Segment Information - Net Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 1,532,939	$ 1,654,735
Goodwill	472,828	472,828	$ 472,828
Other segment assets	13,771,560	12,206,351
Total assets	15,777,327	14,333,914
WSFS Bank
Segment Reporting Information [Line Items]
Cash and cash equivalents	1,039,046	1,246,394
Goodwill	452,629	452,629	$ 452,629
Other segment assets	13,481,370	11,963,345
Total assets	14,973,045	13,662,368
Cash Connect
Segment Reporting Information [Line Items]
Cash and cash equivalents	477,806	397,878
Goodwill	0	0
Other segment assets	6,785	6,997
Total assets	484,591	404,875
Wealth Management
Segment Reporting Information [Line Items]
Cash and cash equivalents	16,087	10,463
Goodwill	20,199	20,199
Other segment assets	283,405	236,009
Total assets	$ 319,691	$ 266,671