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Net Income per Share of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
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 in thousands, except earnings per share)
2016
 
2015
 
2016
 
2015
Numerator for earnings per share:
 
 
 
 
 
 
 
Net income that is available to common shareholders
$
8,695

 
$
14,394

 
$
9,413

 
$
17,506

 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
21,865,315

 
21,775,280

 
21,857,743

 
21,826,566

 
 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
 
Effect of stock options and restricted stock units
138,071

 
458,746

 
143,860

 
478,309

Adjusted weighted average shares and assumed conversions
22,003,386

 
22,234,026

 
22,001,603

 
22,304,875

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.40

 
$
0.66

 
$
0.43

 
$
0.80

 
 
 
 
 
 
 
 
Diluted earnings per share
$
0.40

 
$
0.65

 
$
0.43

 
$
0.78

 
 
 
 
 
 
 
 
Shares excluded from diluted earnings per share due to:
 
 
 
 
 
 
 
Inclusion would have been anti-dilutive (excluded from calculation)
641,964

 
87,164

 
628,134

 
84,046