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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Basic and diluted earnings per share
Basic and diluted earnings per share has been computed based on the following:
 
Three Months ended
 
Six Months ended
(Dollars in thousands, except per share data)
June 30,
2015
 
June 30,
2014
 
June 30,
2015
 
June 30,
2014
Net income available to common stockholders, basic and diluted
$
29,335

 
28,677

 
57,005

 
55,407

Average outstanding shares - basic
75,530,591

 
74,467,576

 
75,369,366

 
74,452,568

Add: dilutive stock options and awards
35,064

 
32,084

 
38,255

 
38,891

Average outstanding shares - diluted
75,565,655

 
74,499,660

 
75,407,621

 
74,491,459

Basic earnings per share
$
0.39

 
0.38

 
0.76

 
0.74

Diluted earnings per share
$
0.39

 
0.38

 
0.76

 
0.74