Segment Information - Details of Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Interest income	$ 39,413	$ 35,882	$ 77,198	$ 71,473
Noninterest income	19,623	19,539	37,987	37,613
Total revenue	59,036	55,421	115,185	109,086
Interest expense	3,936	3,826	7,677	7,837
Noninterest expenses	35,518	33,152	69,696	65,522
Provision for loan loss	50	1,680	2,680	3,911
Total expenses	39,504	38,658	80,053	77,270
Income before taxes	19,532	16,763	35,132	31,816
Provision for income taxes	6,807	5,855	5,496	11,168
Consolidated net income	12,725	10,908	29,636	20,648
Capital expenditures	848	549	1,388	1,505
Cash and cash equivalents	475,189	537,522	475,189	537,522	484,426	500,887
Other segment assets	4,137,901		4,137,901		4,031,337
Total assets	4,613,090		4,613,090		4,515,763
Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	2,176	2,282	4,428	4,616
Noninterest income	1,942	1,952	3,899	3,828
Total revenue	4,118	4,234	8,327	8,444
Interest expense	2,176	2,282	4,428	4,616
Noninterest expenses	1,942	1,952	3,899	3,828
Total expenses	4,118	4,234	8,327	8,444
External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	63,154	59,655	123,512	117,530
Total expenses	43,622	42,892	88,380	85,714
WSFS Bank [Member]
Segment Reporting Information [Line Items]
Interest income	37,480	33,961	73,401	67,561
Noninterest income	8,778	9,333	17,173	18,560
Total revenue	46,258	43,294	90,574	86,121
Interest expense	3,831	3,693	7,461	7,533
Noninterest expenses	28,610	26,731	56,222	53,161
Provision for loan loss	(201)	1,535	2,122	3,781
Total expenses	32,240	31,959	65,805	64,475
Income before taxes	14,990	12,331	26,670	23,538
Capital expenditures	815	272	1,293	1,045
Cash and cash equivalents	89,284		89,284		73,017
Other segment assets	3,941,531		3,941,531		3,838,525
Total assets	4,030,815		4,030,815		3,911,542
WSFS Bank [Member] | Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	834	914	1,665	1,817
Noninterest income	1,711	1,701	3,449	3,351
Total revenue	2,545	2,615	5,114	5,168
Interest expense	1,342	1,368	2,763	2,799
Noninterest expenses	231	251	450	477
Total expenses	1,573	1,619	3,213	3,276
WSFS Bank [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	48,803	45,909	95,688	91,289
Total expenses	33,813	33,578	69,018	67,751
Cash Connect [Member]
Segment Reporting Information [Line Items]
Noninterest income	6,320	6,025	12,334	11,052
Total revenue	6,320	6,025	12,334	11,052
Noninterest expenses	3,882	3,167	7,432	6,159
Total expenses	3,882	3,167	7,432	6,159
Income before taxes	1,721	2,138	3,461	3,452
Capital expenditures	33	277	89	460
Cash and cash equivalents	383,072		383,072		408,096
Other segment assets	2,401		2,401		1,965
Total assets	385,473		385,473		410,061
Cash Connect [Member] | Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Noninterest income	204	223	397	423
Total revenue	204	223	397	423
Interest expense	328	405	659	776
Noninterest expenses	593	538	1,179	1,088
Total expenses	921	943	1,838	1,864
Cash Connect [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	6,524	6,248	12,731	11,475
Total expenses	4,803	4,110	9,270	8,023
Trust & Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	1,933	1,921	3,797	3,912
Noninterest income	4,525	4,181	8,480	8,001
Total revenue	6,458	6,102	12,277	11,913
Interest expense	105	133	216	304
Noninterest expenses	3,026	3,254	6,042	6,202
Provision for loan loss	251	145	558	130
Total expenses	3,382	3,532	6,816	6,636
Income before taxes	2,821	2,294	5,001	4,826
Capital expenditures			3
Cash and cash equivalents	2,833		2,833		3,313
Other segment assets	193,969		193,969		190,847
Total assets	196,802		196,802		194,160
Trust & Wealth Management [Member] | Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	1,342	1,368	2,763	2,799
Noninterest income	27	28	53	54
Total revenue	1,369	1,396	2,816	2,853
Interest expense	506	509	1,006	1,041
Noninterest expenses	1,118	1,163	2,270	2,263
Total expenses	1,624	1,672	3,276	3,304
Trust & Wealth Management [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	7,827	7,498	15,093	14,766
Total expenses	$ 5,006	$ 5,204	$ 10,092	$ 9,940