SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Interest income	$ 144,137	$ 121,281
Noninterest income	60,574	47,822
Total revenue	204,711	169,103
Interest expense	5,579	7,096
Noninterest expenses	174,457	95,619
Provision for (recovery of) credit losses	18,971	(20,160)
Total expenses	199,007	82,555
(Loss) income before taxes	5,704	86,548
Income tax provision	1,737	21,407
Consolidated net income	3,967	65,141
Net income (loss) attributable to noncontrolling interest	163	59
Net income attributable to WSFS	3,804	65,082
Capital expenditures for the period ended	1,647	1,270
Operating Segments
Segment Reporting Information [Line Items]
Interest income	144,137	121,281
Noninterest income	60,574	47,822
Total revenue	218,469	177,293
Interest expense	5,579	7,096
Noninterest expenses	174,457	95,619
Total expenses	212,765	90,745
(Loss) income before taxes	5,704	86,548
Capital expenditures for the period ended	1,647	1,270
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	6,717	3,808
Noninterest income	7,041	4,382
Total revenue	13,758	8,190
Interest expense	6,717	3,808
Noninterest expenses	7,041	4,382
Total expenses	13,758	8,190
WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	160,227	142,479
Provision for (recovery of) credit losses	19,209	(19,593)
Total expenses	173,113	67,855
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	141,402	119,131
Noninterest income	18,825	23,348
Total revenue	167,769	147,018
Interest expense	5,403	6,904
Noninterest expenses	148,501	80,544
Total expenses	179,329	71,506
(Loss) income before taxes	(11,560)	75,512
Capital expenditures for the period ended	1,647	1,270
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	1,052	844
Noninterest income	6,490	3,695
Total revenue	7,542	4,539
Interest expense	5,665	2,964
Noninterest expenses	551	687
Total expenses	6,216	3,651
Cash Connect
Segment Reporting Information [Line Items]
Total revenue	10,070	9,702
Provision for (recovery of) credit losses	0	0
Total expenses	7,549	7,298
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0
Noninterest income	10,070	9,702
Total revenue	10,761	10,257
Interest expense	0	0
Noninterest expenses	7,549	7,298
Total expenses	8,969	8,565
(Loss) income before taxes	1,792	1,692
Capital expenditures for the period ended	0	0
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	326	269
Noninterest income	365	286
Total revenue	691	555
Interest expense	275	180
Noninterest expenses	1,145	1,087
Total expenses	1,420	1,267
Wealth Management
Segment Reporting Information [Line Items]
Total revenue	34,414	16,922
Provision for (recovery of) credit losses	(238)	(567)
Total expenses	18,345	7,402
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	2,735	2,150
Noninterest income	31,679	14,772
Total revenue	39,939	20,018
Interest expense	176	192
Noninterest expenses	18,407	7,777
Total expenses	24,467	10,674
(Loss) income before taxes	15,472	9,344
Capital expenditures for the period ended	0	0
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	5,339	2,695
Noninterest income	186	401
Total revenue	5,525	3,096
Interest expense	777	664
Noninterest expenses	5,345	2,608
Total expenses	$ 6,122	$ 3,272