CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Common Stock	Capital in Excess of Par Value	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock	Treasury Stock Beneficial	Total Stockholders' Equity of WSFS	Non-controlling Interest
Beginning Balance at Dec. 31, 2017		$ 724,345	$ 563	$ 336,271	$ (8,152)	$ 669,557	$ (273,894)		$ 724,345	$ 0
Beginning Balance (in shares) at Dec. 31, 2017			56,279,527
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		105,025				105,025			105,025	0
Other comprehensive income (loss)		(23,849)			(23,869)				(23,869)
Cash dividend		(9,797)				(9,797)			(9,797)
Issuance of common stock including proceeds from exercise of common stock options		9,776	$ 4	9,772					9,776
Issuance of common stock including proceeds from exercise of common stock options (in shares)			600,808
Stock-based compensation expense		1,857		1,857					1,857
Repurchase of common stock		(8,515)					(8,515)		(8,515)
Ending Balance at Sep. 30, 2018		798,822	$ 567	347,900	(32,001)	764,765	(282,409)		798,822	0
Ending Balance (in shares) at Sep. 30, 2018			56,880,335
Beginning Balance at Jun. 30, 2018		768,977	$ 566	344,750	(25,713)	729,329	(279,955)		768,977	0
Beginning Balance (in shares) at Jun. 30, 2018			56,685,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		38,935				38,935			38,935	0
Other comprehensive income (loss)		(6,288)			(6,288)				(6,288)
Cash dividend		(3,499)				(3,499)			(3,499)
Issuance of common stock including proceeds from exercise of common stock options		2,714	$ 1	2,713					2,714
Issuance of common stock including proceeds from exercise of common stock options (in shares)			194,951
Stock-based compensation expense		437		437					437
Repurchase of common stock		(2,454)					(2,454)		(2,454)
Ending Balance at Sep. 30, 2018		798,822	$ 567	347,900	(32,001)	764,765	(282,409)		798,822	0
Ending Balance (in shares) at Sep. 30, 2018			56,880,335
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification due to the adoption of ASU No. 2016-01 | Accounting Standards Update 2016-01					20	(20)
Beginning Balance at Dec. 31, 2018		820,920	$ 569	349,810	(15,394)	791,031	(305,096)		820,920	0
Beginning Balance (in shares) at Dec. 31, 2018			56,926,978
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		7,340	$ 6	7,334					7,340
Issuance of common stock including proceeds from exercise of common stock options (in shares)			484,843
Re-issuance of treasury stock in connection with BNCL merger and related items		950,044		687,897			262,071		949,968	76
Stock-based compensation expense		1,994		1,994					1,994
Repurchase of common stock	[1]	(57,740)					(57,740)		(57,740)
Ending Balance at Sep. 30, 2019		1,856,457	$ 575	1,047,035	32,219	877,928	$ (100,765)		1,856,992	(535)
Ending Balance (in shares) at Sep. 30, 2019			57,411,821
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchased (in shares)							1,230,640	132,993
Beginning Balance at Jun. 30, 2019		1,836,388	$ 573	1,043,065	22,688	830,397	$ (60,112)		1,836,611	(223)
Beginning Balance (in shares) at Jun. 30, 2019			57,239,683
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		3,213	$ 2	3,211					3,213
Issuance of common stock including proceeds from exercise of common stock options (in shares)			172,138
BNCL merger and related items		(25)		0		0	0		0	(25)
Stock-based compensation expense		759		759					759
Repurchase of common stock	[2]	(40,653)					(40,653)		(40,653)
Ending Balance at Sep. 30, 2019		$ 1,856,457	$ 575	$ 1,047,035	$ 32,219	$ 877,928	$ (100,765)		$ 1,856,992	$ (535)
Ending Balance (in shares) at Sep. 30, 2019			57,411,821
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchased (in shares)							959,300

[1] Repurchase of common stock includes 1,230,640 shares repurchased in connection with the Company's share buyback 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 buyback program approved by the Board of Directors.