BASIS OF PRESENTATION (Details) $ in Thousands	Mar. 31, 2022 USD ($) subsidiary office	Dec. 31, 2021 USD ($)
Basis Of Presentation [Line Items]
Number of unconsolidated subsidiary | subsidiary	3
Number of majority-owned subsidiary | subsidiary	1
Net loans and leases | $	$ 11,197,482	$ 7,791,482
Number of banking offices	122
KCMI
Basis Of Presentation [Line Items]
Net loans and leases | $	$ 55,500
Pennsylvania
Basis Of Presentation [Line Items]
Number of banking offices	63
Delaware
Basis Of Presentation [Line Items]
Number of banking offices	39
New Jersey
Basis Of Presentation [Line Items]
Number of banking offices	18
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	5