SEGMENT INFORMATION - Net Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 1,154,818	$ 1,092,900
Goodwill	885,898	885,898	$ 883,637
Other segment assets	18,773,587	18,615,874
Total assets	20,814,303	20,594,672
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	686,735	600,483
Goodwill	753,586	753,586	$ 753,586
Other segment assets	18,292,205	18,191,585
Total assets	19,732,526	19,545,654
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	424,907	443,431
Goodwill	0	0
Other segment assets	12,536	15,654
Total assets	437,443	459,085
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	43,176	48,986
Goodwill	132,312	132,312
Other segment assets	468,846	408,635
Total assets	$ 644,334	$ 589,933