Goodwill and Intangibles - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Goodwill [Line Items]
Goodwill, Beginning balance	$ 85,212
Changes in goodwill	(360)	$ 336
Goodwill, Ending balance	84,852
WSFS Bank [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	80,078
Changes in goodwill	(360)
Goodwill, Ending balance	79,718
Trust & Wealth Management [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	5,134
Goodwill, Ending balance	$ 5,134