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Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, assumed in acquisition (shares) 0 491,248 0  
Weighted average exercise price, assumed in acquisition (in dollars per share) $ 0 $ 21.92 $ 0  
Compensation cost related to non-vested awards not yet recognized $ 10,400      
Aggregate intrinsic value for stock options outstanding 15,400      
Aggregate intrinsic value for stock options exercisable $ 14,100      
Equity Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan vesting rate (percent) 20.00%      
Award vesting period (years) 3 years      
Stock incentive plan expiration period (years) 10 years      
Expense for stock option grants $ 973 $ 1,000 $ 1,200  
Vesting period of compensation cost related to non-vested awards 3 years 4 months 6 days      
Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expense for stock option grants $ 2,900 $ 2,000 $ 1,000  
2011 Stock Incentive Plan | Equity Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan, number of additional shares authorized (shares) 4,000,000      
Stock incentive plan remaining options or awards (shares) 261,527      
2011 Stock Incentive Plan | Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan, number of additional shares authorized (shares) 1,600,000      
Stock incentive plan remaining options or awards (shares) 104,611      
2006 Stock Incentive Plan | Equity Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan, number of additional shares authorized (shares) 1,000,000      
Stock incentive plan remaining options or awards (shares) 0      
2006 Stock Incentive Plan | Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan, number of additional shares authorized (shares) 333,333      
Tranche One | Equity Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock incentive plan vesting rate (percent) 20.00%      
Cape Bancorp, Inc.        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, assumed in acquisition (shares)       599,373
Weighted average exercise price, assumed in acquisition (in dollars per share)       $ 10.34
Ocean Shore Holdings Co.        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, assumed in acquisition (shares)       287,595
Weighted average exercise price, assumed in acquisition (in dollars per share)       $ 9.37
Sun Bancorp, Inc.        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares, assumed in acquisition (shares)   491,248    
Weighted average exercise price, assumed in acquisition (in dollars per share)   $ 21.92