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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted earnings per common share
The following table sets forth the computation of basic and diluted earnings per common share:
 
Year ended December 31
(In thousands, except share data)
 
2014
 
2013
 
2012
Numerator:
 
 
 
 
 
 
Net income available to common shareholders
 
$
84,090

 
$
77,227

 
$
75,205

Denominator:
 
 
 
 
 
 
Basic earnings per common share:
 
 
 
 
 
 
Weighted-average shares
 
15,394,971

 
15,412,365

 
15,407,078

Effect of dilutive securities – restricted stock units and warrants
 
18,861

 
—

 
1,063

Diluted earnings per common share:
 
 
 
 
 
 
Adjusted weighted-average shares and assumed conversions
 
15,413,832

 
15,412,365

 
15,408,141

Earnings per common share:
 
 
 
 
 
 
Basic earnings per common share
 
$
5.46

 
$
5.01

 
$
4.88

Diluted earnings per common share
 
$
5.46

 
$
5.01

 
$
4.88