CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income		$ 222,648	$ 271,605	$ 113,320
Less: Net income (loss) attributable to noncontrolling interest		273	163	(1,454)
Net income attributable to WSFS		222,375	271,442	114,774
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 $(167,261), $(29,523), and $12,585, respectively		(529,660)	(93,503)	39,853
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $—, $80, and $2,178, respectively		0	(252)	(6,898)
Net change in unrealized gains (losses) on investment securities available-for-sale		(529,660)	(93,755)	32,955
Net change in securities held-to-maturity
Amortization of unrealized losses on securities reclassified to held-to-maturity, net of tax expense of $34,319, $32, and $60, respectively	[1],[2]	(108,678)	(101)	(192)
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 (benefit) expense of $(5), $50, and $(585), respectively		209	97	(1,683)
Pension settlement, net of tax expense of $—, $— and $67, respectively		0	0	212
Net change in unfunded pension liability		209	97	(1,471)
Net change in cash flow hedge
Net unrealized gain arising during the period, net of tax expense of $—, $—, and $493, respectively		0	0	1,560
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $51, $119 and $106, respectively		(160)	(378)	(337)
Net change in cash flow hedge		(160)	(378)	1,223
Net change in equity method investments
Net change in other comprehensive income (loss) of equity method investments, net of tax expense (benefit) of $67, $114, and $(3), respectively		213	362	(9)
Total other comprehensive (loss) income		(638,076)	(93,775)	32,506
Total comprehensive (loss) income		$ (415,701)	$ 177,667	$ 147,280

[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 for the year ended December 31, 2022.

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