SEGMENT INFORMATION - Schedule of Segment Information and Statement of Financial Condition (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 977,071	$ 1,092,900	$ 1,103,040	$ 837,258
Goodwill and intangible assets	885,898	885,898
Other segment assets	18,716,279	18,615,874
Total assets	20,579,248	20,594,672
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	750,657	600,483
Goodwill and intangible assets	753,586	753,586
Other segment assets	18,278,973	18,191,585
Total assets	19,783,216	19,545,654
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	173,291	443,431
Goodwill and intangible assets	0	0
Other segment assets	15,798	15,654
Total assets	189,089	459,085
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	53,123	48,986
Goodwill and intangible assets	132,312	132,312
Other segment assets	421,508	408,635
Total assets	$ 606,943	$ 589,933