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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, 2021 USD ($) Commitment	Dec. 31, 2020 USD ($) Commitment	Jun. 30, 2021 USD ($) Loan Commitment	Jun. 30, 2020 USD ($) Loan	Jun. 30, 2021 USD ($) Commitment Loan	Jun. 30, 2020 USD ($) Loan	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest	$ 85,400,000	$ 76,600,000	$ 85,400,000		$ 85,400,000
Loans receivable, excluding accrued interest	16,807,046,000	15,608,989,000	16,807,046,000		16,807,046,000
Loans receivable, PPP	6,305,056,000	4,561,365,000	6,305,056,000		6,305,056,000
Interest income			153,608,000	$ 118,447,000	$ 305,725,000	$ 234,527,000
Loans held for sale, average life from purchase to sale					30 days
Allowance for credit loss, excluding accrued interest	125,436,000	144,176,000	125,436,000	$ 159,905,000	$ 125,436,000	$ 159,905,000	$ 128,736,000	$ 149,283,000	$ 56,379,000
Allowance for credit loss, period decrease					18,800,000
Loans reported as TDR	16,800,000	16,100,000	16,800,000		$ 16,800,000
Minimum performance requirement (months)					6 months
Lease receivable, TDR	$ 0	$ 0	$ 0		$ 0
Number of loans | Loan			103	22	131	38
Number of commitments to lend additional funds (commitment) | Commitment	0	0	0		0
Purchased-credit-impaired loans	$ 11,700,000	$ 13,400,000
Loans pledged as collateral	7,100,000,000	8,500,000,000	$ 7,100,000,000		$ 7,100,000,000
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]
Interest income			41,100,000	$ 11,700,000	$ 79,900,000	$ 11,700,000
Commercial real estate non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amount deferred, CARES Act	89,800,000	202,100,000	89,800,000		89,800,000
Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit loss, excluding accrued interest	5,028,000	12,620,000	5,028,000	$ 14,697,000	5,028,000	$ 14,697,000	$ 8,026,000	$ 8,750,000	$ 6,157,000
Consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amount deferred, CARES Act	8,400,000	16,400,000	$ 8,400,000		$ 8,400,000
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	36,600,000	59,500,000	$ 36,600,000		$ 36,600,000
Government-Guaranteed Collateral | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans pledged as collateral	$ 3,900,000,000	$ 4,600,000,000	$ 3,900,000,000		$ 3,900,000,000

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