SEGMENT INFORMATION - Details of Segment Information - Statement of Financial Condition (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 955,767	$ 571,752
Goodwill	472,828	472,828
Other segment assets	12,144,762	11,211,722
Total assets	13,573,357	12,256,302
Capital expenditures for the period ended	2,830	14,198
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	591,518	202,792
Goodwill	452,629	452,629
Other segment assets	11,914,250	10,982,681
Total assets	12,958,397	11,638,102
Capital expenditures for the period ended	2,437	11,806
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	356,785	357,494
Goodwill	0	0
Other segment assets	5,171	6,555
Total assets	361,956	364,049
Capital expenditures for the period ended	256	2,120
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	7,464	11,466
Goodwill	20,199	20,199
Other segment assets	225,341	222,486
Total assets	253,004	254,151
Capital expenditures for the period ended	$ 137	$ 272