SEGMENT INFORMATION - Details of Segment Information - Statement of Financial Condition (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 1,103,040	$ 837,258	$ 2,283,769	$ 1,532,939
Goodwill	883,637	883,637
Other segment assets	18,332,613	18,193,860
Total assets	20,319,290	19,914,755
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	659,901	317,022
Goodwill	753,586	753,586
Other segment assets	17,933,900	17,824,946
Total assets	19,347,387	18,895,554
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	394,931	476,850
Goodwill	0	0
Other segment assets	3,137	10,429
Total assets	398,068	487,279
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	48,208	43,386
Goodwill	130,051	130,051
Other segment assets	395,576	358,485
Total assets	$ 573,835	$ 531,922