Parent Company Financial Information - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 1,532,939	$ 1,654,735
Other assets	315,472	296,204
Total assets	15,777,327	14,333,914
Liabilities:
Trust preferred borrowings	67,011	67,011
Senior debt	147,939	246,617
Accrued interest payable	736	1,450
Other liabilities	360,036	345,679
Total liabilities	13,840,311	12,544,434
Stockholders’ equity:
Common stock	577	576
Capital in excess of par value	1,058,997	1,053,022
Accumulated other comprehensive (loss) income	(37,768)	56,007
Retained earnings	1,224,614	977,414
Treasury stock	(307,321)	(295,293)
Total stockholders’ equity of WSFS	1,939,099	1,791,726
Total liabilities and stockholders’ equity	15,777,327	14,333,914
WSFS Financial Corporation
Assets:
Cash and cash equivalents	103,708	244,925
Investment in subsidiaries	2,045,080	1,862,970
Investment in the Trust	2,011	2,011
Other assets	4,514	4,728
Total assets	2,155,313	2,114,634
Liabilities:
Trust preferred borrowings	67,011	67,011
Senior debt	147,939	246,617
Accrued interest payable	298	581
Other liabilities	966	8,699
Total liabilities	216,214	322,908
Stockholders’ equity:
Common stock	577	576
Capital in excess of par value	1,058,997	1,053,022
Accumulated other comprehensive (loss) income	(37,768)	56,007
Retained earnings	1,224,614	977,414
Treasury stock	(307,321)	(295,293)
Total stockholders’ equity of WSFS	1,939,099	1,791,726
Total liabilities and stockholders’ equity	$ 2,155,313	$ 2,114,634