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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2027	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0					$ 0
Allowance for Credit Losses	82,900,000					86,800,000
Reserve for credit risk for undisbursed commitments	6,300,000					7,500,000
Increase in reserve for unfunded loan commitments	1,300,000	$ 0
Allowance For Credit Losses Increase Decrease		$ 3,900,000				3,900,000
Allowance For Credit Losses Write Offs	6,300,000
Loan Pledged As Collateral	$ 4,320,000,000					4,040,000,000.00
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	80.50%
Notes receivable gross	$ 6,618,637,000					$ 6,784,505,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.21%
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	0.97%
Minimum \| GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				1.40%	1.00%
Minimum \| Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					5.50%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)						0.98%
Maximum \| GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			1.90%
Maximum \| Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			5.50%
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 342,400,000					$ 412,900,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	298,300,000					374,900,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 44,100,000					$ 38,000,000
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)	6.96%					7.34%
Notes receivable gross	$ 460,700,000					$ 497,700,000
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	121,900,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Dairy & Livestock Land [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross						122,400,000
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						$ 375,300,000
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	$ 338,800