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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) Loan	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0		$ 0					$ 0
Impaired, at carrying value								7,800,000
Allowance for Credit Losses	89,000,000		89,000,000					85,100,000
Reserve for credit risk for undisbursed commitments	8,000,000		8,000,000					8,000,000
Allocation of allowance to troubled debt restructuring		$ 0		$ 0				0
Increase in reserve for unfunded loan commitments	900,000	$ 0	0	$ 0
Allowance For Credit Losses Increase Decrease			4,000,000					$ 3,900,000
Allowance For Credit Losses Write Offs			8,000,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Loan				0				0
Loan Pledged As Collateral	$ 4,350,000,000		4,350,000,000					$ 4,300,000,000
Allowance for write off			$ 122,000
Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					5.70%	5.20%	3.80%
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors							2.10%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors					1.10%	0.30%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	80.81%		80.81%
Notes receivable gross	$ 6,843,059,000		$ 6,843,059,000					6,884,948,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	77.08%		77.08%
Loans Secured by Dairy & Livestock Land [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured								2,000,000
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured								1,000,000
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured								$ 4,800,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	1.00%		1.00%					0.94%
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 351,500,000		$ 351,500,000					$ 433,600,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	301,500,000		301,500,000					388,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross	$ 50,000,000		$ 50,000,000					$ 45,100,000
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)	7.44%		7.44%					7.52%
Notes receivable gross	$ 509,200,000		$ 509,200,000					$ 517,800,000
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	133,200,000		133,200,000
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								140,500,000
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								$ 377,300,000
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	$ 376,000		$ 376,000