BASIS OF PRESENTATION (Details)	Mar. 31, 2019 Subsidiary Office
Basis Of Presentation [Line Items]
Number of unconsolidated affiliate | Subsidiary	1
Number of banking offices	152
Delaware
Basis Of Presentation [Line Items]
Number of banking offices	49
Pennsylvania
Basis Of Presentation [Line Items]
Number of banking offices	72
New Jersey
Basis Of Presentation [Line Items]
Number of banking offices	29
Virginia
Basis Of Presentation [Line Items]
Number of banking offices	1
Nevada
Basis Of Presentation [Line Items]
Number of banking offices	1
WSFS Financial Corporation
Basis Of Presentation [Line Items]
Number of wholly-owned subsidiaries | Subsidiary	4