Segment Information - Details of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Interest income	$ 456,369	$ 514,405	$ 521,092
Noninterest income	185,480	201,025	188,109
Total revenue	641,849	715,430	709,201
Interest expense	22,720	48,450	76,144
Noninterest expenses	378,516	368,844	413,127
(Recovery of) provision for credit losses	(117,087)	153,180	25,560
Total expenses	284,149	570,474	514,831
Income before taxes	357,700	144,956	194,370
Income tax provision	86,095	31,636	46,452
Net income	271,605	113,320	147,918
Less: Net income (loss) attributable to noncontrolling interest	163	(1,454)	(891)
Net income attributable to WSFS	271,442	114,774	148,809
Capital expenditures	6,576	7,159	14,198
Operating Segments
Segment Reporting Information [Line Items]
Interest income	456,369	514,405	521,092
Noninterest income	185,480	201,025	188,109
Total revenue	676,981	747,663	750,108
Interest expense	22,720	48,450	76,144
Noninterest expenses	378,516	368,844	413,127
Total expenses	319,281	602,707	555,738
Income before taxes	357,700	144,956	194,370
Capital expenditures	6,576	7,159	14,198
Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	16,550	16,528	29,461
Noninterest income	18,582	15,705	11,446
Total revenue	35,132	32,233	40,907
Interest expense	16,550	16,528	29,461
Noninterest expenses	18,582	15,705	11,446
Total expenses	35,132	32,233	40,907
WSFS Bank
Segment Reporting Information [Line Items]
Total revenue	526,852	615,843	603,390
(Recovery of) provision for credit losses	(113,715)	149,453	24,884
Total expenses	236,620	506,680	444,393
WSFS Bank | Operating Segments
Segment Reporting Information [Line Items]
Interest income	447,542	505,258	510,492
Noninterest income	79,310	110,585	92,898
Total revenue	546,300	633,811	625,424
Interest expense	22,058	46,428	71,158
Noninterest expenses	328,277	310,799	348,351
Total expenses	252,304	520,945	463,266
Income before taxes	293,996	112,866	162,158
Capital expenditures	6,344	6,499	11,806
WSFS Bank | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	3,460	4,930	12,380
Noninterest income	15,988	13,038	9,654
Total revenue	19,448	17,968	22,034
Interest expense	13,090	11,598	17,081
Noninterest expenses	2,594	2,667	1,792
Total expenses	15,684	14,265	18,873
Cash Connect
Segment Reporting Information [Line Items]
Total revenue	42,818	40,899	51,143
(Recovery of) provision for credit losses	0	0	0
Total expenses	29,465	28,421	35,377
Cash Connect | Operating Segments
Segment Reporting Information [Line Items]
Interest income	0	0	0
Noninterest income	42,818	40,899	51,143
Total revenue	45,146	42,585	52,033
Interest expense	0	0	0
Noninterest expenses	29,465	28,421	35,377
Total expenses	34,957	33,341	45,939
Income before taxes	10,189	9,244	6,094
Capital expenditures	232	420	2,120
Cash Connect | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	1,088	851	0
Noninterest income	1,240	835	890
Total revenue	2,328	1,686	890
Interest expense	856	1,580	78,080
Noninterest expenses	4,636	3,340	2,754
Total expenses	5,492	4,920	10,562
Wealth Management
Segment Reporting Information [Line Items]
Total revenue	72,179	58,688	54,668
(Recovery of) provision for credit losses	(3,372)	3,727	676
Total expenses	18,064	35,373	35,061
Wealth Management | Operating Segments
Segment Reporting Information [Line Items]
Interest income	8,827	9,147	10,600
Noninterest income	63,352	49,541	44,068
Total revenue	85,535	71,267	72,651
Interest expense	662	2,022	4,986
Noninterest expenses	20,774	29,624	29,399
Total expenses	32,020	48,421	46,533
Income before taxes	53,515	22,846	26,118
Capital expenditures	0	240	272
Wealth Management | Inter-Segment Eliminations
Segment Reporting Information [Line Items]
Interest income	12,002	10,747	17,081
Noninterest income	1,354	1,832	902
Total revenue	13,356	12,579	17,983
Interest expense	2,604	3,350	4,572
Noninterest expenses	11,352	9,698	6,900
Total expenses	$ 13,956	$ 13,048	$ 11,472