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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]                      
Net income $ 8,439 $ 10,059 $ 4,078 $ 6,001 $ 3,231 $ 5,318 $ 5,728 $ 5,751 $ 28,577 $ 20,028 $ 21,847
Dividends on preferred stock 272 220 283 283 286 286 131   1,058 703  
Net income available to common shareholders $ 8,167 $ 9,839 $ 3,795 $ 5,718 $ 2,945 $ 5,032 $ 5,597 $ 5,751 $ 27,519 $ 19,325 $ 21,847
Weighted average common shares outstanding, basic 20,064 20,013 18,562 17,849 17,849 17,897 17,896 17,868 19,127,065 17,877,421 17,802,009
Diluted shares for stock options                 68,485 5,293 12,463
Contingently issuable shares                     8,472
Convertible preferred shares                 1,285,848 808,367  
Weighted average common shares outstanding, diluted 21,379 21,476 19,909 19,190 19,159 19,206 18,534 17,887 20,481,398 18,691,081 17,822,944
Basic earnings per common share $ 0.41 $ 0.49 $ 0.20 $ 0.32 $ 0.16 $ 0.28 $ 0.31 $ 0.32 $ 1.44 $ 1.08 $ 1.23
Diluted earnings per common share $ 0.39 $ 0.47 $ 0.20 $ 0.31 $ 0.17 $ 0.28 $ 0.31 $ 0.32 $ 1.40 $ 1.07 $ 1.23