CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 65,141	$ 10,567
Less: Net income (loss) attributable to noncontrolling interest	59	(360)
Net income attributable to WSFS	65,082	10,927
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 $(21,972) and $14,538, respectively	(69,589)	46,036
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $79 and $166, respectively	(250)	(527)
Net change in unrealized gains (losses) on investment securities available-for-sale	(69,839)	45,509
Net change in securities held-to-maturity
Amortization of unrealized gain on securities reclassified to held-to-maturity, net of tax expense of $5 and $21, respectively	(16)	(65)
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized (loss) gain, prior service cost and transition obligation, net of tax (benefit) expense of $(5) and $1, respectively	(16)	4
Net change in cash flow hedge
Net unrealized gain arising during the period, net of tax expense of $— and $501, respectively	0	1,585
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $35 and $—, respectively	(111)	0
Net change in cash flow hedge	(111)	1,585
Net change in other comprehensive income of equity method investments, net of tax expense of $86, and $—, respectively	273	0
Total other comprehensive (loss) income	(69,709)	47,033
Total comprehensive (loss) income	$ (4,627)	$ 57,960