SEGMENT INFORMATION - Schedule of Segment Information and Statement of Financial Condition (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 611,480	$ 837,258	$ 1,031,391	$ 1,532,939
Goodwill	885,898	883,637
Other segment assets	18,543,614	18,193,860
Total assets	20,040,992	19,914,755
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	241,531	317,022
Goodwill	753,586	753,586
Other segment assets	18,132,659	17,824,946
Total assets	19,127,776	18,895,554
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	327,417	476,850
Goodwill	0	0
Other segment assets	11,662	10,429
Total assets	339,079	487,279
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	42,532	43,386
Goodwill	132,312	130,051
Other segment assets	399,293	358,485
Total assets	$ 574,137	$ 531,922