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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]        
Net income $ 5,435 $ 4,078 $ 12,576 $ 10,079
Dividends on preferred stock 253 283 511 566
Net income available to common shareholders $ 5,182 $ 3,795 $ 12,065 $ 9,513
Weighted average common shares outstanding, basic 19,997,991 18,561,714 20,015,247 18,205,545
Diluted shares for stock options and restricted stock 158,679 41,979 158,999 38,488
Weighted average convertible preferred shares 1,183,851 1,305,549 1,192,900 1,305,549
Weighted average common shares outstanding, diluted 21,340,521 19,909,242 21,367,146 19,549,582
Basic earnings per common share $ 0.26 $ 0.20 $ 0.60 $ 0.52
Diluted earnings per common share $ 0.25 $ 0.20 $ 0.59 $ 0.52