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Stockholders' Equity and Regulatory Capital - Additional Information (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
shares
Dec. 31, 2005
USD ($)
Capital Unit [Line Items]        
Ratio of common equity Tier 1 capital to risk-weighted assets (as percent) 4.50% 4.50%    
Ratio of Tier 1 capital to risk-weighted assets (as percent) 0.1250 0.1329    
Ratio of total capital to risk-weighted assets (as percent) 0.1376 0.1378    
Tier 1 leverage ratio (as percent) 0.0976 0.1154    
Common stock outstanding, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01    
Coupon rate (as percent) 2.00%      
Cash remains at the holding company $ 244.9      
Repurchases of common stock (in shares) | shares   2,132,390 691,742  
Minimum annual net income expected (as percent) 25.00%      
Treasury Stock        
Capital Unit [Line Items]        
Repurchases of common stock (in shares) | shares 3,950,855      
Additional Stock Buyback Program        
Capital Unit [Line Items]        
Common stock average repurchase price (in dollars per share) | $ / shares $ 39.21      
Minimum        
Capital Unit [Line Items]        
Ratio of common equity Tier 1 capital to risk-weighted assets (as percent) 4.50%      
Ratio of Tier 1 capital to risk-weighted assets (as percent) 0.0600      
Ratio of total capital to risk-weighted assets (as percent) 0.0800      
Tier 1 leverage ratio (as percent) 0.0400      
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 (as percent)       1.77%
Trust preferred borrowings | LIBOR Rate | WSFS Capital Trust III        
Capital Unit [Line Items]        
Variable interest rate (as percent)       1.77%