Parent Company Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income attributable to WSFS	$ 271,442	$ 114,774	$ 148,809
Adjustments to reconcile net income to net cash provided by operating activities:
Realized loss on sale of equity investments		(22,800)	(26,200)
Unrealized (gains) losses on equity investments	(5,141)	(761)	(26,175)
Decrease (increase) in other assets	(46,378)	(18,339)	(4,676)
(Decrease) increase in other liabilities	(4,807)	24,675	30,922
Net cash provided by operating activities	125,648	15,142	89,866
Investing activities:
Net cash (used in) provided by investing activities	(1,492,368)	(874,944)	293,823
Financing activities:
Issuance of common stock and exercise of common stock options	1,522	2,032	7,755
Issuance of senior debt	0	147,780	0
Redemption of senior debt	(100,000)	0	0
Purchase of treasury stock	(13,268)	(155,832)	(97,186)
Dividends paid	(24,242)	(24,369)	(22,463)
Net cash provided by (used in) financing activities	1,244,924	1,942,785	(432,694)
(Decrease) increase in cash, cash equivalents, and restricted cash	(121,796)	1,082,983	(49,005)
Cash, cash equivalents, and restricted cash at beginning of period	1,654,735	571,752	620,757
Cash, cash equivalents, and restricted cash at end of period	1,532,939	1,654,735	571,752
WSFS Financial Corporation
Operating activities:
Net income attributable to WSFS	271,442	114,774	148,809
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed (income) loss of subsidiaries	(276,208)	84,346	92,020
Realized loss on sale of equity investments	706	0	0
Unrealized (gains) losses on equity investments	(5,389)	1,617	(3,646)
Decrease (increase) in other assets	10,910	(4,537)	3,538
(Decrease) increase in other liabilities	(6,690)	7,684	6,012
Net cash provided by operating activities	(5,229)	203,884	246,733
Investing activities:
Net cash for business combinations	0	0	(93,990)
Net cash (used in) provided by investing activities	0	0	(93,990)
Financing activities:
Issuance of common stock and exercise of common stock options	1,522	2,032	7,755
Issuance of senior debt	0	147,780	0
Redemption of senior debt	(100,000)	0	0
Purchase of treasury stock	(13,268)	(155,832)	(97,186)
Dividends paid	(24,242)	(24,369)	(22,463)
Net cash provided by (used in) financing activities	(135,988)	(30,389)	(111,894)
(Decrease) increase in cash, cash equivalents, and restricted cash	(141,217)	173,495	40,849
Cash, cash equivalents, and restricted cash at beginning of period	244,925	71,430	30,581
Cash, cash equivalents, and restricted cash at end of period	$ 103,708	$ 244,925	$ 71,430