BASIS OF PRESENTATION (Details)	Mar. 31, 2021 subsidiary Office
Basis Of Presentation [Line Items]
Number of unconsolidated affiliate | subsidiary	1
Number of majority-owned subsidiary | subsidiary	1
Number of banking offices	111
Pennsylvania
Basis Of Presentation [Line Items]
Number of banking offices	51
Delaware
Basis Of Presentation [Line Items]
Number of banking offices	42
New Jersey
Basis Of Presentation [Line Items]
Number of banking offices	16
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	3