SEGMENT INFORMATION - Details of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Interest income	$ 1,063,582	$ 976,522	$ 703,815
Interest expense	358,144	251,419	40,925
Net interest income	705,438	725,103	662,890
Noninterest income	340,920	289,871	260,134
Provision for (recovery of) credit losses	61,410	88,071	48,089
Salaries, benefits and other compensation	332,682	289,193	283,905
Occupancy expense	37,579	42,184	40,885
Equipment expense	47,744	42,242	40,994
Professional fees	20,164	21,200	18,497
Noninterest expenses	637,689	561,633	574,326
Income before taxes	347,259	365,270	300,609
Income tax provision	83,764	96,245	77,961
Consolidated net income	263,495	269,025	222,648
Net (loss) income attributable to noncontrolling interest	(176)	(131)	273
Net income attributable to WSFS	263,671	269,156	222,375
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	1,083,238	1,046,671	952,822
Total expenses	735,979	681,401	652,213
Income before taxes	347,259	365,270	300,609
Income tax provision	83,764	96,245	77,961
Consolidated net income	263,495	269,025	222,648
Net (loss) income attributable to noncontrolling interest	(176)	(131)	273
Net income attributable to WSFS	263,671	269,156	222,375
Capital expenditures for the period ended	14,258	6,406	8,809
Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	1,063,582	976,522	703,815
Interest expense	358,144	251,419	40,925
Net interest income	705,438	725,103	662,890
Noninterest income	340,920	289,871	260,134
Total revenue	1,046,358	1,014,974	923,024
Provision for (recovery of) credit losses	61,410	88,071	48,089
Salaries, benefits and other compensation	332,682	289,193	283,905
Occupancy expense	37,579	42,184	40,885
Equipment expense	47,744	42,242	40,994
Professional fees	20,164	19,054	20,876
Other segment items	199,520	168,960	187,666
Total expenses	699,099	649,704	622,415
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	145,806	128,481	62,423
Interest expense	145,806	128,481	62,423
Net interest income	0	0	0
Noninterest income	36,880	31,697	29,798
Total revenue	36,880	31,697	29,798
Total expenses	36,880	31,697	29,798
Noninterest expenses	36,880	31,697	29,798
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	750,156	765,410	726,994
Total expenses	522,497	515,730	516,184
Income before taxes	227,659	249,680	210,810
Capital expenditures for the period ended	12,305	6,335	8,793
WSFS Bank | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	1,040,192	955,050	690,780
Interest expense	318,484	221,713	37,393
Net interest income	721,708	733,337	653,387
Noninterest income	78,249	74,951	79,800
Total revenue	799,957	808,288	733,187
Provision for (recovery of) credit losses	60,710	87,529	47,921
Salaries, benefits and other compensation	264,281	229,740	226,354
Occupancy expense	36,486	40,694	39,362
Equipment expense	38,607	35,657	37,280
Professional fees	15,286	11,418	15,485
Other segment items	104,180	108,194	147,518
Total expenses	519,550	513,232	513,920
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	31,036	28,202	14,348
Interest expense	114,770	100,279	48,075
Net interest income	(83,734)	(72,077)	(33,727)
Noninterest income	33,933	29,199	27,534
Total revenue	(49,801)	(42,878)	(6,193)
Total expenses	2,947	2,498	2,264
Noninterest expenses	2,947	2,498	2,264
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	101,170	69,434	48,834
Total expenses	100,171	65,199	41,497
Income before taxes	999	4,235	7,337
Capital expenditures for the period ended	204	0	16
Cash Connect | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	0	0	0
Interest expense	0	0	0
Net interest income	0	0	0
Noninterest income	114,539	82,468	55,519
Total revenue	114,539	82,468	55,519
Provision for (recovery of) credit losses	0	0	0
Salaries, benefits and other compensation	10,209	9,395	8,113
Occupancy expense	28	296	299
Equipment expense	0	0	0
Professional fees	0	0	0
Other segment items	83,641	49,794	28,365
Total expenses	93,878	59,485	36,777
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	1,441	1,384	1,536
Interest expense	16,645	16,348	9,831
Net interest income	(15,204)	(14,964)	(8,295)
Noninterest income	1,835	1,930	1,610
Total revenue	(13,369)	(13,034)	(6,685)
Total expenses	6,293	5,714	4,720
Noninterest expenses	6,293	5,714	4,720
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	231,912	211,827	176,994
Total expenses	113,311	100,472	94,532
Income before taxes	118,601	111,355	82,462
Capital expenditures for the period ended	1,749	71	0
Wealth Management | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	23,390	21,472	13,035
Interest expense	39,660	29,706	3,532
Net interest income	(16,270)	(8,234)	9,503
Noninterest income	148,132	132,452	124,815
Total revenue	131,862	124,218	134,318
Provision for (recovery of) credit losses	700	542	168
Salaries, benefits and other compensation	58,192	50,058	49,438
Occupancy expense	1,065	1,194	1,224
Equipment expense	9,137	6,585	3,714
Professional fees	4,878	7,636	5,391
Other segment items	11,699	10,972	11,783
Total expenses	85,671	76,987	71,718
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	113,329	98,895	46,539
Interest expense	14,391	11,854	4,517
Net interest income	98,938	87,041	42,022
Noninterest income	1,112	568	654
Total revenue	100,050	87,609	42,676
Total expenses	27,640	23,485	22,814
Noninterest expenses	$ 27,640	$ 23,485	$ 22,814