BASIS OF PRESENTATION (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares	Sep. 30, 2018 Subsidiary Office
Basis Of Presentation [Line Items]
Number of unconsolidated affiliate | Subsidiary		1
Number of banking offices		77
Scenario, Forecast
Basis Of Presentation [Line Items]
Shares issued per acquiree share, ratio	0.3013
Cash paid per acquiree share (in dollars per share) | $ / shares	$ 2.93
Delaware
Basis Of Presentation [Line Items]
Number of banking offices		46
Pennsylvania
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		3