BASIS OF PRESENTATION (Details)	Sep. 30, 2019 subsidiary Office
Basis Of Presentation [Line Items]
Number of unconsolidated affiliate | subsidiary	1
Number of majority-owned subsidiary | subsidiary	1
Number of banking offices	127
Delaware
Basis Of Presentation [Line Items]
Number of banking offices	49
Pennsylvania
Basis Of Presentation [Line Items]
Number of banking offices	56
New Jersey
Basis Of Presentation [Line Items]
Number of banking offices	20
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