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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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Net income $ 5,324 $ 5,412 $ 5,435 $ 7,141 $ 8,439 $ 10,059 $ 4,078 $ 6,001 $ 23,312 $ 28,577 $ 20,028
Dividends on preferred stock 252 261 253 258 272 220 283 283 1,024 1,058 703
Net income available to common shareholders $ 5,072 $ 5,151 $ 5,182 $ 6,883 $ 8,167 $ 9,839 $ 3,795 $ 5,718 $ 22,288 $ 27,519 $ 19,325
Weighted average number of common shares outstanding, basic 19,136,317 20,008,861 19,997,991 20,032,694 20,063,873 20,013,264 18,561,714 17,849,376 19,792,099 19,127,065 17,877,421
Convertible preferred stock                 1,132,998 1,285,848 808,367
Contingently issuable shares                 12,352    
Weighted average number of common shares outstanding, diluted 20,233,737 21,123,788 21,205,078 21,258,490 21,314,023 21,329,612 19,872,106 19,158,179 20,961,800 20,419,569 18,687,521
Basic earnings per common share $ 0.27 $ 0.26 $ 0.26 $ 0.34 $ 0.41 $ 0.49 $ 0.20 $ 0.32 $ 1.13 $ 1.44 $ 1.08
Diluted earnings per common share $ 0.26 $ 0.26 $ 0.26 $ 0.34 $ 0.40 $ 0.47 $ 0.21 $ 0.31 $ 1.11 $ 1.40 $ 1.07
Total potential antidilutive shares                 317,691 420,802 395,476
Stock Option
                      
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Stock attributable to share based compensation                 19,337 4,549 1,390
Total potential antidilutive shares                 317,420 420,802 393,133
Restricted Stock
                      
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Stock attributable to share based compensation                 5,014 2,107 343
Total potential antidilutive shares                 271   2,343