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Loans and Leases Receivable and Allowance for Credit Losses - Additional Information (Detail)			3 Months Ended
	Mar. 31, 2021 USD ($) Commitment	Dec. 31, 2020 USD ($) Commitment	Mar. 31, 2021 USD ($) Commitment Loan	Mar. 31, 2020 USD ($) Loan	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest receivable	$ 83,186,000	$ 80,412,000	$ 83,186,000
Loans receivable	15,993,464,000	15,608,989,000	15,993,464,000
Interest income			$ 152,117,000	$ 116,080,000
Loans held for sale, average life from purchase to sale			30 days
Accrued interest reversed			$ 16,000	1,200,000
Allowance for credit losses on loans and leases	128,736,000	144,176,000	128,736,000	$ 149,283,000	$ 56,379,000
Allowance for credit loss, period decrease			15,500,000
Loans reported as TDR	16,000,000.0	16,100,000	$ 16,000,000.0
Minimum performance requirement (months)			6 months
Lease receivable, TDR	$ 0	$ 0	$ 0
Number of loans | Loan			28	16
Number of commitments to lend additional funds (commitment) | Commitment	0	0	0
Purchased-credit-impaired loans	$ 12,500,000	$ 13,400,000
Financing receivable sale			$ 39,534,000	$ 1,822,000
Loans pledged as collateral	6,800,000,000	8,500,000,000	$ 6,800,000,000
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]
Loans receivable	5,200,000,000		$ 5,200,000,000
Interest income			38,800,000	0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable sale			18,931,000	0
Commercial real estate non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amount deferred, CARES Act	176,100,000		176,100,000
Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for credit losses on loans and leases	8,026,000	12,620,000	8,026,000	$ 8,750,000	$ 6,157,000
Consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amount deferred, CARES Act	13,000,000.0		$ 13,000,000.0
Forgiveness of debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan			0	0
Other Assets
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest receivable	79,300,000	76,600,000	$ 79,300,000
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	38,800,000		38,800,000
Government-Guaranteed Collateral | Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans pledged as collateral	$ 3,300,000,000	$ 4,600,000,000	$ 3,300,000,000

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