Goodwill and Intangibles - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	$ 167,539
Remeasurement adjustments	(1,579)	$ (358)
Goodwill from business combinations	0
Goodwill resulting from the acquisition ending balance	165,960
WSFS Bank
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	147,396
Remeasurement adjustments	(1,635)
Goodwill from business combinations	0
Goodwill resulting from the acquisition ending balance	145,761
Cash Connect
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	0
Remeasurement adjustments	0
Goodwill from business combinations	0
Goodwill resulting from the acquisition ending balance	0
Wealth Management
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	20,143
Remeasurement adjustments	56
Goodwill from business combinations	0
Goodwill resulting from the acquisition ending balance	$ 20,199