SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Interest income	$ 226,383	$ 144,137
Noninterest income	63,127	60,574
Revenues, Total	289,510	204,711
Interest expense	43,851	5,579
Noninterest expenses	133,045	174,457
Provision for (recovery of) credit losses	29,011	18,971
Total expenses	205,907	199,007
Income before taxes	83,603	5,704
Income tax provision	20,941	1,737
Consolidated net income	62,662	3,967
Net income attributable to noncontrolling interest	258	163
Net income attributable to WSFS	62,404	3,804
Capital expenditures for the period ended	856	1,647
Operating Segments
Segment Reporting Information [Line Items]
Interest income	226,383	144,137
Noninterest income	63,127	60,574
Revenues, Total	324,197	218,469
Interest expense	43,851	5,579
Noninterest expenses	133,045	174,457
Total expenses	240,594	212,765
Income before taxes	83,603	5,704
Capital expenditures for the period ended	856	1,647
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	27,221	6,717
Noninterest income	7,466	7,041
Revenues, Total	34,687	13,758
Interest expense	27,221	6,717
Noninterest expenses	7,466	7,041
Total expenses	34,687	13,758
WSFS Bank
Segment Reporting Information [Line Items]
Revenues, Total	235,435	160,227
Provision for (recovery of) credit losses	27,717	19,209
Total expenses	167,153	173,113
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	221,285	141,402
Noninterest income	14,150	18,825
Revenues, Total	248,434	167,769
Interest expense	38,487	5,403
Noninterest expenses	100,949	148,501
Total expenses	188,841	179,329
Income before taxes	59,593	(11,560)
Capital expenditures for the period ended	856	1,647
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	6,099	1,052
Noninterest income	6,900	6,490
Revenues, Total	12,999	7,542
Interest expense	21,122	5,665
Noninterest expenses	566	551
Total expenses	21,688	6,216
Cash Connect
Segment Reporting Information [Line Items]
Revenues, Total	18,179	10,070
Provision for (recovery of) credit losses	0	0
Total expenses	13,500	7,549
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0
Noninterest income	18,179	10,070
Revenues, Total	19,035	10,761
Interest expense	0	0
Noninterest expenses	13,500	7,549
Total expenses	18,405	8,969
Income before taxes	630	1,792
Capital expenditures for the period ended	0	0
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	395	326
Noninterest income	461	365
Revenues, Total	856	691
Interest expense	3,559	275
Noninterest expenses	1,346	1,145
Total expenses	4,905	1,420
Wealth Management
Segment Reporting Information [Line Items]
Revenues, Total	35,896	34,414
Provision for (recovery of) credit losses	1,294	(238)
Total expenses	25,254	18,345
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	5,098	2,735
Noninterest income	30,798	31,679
Revenues, Total	56,728	39,939
Interest expense	5,364	176
Noninterest expenses	18,596	18,407
Total expenses	33,348	24,467
Income before taxes	23,380	15,472
Capital expenditures for the period ended	0	0
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	20,727	5,339
Noninterest income	105	186
Revenues, Total	20,832	5,525
Interest expense	2,540	777
Noninterest expenses	5,554	5,345
Total expenses	$ 8,094	$ 6,122