CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative change in accounting principle	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)	Retained Earnings	Retained Earnings Cumulative change in accounting principle	Retained Earnings Balance, January 1, 2020 (as adjusted for change in accounting principle)	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	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, 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		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
Repurchases of common shares	[1]	(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]
Repurchase of common stock (in shares)		1,004,348
Beginning Balance (in shares) at Dec. 31, 2020					57,575,783
Beginning 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]
Net income		65,141									65,082					65,082			59
Other comprehensive income (loss)		(69,709)							(69,709)							(69,709)
Cash dividend		(5,699)									(5,699)					(5,699)
Issuance of common stock including proceeds from exercise of common stock options (in shares)					13,547
Issuance of common stock including proceeds from exercise of common stock options		115			$ 0		115									115
Stock-based compensation expense		1,155					1,155									1,155
Repurchases of common shares	[2]	(12,029)					(1)							(12,028)		(12,029)
Ending Balance (in shares) at Mar. 31, 2021					57,589,330
Ending Balance at Mar. 31, 2021		$ 1,768,454			$ 576		$ 1,054,291		$ (13,702)		$ 1,036,797			$ (307,321)		$ 1,770,641			$ (2,187)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)														267,309
Shares withheld for tax liabilities (in shares)		20

[1] 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.

[2] Repurchase of common stock includes 267,309 shares repurchased in connection with the Company's share repurchase program approved by the Board of Directors, and 20 shares withheld to cover tax liabilities