Segment Information - Details of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Interest income	$ 38,333	$ 37,116	$ 35,882	$ 35,591	$ 36,787	$ 36,514	$ 37,763	$ 39,223	$ 146,922	$ 150,287	$ 158,642
Noninterest income	19,796	22,742	19,539	18,074	21,195	19,748	28,992	16,758	80,151	86,693	63,588
Total revenue									243,725	256,178	241,080
Interest expense	3,787	3,710	3,826	4,011	5,289	5,621	5,685	6,693	15,334	23,288	32,605
Noninterest expenses	34,598	32,809	33,152	32,370	37,186	32,153	33,017	30,989	132,929	133,345	127,477
Provision for loan loss	1,292	1,969	1,680	2,231	3,674	3,751	16,383	8,245	7,172	32,053	27,996
Total expenses									172,087	207,884	206,928
Income before taxes	18,452	21,370	16,763	15,053	11,833	14,737	11,670	10,054	71,638	48,294	34,152
Income tax provision	6,378	7,210	5,855	5,313	4,275	4,758	4,340	3,610	24,756	16,983	11,475
Consolidated net income	12,074	14,160	10,908	9,740	7,558	9,979	7,330	6,444	46,882	31,311	22,677
Capital expenditures									2,860	8,228	10,494
Cash and cash equivalents	484,426				500,887				484,426	500,887	468,017	376,759
Other segment assets	4,031,337				3,874,261				4,031,337	3,874,261	3,820,991
Total assets	4,515,763				4,375,148				4,515,763	4,375,148	4,289,008
External Customer [Member]
Segment Reporting Information [Line Items]
Interest income									146,922	150,287	158,642
Noninterest income									80,151	86,693	63,588
Total revenue									227,073	236,980	222,230
Interest expense									15,334	23,288	32,605
Noninterest expenses									132,929	133,345	127,477
Provision for loan loss									7,172	32,053	27,996
Total expenses									155,435	188,686	188,078
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income									9,352	9,751	10,536
Noninterest income									7,300	9,447	8,314
Total revenue									16,652	19,198	18,850
Interest expense									9,352	9,751	10,536
Noninterest expenses									7,300	9,447	8,314
Total expenses									16,652	19,198	18,850
WSFS Bank [Member]
Segment Reporting Information [Line Items]
Total revenue									189,510	208,806	196,133
Total expenses									135,401	173,293	173,036
Income before taxes									54,109	35,513	23,097
Capital expenditures									2,232	7,796	8,877
WSFS Bank [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Interest income									139,082	141,986	149,313
Noninterest income									40,479	54,225	34,959
Total revenue									179,561	196,211	184,272
Interest expense									14,744	22,397	31,345
Noninterest expenses									107,195	112,071	108,061
Provision for loan loss									6,759	32,222	26,641
Total expenses									128,698	166,690	166,047
Cash and cash equivalents	73,017				68,419				73,017	68,419	48,107
Other segment assets	3,838,525				3,683,073				3,838,525	3,683,073	3,618,744
Total assets	3,911,542				3,751,492				3,911,542	3,751,492	3,666,851
WSFS Bank [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income									3,603	4,032	4,414
Noninterest income									6,346	8,563	7,447
Total revenue									9,949	12,595	11,861
Interest expense									5,749	5,719	6,122
Noninterest expenses									954	884	867
Total expenses									6,703	6,603	6,989
Cash Connect [Member]
Segment Reporting Information [Line Items]
Total revenue									24,591	19,528	16,342
Total expenses									16,728	13,136	10,696
Income before taxes									7,863	6,392	5,646
Capital expenditures									628	405	1,291
Cash Connect [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Interest income
Noninterest income									23,746	18,749	15,618
Total revenue									23,746	18,749	15,618
Interest expense
Noninterest expenses									12,950	9,549	7,883
Provision for loan loss
Total expenses									12,950	9,549	7,883
Cash and cash equivalents	408,096				430,382				408,096	430,382	416,949
Other segment assets	1,965				1,605				1,965	1,605	2,155
Total assets	410,061				431,987				410,061	431,987	419,104
Cash Connect [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income
Noninterest income									845	779	724
Total revenue									845	779	724
Interest expense									1,541	1,368	1,235
Noninterest expenses									2,237	2,219	1,578
Total expenses									3,778	3,587	2,813
Trust & Wealth Management [Member]
Segment Reporting Information [Line Items]
Total revenue									29,624	27,844	28,605
Total expenses									19,958	21,455	23,196
Income before taxes									9,666	6,389	5,409
Capital expenditures										27	326
Trust & Wealth Management [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Interest income									7,840	8,301	9,329
Noninterest income									15,926	13,719	13,011
Total revenue									23,766	22,020	22,340
Interest expense									590	891	1,260
Noninterest expenses									12,784	11,725	11,533
Provision for loan loss									413	(169)	1,355
Total expenses									13,787	12,447	14,148
Cash and cash equivalents	3,313				2,086				3,313	2,086	2,961
Other segment assets	190,847				189,583				190,847	189,583	200,092
Total assets	194,160				191,669				194,160	191,669	203,053
Trust & Wealth Management [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income									5,749	5,719	6,122
Noninterest income									109	105	143
Total revenue									5,858	5,824	6,265
Interest expense									2,062	2,664	3,179
Noninterest expenses									4,109	6,344	5,869
Total expenses									$ 6,171	$ 9,008	$ 9,048