CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income		$ 73,344	$ 54,452	$ 138,213	$ 215,204
Less: Net (loss) income attributable to noncontrolling interest		(38)	46	287	49
Net income attributable to WSFS		73,382	54,406	137,926	215,155
Net change in unrealized (losses) gains on investment securities available-for-sale
Net unrealized losses arising during the period, net of tax benefit of $63,954, $8,094, $178,061 and $22,457, respectively		(202,520)	(25,639)	(563,860)	(71,124)
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $—, $1, $— and $80, respectively		0	(2)	0	(252)
Net change in unrealized gains (losses) on investment securities available-for-sale		(202,520)	(25,641)	(563,860)	(71,376)
Net change in securities held-to-maturity
Net change in unrealized loss on available-for-sale securities reclassified to held-to-maturity, net of tax benefit of $36,520, $9 , $36,529 and $23, respectively	[1]	5,966	(29)	(113,858)	(73)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized loss, prior service cost and transition obligation, net of tax benefit of $10, 7, $27 and 20, respectively		(31)	(23)	(86)	(63)
Net change in cash flow hedge
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $13, $36, $38 and $106, respectively		(41)	(113)	(120)	(336)
Net change in equity method investments
Net change in other comprehensive income of equity method investments, net of tax expense of $8, $26, $67 and $112, respectively		25	82	213	355
Net current-period other comprehensive (loss) income		(196,601)	(25,724)	(677,711)	(71,493)
Total comprehensive (loss) income		$ (123,219)	$ 28,682	$ (539,785)	$ 143,662

[1] Includes $119.8 million, net of tax benefit, of unrealized losses on transferred investment securities with a book value of $1.1 billion from available-for-sale to held-to-maturity for the nine months ended September 30, 2022.