Stockholders' Equity and Regulatory Capital - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 shares	Dec. 31, 2005 USD ($)
Capital Unit [Line Items]
Ratio of common equity Tier 1 capital to risk-weighted assets percentage	4.50%	4.50%
Ratio of Tier 1 capital to risk-weighted assets percentage	0.1479	0.1250
Ratio of total capital to risk-weighted assets percentage	0.1559	0.1376
Tier 1 leverage ratio percentage	0.1024	0.0976
Common stock outstanding, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Coupon rate percentage	1.94%
Cash remains at the holding company	$ 103.7
Repurchases of common stock (in shares) | shares			2,132,390
Minimum annual net income expected (as percent)	25.00%
Treasury Stock
Capital Unit [Line Items]
Repurchases of common stock (in shares) | shares	267,309	3,950,855
Additional Stock Buyback Program
Capital Unit [Line Items]
Common stock average repurchase price (in dollars per share) | $ / shares	$ 44.97
WSFS Capital Trust III
Capital Unit [Line Items]
Pooled floating rate securities, par value				$ 2.0
Pooled floating rate securities issued				$ 67.0
LIBOR Rate | WSFS Capital Trust III
Capital Unit [Line Items]
Variable interest rate percentage				1.77%
Trust preferred borrowings | LIBOR Rate | WSFS Capital Trust III
Capital Unit [Line Items]
Variable interest rate percentage				1.77%
Minimum
Capital Unit [Line Items]
Ratio of common equity Tier 1 capital to risk-weighted assets percentage	4.50%
Ratio of Tier 1 capital to risk-weighted assets percentage	0.0600
Ratio of total capital to risk-weighted assets percentage	0.0800
Tier 1 leverage ratio percentage	0.0400