SEGMENT INFORMATION - Schedule of Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Interest income	$ 273,384	$ 251,139	$ 800,243	$ 719,291
Noninterest income	90,158	72,668	257,613	202,666
Interest expense	95,880	68,537	273,012	172,315
Noninterest expenses	163,723	139,689	468,563	413,987
Provision for (release of) credit losses	18,422	18,414	53,374	63,255
Income before taxes	85,517	97,167	262,907	272,400
Income tax provision	21,108	22,904	63,567	66,880
Consolidated net income	64,409	74,263	199,340	205,520
Net (loss) income attributable to noncontrolling interest	(26)	97	(129)	272
Net income attributable to WSFS	64,435	74,166	199,469	205,248
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	410,432	366,444	1,193,454	1,039,127
Total expenses	324,915	269,277	930,547	766,727
Income before taxes	85,517	97,167	262,907	272,400
Income tax provision	21,108	22,904	63,567	66,880
Consolidated net income	64,409	74,263	199,340	205,520
Net (loss) income attributable to noncontrolling interest	(26)	97	(129)	272
Net income attributable to WSFS	64,435	74,166	199,469	205,248
Capital expenditures for the period ended	3,638	1,141	10,595	2,953
Operating Segments | WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	306,256	278,488	890,942	791,402
Total expenses	252,815	212,372	717,866	605,510
Income before taxes	53,441	66,116	173,076	185,892
Capital expenditures for the period ended	2,896	1,131	9,289	2,943
Operating Segments | Cash Connect
Segment Reporting Information [Line Items]
Total revenue	32,566	22,070	91,655	61,915
Total expenses	30,937	20,983	87,296	59,261
Income before taxes	1,629	1,087	4,359	2,654
Capital expenditures for the period ended	124	0	247	0
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Total revenue	71,610	65,886	210,857	185,810
Total expenses	41,163	35,922	125,385	101,956
Income before taxes	30,447	29,964	85,472	83,854
Capital expenditures for the period ended	618	10	1,059	10
Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	273,384	251,139	800,243	719,291
Noninterest income	90,158	72,668	257,613	202,666
Total revenue	363,542	323,807	1,057,856	921,957
Interest expense	95,880	68,537	273,012	172,315
Noninterest expenses	163,723	139,689	468,563	413,987
Provision for (release of) credit losses	18,422	18,414	53,374	63,255
Total expenses	278,025	226,640	794,949	649,557
Operating Segments | External Customers | WSFS Bank
Segment Reporting Information [Line Items]
Interest income	267,430	245,520	782,950	703,210
Noninterest income	21,338	18,371	60,198	46,610
Total revenue	288,768	263,891	843,148	749,820
Interest expense	86,768	60,133	241,528	152,582
Noninterest expenses	118,219	105,655	335,488	314,751
Provision for (release of) credit losses	18,426	18,544	53,046	62,589
Total expenses	223,413	184,332	630,062	529,922
Operating Segments | External Customers | Cash Connect
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Noninterest income	31,805	21,231	89,155	59,402
Total revenue	31,805	21,231	89,155	59,402
Interest expense	0	0	0	0
Noninterest expenses	24,481	15,524	70,358	43,562
Provision for (release of) credit losses	0	0	0	0
Total expenses	24,481	15,524	70,358	43,562
Operating Segments | External Customers | Wealth Management
Segment Reporting Information [Line Items]
Interest income	5,954	5,619	17,293	16,081
Noninterest income	37,015	33,066	108,260	96,654
Total revenue	42,969	38,685	125,553	112,735
Interest expense	9,112	8,404	31,484	19,733
Noninterest expenses	21,023	18,510	62,717	55,674
Provision for (release of) credit losses	(4)	(130)	328	666
Total expenses	30,131	26,784	94,529	76,073
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	37,294	34,564	108,857	93,781
Noninterest income	9,596	8,073	26,741	23,389
Total revenue	46,890	42,637	135,598	117,170
Interest expense	37,294	34,564	108,857	93,781
Noninterest expenses	9,596	8,073	26,741	23,389
Total expenses	46,890	42,637	135,598	117,170
Inter-Segment Eliminations | WSFS Bank
Segment Reporting Information [Line Items]
Interest income	8,587	7,213	23,132	20,037
Noninterest income	8,901	7,384	24,662	21,545
Total revenue	17,488	14,597	47,794	41,582
Interest expense	28,707	27,351	85,725	73,744
Noninterest expenses	695	689	2,079	1,844
Total expenses	29,402	28,040	87,804	75,588
Inter-Segment Eliminations | Cash Connect
Segment Reporting Information [Line Items]
Interest income	293	340	1,119	1,058
Noninterest income	468	499	1,381	1,455
Total revenue	761	839	2,500	2,513
Interest expense	4,885	4,068	12,308	11,478
Noninterest expenses	1,571	1,391	4,630	4,221
Total expenses	6,456	5,459	16,938	15,699
Inter-Segment Eliminations | Wealth Management
Segment Reporting Information [Line Items]
Interest income	28,414	27,011	84,606	72,686
Noninterest income	227	190	698	389
Total revenue	28,641	27,201	85,304	73,075
Interest expense	3,702	3,145	10,824	8,559
Noninterest expenses	7,330	5,993	20,032	17,324
Total expenses	$ 11,032	$ 9,138	$ 30,856	$ 25,883