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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Net income $ 6,148 $ 6,259 $ 6,175 $ 5,958 $ 5,715 $ 7,043 $ 7,007 $ 5,725 $ 24,540 $ 25,490 $ 23,312
Dividends on preferred stock       105 227 228 227 228 105 910 1,024
Net income available to common shareholders $ 6,148 $ 6,259 $ 6,175 $ 5,853 $ 5,488 $ 6,815 $ 6,780 $ 5,497 $ 24,435 $ 24,580 $ 22,288
Weighted average number of common shares outstanding, basic 18,193,824 18,470,348 18,831,742 18,633,574 18,403,959 18,402,764 18,395,996 18,423,123 18,531,039 18,406,363 19,792,099
Convertible preferred stock                 166,942 1,046,175 1,132,998
Contingently issuable shares                   11,448 12,352
Weighted average number of common shares outstanding, diluted 18,226,719 18,500,975 18,860,119 19,344,443 19,482,000 19,466,126 19,457,237 19,506,647 18,727,464 19,483,054 20,961,800
Basic earnings per common share $ 0.34 $ 0.34 $ 0.33 $ 0.31 $ 0.30 $ 0.37 $ 0.37 $ 0.30 $ 1.32 $ 1.34 $ 1.13
Diluted earnings per common share $ 0.34 $ 0.34 $ 0.33 $ 0.31 $ 0.29 $ 0.36 $ 0.36 $ 0.29 $ 1.31 $ 1.31 $ 1.11
Total potential antidilutive shares                 127,882 222,651 317,691
Stock Options                      
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Stock attributable to share based compensation                 26,487 18,607 19,337
Total potential antidilutive shares                 127,882 222,651 317,420
Restricted Stock                      
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Stock attributable to share based compensation                 2,996 461 5,014
Total potential antidilutive shares                     271