Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Beneficial	Cumulative change in accounting principle (Note 2)	Balance, January 1, 2020 (as adjusted for change in accounting principle)	Common Stock	Common Stock Balance, January 1, 2020 (as adjusted for change in accounting principle)	Capital in Excess of Par Value	Capital in Excess of Par Value Balance, January 1, 2020 (as adjusted for change in accounting principle)	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Balance, January 1, 2020 (as adjusted for change in accounting principle)	Accumulated Other Comprehensive (Loss) Income Reclassification due to the adoption of ASU No. 2016-01	Retained Earnings	Retained Earnings Cumulative change in accounting principle (Note 2)	Retained Earnings Balance, January 1, 2020 (as adjusted for change in accounting principle)	Retained Earnings Reclassification due to the adoption of ASU No. 2016-01	Treasury Stock	Treasury Stock Balance, January 1, 2020 (as adjusted for change in accounting principle)	Total Stockholders’ Equity of WSFS	Total Stockholders’ Equity of WSFS Cumulative change in accounting principle (Note 2)	Total Stockholders’ Equity of WSFS Balance, January 1, 2020 (as adjusted for change in accounting principle)	Non-controlling Interest	Non-controlling Interest Balance, January 1, 2020 (as adjusted for change in accounting principle)
Beginning Balance (in shares) at Dec. 31, 2017						56,279,527
Beginning balance at Dec. 31, 2017		$ 724,345				$ 563		$ 336,271		$ (8,152)		$ 20	$ 669,557			$ (20)	$ (273,894)		$ 724,345			$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		134,743											134,743						134,743			0
Other comprehensive income (loss)		(7,242)								(7,262)									(7,262)
Cash dividend		(13,249)											(13,249)						(13,249)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						647,451
Issuance of common stock including proceeds from exercise of common stock options		11,253				$ 6		11,247											11,253
Stock-based compensation expense		2,292						2,292											2,292
Repurchases of common stock		(31,202)															(31,202)		(31,202)
Ending Balance (in shares) at Dec. 31, 2018						56,926,978
Ending 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]
Accounting standards update extensible list		us-gaap:AccountingStandardsUpdate201601Member
Repurchases of common stock (in shares)		691,742
Net income		$ 147,918											148,809						148,809			(891)
Other comprehensive income (loss)		38,895								38,895									38,895
Cash dividend		(22,463)											(22,463)						(22,463)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						508,680
Issuance of common stock including proceeds from exercise of common stock options		7,755				$ 6		7,749											7,755
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		3,608						3,608											3,608
Repurchases of common stock	[1]	(97,186)															(97,186)		(97,186)
Ending Balance (in shares) at Dec. 31, 2019						57,435,658	57,435,658
Ending 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]
Repurchases of common stock (in shares)		2,132,390
Shares repurchased in buy back program (in shares)			132,993
Net income		$ 113,320											114,774						114,774			(1,454)
Other comprehensive income (loss)		32,506								32,506									32,506
Cash dividend		(24,369)											(24,369)						(24,369)
Issuance of common stock including proceeds from exercise of common stock options (in shares)						140,125
Issuance of common stock including proceeds from exercise of common stock options		2,032				$ 1		2,031											2,032
Contributions from noncontrolling shareholders		23																				23
Stock-based compensation expense		2,677						2,677											2,677
Repurchases of common stock	[1]	(155,832)						(750)									(155,082)		(155,832)
Ending Balance (in shares) at Dec. 31, 2020						57,575,783
Ending balance at Dec. 31, 2020		$ 1,789,480				$ 576		$ 1,053,022		$ 56,007			$ 977,414				$ (295,293)		$ 1,791,726			$ (2,246)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchases of common stock (in shares)																	3,950,855
Shares repurchased in buy back program (in shares)			24,910

[1] Repurchase of common stock for the years ended December 31, 2020 and 2019 included 3,950,855 and 2,132,390 shares repurchased, respectively, in connection with the Company's share buyback program approved by the Board of Directors, and 24,910 and 132,993 shares repurchased, respectively, to cover taxes due on the consideration transferred in the Beneficial acquisition related to the vesting of unrestricted Beneficial stock awards.