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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share, Basic and Diluted [Abstract]  
Summary of Computation for Basic and Diluted Earnings per Share
The following table sets forth the computation of basic and diluted earnings per share:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(Dollars and shares in thousands, except per share data)
2015
 
2014
 
2015
 
2014
Numerator for basic and diluted earnings per share—income available to common shareholders
$
6,466

 
$
5,080

 
$
12,582

 
$
10,806

Denominator for basic earnings per share—weighted-average shares outstanding
19,675

 
16,243

 
19,812

 
16,250

Effect of dilutive securities—employee stock options and awards
98

 
86

 
99

 
86

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
19,773

 
16,329

 
19,911

 
16,336

Basic earnings per share
$
0.33

 
$
0.31

 
$
0.64

 
$
0.67

Diluted earnings per share
$
0.33

 
$
0.31

 
$
0.63

 
$
0.66

Average anti-dilutive options and awards excluded from computation of diluted earnings per share
507

 
521

 
489

 
502