SEGMENT INFORMATION - Details of Segment Information - Statement of Financial Condition (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 1,072,920	$ 571,752
Goodwill	472,828	472,828
Other segment assets	12,284,360	11,211,722
Total assets	13,830,108	12,256,302
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	720,456	202,792
Goodwill	452,629	452,629
Other segment assets	12,045,866	10,982,681
Total assets	13,218,951	11,638,102
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	342,951	357,494
Goodwill	0	0
Other segment assets	6,757	6,555
Total assets	349,708	364,049
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	9,513	11,466
Goodwill	20,199	20,199
Other segment assets	231,737	222,486
Total assets	$ 261,449	$ 254,151