SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Interest income	$ 186,565	$ 109,451	$ 490,722	$ 343,634
Noninterest income	62,651	42,613	195,254	139,453
Total revenue	249,216	152,064	685,976	483,087
Interest expense	9,734	4,960	21,718	18,209
Noninterest expenses	132,917	96,446	441,423	288,097
Provision for (recovery of) credit losses	7,454	(21,310)	34,693	(109,033)
Total expenses	150,105	80,096	497,834	197,273
Income before taxes	99,111	71,968	188,142	285,814
Income tax provision	25,767	17,516	49,929	70,610
Consolidated net income	73,344	54,452	138,213	215,204
Net income attributable to noncontrolling interest	(38)	46	287	49
Net income attributable to WSFS	73,382	54,406	137,926	215,155
Capital expenditures for the period ended			7,665	4,722
Operating Segments
Segment Reporting Information [Line Items]
Interest income	186,565	109,451	490,722	343,634
Noninterest income	62,651	42,613	195,254	139,453
Total revenue	275,419	160,776	744,601	508,811
Interest expense	9,734	4,960	21,718	18,209
Noninterest expenses	132,917	96,446	441,423	288,097
Total expenses	176,308	88,808	556,459	222,997
Income before taxes	99,111	71,968	188,142	285,814
Capital expenditures for the period ended	3,229	1,717	7,665	4,722
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	18,644	4,162	36,733	12,171
Noninterest income	7,559	4,550	21,892	13,553
Total revenue	26,203	8,712	58,625	25,724
Interest expense	18,644	4,162	36,733	12,171
Noninterest expenses	7,559	4,550	21,892	13,553
Total expenses	26,203	8,712	58,625	25,724
WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	200,692	123,122	545,516	398,608
Provision for (recovery of) credit losses	7,463	(19,949)	34,647	(105,927)
Total expenses	121,203	65,257	417,071	153,190
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	183,107	107,226	481,683	337,082
Noninterest income	17,585	15,896	63,833	61,526
Total revenue	212,168	128,059	573,339	412,716
Interest expense	8,923	4,808	20,475	17,695
Noninterest expenses	104,817	80,398	361,949	241,422
Total expenses	135,930	69,032	447,873	164,806
Income before taxes	76,238	59,027	125,466	247,910
Capital expenditures for the period ended	3,213	1,717	7,649	4,722
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	4,570	893	7,720	2,579
Noninterest income	6,906	4,044	20,103	11,529
Total revenue	11,476	4,937	27,823	14,108
Interest expense	14,074	3,269	29,013	9,592
Noninterest expenses	653	506	1,789	2,024
Total expenses	14,727	3,775	30,802	11,616
Cash Connect
Segment Reporting Information [Line Items]
Total revenue	15,416	11,201	37,500	32,116
Provision for (recovery of) credit losses	0	0	0	0
Total expenses	9,646	7,531	25,383	22,117
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Noninterest income	15,416	11,201	37,500	32,116
Total revenue	16,263	11,759	39,868	33,873
Interest expense	0	0	0	0
Noninterest expenses	9,646	7,531	25,383	22,117
Total expenses	14,245	8,938	33,715	26,102
Income before taxes	2,018	2,821	6,153	7,771
Capital expenditures for the period ended	16	0	16	0
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	416	236	1,148	833
Noninterest income	431	322	1,220	924
Total revenue	847	558	2,368	1,757
Interest expense	3,414	245	4,896	632
Noninterest expenses	1,185	1,162	3,436	3,353
Total expenses	4,599	1,407	8,332	3,985
Wealth Management
Segment Reporting Information [Line Items]
Total revenue	33,108	17,741	102,960	52,363
Provision for (recovery of) credit losses	(9)	(1,361)	46	(3,106)
Total expenses	19,256	7,308	55,380	21,966
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	3,458	2,225	9,039	6,552
Noninterest income	29,650	15,516	93,921	45,811
Total revenue	46,988	20,958	131,394	62,222
Interest expense	811	152	1,243	514
Noninterest expenses	18,454	8,517	54,091	24,558
Total expenses	26,133	10,838	74,871	32,089
Income before taxes	20,855	10,120	56,523	30,133
Capital expenditures for the period ended	0	0	0	0
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	13,658	3,033	27,865	8,759
Noninterest income	222	184	569	1,100
Total revenue	13,880	3,217	28,434	9,859
Interest expense	1,156	648	2,824	1,947
Noninterest expenses	5,721	2,882	16,667	8,176
Total expenses	$ 6,877	$ 3,530	$ 19,491	$ 10,123