CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income		$ 269,025	$ 222,648	$ 271,605
Less: Net (loss) gain attributable to noncontrolling interest		(131)	273	163
Net income attributable to WSFS		269,156	222,375	271,442
Net change in unrealized gains (losses) on investment securities available-for-sale
Net unrealized gains (losses) arising during the period, net of tax expense (benefit) of $20,085, $(167,261), and $(29,523), respectively		63,601	(529,660)	(93,503)
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $—, $—, and $80, respectively		0	0	(252)
Net change in unrealized gains (losses) on investment securities available-for-sale		63,601	(529,660)	(93,755)
Net change in securities held-to-maturity
Net change in unrealized gains (losses) on securities reclassified to held-to-maturity, net of tax (benefit) expense of $(5,361), $34,319, and $32, respectively(1)(2)	[1],[2]	16,980	(108,678)	(101)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized (loss) gain and prior service cost, net of tax expense (benefit) of $1, $(5), and $50, respectively		(132)	209	97
Net change in cash flow hedge
Net unrealized gain arising during the period, net of tax expense of $504, $—, and $—, respectively		1,596	0	0
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $34, $51 and $119, respectively		(107)	(160)	(378)
Net change in cash flow hedge		1,489	(160)	(378)
Net change in equity method investments
Net change in other comprehensive (loss) income of equity method investments, net of tax (benefit) expense of $(27), $67, and $114, respectively		(85)	213	362
Total other comprehensive income (loss)		81,853	(638,076)	(93,775)
Total comprehensive income (loss)		$ 351,009	$ (415,701)	$ 177,667

[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.

[2] Includes amortization of unrealized gains and losses on securities reclassified to held-to-maturity.