Stockholders' Equity (Narrative) (Detail) (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2005 Wsfs Capital Trust III [Member]	Dec. 31, 2005 Wsfs Capital Trust III [Member] Libor Rate [Member]	Dec. 31, 2005 Wsfs Capital Trust One [Member]	Dec. 31, 2005 Wsfs Capital Trust One [Member] Libor Rate [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2012 Preferred Stock [Member]
Capital Unit [Line Items]
Tangible capital percentage of adjusted total assets	1.50%	1.50%
Core capital percentage of adjusted total assets	4.00%	4.00%
Tire 1 capital percentage of risk weighted assets	4.00%	4.00%
Risk based capital of risk weighted assets	8.00%	8.00%
Common stock outstanding, par value	$ 0.01	$ 0.01					$ 0.01
Preferred stock, par value								$ 0.01
Pooled Floating Rate Securities Issued			$ 67,000,000		$ 51,500,000
Coupon rate	2.08%
Date of maturity	Jun. 01, 2035
Variable interest rate period					Three-month LIBOR
Variable interest rate				1.77%		2.50%
Cash remains at the holding company	$ 62,200,000