CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income		$ 68,595	$ 60,902	$ 131,257	$ 64,869
Less: Net (loss) income attributable to noncontrolling interest		(83)	162	175	325
Net income attributable to WSFS		68,678	60,740	131,082	64,544
Net change in unrealized (losses) gains on investment securities available-for-sale
Net unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(12,747), $(26,975), $3,993, and $(114,107), respectively		(40,367)	(85,422)	12,643	(361,340)
Net change in securities held-to-maturity
Net change unrealized gains (losses) on available-for-sale securities reclassified to held-to-maturity, net of tax (benefit) expense of $(1,386), $37,830, $(2,702), and $37,839, respectively(1)	[1]	4,393	(119,796)	8,558	(119,824)
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 $17, 9, $28, and $17, respectively		(54)	(28)	(89)	(55)
Net change in cash flow hedge
Net unrealized (gain) loss arising during the period, net of tax expense of $(466), $—, $(361), and $—, respectively		(1,475)	0	(1,143)	1
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $13, $13, $25, and $25, respectively		(40)	(40)	(80)	(80)
Net change in cash flow hedge		(1,515)	(40)	(1,223)	(79)
Net change in equity method investments
Net change in other comprehensive income of equity method investments, net of tax (benefit) expense of $(32), $59, $(33), and $59, respectively		(101)	188	(104)	188
Net current-period other comprehensive (loss) income		(37,644)	(205,098)	19,785	(481,110)
Total comprehensive income (loss)		$ 31,034	$ (144,358)	$ 150,867	$ (416,566)

[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 that were transferred in June 2022.