Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) - USD ($) $ in Thousands	May 02, 2016	Sep. 30, 2016	Dec. 31, 2015
Liabilities assumed:
Goodwill recorded in the merger		$ 66,537	$ 1,822
Cape Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Total Purchase Price:	$ 196,403
Assets acquired:
Cash and cash equivalents	30,025
Securities and Federal Home Loan Bank Stock	218,938
Loans	1,157,753
Premises and equipment	21,723
Other real estate owned	1,996
Deferred tax asset	21,664
Other assets	61,793
Core deposit intangible	3,718
Total assets acquired	1,517,610
Liabilities assumed:
Deposits	(1,248,367)
Borrowings	(124,466)
Other liabilities	(12,835)
Total liabilities assumed	(1,385,668)
Net assets acquired	131,942
Goodwill recorded in the merger	64,461
Cape Bancorp, Inc. [Member] | Book Value [Member]
Assets acquired:
Cash and cash equivalents	30,025
Securities and Federal Home Loan Bank Stock	218,577
Loans	1,169,568
Premises and equipment	27,972
Other real estate owned	2,343
Deferred tax asset	9,407
Other assets	61,793
Core deposit intangible	831
Total assets acquired	1,520,516
Liabilities assumed:
Deposits	(1,247,688)
Borrowings	(123,587)
Other liabilities	(7,611)
Total liabilities assumed	(1,378,886)
Net assets acquired	141,630
Cape Bancorp, Inc. [Member] | Purchase Accounting Adjustments [Member]
Assets acquired:
Securities and Federal Home Loan Bank Stock	361
Specific credit fair value on credit impaired loans	(4,925)
General credit fair value	(20,533)
Interest rate fair value	1,888
Reverse allowance for loan losses	9,931
Reverse net deferred fees, premiums and discounts	1,824
Premises and equipment	(6,249)
Other real estate owned	(347)
Deferred tax asset	12,257
Core deposit intangible	2,887
Total assets acquired	(2,906)
Liabilities assumed:
Deposits	(679)
Borrowings	(879)
Other liabilities	(5,224)
Total liabilities assumed	(6,782)
Net assets acquired	$ (9,688)