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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
 
(In thousands, except per share data)
Net income
$
200,274

 
$
188,301

 
$
190,509

Preferred stock dividends
(8,903
)
 
(7,155
)
 
(5,002
)
Net income available to common equity
$
191,371

 
$
181,146

 
$
185,507

Common shareholder dividends
(67,100
)
 
(61,774
)
 
(58,123
)
Unvested share-based payment awards
(755
)
 
(626
)
 
(587
)
Undistributed earnings
$
123,516

 
$
118,746

 
$
126,797

Undistributed earnings allocated to common shareholders
122,205

 
117,498

 
125,646

Undistributed earnings allocated to unvested share-based payment awards
1,311

 
1,248

 
1,151

Undistributed earnings
$
123,516

 
$
118,746

 
$
126,797

Basic
 
 
 
 
 
Distributed earnings to common shareholders
$
67,100

 
$
61,774

 
$
58,123

Undistributed earnings allocated to common shareholders
122,205

 
117,498

 
125,646

Total common shareholders earnings, basic
$
189,305

 
$
179,272

 
$
183,769

Diluted
 
 
 
 
 
Distributed earnings to common shareholders
$
67,100

 
$
61,774

 
$
58,123

Undistributed earnings allocated to common shareholders
122,205

 
117,498

 
125,646

Total common shareholders earnings, diluted
$
189,305

 
$
179,272

 
$
183,769

Weighted average common shares outstanding
148,769

 
149,350

 
157,286

Effect of dilutive common stock awards
1,192

 
1,253

 
968

Diluted weighted average common shares outstanding
149,961

 
150,603

 
158,254

Basic earnings per common share
$
1.27

 
$
1.20

 
$
1.17

Diluted earnings per common share
$
1.26

 
$
1.19

 
$
1.16