Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Accumulated other comprehensive income, deferred tax (benefit) expense	$ (2,545)	$ 7,075	$ (13,824)
Accumulated other comprehensive income, a deferred tax expense (benefit)	866	(3,800)	$ 4,968
Retained earnings amount for which no provision for income tax has been made	51,800
Unrecognized tax liability	20,803
Valuation reserve	0	242
Valuation allowance associated with net operating losses		648
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, limitations on use	900
State [Member] | New Jersey [Member]
Operating Loss Carryforwards [Line Items]
Unused capital loss carryforwards	1,000
State [Member] | Pennsylvania [Member]
Operating Loss Carryforwards [Line Items]
Unused capital loss carryforwards	1,000
Team Capital [Member]
Operating Loss Carryforwards [Line Items]
Acquired gross tax asset		$ 486
Beacon Trust [Member]
Operating Loss Carryforwards [Line Items]
Unused capital loss carryforwards	$ 3,000