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

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Recapture of provision of credit losses.

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Reserve for undisbursed commitments.

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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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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	May 06, 2021	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)				0.87%	1.11%	1.12%
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank				$ 6,070,000,000.00		$ 6,070,000,000.00
Loans held-for-sale				0		0
Impaired, at carrying value				5,800,000
Allowance for Credit Losses				71,800,000
Reserve for credit risk for undisbursed commitments				9,000,000.0		9,000,000.0
Allocation of allowance to troubled debt restructuring				0		0
Increase in reserve for unfunded loan commitments				$ 0	$ 0
Percentage of Increase Decrease In Macro Economic Factors		5.50%	6.30%	6.40%
Allowance For Credit Losses Increase Decrease				$ 21,900,000
Allowance For Credit Losses Write Offs				2,400,000
Recapture of provision for credit losses				19,500,000
Due To Forecast Of Severe Economic Dowturn [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision For Credit Losses				$ 12,000,000.0
Subsequent Event [Member] \| Due To Forecast Of Severe Economic Dowturn [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision For Credit Losses	$ 11,500,000
Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			3.20%
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				4.00%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		2.80%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)				71.73%
Notes receivable gross				$ 5,596,781,000		5,501,509,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)				67.49%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance For Credit Losses Increase Decrease				$ 18,900,000
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured				1,000,000.0
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured				4,500,000
Performing Financing Receivable [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured				294,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross				261,100,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross				229,100,000		320,100,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross				$ 31,900,000		$ 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)				5.85%		5.72%
Notes receivable gross				$ 327,400,000		$ 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				129,200,000		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				$ 198,100,000		$ 181,500,000