CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Impact of ASC 326 Adoption	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 Income (Loss)	Accumulated Other Comprehensive Income (Loss) Balance, January 1, 2020 (as adjusted for change in accounting principle)	Retained Earnings	Retained Earnings Impact of ASC 326 Adoption	Retained Earnings Balance, January 1, 2020 (as adjusted for change in accounting principle)	Treasury Stock	Treasury Stock Beneficial	Treasury Stock Balance, January 1, 2020 (as adjusted for change in accounting principle)	Total Stockholders' Equity of WSFS	Total Stockholders' Equity of WSFS Impact of ASC 326 Adoption	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, 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)		12,930									13,023						13,023			(93)
Other comprehensive income (loss)		17,650							17,650								17,650
Cash dividend		(3,451)									(3,451)						(3,451)
Issuance of common stock including proceeds from exercise of common stock options (in shares)					14,515
Issuance of common stock including proceeds from exercise of common stock options		236			$ 0		236										236
Re-issuance of treasury stock in connection with Beneficial merger and related items		949,895					687,898				(92)			262,071			949,877			18
Stock-based compensation expense		550					550										550
Repurchase of common stock	[1]	(9,053)												(9,053)			(9,053)
Ending Balance (in shares) at Mar. 31, 2019					56,941,493
Ending Balance at Mar. 31, 2019		$ 1,789,677			$ 569		1,038,494		2,256		800,511			(52,078)			1,789,752			(75)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)		77,452
Stock repurchased (in shares)															132,993
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)		10,567									10,927						10,927			(360)
Other comprehensive income (loss)		47,033							47,033								47,033
Cash dividend		(6,160)									(6,160)						(6,160)
Issuance of common stock including proceeds from exercise of common stock options (in shares)					70,640
Issuance of common stock including proceeds from exercise of common stock options		991			$ 1		990										991
Stock-based compensation expense		604					604										604
Repurchase of common stock	[2]	(38,739)												(38,739)			(38,739)
Ending Balance (in shares) at Mar. 31, 2020					57,506,298
Ending Balance at Mar. 31, 2020		$ 1,833,419			$ 576		$ 1,050,658		$ 70,534		$ 891,776			$ (178,950)			$ 1,834,594			$ (1,175)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchased (in shares)														1,004,348

[1] Repurchase of common stock includes 77,452 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 1,004,348 shares repurchased in connection with the Company's share repurchase program approved by the Board of Directors.