Goodwill and Intangibles - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning balance	$ 48,651
Changes in goodwill	173	135
Goodwill, Ending balance	48,824
WSFS Bank [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	43,517
Changes in goodwill	173
Goodwill, Ending balance	43,690
Trust & Wealth Management [Member]
Goodwill [Line Items]
Goodwill, Beginning balance			5,134
Goodwill, Ending balance	$ 5,134		$ 5,134