Allocation of reserves to troubled debt restructuring.

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

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Loans classified as a troubled debt restructured.

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Loans receivable percentage of portfolio.

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Percentage of increase decrease in macro economic factors.

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Recapture of provision of credit losses.

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Remaining outstanding balance of ppp loans

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Reserve for undisbursed commitments.

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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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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended					9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Loan	Sep. 30, 2020 USD ($) Loan	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)			0.83%		1.12%	0.83%	1.12%	1.12%
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank			$ 6,260,000,000			$ 6,260,000,000		$ 6,070,000,000.00
Loans held-for-sale			0			0		0
Impaired, at carrying value			8,000,000.0			8,000,000.0
Allowance for Credit Losses			65,400,000			65,400,000
Reserve for credit risk for undisbursed commitments			8,000,000.0			8,000,000.0		9,000.0
Allocation of allowance to troubled debt restructuring			0			0		0
Increase in reserve for unfunded loan commitments			$ 0	$ 1,000,000.0	$ 0	1,000,000	$ 0
Percentage of Increase Decrease In Macro Economic Factors			5.70%
Allowance For Credit Losses Increase Decrease						4,000,000.0
Recapture of provision for credit losses				$ 2,000,000.0		$ 4,000,000.0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Loan						0	0
Remaining Outstanding Balance Of PPP Loans			$ 331,000,000.0			$ 331,000,000.0
Due To Forecast Of Severe Economic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision For Credit Losses							$ 23,500,000
Recapture of provision for credit losses						$ 25,500,000
Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors	5.30%	5.60%
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			5.70%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors	2.00%	2.00%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)			76.99%			76.99%
Notes receivable gross			$ 5,734,699,000			$ 5,734,699,000		5,501,509,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)			73.06%			73.06%
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured			$ 1,000,000.0			$ 1,000,000.0
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured			4,300,000			4,300,000
Performing Financing Receivable [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured			2,600,000			2,600,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			279,600,000			279,600,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			242,000,000.0			242,000,000.0		320,100,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			$ 37,600,000			$ 37,600,000		$ 41,000,000.0
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)			6.18%			6.18%		5.72%
Notes receivable gross			$ 354,300,000			$ 354,300,000		$ 314,400,000
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			125,100,000			125,100,000		132,900,000
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			$ 229,200,000			$ 229,200,000		$ 181,500,000