GOODWILL AND INTANGIBLE ASSETS - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 472,828
Goodwill from business combinations	414,337
Goodwill ending balance	887,165
WSFS Bank
Goodwill [Roll Forward]
Goodwill beginning balance	452,629
Goodwill from business combinations	297,646
Goodwill ending balance	750,275
Cash Connect
Goodwill [Roll Forward]
Goodwill beginning balance	0
Goodwill from business combinations	0
Goodwill ending balance	0
Wealth Management
Goodwill [Roll Forward]
Goodwill beginning balance	20,199
Goodwill from business combinations	116,691
Goodwill ending balance	$ 136,890