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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2018
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 Three Months Ended March 31,
 
2018
 
2017
 
(In Thousands, except per share data)
Net income
$
69,456

 
$
56,270

Preferred stock dividends
(2,339
)
 
(2,330
)
Net income available to common equity
$
67,117

 
$
53,940

Common shareholder dividends
(25,572
)
 
(18,251
)
Unvested share-based payment awards
(138
)
 
(117
)
Undistributed earnings
$
41,407

 
$
35,572

Undistributed earnings allocated to common shareholders
41,225

 
35,294

Undistributed earnings allocated to unvested share-based payment awards
182

 
278

Undistributed earnings
$
41,407

 
$
35,572

Basic
 
 
 
Distributed earnings to common shareholders
$
25,572

 
$
18,251

Undistributed earnings allocated to common shareholders
41,225

 
35,294

Total common shareholders earnings, basic
$
66,797

 
$
53,545

Diluted
 
 
 
Distributed earnings to common shareholders
$
25,572

 
$
18,251

Undistributed earnings allocated to common shareholders
41,225

 
35,294

Total common shareholders earnings, diluted
$
66,797

 
$
53,545

Weighted average common shares outstanding
163,520

 
150,815

Effect of dilutive common stock awards
2,038

 
2,216

Effect of dilutive common stock warrants
874

 
838

Diluted weighted average common shares outstanding
166,432

 
153,869

Basic earnings per common share
$
0.41

 
$
0.36

Diluted earnings per common share
$
0.40

 
$
0.35