SEGMENT INFORMATION - Schedule of Segment Information and Statement of Financial Condition (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 1,021,716	$ 1,092,900	$ 1,115,560	$ 837,258
Goodwill	885,898	885,898
Other segment assets	18,836,916	18,615,874
Total assets	20,744,530	20,594,672
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	609,850	600,483
Goodwill	753,586	753,586
Other segment assets	18,393,939	18,191,585
Total assets	19,757,375	19,545,654
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	371,122	443,431
Goodwill	0	0
Other segment assets	20,302	15,654
Total assets	391,424	459,085
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	40,744	48,986
Goodwill	132,312	132,312
Other segment assets	422,675	408,635
Total assets	$ 595,731	$ 589,933