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Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Determination of Basic Earnings and Diluted Per Common Share by Dividing Net Income        
Net income $ 4,078 $ 5,728 $ 10,079 $ 11,479
Dividends on preferred stock 283 131 566 131
Net income available to common shareholders $ 3,795 $ 5,597 $ 9,513 $ 11,348
Weighted average common shares outstanding, basic 18,561,714 17,895,904 18,205,545 17,882,006
Diluted shares for stock options 41,979 27,497 38,488 6,706
Contingently issuable shares    8,527    8,527
Convertible preferred shares 1,305,549,000 602,561 1,305,549 302,945
Weighted average common shares outstanding, diluted 19,909,242 18,534,489 19,549,582 18,200,184
Basic earnings per common share $ 0.20 $ 0.31 $ 0.52 $ 0.63
Diluted earnings per common share $ 0.20 $ 0.31 $ 0.52 $ 0.63