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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail)					3 Months Ended						9 Months Ended
	Sep. 30, 2018 USD ($) Commitment Loan	Jun. 30, 2018 USD ($) Loan	Dec. 31, 2017 USD ($) Loan	Jun. 30, 2017 USD ($) Loan	Sep. 30, 2018 USD ($) Allowance Commitment Loan	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($) Allowance Loan	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) Commitment Loan	Sep. 30, 2017 USD ($) Allowance Loan
Financing Receivable, Modifications [Line Items]
Loans held for sale, average life from purchase to sale											25 days
Number of Loans | Loan					8			4			33	36
Funds for reimbursement	$ 500,000		$ 600,000		$ 500,000						$ 500,000
Loans reported as TDR	$ 19,400,000		20,400,000		$ 19,400,000						$ 19,400,000
Minimum performance requirement											6 months
Number of commitments to lend additional funds (commitment) | Commitment	0				0						0
Loans modified as TDR allowance (allowance) | Allowance					0			0				0
Residential mortgage loans acquired												$ 0
Loans receivable, net of allowance for loan losses	$ 8,715,536,000		8,523,651,000		$ 8,715,536,000						$ 8,715,536,000
Proceeds from sales of loans											42,211,000	124,703,000
Purchase of loans								$ 0			347,740,000	262,641,000
Gain on sale of SBA and other loans					1,096,000			$ 1,144,000			3,404,000	3,045,000
Term of fixed rate residential mortgage loans								30 years	30 years	30 years
Purchase price as a percentage of loans outstanding						100.40%			101.00%	98.50%
Mortgage and Consumer Loans
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses	72,700,000				$ 72,700,000						72,700,000
Purchase price as a percentage of loans outstanding					95.30%
Residential real estate
Financing Receivable, Modifications [Line Items]
Residential real estate held in other real estate owned	400,000		300,000		$ 400,000						400,000
Loans in process of foreclosure	$ 2,100,000		$ 1,600,000		2,100,000						2,100,000
Loans receivable, net of allowance for loan losses		$ 277,400,000				$ 277,400,000
Term of fixed rate residential mortgage loans						30 years
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan	1		1
Loans modified as TDR	$ 1,500,000		$ 2,100,000
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan		0		10
Loans modified as TDR												$ 500,000
Loans modified as TDR allowance (allowance) | Allowance												1
Allowance for credit losses, effect of change in method												$ 1,000
Small Business Administration Loan
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses	12,100,000	$ 11,700,000		$ 7,000,000	12,100,000	$ 11,700,000	$ 15,000,000	$ 11,000,000	$ 7,000,000	$ 8,700,000	12,100,000	$ 11,000,000
Gain on sale of SBA and other loans					1,100,000	$ 900,000	$ 1,400,000	$ 1,100,000	600,000	800,000
Residential Mortgage Loan Commitments
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses				$ 90,000,000					$ 90,000,000	174,200,000
Multi-family
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses										94,900,000
Proceeds from sales of loans										95,400,000
Gain on sale of SBA and other loans										$ 500,000
Federal Home Loan Bank of Pittsburgh
Financing Receivable, Modifications [Line Items]
Loans pledged as collateral	$ 5,500,000,000		$ 5,500,000,000		$ 5,500,000,000						$ 5,500,000,000
Forgiveness of debt
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan					0			0			0	0

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