SEGMENT INFORMATION - Net Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 1,092,900	$ 837,258
Goodwill	885,898	883,637	$ 472,828
Other segment assets	18,615,874	18,193,860
Total assets	20,594,672	19,914,755
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	600,483	317,022
Goodwill	753,586	753,586	$ 452,629
Other segment assets	18,191,585	17,824,946
Total assets	19,545,654	18,895,554
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	443,431	476,850
Goodwill	0	0
Other segment assets	15,654	10,429
Total assets	459,085	487,279
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	48,986	43,386
Goodwill	132,312	130,051
Other segment assets	408,635	358,485
Total assets	$ 589,933	$ 531,922