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Calculation for Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Net income         $ 6,148 $ 6,259 $ 6,175 $ 5,958 $ 25,126 $ 24,540 $ 25,490
Dividends on preferred stock               105   105 910
Net income available to common shareholders $ 6,404 $ 6,383 $ 6,255 $ 6,084 $ 6,148 $ 6,259 $ 6,175 $ 5,853 $ 25,126 $ 24,435 $ 24,580
Weighted average common shares outstanding, basic 16,981,010 17,031,074 17,414,320 17,859,197 18,193,824 18,470,348 18,831,742 18,633,574 17,319,689 18,531,039 18,406,363
Convertible preferred stock                   166,942 1,046,175
Contingently issuable shares                     11,448
Total dilutive effect of potential common shares                 45,835 196,425 1,076,691
Weighted average common shares outstanding, diluted 17,043,869 17,083,526 17,462,845 17,892,531 18,226,719 18,500,975 18,860,119 19,344,443 17,365,524 18,727,464 19,483,054
Basic earnings per common share $ 0.38 $ 0.37 $ 0.36 $ 0.34 $ 0.34 $ 0.34 $ 0.33 $ 0.31 $ 1.45 $ 1.32 $ 1.34
Diluted earnings per common share $ 0.38 $ 0.37 $ 0.36 $ 0.34 $ 0.34 $ 0.34 $ 0.33 $ 0.31 $ 1.45 $ 1.31 $ 1.31
Total potential antidilutive shares                 110,871 127,882 222,651
Stock Options                      
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Stock attributable to share based compensation                 34,530 26,487 18,607
Total potential antidilutive shares                 107,592 127,882 222,651
Restricted Stock                      
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Stock attributable to share based compensation                 11,305 2,996 461
Total potential antidilutive shares                 3,279