Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended				3 Months Ended		12 Months Ended	3 Months Ended				3 Months Ended
	Mar. 31, 2014 Office	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Stock Incentive 2013 Plan [Member]	Mar. 31, 2014 Stock Incentive 2005 Plan [Member]	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2014 Performance Stock Awards [Member] Person	Dec. 31, 2013 Performance Stock Awards [Member]	Mar. 31, 2014 Director [Member]	Mar. 31, 2013 Director [Member]	Mar. 31, 2014 WSFS Bank [Member] Subsidiary	Mar. 31, 2014 Montchanin [Member] Subsidiary	Mar. 31, 2014 WSFS Capital Trust III [Member] Affiliates	Mar. 31, 2014 Delaware [Member] Office	Mar. 31, 2014 Pennsylvania [Member] Office	Mar. 31, 2014 Virginia [Member] Office	Mar. 31, 2014 Nevada [Member] Office
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of wholly-owned subsidiaries														2	1
Number of unconsolidated affiliate																1
Number of offices	52																42	8	1	1
Stock option plan termination description							The 2013 Plan will terminate on the tenth anniversary of its effective date, after which no awards may be granted.
Number of shares reserved for issuance under 2013 Plan	735,898	435,804	712,578	335,730			698,845
Shares available for future grants under Plan							366,412	0
Stock Options granted, vest in percentage per annum increments	25.00%
Stock option exercisable period description	Start to become exercisable one year from the grant date
Performance award vesting period					5 years	7 years			4 years	4 years		5 years
Total compensation cost to be recognized of non-vested stock options	$ 6,300,000
Expected weighted-average period	3 years 8 months 12 days
Restricted stock units and awards issued									46,249	36,152
Total amount of compensation cost of relating to non-vested restricted stock									1,700,000
Weighted-average remaining contractual life									2 years 6 months
Aggregate shares of restricted stock awarded										77,800
Number of participants under Long-Term Program										14
Percentage of annual return on assets											1.00%
Vesting description										The awarded stock will vest in 25% increments over four years
Stock-based compensation expense										88,000
Restricted stock granted												22,250
Shares vesting period	Two year
Return on investment of cost of restricted stock	50.00%
Compensation expense												69,000	69,000
Restricted stock vested, shares	5,563
Stock-based compensation expenses, pre-tax	802,000	946,000
Stock-based compensation expenses, after tax	$ 577,000	$ 804,000
Stock-based compensation expenses, per share	$ 0.06	$ 0.09