| Cover | Dec. 27, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 27, 2021 |
| Entity File Number | 001-35638 |
| Entity Registrant Name | WSFS FINANCIAL CORPORATION |
| Entity Central Index Key | 0000828944 |
| Entity Tax Identification Number | 22-2866913 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | WSFS |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
