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COVER PAGE - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-35638    
Entity Registrant Name WSFS FINANCIAL CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 22-2866913    
Entity Address, Address Line One 500 Delaware Avenue    
Entity Address, City or Town Wilmington    
Entity Address, State or Province DE    
Entity Address, Postal Zip Code 19801    
City Area Code 302    
Local Phone Number 792-6000    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol WSFS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Public Float     $ 2,168,596,590
Entity Common Stock, Shares Outstanding   51,056,811  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s Proxy Statement for the Annual Meeting of Stockholders to be held on April 23, 2020 are incorporated by reference in Part III hereof.
    
Entity Central Index Key 0000828944    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY