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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Calculations for basic and diluted earnings per common share
Presented below are the calculations for basic and diluted earnings per common share.
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
 
(In thousands, except per share data)
Net income
$
188,301

 
$
190,509

 
$
188,692

Preferred stock dividends
(7,155
)
 
(5,002
)
 
(5,158
)
Net income available to common equity
$
181,146

 
$
185,507

 
$
183,534

Common shareholder dividends
(61,774
)
 
(58,123
)
 
(54,505
)
Unvested share-based payment awards
(626
)
 
(587
)
 
(486
)
Undistributed earnings
$
118,746

 
$
126,797

 
$
128,543

Undistributed earnings allocated to common shareholders
117,498

 
125,646

 
127,592

Undistributed earnings allocated to unvested share-based payment awards
1,248

 
1,151

 
951

Undistributed earnings
$
118,746

 
$
126,797

 
$
128,543

Basic
 
 
 
 
 
Distributed earnings to common shareholders
$
61,774

 
$
58,123

 
$
54,505

Undistributed earnings allocated to common shareholders
117,498

 
125,646

 
127,592

Total common shareholders earnings, basic
$
179,272

 
$
183,769

 
$
182,097

Diluted
 
 
 
 
 
Distributed earnings to common shareholders
$
61,774

 
$
58,123

 
$
54,505

Undistributed earnings allocated to common shareholders
117,498

 
125,646

 
127,592

Total common shareholders earnings, diluted
$
179,272

 
$
183,769

 
$
182,097

Weighted average common shares outstanding
149,350

 
157,286

 
165,584

Effect of dilutive common stock awards
1,253

 
968

 
218

Diluted weighted average common shares outstanding
150,603

 
158,254

 
165,802

Basic earnings per common share
$
1.20

 
$
1.17

 
$
1.10

Diluted earnings per common share
$
1.19

 
$
1.16

 
$
1.10