SEGMENT INFORMATION - Schedule of Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Interest income	$ 265,237	$ 241,769	$ 526,859	$ 468,152
Noninterest income	91,598	66,871	167,455	129,998
Interest expense	90,788	59,927	177,132	103,778
Noninterest expenses	155,768	141,253	304,840	274,298
Provision for credit losses	19,814	15,830	34,952	44,841
Income before taxes	90,465	91,630	177,390	175,233
Income tax provision	21,257	23,035	42,459	43,976
Consolidated net income	69,208	68,595	134,931	131,257
Net (loss) income attributable to noncontrolling interest	(65)	(83)	(103)	175
Net income attributable to WSFS	69,273	68,678	135,034	131,082
Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	401,751	348,486	783,022	672,683
Total expenses	311,286	256,856	605,632	497,450
Income before taxes	90,465	91,630	177,390	175,233
Income tax provision	21,257	23,035	42,459	43,976
Consolidated net income	69,208	68,595	134,931	131,257
Net (loss) income attributable to noncontrolling interest	(65)	(83)	(103)	175
Net income attributable to WSFS	69,273	68,678	135,034	131,082
Capital expenditures for the period ended	2,724	956	6,957	1,812
Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	265,237	241,769	526,859	468,152
Noninterest income	91,598	66,871	167,455	129,998
Revenues, Total	356,835	308,640	694,314	598,150
Interest expense	90,788	59,927	177,132	103,778
Noninterest expenses	155,768	141,253	304,840	274,298
Provision for credit losses	19,814	15,830	34,952	44,841
Total expenses	266,370	217,010	516,924	422,917
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	35,686	31,996	71,563	59,217
Noninterest income	9,230	7,850	17,145	15,316
Revenues, Total	44,916	39,846	88,708	74,533
Interest expense	35,686	31,996	71,563	59,217
Noninterest expenses	9,230	7,850	17,145	15,316
Total expenses	44,916	39,846	88,708	74,533
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	298,494	264,480	584,686	512,914
Total expenses	238,567	204,297	465,051	393,138
Income before taxes	59,927	60,183	119,635	119,776
Capital expenditures for the period ended	2,173	956	6,393	1,812
WSFS Bank | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	259,387	236,405	515,520	457,690
Noninterest income	22,640	14,089	38,860	28,239
Revenues, Total	282,027	250,494	554,380	485,929
Interest expense	79,681	53,962	154,760	92,449
Noninterest expenses	110,637	108,147	217,269	209,096
Provision for credit losses	19,800	16,328	34,620	44,045
Total expenses	210,118	178,437	406,649	345,590
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	7,979	6,725	14,545	12,824
Noninterest income	8,488	7,261	15,761	14,161
Revenues, Total	16,467	13,986	30,306	26,985
Interest expense	27,707	25,271	57,018	46,393
Noninterest expenses	742	589	1,384	1,155
Total expenses	28,449	25,860	58,402	47,548
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	31,864	20,810	59,089	39,845
Total expenses	29,886	19,873	56,359	38,278
Income before taxes	1,978	937	2,730	1,567
Capital expenditures for the period ended	123	0	123	0
Cash Connect | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Noninterest income	31,000	19,992	57,350	38,171
Revenues, Total	31,000	19,992	57,350	38,171
Interest expense	0	0	0	0
Noninterest expenses	23,942	14,538	45,877	28,038
Provision for credit losses	0	0	0	0
Total expenses	23,942	14,538	45,877	28,038
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	386	323	826	718
Noninterest income	478	495	913	956
Revenues, Total	864	818	1,739	1,674
Interest expense	4,294	3,851	7,423	7,410
Noninterest expenses	1,650	1,484	3,059	2,830
Total expenses	5,944	5,335	10,482	10,240
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	71,393	63,196	139,247	119,924
Total expenses	42,833	32,686	84,222	66,034
Income before taxes	28,560	30,510	55,025	53,890
Capital expenditures for the period ended	428	0	441	0
Wealth Management | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	5,850	5,364	11,339	10,462
Noninterest income	37,958	32,790	71,245	63,588
Revenues, Total	43,808	38,154	82,584	74,050
Interest expense	11,107	5,965	22,372	11,329
Noninterest expenses	21,189	18,568	41,694	37,164
Provision for credit losses	14	(498)	332	796
Total expenses	32,310	24,035	64,398	49,289
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	27,321	24,948	56,192	45,675
Noninterest income	264	94	471	199
Revenues, Total	27,585	25,042	56,663	45,874
Interest expense	3,685	2,874	7,122	5,414
Noninterest expenses	6,838	5,777	12,702	11,331
Total expenses	$ 10,523	$ 8,651	$ 19,824	$ 16,745