Basis of Presentation - Additional Information (Detail)		6 Months Ended
	May. 18, 2015 $ / shares	Jun. 30, 2015 Office Subsidiary $ / shares shares	Mar. 31, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares
Basis Of Presentation [Line Items]
Number of unconsolidated affiliate		1
Number of banking offices		56
Stock split description		On May 18, 2015, the Company effected a three-for-one stock split in the form of a stock dividend to shareholders of record as of May 4, 2015.
Stock split conversion ratio	3
Stock dividend record date		May 04, 2015
Common stock, shares authorized | shares		65,000,000	65,000,000	65,000,000
Common stock, par value | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Scenario, Previously Reported [Member]
Basis Of Presentation [Line Items]
Common stock, shares authorized | shares			20,000,000
Common stock, par value | $ / shares			$ 0.01
Delaware [Member]
Basis Of Presentation [Line Items]
Number of banking offices		45
Pennsylvania [Member]
Basis Of Presentation [Line Items]
Number of banking offices		9
Virginia [Member]
Basis Of Presentation [Line Items]
Number of banking offices		1
Nevada [Member]
Basis Of Presentation [Line Items]
Number of banking offices		1
WSFS Financial Corporation [Member]
Basis Of Presentation [Line Items]
Number of wholly-owned subsidiaries | Subsidiary		3