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Earnings per Share (Tables)
 9 Months Ended
Sep. 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 
 September 30,
 
Nine Months Ended 
 September 30,
(Dollars and shares in thousands, except per share data)
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net income
$
7,528

 
$
6,235

 
$
20,110

 
$
17,041

Net income allocated to unvested restricted stock
(66
)
 
(64
)
 
(177
)
 
(193
)
Net income allocated to common shares
$
7,462

 
$
6,171

 
$
19,933

 
$
16,848

Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share—weighted-average shares outstanding
19,337

 
16,059

 
19,537

 
16,058

Effect of dilutive securities—employee stock options
31

 
23

 
28

 
22

Denominator for diluted earnings per share—adjusted weighted-average shares outstanding
19,368

 
16,082

 
19,565

 
16,080

Basic earnings per share
$
0.39

 
$
0.38

 
$
1.02

 
$
1.05

Diluted earnings per share
$
0.39

 
$
0.38

 
$
1.02

 
$
1.05

Average anti-dilutive options and awards excluded from computation of diluted earnings per share
565

 
554

 
550

 
563