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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) commitment loan	Jun. 30, 2021 USD ($) loan	Jun. 30, 2022 USD ($) commitment loan	Jun. 30, 2021 USD ($) loan	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) commitment	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest	$ 86,100,000		$ 86,100,000			$ 81,600,000
Loans receivable, excluding accrued interest	15,501,228,000		$ 15,501,228,000			14,414,827,000
Loans held for sale, average life from purchase to sale			30 days
Loans and leases receivable	12,212,995,000		$ 12,212,995,000			9,018,298,000
Interest income	168,941,000	$ 153,608,000	326,116,000	$ 305,725,000
Allowance for credit loss, excluding accrued interest	156,530,000	$ 125,436,000	156,530,000	$ 125,436,000	$ 145,847,000	137,804,000	$ 128,736,000	$ 144,176,000
Allowance for credit loss, period increase			18,700,000
Loans reported as TDR	16,800,000		$ 16,800,000			16,500,000
Minimum performance requirement (months)			6 months
Lease receivable, TDR	$ 0		$ 0			$ 0
Number of loans | loan	71	103	113	131
Number of commitments to lend additional funds (commitment) | commitment	0		0			0
Asset Pledged as Collateral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases receivable	$ 4,000,000,000		$ 4,000,000,000			$ 3,700,000,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases receivable	1,600,000,000		1,600,000,000			3,300,000,000
Interest income	$ 20,600,000	$ 41,100,000	$ 57,500,000	$ 79,900,000
Troubled Debt Restructurings
Financing Receivable, Troubled Debt Restructuring [Line Items]
Impairment modification minimum period (months)			9 months
Forgiveness of debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	0	0	0	0
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable, excluding accrued interest	$ 17,200,000		$ 17,200,000			$ 38,900,000

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