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, 2017	Jun. 30, 2016
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	$ 167,539
Remeasurement adjustments	(1,532)	$ (360)
Goodwill resulting from the acquisition ending balance	166,007	84,852
WSFS Bank
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	147,396
Remeasurement adjustments	(1,588)
Goodwill resulting from the acquisition ending balance	145,808	79,718
Cash Connect
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	0
Remeasurement adjustments	0
Goodwill resulting from the acquisition ending balance	0	$ 0
Wealth Management
Goodwill [Roll Forward]
Goodwill resulting from the acquisition beginning balance	20,143
Remeasurement adjustments	56
Goodwill resulting from the acquisition ending balance	$ 20,199