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Earnings per Share
 9 Months Ended
Sep. 30, 2015
Earnings Per Share, Basic and Diluted [Abstract]  
Earnings per Share
Earnings per Share
The Corporation uses the two-class method to calculate earnings per share as the unvested restricted stock issued under the Corporation's equity incentive plans are participating shares with nonforfeitable rights to dividends. Under the two-class method, earnings per common share are computed by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding for the period. In applying the two-class method, undistributed earnings are allocated to both common shares and participating securities based on the number of weighted average shares outstanding during the period.
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