Business Combinations - Summary of Assets Acquired and Liabilities Assumed and Their Initial Fair Value Estimates (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Nov. 30, 2016	May 02, 2016	Mar. 11, 2016
Liabilities Assumed
Goodwill	$ 147,815	$ 145,064
Retail Branch
Business Acquisition [Line Items]
Cash and cash equivalents					$ 16,727
Loans					9
Other assets					15
Total assets acquired					16,817
Liabilities Assumed
Deposits					(16,957)
Other liabilities					(138)
Total liabilities assumed					(17,095)
Goodwill					278
Retail Branch | Core Deposits
Business Acquisition [Line Items]
Core deposit intangible					66
Cape Bancorp, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents				$ 30,025
Loans				1,156,807
Other assets				61,793
Total assets acquired				1,516,694
Liabilities Assumed
Deposits				(1,248,367)
Other liabilities				(12,223)
Total liabilities assumed				(1,385,056)
Goodwill				64,765
Ocean Shore Holdings Co.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 60,871
Loans			774,046
Other assets			35,364
Total assets acquired			994,691
Liabilities Assumed
Deposits			(875,073)
Other liabilities			(16,166)
Total liabilities assumed			(894,933)
Goodwill			80,974
Book Value | Retail Branch
Business Acquisition [Line Items]
Cash and cash equivalents					16,727
Loans					9
Other assets					15
Total assets acquired					16,751
Liabilities Assumed
Deposits					(16,953)
Other liabilities					(138)
Total liabilities assumed					(17,091)
Book Value | Cape Bancorp, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents				30,025
Loans				1,169,568
Other assets				61,793
Total assets acquired				1,520,516
Liabilities Assumed
Deposits				(1,247,688)
Other liabilities				(7,611)
Total liabilities assumed				$ (1,378,886)
Book Value | Ocean Shore Holdings Co.
Business Acquisition [Line Items]
Cash and cash equivalents			60,871
Loans			790,396
Other assets			35,369
Total assets acquired			999,466
Liabilities Assumed
Deposits			(874,301)
Other liabilities			(17,629)
Total liabilities assumed			$ (895,624)
Fair Value Adjustment | Retail Branch
Business Acquisition [Line Items]
Total assets acquired					66
Liabilities Assumed
Deposits					(4)
Total liabilities assumed					(4)
Fair Value Adjustment | Retail Branch | Core Deposits
Business Acquisition [Line Items]
Core deposit intangible					$ 66