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Earnings per Share (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 common share:
Year Ended December 31,
2012
 
2011
 
2010
Net income
$
58,224

 
$
44,546

 
$
37,356

Less preferred stock dividends
3,300

 
3,422

 
3,422

Net income available to common shareholders, basic and diluted
$
54,924

 
$
41,124

 
$
33,934

 
 
 
 
 
 
Weighted average common shares outstanding for basic earnings per share computation
42,965,987

 
42,749,526

 
39,907,640

Dilutive effects of stock-based compensation
126,991

 
97,670

 
219,725

Weighted average common shares outstanding for diluted earnings per common share computation
43,092,978

 
42,847,196

 
40,127,365

 
 
 
 
 
 
Basic earnings per common share
$
1.28

 
$
0.96

 
$
0.85

Diluted earnings per common share
$
1.27

 
$
0.96

 
$
0.85