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Calculation for Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]    
Net income $ 6,084 $ 5,958
Dividends on preferred stock   105
Net income available to common shareholders $ 6,084 $ 5,853
Weighted average common shares outstanding, basic 17,859,197 18,633,574
Convertible preferred stock   677,043
Contingently issuable shares   11,411
Total dilutive effect of potential common shares 33,334 710,869
Weighted average common shares outstanding, diluted 17,892,531 19,344,443
Basic earnings per common share $ 0.34 $ 0.31
Diluted earnings per common share $ 0.34 $ 0.31
Total potential antidilutive shares 148,344 136,382
Stock Options    
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]    
Stock attributable to share based compensation 27,159 21,159
Total potential antidilutive shares 119,727 136,382
Restricted Stock    
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]    
Stock attributable to share based compensation 6,175 1,256
Total potential antidilutive shares 28,617