SEGMENT INFORMATION - Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Interest income	$ 241,769	$ 160,020	$ 468,152	$ 304,157
Noninterest income	66,871	72,029	129,998	132,603
Revenues, Total	348,486	250,713	672,683	469,182
Interest expense	59,927	6,405	103,778	11,984
Noninterest expenses	141,253	134,049	274,298	308,506
Provision for (recovery of) credit losses	15,830	8,268	44,841	27,239
Total expenses	256,856	167,386	497,450	380,151
Income before taxes	91,630	83,327	175,233	89,031
Income tax provision	23,035	22,425	43,976	24,162
Consolidated net income	68,595	60,902	131,257	64,869
Net (loss) income attributable to noncontrolling interest	(83)	162	175	325
Net income attributable to WSFS	68,678	60,740	131,082	64,544
Capital expenditures for the period ended			1,812	4,436
Operating Segments
Segment Reporting Information [Line Items]
Interest income	241,769	160,020	468,152	304,157
Noninterest income	66,871	72,029	129,998	132,603
Revenues, Total	308,640	232,049	598,150	436,760
Interest expense	59,927	6,405	103,778	11,984
Noninterest expenses	141,253	134,049	274,298	308,506
Provision for (recovery of) credit losses	15,830	8,268	44,841	27,239
Total expenses	217,010	148,722	422,917	347,729
Capital expenditures for the period ended	956	2,789	1,812	4,436
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	31,996	11,372	59,217	18,089
Noninterest income	7,850	7,292	15,316	14,333
Revenues, Total	39,846	18,664	74,533	32,422
Interest expense	31,996	11,372	59,217	18,089
Noninterest expenses	7,850	7,292	15,316	14,333
Total expenses	39,846	18,664	74,533	32,422
WSFS Bank
Segment Reporting Information [Line Items]
Revenues, Total	264,480	193,402	512,914	361,171
Total expenses	204,297	132,614	393,138	311,943
Income before taxes	60,183	60,788	119,776	49,228
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	236,405	157,174	457,690	298,576
Noninterest income	14,089	27,423	28,239	46,248
Revenues, Total	250,494	184,597	485,929	344,824
Interest expense	53,962	6,149	92,449	11,552
Noninterest expenses	108,147	108,631	209,096	257,132
Provision for (recovery of) credit losses	16,328	7,975	44,045	27,184
Total expenses	178,437	122,755	345,590	295,868
Capital expenditures for the period ended	956	2,789	1,812	4,436
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	6,725	2,098	12,824	3,150
Noninterest income	7,261	6,707	14,161	13,197
Revenues, Total	13,986	8,805	26,985	16,347
Interest expense	25,271	9,274	46,393	14,939
Noninterest expenses	589	585	1,155	1,136
Total expenses	25,860	9,859	47,548	16,075
Cash Connect
Segment Reporting Information [Line Items]
Revenues, Total	20,810	12,844	39,845	23,605
Total expenses	19,873	10,501	38,278	19,470
Income before taxes	937	2,343	1,567	4,135
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Noninterest income	19,992	12,014	38,171	22,084
Revenues, Total	19,992	12,014	38,171	22,084
Interest expense	0	0	0	0
Noninterest expenses	14,538	8,188	28,038	15,737
Provision for (recovery of) credit losses	0	0	0	0
Total expenses	14,538	8,188	28,038	15,737
Capital expenditures for the period ended	0	0	0	0
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	323	406	718	732
Noninterest income	495	424	956	789
Revenues, Total	818	830	1,674	1,521
Interest expense	3,851	1,207	7,410	1,482
Noninterest expenses	1,484	1,106	2,830	2,251
Total expenses	5,335	2,313	10,240	3,733
Wealth Management
Segment Reporting Information [Line Items]
Revenues, Total	63,196	44,467	119,924	84,406
Total expenses	32,686	24,271	66,034	48,738
Income before taxes	30,510	20,196	53,890	35,668
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	5,364	2,846	10,462	5,581
Noninterest income	32,790	32,592	63,588	64,271
Revenues, Total	38,154	35,438	74,050	69,852
Interest expense	5,965	256	11,329	432
Noninterest expenses	18,568	17,230	37,164	35,637
Provision for (recovery of) credit losses	(498)	293	796	55
Total expenses	24,035	17,779	49,289	36,124
Capital expenditures for the period ended	0	0	0	0
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	24,948	8,868	45,675	14,207
Noninterest income	94	161	199	347
Revenues, Total	25,042	9,029	45,874	14,554
Interest expense	2,874	891	5,414	1,668
Noninterest expenses	5,777	5,601	11,331	10,946
Total expenses	$ 8,651	$ 6,492	$ 16,745	$ 12,614