GOODWILL AND INTANGIBLE ASSETS - Schedule of Allocation of Goodwill to our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2026	Jun. 30, 2026
Goodwill [Roll Forward]
Goodwill beginning balance	$ 885,224	$ 885,224
Goodwill adjustments	(674)	0
Goodwill ending balance		885,224
WSFS Bank
Goodwill [Roll Forward]
Goodwill beginning balance	753,586	753,586
Goodwill adjustments	0	0
Goodwill ending balance		753,586
Wealth and Trust
Goodwill [Roll Forward]
Goodwill beginning balance	131,638	131,638
Goodwill adjustments	$ (674)	0
Goodwill ending balance		$ 131,638

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details