STOCKHOLDERS' EQUITY AND REGULATORY CAPITAL - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 01, 2022 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 shares	Dec. 31, 2005 USD ($)
Capital Unit [Line Items]
Ratio of common equity Tier 1 capital to risk-weighted assets percent		4.50%	4.50%
Ratio of Tier 1 capital to risk-weighted assets percent		0.1381	0.1317
Ratio of total capital to risk-weighted assets percent		0.1577	0.1523
Tier 1 leverage ratio percent		0.1096	0.1048
Common stock outstanding, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Coupon rate (as a percent)		6.53%
Cash that remains at the holding company		$ 275.4
Minimum annual net income expected (as percent)		35.00%
Additional Stock Buyback Program
Capital Unit [Line Items]
Common stock average repurchase price (in dollars per share) | $ / shares		$ 46.55
Treasury Stock
Capital Unit [Line Items]
Repurchases of common stock (in shares) | shares		2,049,739	1,247,178	4,151,117
Junior Subordinated Debt
Capital Unit [Line Items]
Interest rate on unsecured debt (as a percent)		6.77%
WSFS Capital Trust III
Capital Unit [Line Items]
Pooled floating rate securities, par value					$ 2.0
Pooled floating rate securities issued					$ 67.0
Trusts
Capital Unit [Line Items]
Trust common securities owned	$ 0.8
Trusts | Junior Subordinated Debt
Capital Unit [Line Items]
Trust capital securities issued	11.9
Trust capital securities issued net	$ 23.8
SOFR
Capital Unit [Line Items]
Variable interest rate (as a percent)		2.41%
SOFR | Junior Subordinated Debt
Capital Unit [Line Items]
Variable interest rate (as a percent)		2.41%
Trust Preferred Borrowings | LIBOR | WSFS Capital Trust III
Capital Unit [Line Items]
Variable interest rate (as a percent)					1.77%
Minimum
Capital Unit [Line Items]
Ratio of common equity Tier 1 capital to risk-weighted assets percent		4.50%
Ratio of Tier 1 capital to risk-weighted assets percent		0.0600
Ratio of total capital to risk-weighted assets percent		0.0800
Tier 1 leverage ratio percent		0.0400