SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Interest income	$ 133,855	$ 99,577
Noninterest income	40,847	41,122
Total revenue	174,702	140,699
Interest expense	17,705	16,263
Noninterest expenses	88,496	97,592
Provision for credit losses	56,646	7,654
Total expenses	162,847	121,509
Income before taxes	11,855	19,190
Income tax provision	1,288	6,260
Net income	10,567	12,930
Less: Net loss attributable to noncontrolling interest	(360)	(93)
Net Income (Loss) Attributable to Parent, Total	10,927	13,023
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	4,792	7,797
Noninterest income	3,309	2,246
Total revenue	8,101	10,043
Interest expense	4,792	7,797
Noninterest expenses	3,309	2,246
Total expenses	8,101	10,043
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	182,803	150,742
Total expenses	170,948	131,552
Income before taxes	11,855	19,190
WSFS Bank
Segment Reporting Information [Line Items]
Interest income	131,309	96,946
Noninterest income	18,072	17,264
Total revenue	149,381	114,210
Interest expense	16,747	15,136
Noninterest expenses	73,085	82,577
Provision for credit losses	55,034	7,286
Total expenses	144,866	104,999
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	1,943	3,792
Noninterest income	2,907	1,883
Total revenue	4,850	5,675
Interest expense	2,849	4,005
Noninterest expenses	402	363
Total expenses	3,251	4,368
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	154,231	119,885
Total expenses	148,117	109,367
Income before taxes	6,114	10,518
Cash Connect
Segment Reporting Information [Line Items]
Interest income	0	0
Noninterest income	11,679	12,402
Total revenue	11,679	12,402
Interest expense	0	0
Noninterest expenses	8,223	8,030
Provision for credit losses	0	0
Total expenses	8,223	8,030
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	0	0
Noninterest income	229	177
Total revenue	229	177
Interest expense	954	2,558
Noninterest expenses	741	545
Total expenses	1,695	3,103
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	11,908	12,579
Total expenses	9,918	11,133
Income before taxes	1,990	1,446
Wealth Management
Segment Reporting Information [Line Items]
Interest income	2,546	2,631
Noninterest income	11,096	11,456
Total revenue	13,642	14,087
Interest expense	958	1,127
Noninterest expenses	7,188	6,985
Provision for credit losses	1,612	368
Total expenses	9,758	8,480
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	2,849	4,005
Noninterest income	173	186
Total revenue	3,022	4,191
Interest expense	989	1,234
Noninterest expenses	2,166	1,338
Total expenses	3,155	2,572
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	16,664	18,278
Total expenses	12,913	11,052
Income before taxes	$ 3,751	$ 7,226