GOODWILL AND INTANGIBLE ASSETS - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 472,828	$ 472,828
Goodwill from business combinations	414,337
Goodwill adjustments	(3,528)	0
Goodwill, ending balance	883,637	472,828
WSFS Bank
Goodwill [Roll Forward]
Goodwill, beginning balance	452,629	452,629
Goodwill from business combinations	297,646
Goodwill adjustments	3,311	0
Goodwill, ending balance	753,586	452,629
Wealth Management
Goodwill [Roll Forward]
Goodwill, beginning balance	20,199	20,199
Goodwill from business combinations	116,691
Goodwill adjustments	(6,839)	0
Goodwill, ending balance	$ 130,051	$ 20,199