losses		$ 200,000
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)	80.59%	80.59%
Notes receivable gross	$ 6,535,319,000	$ 6,535,319,000					6,507,452,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.20%	77.20%
Notes receivable gross	$ 29,976,000	$ 29,976,000					16,082,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Defaulted within Period	12 months	12 months
Financing Receivable Past Due	$ 244,300	$ 244,300
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	10,800,000	10,800,000
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	1,900,000	1,900,000
Modifications Of Loans To Borrowers Experiencing Financial Difficulty [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	400,000	400,000
Loans Secured by Dairy & Livestock Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modified, Accumulated	395,000,000	395,000,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	293,000,000	293,000,000					419,900,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	246,700,000	246,700,000					385,300,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 46,200,000	$ 46,200,000					$ 34,600,000
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)	6.30%	6.30%					6.91%
Notes receivable gross	$ 411,400,000	$ 411,400,000					$ 449,800,000
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	102,000,000	102,000,000					109,100,000
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	$ 309,400,000	$ 309,400,000					$ 340,700,000
Maximum [Member] | GDP [Member] | Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors						2.00%
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	0.94%	0.94%
Minimum [Member] | GDP [Member] | Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					1.50%
Minimum [Member] | Unemployment [Member] | Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors						5.00%

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