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Net Income per Share of Common Stock (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 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
$
2,909

 
$
16,719

 
$
12,322

 
$
34,225

 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
21,894,017

 
21,796,172

 
21,869,922

 
21,816,323

 
 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
 
Effect of stock options and restricted stock units
177,176

 
402,536

 
156,304

 
452,161

Adjusted weighted average shares and assumed conversions
22,071,193

 
22,198,708

 
22,026,226

 
22,268,484

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.13

 
$
0.77

 
$
0.56

 
$
1.57

 
 
 
 
 
 
 
 
Diluted earnings per share
$
0.13

 
$
0.75

 
$
0.56

 
$
1.54

 
 
 
 
 
 
 
 
Shares excluded from diluted earnings per share due to:
 
 
 
 
 
 
 
Inclusion would have been anti-dilutive (excluded from calculation)
605,032

 
127,258

 
619,058

 
97,951