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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Numerator and denominator of the basic and diluted earnings per common share computations
The following summarizes the numerator and denominator of the basic and diluted earnings per common share computations:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(In thousands, except per share data)
Numerator for both basic and diluted earnings per common share, net income
 
$
14,203

 
$
13,866

 
$
27,437

 
$
26,240

Denominator for basic earnings per common share, weighted average common shares outstanding
 
27,534

 
27,493

 
27,527

 
27,486

Weighted average common stock equivalents
 
140

 
84

 
131

 
72

Denominator for diluted earnings per common share
 
27,674

 
27,577

 
27,658

 
27,558

Basic earnings per common share
 
$
0.52

 
$
0.50

 
$
1.00

 
$
0.95

Diluted earnings per common share
 
0.51

 
0.50

 
0.99

 
0.95