SEGMENT INFORMATION - Schedule of Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Interest income	$ 261,622	$ 226,383
Noninterest income	75,857	63,127
Interest expense	86,344	43,851
Noninterest expenses	149,072	133,045
Provision for credit losses	15,138	29,011
Income before taxes	86,925	83,603
Income tax provision	21,202	20,941
Consolidated net income	65,723	62,662
Net (loss) income attributable to noncontrolling interest	(38)	258
Net income attributable to WSFS	65,761	62,404
Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	381,271	324,197
Total expenses	294,346	240,594
Income before taxes	86,925	83,603
Income tax provision	21,202	20,941
Consolidated net income	65,723	62,662
Net (loss) income attributable to noncontrolling interest	(38)	258
Net income attributable to WSFS	65,761	62,404
Capital expenditures for the period ended	4,233	856
Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	261,622	226,383
Noninterest income	75,857	63,127
Revenues, Total	337,479	289,510
Interest expense	86,344	43,851
Noninterest expenses	149,072	133,045
Provision for credit losses	15,138	29,011
Total expenses	250,554	205,907
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	35,877	27,221
Noninterest income	7,915	7,466
Revenues, Total	43,792	34,687
Interest expense	35,877	27,221
Noninterest expenses	7,915	7,466
Total expenses	43,792	34,687
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	286,192	248,434
Total expenses	226,484	188,841
Income before taxes	59,708	59,593
Capital expenditures for the period ended	4,220	856
WSFS Bank | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	256,133	221,285
Noninterest income	16,220	14,150
Revenues, Total	272,353	235,435
Interest expense	75,079	38,487
Noninterest expenses	106,632	100,949
Provision for credit losses	14,820	27,717
Total expenses	196,531	167,153
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	6,566	6,099
Noninterest income	7,273	6,900
Revenues, Total	13,839	12,999
Interest expense	29,311	21,122
Noninterest expenses	642	566
Total expenses	29,953	21,688
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	27,225	19,035
Total expenses	26,473	18,405
Income before taxes	752	630
Capital expenditures for the period ended	0	0
Cash Connect | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	0	0
Noninterest income	26,350	18,179
Revenues, Total	26,350	18,179
Interest expense	0	0
Noninterest expenses	21,935	13,500
Provision for credit losses	0	0
Total expenses	21,935	13,500
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	440	395
Noninterest income	435	461
Revenues, Total	875	856
Interest expense	3,129	3,559
Noninterest expenses	1,409	1,346
Total expenses	4,538	4,905
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Revenues, Total	67,854	56,728
Total expenses	41,389	33,348
Income before taxes	26,465	23,380
Capital expenditures for the period ended	13	0
Wealth Management | Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	5,489	5,098
Noninterest income	33,287	30,798
Revenues, Total	38,776	35,896
Interest expense	11,265	5,364
Noninterest expenses	20,505	18,596
Provision for credit losses	318	1,294
Total expenses	32,088	25,254
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	28,871	20,727
Noninterest income	207	105
Revenues, Total	29,078	20,832
Interest expense	3,437	2,540
Noninterest expenses	5,864	5,554
Total expenses	$ 9,301	$ 8,094