Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 271,605	$ 113,320	$ 147,918
Less: Net income (loss) attributable to noncontrolling interest	163	(1,454)	(891)
Net income attributable to WSFS	271,442	114,774	148,809
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 $(29,523), $12,585, and $13,179, respectively	(93,503)	39,853	41,733
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $80, $2,178, and $80, respectively	(252)	(6,898)	(253)
Net change in unrealized gains (losses) on investment securities available-for-sale	(93,755)	32,955	41,480
Net change in securities held-to-maturity
Amortization of unrealized gain on securities reclassified to held-to-maturity, net of tax expense of $32, $60, and $98, respectively	(101)	(192)	(311)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized gain (loss), prior service cost and transition obligation, net of tax expense (benefit) of $50, $(585), and $(1,439), respectively	97	(1,683)	(4,151)
Pension settlement, net of tax expense of $—, $67 and $—, respectively	0	212	0
Net change in unfunded pension liability	97	(1,471)	(4,151)
Net change in cash flow hedge
Net unrealized gain arising during the period, net of tax expense of $—, $493, and $593, respectively	0	1,560	1,877
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $119, $106 and $—, respectively	(378)	(337)	0
Net change in cash flow hedge	(378)	1,223	1,877
Net change in equity method investments
Net change in other comprehensive loss of equity method investments, net of tax expense (benefit) of $114, $(3), and $—, respectively	362	(9)	0
Total other comprehensive (loss) income	(93,775)	32,506	38,895
Total comprehensive income	$ 177,667	$ 147,280	$ 187,704