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, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 883,637
Goodwill adjustments	0
Goodwill ending balance	883,637
WSFS Bank
Goodwill [Roll Forward]
Goodwill beginning balance	753,586
Goodwill adjustments	0
Goodwill ending balance	753,586
Cash Connect
Goodwill [Roll Forward]
Goodwill beginning balance	0
Goodwill adjustments	0
Goodwill ending balance	0
Wealth Management
Goodwill [Roll Forward]
Goodwill beginning balance	130,051
Goodwill adjustments	0
Goodwill ending balance	$ 130,051