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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) commitment	Sep. 30, 2022 USD ($) commitment loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2022 USD ($) loan commitment	Sep. 30, 2021 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($) commitment	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest	$ 92,000,000	$ 92,000,000		$ 92,000,000			$ 81,600,000
Loans receivable, excluding accrued interest	15,201,267,000	15,201,267,000		$ 15,201,267,000			14,414,827,000
Loans held for sale, average life from purchase to sale				30 days
Loans and leases receivable	12,607,742,000	12,607,742,000		$ 12,607,742,000			9,018,298,000
Interest income		200,457,000	$ 233,097,000	526,573,000	$ 538,822,000
Allowance for credit loss, excluding accrued interest	130,197,000	130,197,000	$ 131,496,000	130,197,000	$ 131,496,000	$ 156,530,000	137,804,000	$ 125,436,000	$ 144,176,000
Allowance for credit loss, period increase				7,600,000
Loans reported as TDR	16,900,000	16,900,000		$ 16,900,000			16,500,000
Minimum performance requirement (months)				6 months
Lease receivable, TDR	$ 0	$ 0		$ 0			$ 0
Number of loans | loan		71	43	184	174
Number of commitments to lend additional funds (commitment) | commitment	0	0		0			0
Proceeds from sales of loans and leases	$ 100,700,000			$ 136,920,000	$ 260,851,000
Asset Pledged as Collateral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases receivable	6,600,000,000	$ 6,600,000,000		$ 6,600,000,000			$ 3,700,000,000
Forgiveness of debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan		0	0	0	0
Troubled Debt Restructurings
Financing Receivable, Troubled Debt Restructuring [Line Items]
Impairment modification minimum period (months)				9 months
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases receivable	1,200,000,000	$ 1,200,000,000		$ 1,200,000,000			3,300,000,000
Interest income		14,700,000	$ 117,100,000	72,100,000	$ 197,100,000
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable, excluding accrued interest	$ 32,000,000	$ 32,000,000		$ 32,000,000			$ 38,900,000

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