SEGMENT INFORMATION - Schedule of Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Interest income	$ 250,878	$ 261,622
Interest expense	75,662	86,344
Net interest income	175,216	175,278
Noninterest income	80,897	75,857
Provision for credit losses	17,350	15,138
Salaries, benefits and other compensation	82,477	75,806
Occupancy expense	9,893	9,479
Equipment expense	12,728	10,692
Professional fees	4,698	4,481
Noninterest expenses	151,795	149,072
Income before taxes	86,968	86,925
Income tax provision	21,101	21,202
Consolidated net income	65,867	65,723
Net loss attributable to noncontrolling interest	(29)	(38)
Net income attributable to WSFS	65,896	65,761
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	264,947	259,050
Total expenses	177,979	172,125
Income before taxes	86,968	86,925
Income tax provision	21,101	21,202
Consolidated net income	65,867	65,723
Net loss attributable to noncontrolling interest	(29)	(38)
Net income attributable to WSFS	65,896	65,761
Capital expenditures for the period ended	2,431	4,233
Operating Segments | WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	183,332	181,802
Total expenses	127,272	122,094
Income before taxes	56,060	59,708
Capital expenditures for the period ended	2,021	4,220
Operating Segments | Cash Connect
Segment Reporting Information [Line Items]
Total revenue	21,457	24,096
Total expenses	19,903	23,344
Income before taxes	1,554	752
Capital expenditures for the period ended	42	0
Operating Segments | Wealth and Trust
Segment Reporting Information [Line Items]
Total revenue	60,158	53,152
Total expenses	30,804	26,687
Income before taxes	29,354	26,465
Capital expenditures for the period ended	368	13
Operating Segments | External Customers
Segment Reporting Information [Line Items]
Interest income	250,878	261,622
Interest expense	75,662	86,344
Net interest income	175,216	175,278
Noninterest income	80,897	75,857
Total revenue	256,113	251,135
Provision for credit losses	17,350	15,138
Salaries, benefits and other compensation	82,477	75,806
Occupancy expense	9,893	9,479
Equipment expense	12,728	10,692
Professional fees	4,698	4,481
Other segment items	41,999	48,614
Total expenses	169,145	164,210
Operating Segments | External Customers | WSFS Bank
Segment Reporting Information [Line Items]
Interest income	244,877	256,133
Interest expense	67,933	75,079
Net interest income	176,944	181,054
Noninterest income	16,695	16,220
Total revenue	193,639	197,274
Provision for credit losses	16,511	14,820
Salaries, benefits and other compensation	63,937	52,295
Occupancy expense	9,525	9,213
Equipment expense	10,046	7,814
Professional fees	3,185	2,406
Other segment items	23,456	34,904
Total expenses	126,660	121,452
Operating Segments | External Customers | Cash Connect
Segment Reporting Information [Line Items]
Interest income	0	0
Interest expense	0	0
Net interest income	0	0
Noninterest income	24,535	26,350
Total revenue	24,535	26,350
Provision for credit losses	0	0
Salaries, benefits and other compensation	2,621	2,554
Occupancy expense	0	14
Equipment expense	0	0
Professional fees	0	0
Other segment items	15,837	19,367
Total expenses	18,458	21,935
Operating Segments | External Customers | Wealth and Trust
Segment Reporting Information [Line Items]
Interest income	6,001	5,489
Interest expense	7,729	11,265
Net interest income	(1,728)	(5,776)
Noninterest income	39,667	33,287
Total revenue	37,939	27,511
Provision for credit losses	839	318
Salaries, benefits and other compensation	15,919	13,957
Occupancy expense	368	252
Equipment expense	2,682	1,558
Professional fees	1,513	1,733
Other segment items	2,706	3,005
Total expenses	24,027	20,823
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	33,597	35,877
Interest expense	33,597	35,877
Net interest income	0	0
Noninterest income	8,834	7,915
Total revenue	8,834	7,915
Total expenses	8,834	7,915
Noninterest expenses	8,834	7,915
Inter-Segment Eliminations | WSFS Bank
Segment Reporting Information [Line Items]
Interest income	7,534	6,566
Interest expense	26,063	29,311
Net interest income	(18,529)	(22,745)
Noninterest income	8,222	7,273
Total revenue	(10,307)	(15,472)
Total expenses	612	642
Noninterest expenses	612	642
Inter-Segment Eliminations | Cash Connect
Segment Reporting Information [Line Items]
Interest income	421	440
Interest expense	3,897	3,129
Net interest income	(3,476)	(2,689)
Noninterest income	398	435
Total revenue	(3,078)	(2,254)
Total expenses	1,445	1,409
Noninterest expenses	1,445	1,409
Inter-Segment Eliminations | Wealth and Trust
Segment Reporting Information [Line Items]
Interest income	25,642	28,871
Interest expense	3,637	3,437
Net interest income	22,005	25,434
Noninterest income	214	207
Total revenue	22,219	25,641
Total expenses	6,777	5,864
Noninterest expenses	$ 6,777	$ 5,864