CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income		$ 74,263	$ 73,344	$ 205,520	$ 138,213
Less: Net income (loss) attributable to noncontrolling interest		97	(38)	272	287
Net income attributable to WSFS		74,166	73,382	205,248	137,926
Net change in unrealized losses on investment securities available-for-sale
Net unrealized losses arising during the period, net of tax benefit of $40,270, $63,954, $36,278, and $178,061, respectively		(127,523)	(202,520)	(114,880)	(563,860)
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 $(1,379), $(1,884), $(4,080), and $35,955, respectively(1)	[1]	4,366	5,966	12,924	(113,858)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized gain and prior service cost, net of tax expense of $16, $10, $44, and $27, respectively		(51)	(31)	(140)	(86)
Net change in cash flow hedge
Net unrealized loss arising during the period, net of tax benefit of $508, $—, $869, and $—, respectively		(1,608)	0	(2,752)	0
Amortization of unrealized gain on terminated cash flow hedges, net of tax expense of $9, $13, $34, and $38, respectively		(28)	(41)	(107)	(120)
Net change in cash flow hedge		(1,636)	(41)	(2,859)	(120)
Net change in equity method investments
Net change in other comprehensive income of equity method investments, net of tax expense of $61, $8, $28, and $67, respectively		192	25	88	213
Net current-period other comprehensive (loss) income		(124,652)	(196,601)	(104,867)	(677,711)
Total comprehensive (loss) income		$ (50,486)	$ (123,219)	$ 100,381	$ (539,785)

[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.