GOODWILL AND INTANGIBLE ASSETS - Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 885,898	$ 883,637
Goodwill from business combinations		2,261
Goodwill adjustments	0
Goodwill, ending balance	885,898	885,898
WSFS Bank
Goodwill [Roll Forward]
Goodwill, beginning balance	753,586	753,586
Goodwill from business combinations		0
Goodwill adjustments	0
Goodwill, ending balance	753,586	753,586
Wealth Management
Goodwill [Roll Forward]
Goodwill, beginning balance	132,312	130,051
Goodwill from business combinations		2,261
Goodwill adjustments	0
Goodwill, ending balance	$ 132,312	$ 132,312