SEGMENT INFORMATION - Details of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Interest income	$ 703,815	$ 456,369	$ 514,405
Noninterest income	260,134	185,480	201,025
Total revenue	963,949	641,849	715,430
Interest expense	40,925	22,720	48,450
Noninterest expenses	574,326	378,516	368,844
Provision for (recovery of) credit losses	48,089	(117,087)	153,180
Total expenses	663,340	284,149	570,474
Income before taxes	300,609	357,700	144,956
Income tax provision	77,961	86,095	31,636
Net income	222,648	271,605	113,320
Less: Net income (loss) attributable to noncontrolling interest	273	163	(1,454)
Net income attributable to WSFS	222,375	271,442	114,774
Capital expenditures	8,809	6,576	7,159
Operating Segments
Segment Reporting Information [Line Items]
Interest income	703,815	456,369	514,405
Noninterest income	260,134	185,480	201,025
Total revenue	1,056,170	676,981	747,663
Interest expense	40,925	22,720	48,450
Noninterest expenses	574,326	378,516	368,844
Total expenses	755,561	319,281	602,707
Income before taxes	300,609	357,700	144,956
Capital expenditures	8,809	6,576	7,159
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	62,423	16,550	16,528
Noninterest income	29,798	18,582	15,705
Total revenue	92,221	35,132	32,233
Interest expense	62,423	16,550	16,528
Noninterest expenses	29,798	18,582	15,705
Total expenses	92,221	35,132	32,233
WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	770,580	526,852	615,843
Provision for (recovery of) credit losses	47,921	(113,715)	149,453
Total expenses	551,313	236,620	506,680
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	690,780	447,542	505,258
Noninterest income	79,800	79,310	110,585
Total revenue	812,462	546,300	633,811
Interest expense	37,393	22,058	46,428
Noninterest expenses	465,999	328,277	310,799
Total expenses	601,652	252,304	520,945
Income before taxes	210,810	293,996	112,866
Capital expenditures	8,793	6,344	6,499
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	14,348	3,460	4,930
Noninterest income	27,534	15,988	13,038
Total revenue	41,882	19,448	17,968
Interest expense	48,075	13,090	11,598
Noninterest expenses	2,264	2,594	2,667
Total expenses	50,339	15,684	14,265
Cash Connect
Segment Reporting Information [Line Items]
Total revenue	55,519	42,818	40,899
Provision for (recovery of) credit losses	0	0	0
Total expenses	36,777	29,465	28,421
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0
Noninterest income	55,519	42,818	40,899
Total revenue	58,665	45,146	42,585
Interest expense	0	0	0
Noninterest expenses	36,777	29,465	28,421
Total expenses	51,328	34,957	33,341
Income before taxes	7,337	10,189	9,244
Capital expenditures	16	232	420
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	1,536	1,088	851
Noninterest income	1,610	1,240	835
Total revenue	3,146	2,328	1,686
Interest expense	9,831	856	1,580
Noninterest expenses	4,720	4,636	3,340
Total expenses	14,551	5,492	4,920
Wealth Management
Segment Reporting Information [Line Items]
Total revenue	137,850	72,179	58,688
Provision for (recovery of) credit losses	168	(3,372)	3,727
Total expenses	75,250	18,064	35,373
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	13,035	8,827	9,147
Noninterest income	124,815	63,352	49,541
Total revenue	185,043	85,535	71,267
Interest expense	3,532	662	2,022
Noninterest expenses	71,550	20,774	29,624
Total expenses	102,581	32,020	48,421
Income before taxes	82,462	53,515	22,846
Capital expenditures	0	0	240
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	46,539	12,002	10,747
Noninterest income	654	1,354	1,832
Total revenue	47,193	13,356	12,579
Interest expense	4,517	2,604	3,350
Noninterest expenses	22,814	11,352	9,698
Total expenses	$ 27,331	$ 13,956	$ 13,048