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Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
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 491,248 0 886,968
Weighted average exercise price, assumed in acquisition (in dollars per share) $ 21.92 $ 0.00 $ 10.30
Compensation cost related to non-vested awards not yet recognized $ 8,700    
Aggregate intrinsic value for stock options outstanding 13,700    
Aggregate intrinsic value for stock options exercisable $ 12,000    
Equity Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock incentive plan expiration period 10 years    
Stock incentive plan vesting rate 20.00%    
Award vesting period 3 years    
Expense for stock option grants $ 1,010 $ 1,200 $ 829
Vesting period of compensation cost related to non-vested awards 3 years 2 months 30 days    
Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expense for stock option grants $ 2,000 $ 1,000 $ 684
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 4,000,000    
Stock incentive plan remaining options or awards 1,137,286    
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 1,600,000    
Stock incentive plan remaining options or awards 454,914    
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 1,000,000    
Stock incentive plan remaining options or awards 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 333,333    
Tranche One | Equity Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock incentive plan vesting rate 20.00%    
Cape Bancorp, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, assumed in acquisition 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 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 491,248    
Weighted average exercise price, assumed in acquisition (in dollars per share) $ 21.92