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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2012
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)
 
2012
 
2011
 
2010
Numerator:
 
 
 
 
 
 
Net income available to common shareholders
 
$
75,205

 
$
76,284

 
$
52,294

Denominator:
 
 
 
 
 
 
Basic earnings per common share:
 
 
 
 
 
 
Weighted-average shares
 
15,407,078

 
15,400,155

 
15,152,692

Effect of dilutive securities – stock options and warrants
 
1,063

 
1,291

 
3,043

Diluted earnings per common share:
 
 
 
 
 
 
Adjusted weighted-average shares and assumed conversions
 
15,408,141

 
15,401,446

 
15,155,735

Earnings per common share:
 
 
 
 
 
 
Basic earnings per common share
 
$
4.88

 
$
4.95

 
$
3.45

Diluted earnings per common share
 
$
4.88

 
$
4.95

 
$
3.45