CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Beneficial	Impact of ASC 326 Adoption	As reported under ASC 326	Common Stock	Common Stock As reported under ASC 326	Capital in Excess of Par Value	Capital in Excess of Par Value As reported under ASC 326	Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income As reported under ASC 326	Retained Earnings	Retained Earnings Impact of ASC 326 Adoption	Retained Earnings As reported under ASC 326	Treasury Stock	Treasury Stock As reported under ASC 326	Total Stockholders' Equity of WSFS	Total Stockholders' Equity of WSFS Impact of ASC 326 Adoption	Total Stockholders' Equity of WSFS As reported under ASC 326	Non-controlling Interest	Non-controlling Interest As reported under ASC 326
Beginning Balance (in shares) at Dec. 31, 2018						56,926,978
Beginning Balance at Dec. 31, 2018		$ 820,920				$ 569		$ 349,810		$ (15,394)		$ 791,031			$ (305,096)		$ 820,920			$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		102,494										103,105					103,105			(611)
Other comprehensive income (loss)		47,613								47,613							47,613
Cash dividend		(16,208)										(16,208)					(16,208)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						484,843
Issuance of common stock including proceeds from exercise of common stock options		7,340				$ 6		7,334									7,340
Re-issuance of treasury stock in connection with the Beneficial merger and related items		950,044						687,897							262,071		949,968			76
Stock-based compensation expense		1,994						1,994									1,994
Repurchases of common shares	[1]	(57,740)													(57,740)		(57,740)
Ending Balance (in shares) at Sep. 30, 2019						57,411,821
Ending Balance at Sep. 30, 2019		$ 1,856,457				$ 575		1,047,035		32,219		877,928			(100,765)		1,856,992			(535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld for tax liabilities (in shares)			132,993
Repurchase of common stock (in shares)		1,230,640
Beginning Balance (in shares) at Jun. 30, 2019						57,239,683
Beginning Balance at Jun. 30, 2019		$ 1,836,388				$ 573		1,043,065		22,688		830,397			(60,112)		1,836,611			(223)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		53,595										53,882					53,882			(287)
Other comprehensive income (loss)		9,531								9,531							9,531
Cash dividend		(6,351)										(6,351)					(6,351)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						172,138
Issuance of common stock including proceeds from exercise of common stock options		3,213				$ 2		3,211									3,213
Beneficial merger and related items		(25)						0				0					0			(25)
Stock-based compensation expense		759						759									759
Repurchases of common shares	[2]	(40,653)													(40,653)		(40,653)
Ending Balance (in shares) at Sep. 30, 2019						57,411,821
Ending Balance at Sep. 30, 2019		$ 1,856,457				$ 575		1,047,035		32,219		877,928			(100,765)		1,856,992			(535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)		959,300
Beginning Balance (in shares) at Dec. 31, 2019						57,435,658	57,435,658
Beginning Balance at Dec. 31, 2019		$ 1,849,491		$ (30,368)	$ 1,819,123	$ 575	$ 575	1,049,064	$ 1,049,064	23,501	$ 23,501	917,377	$ (30,368)	$ 887,009	(140,211)	$ (140,211)	1,850,306	$ (30,368)	$ 1,819,938	(815)	$ (815)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		53,579										54,961					54,961			(1,382)
Other comprehensive income (loss)		43,094								43,094							43,094
Cash dividend		(18,319)										(18,319)					(18,319)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						110,906
Issuance of common stock including proceeds from exercise of common stock options		1,359				$ 1		1,358									1,359
Stock-based compensation expense		1,954						1,954									1,954
Repurchases of common shares	[3]	(39,488)						(749)							(38,739)		(39,488)
Ending Balance (in shares) at Sep. 30, 2020						57,546,564
Ending Balance at Sep. 30, 2020		$ 1,861,302				$ 576		1,051,627		66,595		923,651			$ (178,950)		1,863,499			(2,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld for tax liabilities (in shares)		24,884
Repurchase of common stock (in shares)															1,004,348
Beginning Balance (in shares) at Jun. 30, 2020						57,533,236
Beginning Balance at Jun. 30, 2020		$ 1,821,794				$ 576		1,050,678		72,780		878,585			$ (178,950)		1,823,669			(1,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		50,823										51,145					51,145			(322)
Other comprehensive income (loss)		(6,185)								(6,185)							(6,185)
Cash dividend		(6,079)										(6,079)					(6,079)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						13,328
Issuance of common stock including proceeds from exercise of common stock options		368				$ 0		368									368
Stock-based compensation expense		660						660									660
Repurchases of common shares	[4]	(79)						(79)									(79)
Ending Balance (in shares) at Sep. 30, 2020						57,546,564
Ending Balance at Sep. 30, 2020		$ 1,861,302				$ 576		$ 1,051,627		$ 66,595		$ 923,651			$ (178,950)		$ 1,863,499			$ (2,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld for tax liabilities (in shares)		2,353

[1] Repurchase of common stock includes 1,230,640 shares repurchased in connection with the Company's share repurchase program approved by the Board of Directors, and 132,993 shares repurchased to cover taxes due on the consideration transferred in the Beneficial acquisition related to the vesting of unrestricted Beneficial stock awards.

[2] Repurchase of common stock includes 959,300 shares repurchased in connection with the Company's share repurchase program approved by the Board of Directors.

[3] Repurchase of common stock includes 1,004,348 shares repurchased in connection with the Company's share repurchase program approved by the Board of Directors, and 24,884 shares withheld to cover tax liabilities

[4] Repurchase of common stock includes 2,353 shares withheld to cover tax liabilities.