Business Combinations - Summary of Assets Acquired and Liabilities Assumed and Their Initial Fair Value Estimates (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Nov. 30, 2016	May 02, 2016	Mar. 11, 2016
Liabilities Assumed
Goodwill	$ 148,433	$ 145,064
Retail Branch
Assets acquired:
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
Assets acquired:
Core deposit intangible					66
Cape Bancorp, Inc.
Assets acquired:
Cash and cash equivalents				$ 30,025
Loans				1,156,719
Other assets				61,793
Total assets acquired				1,516,701
Liabilities Assumed
Deposits				(1,248,367)
Other liabilities				(12,767)
Total liabilities assumed				(1,385,600)
Goodwill				$ 65,302
Cape Bancorp, Inc. | Core Deposits
Assets acquired:
Core deposit intangible					3,700
Ocean Shore Holdings Co.
Assets acquired:
Cash and cash equivalents			$ 60,871
Loans			773,900
Other assets			35,364
Total assets acquired			994,610
Liabilities Assumed
Deposits			(875,073)
Other liabilities			(16,166)
Total liabilities assumed			(894,933)
Goodwill			$ 81,055
Ocean Shore Holdings Co. | Core Deposits
Assets acquired:
Core deposit intangible					$ 7,500