CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 53,595	$ 38,935	$ 102,494	$ 105,025
Less: Net loss attributable to noncontrolling interest	(287)	0	(611)	0
Net income attributable to WSFS	53,882	38,935	103,105	105,025
Net change in unrealized gains (loss) on investment securities available for sale
Net unrealized gains (loss) arising during the period, net of tax expense (benefit) of $2,911 and $(1,846), $14,565, and $(6,958), respectively	9,268	(6,042)	46,124	(22,370)
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $0, $0, $19 and $5, respectively	0	0	(59)	(16)
Net change in unrealized gains (losses) on investment securities available-for-sale	9,268	(6,042)	46,065	(22,386)
Net change in securities held to maturity
Amortization of unrealized gain on securities reclassified to held-to-maturity, net of tax expense of $22, $36, $78, and $109, respectively	(70)	(107)	(247)	(343)
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 $(11), $(9), $(66) and $1, respectively	(35)	(30)	(210)	(1)
Net change in cash flow hedge
Net unrealized gain (loss) arising during the period, net of tax expense (benefit) of $116, $(75), $633 and $(391) respectively		(109)		(1,119)
Net unrealized gain (loss) arising during the period, net of tax expense (benefit) of $118, $(75), $1 and $(391) respectively	368		2,005
Total other comprehensive income (loss)	9,531	(6,288)	47,613	(23,849)
Total comprehensive income	$ 63,413	$ 32,647	$ 150,718	$ 81,176