SEGMENT INFORMATION - Schedule of Segment Information and Statement of Financial Condition (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 990,918	$ 1,092,900	$ 611,480	$ 837,258
Goodwill	885,898	885,898
Other segment assets	19,028,393	18,615,874
Total assets	20,905,209	20,594,672
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	585,912	600,483
Goodwill	753,586	753,586
Other segment assets	18,574,502	18,191,585
Total assets	19,914,000	19,545,654
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	366,675	443,431
Goodwill	0	0
Other segment assets	17,097	15,654
Total assets	383,772	459,085
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	38,331	48,986
Goodwill	132,312	132,312
Other segment assets	436,794	408,635
Total assets	$ 607,437	$ 589,933