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Stock Incentive Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Apr. 06, 2013
Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awards issued 0 0    
Common stock shares available under incentive compensation plans 3,310,508      
Unrecognized compensation expense $ 8,097      
Stock options exercised 24,806 60,094    
Intrinsic value of outstanding and exercisable stock options $ 10,045      
Common shares available for purchase under warrants       651,042
Annapolis Bancorp, Inc. [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrant issued, exercise price $ 3.21      
Warrant issued 342,564      
Warrants converted to purchase common stock 380,390      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense related to restricted stock awards $ 1,136 $ 340    
Tax benefit related to restricted stock awards 398 119    
Total fair value of awards vested 4,424 $ 5,740    
Unrecognized compensation expense 8,097      
Amount subject to accelerated vesting under Incentive Compensation Plan $ 40      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options exercised 24,806 60,094    
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares available for purchase under warrants 1,302,083      
Service-Based Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of awards issued, years 3 years      
Unrecognized compensation expense $ 3,178      
Performance-Based Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of awards issued, years 3 years      
Unrecognized compensation expense $ 4,919      
Performance-Based Awards [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock percentage of number of units issued 175.00%      
Performance-Based Awards [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock percentage of number of units issued 0.00%      
Warrant Expires in 2019 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrant issued, exercise price $ 11.52      
Warrant Expires in 2019 [Member] | Annapolis Bancorp, Inc. [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrant issued, exercise price     $ 3.57  
Market Based Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock percentage of number of units issued 100.00%