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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2015
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)
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
 
Net income available to common shareholders
 
$
81,012

 
$
83,957

 
$
76,869

Denominator:
 
 
 
 
 
 
Basic earnings per common share:
 
 
 
 
 
 
Weighted-average common shares outstanding
 
15,364,281

 
15,394,971

 
15,412,365

Effect of dilutive securities – performance based restricted stock units
 
40,459

 
18,861

 
—

Diluted earnings per common share:
 
 
 
 
 
 
Adjusted weighted-average shares and assumed vesting
 
15,404,740

 
15,413,832

 
15,412,365

Earnings per common share:
 
 
 
 
 
 
Basic earnings per common share
 
$
5.27

 
$
5.45

 
$
4.99

Diluted earnings per common share
 
$
5.26

 
$
5.45

 
$
4.99