Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest Income:
Interest and fees on loans and leases	$ 463,220	$ 260,506	$ 229,147
Interest on mortgage-backed securities	48,954	26,065	19,308
Interest and dividends on investment securities
Taxable	131	61	137
Tax-exempt	3,884	4,317	4,511
Other interest income	4,903	2,024	1,623
Total interest income	521,092	292,973	254,726
Interest Expense:
Interest on deposits	60,075	29,068	14,904
Interest on Federal Home Loan Bank advances	5,520	8,395	8,263
Interest on senior debt	4,717	4,717	7,228
Interest on trust preferred borrowings	2,772	2,573	1,940
Interest on federal funds purchased	2,971	1,695	972
Interest on other borrowings	89	51	148
Total interest expense	76,144	46,499	33,455
Net interest income	444,948	246,474	221,271
Provision for loan and lease losses	25,560	13,170	10,964
Net interest income after provision for loan and lease losses	419,388	233,304	210,307
Noninterest Income:
Loan and lease fee income	3,577	2,492	2,218
Security gains, net	333	21	1,984
Unrealized gains on equity investments	26,175	20,745	0
Realized gain on sale of equity investment	0	3,757	0
Bank owned life insurance income	1,247	175	1,545
Total non interest income	188,109	162,541	124,644
Noninterest Expense:
Salaries, benefits and other compensation	182,564	122,983	114,376
Occupancy expense	33,068	19,783	19,409
Equipment expense	20,879	12,609	12,564
Professional fees	11,167	8,733	8,597
Data processing and operations expenses	13,373	7,757	6,779
Marketing expense	6,714	4,586	3,083
FDIC expenses	1,483	2,117	2,216
Loan workout and OREO expenses	2,720	1,548	1,820
Corporate development expense	55,697	6,456	878
Restructuring expense	16,133	0	0
(Recovery of) provision for legal settlement	0	(7,938)	12,000
(Recovery of) provision for fraud loss	(463)	(1,675)	2,844
Early extinguishment of debt costs	0	0	695
Other operating expense	69,792	48,088	41,200
Total non interest expenses	413,127	225,047	226,461
Income before taxes	194,370	170,798	108,490
Income tax provision	46,452	36,055	58,246
Net income	147,918	134,743	50,244
Less: Net loss attributable to noncontrolling interest	(891)	0	0
Net income attributable to WSFS	$ 148,809	$ 134,743	$ 50,244
Basic (in dollars per share)	$ 3.02	$ 4.27	$ 1.60
Diluted (in dollars per share)	$ 3.00	$ 4.19	$ 1.56
Credit/debit card and ATM income
Noninterest Income:
Noninterest income	$ 50,383	$ 43,837	$ 36,116
Investment management and fiduciary income
Noninterest Income:
Noninterest income	42,450	39,602	35,103
Deposit service charges
Noninterest Income:
Noninterest income	22,972	18,771	18,318
Mortgage banking activities, net
Noninterest Income:
Noninterest income	11,053	6,286	6,293
Other income
Noninterest Income:
Noninterest income	$ 29,919	$ 26,855	$ 23,067