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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Basic and Diluted Earnings (Loss) Per Share
The following is a reconciliation of the outstanding shares used in the basic and diluted earnings per share calculations. 
(Dollars in thousands, except per share data)
For the Year Ended December 31,
 
2017
 
2016
 
2015
Net income
$
93,949

 
87,802

 
83,722

Basic weighted average common shares outstanding
64,384,851

 
63,643,622

 
62,945,669

Plus:
 
 
 
 
 
Dilutive shares
194,371

 
208,364

 
169,049

Diluted weighted average common shares outstanding
64,579,222

 
63,851,986

 
63,114,718

Earnings per share:
 
 
 
 
 
Basic
$
1.46

 
1.38

 
1.33

Diluted
$
1.45

 
1.38

 
1.33