CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (7,811)	$ 35,969	$ 2,756	$ 48,899
Less: Net loss attributable to noncontrolling interest	(700)	(231)	(1,060)	(324)
Net (loss) income attributable to WSFS	(7,111)	36,200	3,816	49,223
Net change in unrealized gains on investment securities available-for-sale
Net unrealized gains arising during the period, net of tax expense of $1,169, $6,289, $15,707 and $11,831, respectively	3,703	19,591	49,739	36,856
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $458, $15, $624, and $19, respectively	(1,450)	(48)	(1,977)	(59)
Net change in unrealized gains (losses) on investment securities available-for-sale	2,253	19,543	47,762	36,797
Net change in securities held-to-maturity
Amortization of unrealized gain on securities reclassified to held-to-maturity, net of tax expense of $18, $27, $38, and $56, respectively	(57)	(84)	(122)	(177)
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 of $8, $8, $7, and $17, respectively	(26)	(34)	(22)	(175)
Pension settlement, net of tax expense of $67, $0, $67, and $0, respectively	212	0	212	0
Net change in unfunded pension liability	186	(34)	190	(175)
Net change in cash flow hedge
Net unrealized (loss) gain arising during the period, net of tax (benefit) expense of $(8), $323, $493, and $525, respectively	(25)	1,007	1,560	1,637
Amortization of unrealized gain on terminated cash flow hedges, net of tax benefit of $35, $0, $35, and $0, respectively	(111)	0	(111)	0
Net change in cash flow hedge	(136)	1,007	1,449	1,637
Total other comprehensive income	2,246	20,432	49,279	38,082
Total comprehensive (loss) income	(4,865)	56,632	53,095	87,305
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax	$ 67	$ 0	$ 67	$ 0