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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail)		3 Months Ended						9 Months Ended
	Jul. 11, 2016 USD ($)	Sep. 30, 2017 USD ($) Allowance Commitment Loan	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($) Allowance Loan	Jun. 30, 2016 USD ($) Loan	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($) Allowance Commitment Loan	Sep. 30, 2016 USD ($) Allowance Loan	Dec. 31, 2016 USD ($) Commitment
Financing Receivable, Modifications [Line Items]
Funds for reimbursement		$ 700,000						$ 700,000		$ 1,000,000
Loans reported as TDR		$ 20,800,000						$ 20,800,000		$ 16,400,000
Minimum performance requirement								6 months
Sustained performance period								9 months
Number of commitments to lend additional funds (commitment) | Commitment		0						0		0
Loans modified as TDR allowance (allowance) | Allowance		0			1				0
Number of Loans | Loan		4			10			36	52
Payments for early termination of FDIC loss sharing agreement	$ 1,400,000
Residential mortgage loans acquired			$ 90,000,000	$ 174,200,000	$ 0				$ 0
Term of fixed rate residential mortgage loans			30 years	30 years
Purchase price as a percentage of loans outstanding			101.00%	98.50%
Loans receivable, net of allowance for loan losses		$ 7,023,024,000						$ 7,023,024,000		$ 6,117,322,000
Proceeds from sales of loans								124,703,000	91,868,000
Gain on sale of SBA and other loans		1,144,000			$ 1,206,000			3,045,000	$ 2,135,000
Number of loans sold | Loan					0
Residential real estate
Financing Receivable, Modifications [Line Items]
Residential real estate held in other real estate owned		300,000						300,000		500,000
Loans in process of foreclosure		1,500,000						$ 1,500,000		400,000
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan								1
Loans modified as TDR								$ 2,300,000
Commercial real estate - non-owner occupied
Financing Receivable, Modifications [Line Items]
Loans modified as TDR allowance (allowance) | Allowance								1
Allowance for credit losses, effect of change in method								$ 29,000
Loans receivable, net of allowance for loan losses						$ 5,700,000
Gain on sale of SBA and other loans						$ 100,000
Number of loans sold | Loan						1
Manufactured housing
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDR (loan) | Loan								10	5
Loans modified as TDR								$ 500,000	$ 100,000
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				$ 8,700,000		$ 3,600,000	$ 6,900,000
Gain on sale of SBA and other loans		1,100,000	$ 600,000	800,000		$ 400,000	$ 600,000
Multi-family
Financing Receivable, Modifications [Line Items]
Loans receivable, net of allowance for loan losses		$ 11,000,000	$ 7,000,000	94,900,000				11,000,000
Proceeds from sales of loans				95,400,000
Gain on sale of SBA and other loans				$ 500,000
Principal Forgiveness
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan		0			0
Federal Home Loan Bank of Pittsburgh
Financing Receivable, Modifications [Line Items]
Loans pledged as collateral		$ 5,500,000,000						$ 5,500,000,000		$ 4,800,000,000

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