SEGMENT INFORMATION - Net Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 837,258	$ 1,532,939
Goodwill	883,637	472,828	$ 472,828
Other segment assets	18,193,860	13,771,560
Total assets	19,914,755	15,777,327
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	317,022	1,039,046
Goodwill	753,586	452,629	$ 452,629
Other segment assets	17,824,946	13,481,370
Total assets	18,895,554	14,973,045
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	476,850	477,806
Goodwill	0	0
Other segment assets	10,429	6,785
Total assets	487,279	484,591
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	43,386	16,087
Goodwill	130,051	20,199
Other segment assets	358,485	283,405
Total assets	$ 531,922	$ 319,691