Parent Company Financial Information - Condensed Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Cash and cash equivalents	$ 1,654,735	$ 571,752
Other assets	296,204	262,353
Total assets	14,333,914	12,256,302
Liabilities:
Trust preferred borrowings	67,011	67,011
Senior debt	246,617	98,605
Accrued interest payable	1,450	3,103
Other liabilities	345,679	327,563
Total liabilities	12,544,434	10,406,811
Stockholders’ Equity:
Common stock	576	575
Capital in excess of par value	1,053,022	1,049,064
Accumulated other comprehensive income	56,007	23,501
Retained earnings	977,414	917,377
Treasury stock	(295,293)	(140,211)
Total stockholders’ equity of WSFS	1,791,726	1,850,306
Total liabilities and stockholders’ equity	14,333,914	12,256,302
WSFS Financial Corporation
Assets:
Cash and cash equivalents	244,925	71,430
Investment in subsidiaries	1,862,970	1,943,866
Investment in the Trust	2,011	2,011
Other assets	4,728	4,041
Total assets	2,114,634	2,021,348
Liabilities:
Trust preferred borrowings	67,011	67,011
Senior debt	246,617	98,605
Accrued interest payable	581	405
Other liabilities	8,699	5,021
Total liabilities	322,908	171,042
Stockholders’ Equity:
Common stock	576	575
Capital in excess of par value	1,053,022	1,049,064
Accumulated other comprehensive income	56,007	23,501
Retained earnings	977,414	917,377
Treasury stock	(295,293)	(140,211)
Total stockholders’ equity of WSFS	1,791,726	1,850,306
Total liabilities and stockholders’ equity	$ 2,114,634	$ 2,021,348