SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Interest income	$ 160,020	$ 112,902	$ 304,157	$ 234,183
Noninterest income	72,029	49,018	132,603	96,840
Total revenue	232,049	161,920	436,760	331,023
Interest expense	6,405	6,153	11,984	13,249
Noninterest expenses	134,049	96,032	308,506	191,651
Provision for (recovery of) credit losses	8,268	(67,563)	27,239	(87,723)
Total expenses	148,722	34,622	347,729	117,177
Income before taxes	83,327	127,298	89,031	213,846
Income tax provision	22,425	31,687	24,162	53,094
Consolidated net income	60,902	95,611	64,869	160,752
Net income attributable to noncontrolling interest	162	(56)	325	3
Net income attributable to WSFS	60,740	95,667	64,544	160,749
Capital expenditures for the period ended			4,436	3,005
Operating Segments
Segment Reporting Information [Line Items]
Interest income	160,020	112,902	304,157	234,183
Noninterest income	72,029	49,018	132,603	96,840
Total revenue	250,713	170,742	469,182	348,035
Interest expense	6,405	6,153	11,984	13,249
Noninterest expenses	134,049	96,032	308,506	191,651
Total expenses	167,386	43,444	380,151	134,189
Income before taxes	83,327	127,298	89,031	213,846
Capital expenditures for the period ended	2,789	1,735	4,436	3,005
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	11,372	4,201	18,089	8,009
Noninterest income	7,292	4,621	14,333	9,003
Total revenue	18,664	8,822	32,422	17,012
Interest expense	11,372	4,201	18,089	8,009
Noninterest expenses	7,292	4,621	14,333	9,003
Total expenses	18,664	8,822	32,422	17,012
WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	184,597	133,007	344,824	275,486
Provision for (recovery of) credit losses	7,975	(66,385)	27,184	(85,978)
Total expenses	122,755	20,078	295,868	87,933
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	157,174	110,725	298,576	229,856
Noninterest income	27,423	22,282	46,248	45,630
Total revenue	193,402	137,639	361,171	284,657
Interest expense	6,149	5,983	11,552	12,887
Noninterest expenses	108,631	80,480	257,132	161,024
Total expenses	132,614	24,268	311,943	95,774
Income before taxes	60,788	113,371	49,228	188,883
Capital expenditures for the period ended	2,789	1,735	4,436	3,005
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	2,098	842	3,150	1,686
Noninterest income	6,707	3,790	13,197	7,485
Total revenue	8,805	4,632	16,347	9,171
Interest expense	9,274	3,359	14,939	6,323
Noninterest expenses	585	831	1,136	1,518
Total expenses	9,859	4,190	16,075	7,841
Cash Connect
Segment Reporting Information [Line Items]
Total revenue	12,014	11,213	22,084	20,915
Provision for (recovery of) credit losses	0	0	0	0
Total expenses	8,188	7,288	15,737	14,586
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Noninterest income	12,014	11,213	22,084	20,915
Total revenue	12,844	11,857	23,605	22,114
Interest expense	0	0	0	0
Noninterest expenses	8,188	7,288	15,737	14,586
Total expenses	10,501	8,599	19,470	17,164
Income before taxes	2,343	3,258	4,135	4,950
Capital expenditures for the period ended	0	0	0	0
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	406	328	732	597
Noninterest income	424	316	789	602
Total revenue	830	644	1,521	1,199
Interest expense	1,207	207	1,482	387
Noninterest expenses	1,106	1,104	2,251	2,191
Total expenses	2,313	1,311	3,733	2,578
Wealth Management
Segment Reporting Information [Line Items]
Total revenue	35,438	17,700	69,852	34,622
Provision for (recovery of) credit losses	293	(1,178)	55	(1,745)
Total expenses	17,779	7,256	36,124	14,658
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	2,846	2,177	5,581	4,327
Noninterest income	32,592	15,523	64,271	30,295
Total revenue	44,467	21,246	84,406	41,264
Interest expense	256	170	432	362
Noninterest expenses	17,230	8,264	35,637	16,041
Total expenses	24,271	10,577	48,738	21,251
Income before taxes	20,196	10,669	35,668	20,013
Capital expenditures for the period ended	0	0	0	0
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	8,868	3,031	14,207	5,726
Noninterest income	161	515	347	916
Total revenue	9,029	3,546	14,554	6,642
Interest expense	891	635	1,668	1,299
Noninterest expenses	5,601	2,686	10,946	5,294
Total expenses	$ 6,492	$ 3,321	$ 12,614	$ 6,593