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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per share
 
Three Months Ended
(in thousands, except share and per share data)
3/31/2017
 
3/31/2016
Basic
 

 
 

Net income available to common shareholders
$
15,717

 
$
14,251

Less: Income attributable to unvested stock-based compensation awards
(261
)
 
(230
)
Net earnings allocated to common shareholders
15,456

 
14,021

 
 
 
 
Weighted average shares outstanding, including unvested stock-based compensation awards
15,151,521

 
15,002,332

 
 
 
 
Less: unvested stock-based compensation awards
(250,583
)
 
(242,056
)
Weighted average shares outstanding - Basic
14,900,938

 
14,760,276

 
 
 
 
Diluted
 

 
 

Net earnings allocated to common shareholders
15,456

 
14,021

 
 
 
 
Weighted average shares outstanding - Basic
14,900,938

 
14,760,276

 
 
 
 
Plus:  incremental shares from assumed conversion of stock--based compensation awards
141,676

 
87,340

 
 
 
 
Weighted average shares outstanding - Diluted
15,042,614

 
14,847,616

 
 
 
 
Basic EPS
1.04

 
0.95

Diluted EPS
1.03

 
0.94

Earnings per share in the table below, for the three month periods ended March 31, 2017 and 2016 are calculated under the two-class method as required by ASC Topic 260, Earnings Per Share.