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Loans and Leases Receivable and Allowance for Credit Losses - Additional Information (Detail)				3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) Commitment	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) Loan	Mar. 31, 2020 USD ($) Loan Commitment	Mar. 31, 2019 USD ($) Loan	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest receivable	$ 40,570,000		$ 38,072,000	$ 40,570,000		$ 38,072,000
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value			2,245,758,000			2,245,758,000
Loans receivable	9,721,991,000		9,508,367,000	$ 9,721,991,000		9,508,367,000
Loans held for sale, average life from purchase to sale				30 days
Interest income				$ 200,000	$ 200,000
Allowance for credit loss, period increase				13,100,000
Loans reported as TDR	13,500,000		13,300,000	$ 13,500,000		13,300,000
Minimum performance requirement				9 months
Lease receivable, TDR	$ 0		0	$ 0		0
Number of commitments to lend additional funds (commitment) | Commitment	0			0
Number of loans | Loan				6	6
Purchased-credit-impaired loans	$ 16,600,000					17,488,000
Loans pledged as collateral	4,100,000,000		4,600,000,000	$ 4,100,000,000		4,600,000,000
Accounting Standards Update 2016-13
Financing Receivable, Troubled Debt Restructuring [Line Items]
Initial allowance on loans purchased with credit deterioration		$ 200,000
Financing receivable, purchased with credit deterioration, discount		$ 300,000
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Residential real estate held in other real estate owned	100,000		200,000	100,000		200,000
Loans in process of foreclosure	900,000		$ 900,000	$ 900,000		900,000
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan			0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan				0	1
Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Purchased-credit-impaired loans						1,688,000
Other Assets
Financing Receivable, Troubled Debt Restructuring [Line Items]
Accrued interest receivable	36,300,000		$ 34,800,000	$ 36,300,000		$ 34,800,000
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	56,500,000			56,500,000
Commercial Real Estate | Commercial real estate non-owner occupied | Collateral Dependent Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans and leases receivable, net of allowance for loan losses, Estimated Fair Value	$ 19,100,000			$ 19,100,000

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