Business Combinations - Schedule of Supplemental Pro Forma Financial Information (Detail) - Cape Bancorp, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Net interest income, Actual	$ 22,715
Provision for loan losses, Actual	250
Non-interest income, Actual	2,242
Non-interest expense, Actual	12,316
Net income, Actual	$ 8,310
Earnings per share, Actual:
Fully diluted, Actual	$ 0
Net interest income, Pro forma		$ 101,107	$ 93,467
Provision for loan losses, Pro forma		3,329	3,650
Non-interest income, Pro forma		16,386	23,546
Non-interest expense, Pro forma		88,376	73,565
Net income, Pro forma		$ 15,067	$ 28,070
Earnings per share, Pro forma:
Fully diluted, Pro forma		$ 0.59	$ 1.12