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Calculation for Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Net income $ 6,383 $ 6,259 $ 18,722 $ 18,392
Dividends on preferred stock       105
Net income available to common shareholders $ 6,383 $ 6,259 $ 18,722 $ 18,287
Weighted average common shares outstanding, basic 17,031,074 18,470,348 17,433,406 18,644,679
Convertible preferred stock       223,201
Total dilutive effect of potential common shares 52,452 30,627 41,805 251,230
Weighted average common shares outstanding, diluted 17,083,526 18,500,975 17,475,211 18,895,909
Basic earnings per common share $ 0.37 $ 0.34 $ 1.07 $ 0.98
Diluted earnings per common share $ 0.37 $ 0.34 $ 1.07 $ 0.97
Total potential antidilutive shares 127,789 130,382 127,789 130,382
Stock Options        
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Stock attributable to share based compensation 38,746 26,804 31,856 24,938
Total potential antidilutive shares 127,789 130,382 127,789 130,382
Restricted Stock        
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Stock attributable to share based compensation 13,706 3,823 9,949 3,091