CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 64,409	$ 74,263	$ 199,340	$ 205,520
Less: Net (loss) income attributable to noncontrolling interest	(26)	97	(129)	272
Net income attributable to WSFS	64,435	74,166	199,469	205,248
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 $40,491, $(40,270), $24,984, and $(36,278), respectively	128,223	(127,523)	79,116	(114,880)
Net change in securities held-to-maturity
Amortization of net unrealized losses on available-for-sale securities reclassified to held-to-maturity, net of tax benefit of $1,252, $1,379, $3,613, and $4,080, respectively	(3,965)	(4,366)	(11,442)	(12,924)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized gain and prior service cost, net of tax expense of $17, $16, $72, and $44, respectively	(53)	(51)	(229)	(140)
Net change in cash flow hedge
Amount of Loss Recognized in OCI on Derivative (Effective Portion)	(10,722)	1,608	(3,702)	2,752
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $—, $9, $—, and $34, respectively	0	(28)	0	(107)
Net change in cash flow hedge	10,722	(1,636)	3,702	(2,859)
Net change in equity method investments
Net change in other comprehensive income of equity method investments, net of tax expense (benefit) of $1, $61, $(18), and $28, respectively	4	192	(57)	88
Net current-period other comprehensive (loss) income	142,861	(124,652)	93,974	(104,867)
Total comprehensive income (loss)	$ 207,296	$ (50,486)	$ 293,443	$ 100,381