Parent Company Financial Information - Condensed Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents	$ 571,752	$ 620,757
Other assets	262,353	65,020
Total assets	12,256,302	7,248,870
Liabilities:
Trust preferred borrowings	67,011	67,011
Senior debt	98,605	98,388
Accrued interest payable	3,103	1,900
Other liabilities	327,563	85,831
Total liabilities	10,406,811	6,427,950
Stockholders’ Equity:
Common stock	575	569
Capital in excess of par value	1,049,064	349,810
Accumulated other comprehensive income (loss)	23,501	(15,394)
Retained earnings	917,377	791,031
Treasury stock	(140,211)	(305,096)
Total stockholders’ equity of WSFS	1,850,306	820,920
Total liabilities and stockholders’ equity	12,256,302	7,248,870
WSFS Financial Corporation
Assets:
Cash and cash equivalents	71,430	30,581
Investment in subsidiaries	1,943,866	923,381
Investment in the Trust	2,011	2,011
Other assets	4,041	31,050
Total assets	2,021,348	987,023
Liabilities:
Trust preferred borrowings	67,011	67,011
Senior debt	98,605	98,388
Accrued interest payable	405	443
Other liabilities	5,021	261
Total liabilities	171,042	166,103
Stockholders’ Equity:
Common stock	575	569
Capital in excess of par value	1,049,064	349,810
Accumulated other comprehensive income (loss)	23,501	(15,394)
Retained earnings	917,377	791,031
Treasury stock	(140,211)	(305,096)
Total stockholders’ equity of WSFS	1,850,306	820,920
Total liabilities and stockholders’ equity	$ 2,021,348	$ 987,023