Subsequent Event - Additional Information (Detail) $ / shares in Units, $ in Millions		3 Months Ended
	Jan. 05, 2016 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) Banking_Office Loan_Office shares	Dec. 31, 2015 shares
Subsequent Event [Line Items]
Common stock exchanged for each share of Cape common stock	0.6375
Common stock, shares issued | shares		33,566,772	33,566,772
Cape Bancorp [Member]
Subsequent Event [Line Items]
Cost of acquisition	$ 195
Cash to be received for each share of Cape common stock | $ / shares	$ 2.25
Common stock, shares issued | shares	8,283,000
Number of full-service banking offices | Banking_Office		22
Number of loan offices | Loan_Office		5
Total assets		$ 1,600
Total loans		1,200
Total deposits		$ 1,100