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Net Income per Share of Common Stock (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share:
Year ended December 31,
(dollars in thousands, except earnings per share)
 
2012
 
2011
 
2010
Numerator for earnings per share:
 
 
 
 
 
 
Net income that is available to common shareholders
 
$
6,966

 
$
23,641

 
$
70,086

 
 
 

 
 

 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
Weighted average shares outstanding
 
20,875,959

 
20,169,638

 
17,668,214

Effect of stock options and restricted stock units
 
439,252

 
492,557

 
501,395

Effect of warrants
 
—

 
145,882

 
1,787,472

Total effect of dilutive securities
 
439,252

 
638,439

 
2,288,867

 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
Adjusted weighted average shares and assumed conversions
 
21,315,211

 
20,808,077

 
19,957,081

 
 
 
 
 
 
 
Basic earnings per share
 
$
0.33

 
$
1.17

 
$
3.97

 
 
 
 
 
 
 
Diluted earnings per share
 
$
0.33

 
$
1.14

 
$
3.51