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Calculation for Basic and Diluted Earnings per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Net income $ 7,043 $ 5,412 $ 19,775 $ 17,988
Dividends on preferred stock 228 261 683 772
Net income available to common shareholders $ 6,815 $ 5,151 $ 19,092 $ 17,216
Weighted average number of common shares outstanding, basic 18,402,764 20,008,861 18,407,173 20,013,095
Convertible preferred stock 1,045,419 1,091,462 1,046,430 1,158,715
Weighted average number of common shares outstanding, diluted 19,466,126 21,123,788 19,472,136 21,196,063
Basic earnings per common share $ 0.37 $ 0.26 $ 1.04 $ 0.86
Diluted earnings per common share $ 0.36 $ 0.26 $ 1.02 $ 0.85
Total potential antidilutive shares 255,244 310,634 255,244 328,284
Stock Option
        
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Stock attributable to share based compensation 17,375 19,877 18,027 17,640
Total potential antidilutive shares 255,244 310,558 255,244 328,258
Restricted Stock
        
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Stock attributable to share based compensation 568 3,588 506 6,613
Total potential antidilutive shares   76   26