Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income:
Interest and fees on loans and leases	$ 460,394	$ 463,220	$ 260,506
Interest on mortgage-backed securities	48,377	48,954	26,065
Interest and dividends on investment securities:
Taxable	1,191	131	61
Tax-exempt	3,428	3,884	4,317
Other interest income	1,015	4,903	2,024
Total interest income	514,405	521,092	292,973
Interest expense:
Interest on deposits	39,262	60,075	29,068
Interest on Federal Home Loan Bank advances	1,950	5,520	8,395
Interest on senior debt	4,998	4,717	4,717
Interest on trust preferred borrowings	1,751	2,772	2,573
Interest on federal funds purchased	471	2,971	1,695
Interest on other borrowings	18	89	51
Total interest expense	48,450	76,144	46,499
Net interest income	465,955	444,948	246,474
Provision for credit losses	153,180	25,560	13,170
Net interest income after provision for credit losses	312,775	419,388	233,304
Noninterest income:
Loan and lease fee income	4,518	3,577	2,492
Security gains, net	9,076	333	21
Unrealized gains on equity investments, net	761	26,175	20,745
Realized gain on sale of equity investment, net	22,052	0	3,757
Bank owned life insurance income	1,280	1,247	175
Total non interest income	201,025	188,109	162,541
Noninterest expense:
Salaries, benefits and other compensation	194,317	182,564	122,983
Occupancy expense	32,105	33,068	19,783
Equipment expense	23,793	20,879	12,609
Professional fees	18,757	11,167	8,733
Data processing and operations expenses	12,600	13,373	7,757
Marketing expense	5,677	6,714	4,586
FDIC expenses	2,148	1,483	2,117
Loan workout and other credit costs	6,899	3,616	1,470
Corporate development expense	4,328	55,697	6,456
Restructuring expense	510	16,133	0
Recovery of legal settlement	0	0	(7,938)
Recovery of fraud loss	0	(463)	(1,675)
Loss on early extinguishment of debt	2,280	0	0
Other operating expense	65,430	68,896	48,166
Total non interest expenses	368,844	413,127	225,047
Income before taxes	144,956	194,370	170,798
Income tax provision	31,636	46,452	36,055
Net income	113,320	147,918	134,743
Less: Net loss attributable to noncontrolling interest	(1,454)	(891)	0
Net income attributable to WSFS	$ 114,774	$ 148,809	$ 134,743
Basic (in dollars per share)	$ 2.27	$ 3.02	$ 4.27
Diluted (in dollars per share)	$ 2.27	$ 3.00	$ 4.19
Credit/debit card and ATM income
Noninterest income:
Noninterest income	$ 35,014	$ 50,383	$ 43,837
Investment management and fiduciary revenue
Noninterest income:
Noninterest income	48,979	42,450	39,602
Deposit service charges
Noninterest income:
Noninterest income	19,999	22,972	18,771
Mortgage banking activities, net
Noninterest income:
Noninterest income	30,201	11,053	6,286
Other income
Noninterest income:
Noninterest income	$ 29,145	$ 29,919	$ 26,855