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, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 883,637	$ 472,828
Goodwill from business combinations	2,261	414,337
Goodwill adjustments		(3,528)
Goodwill, ending balance	885,898	883,637
WSFS Bank
Goodwill [Roll Forward]
Goodwill, beginning balance	753,586	452,629
Goodwill from business combinations	0	297,646
Goodwill adjustments		3,311
Goodwill, ending balance	753,586	753,586
Wealth Management
Goodwill [Roll Forward]
Goodwill, beginning balance	130,051	20,199
Goodwill from business combinations	2,261	116,691
Goodwill adjustments		(6,839)
Goodwill, ending balance	$ 132,312	$ 130,051