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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 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.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
 
(In thousands, except per share data)
Net income
$
53,816

 
$
49,438

 
$
145,441

 
$
145,510

Preferred stock dividends
(2,188
)
 
(2,184
)
 
(6,555
)
 
(4,957
)
Net income available to common equity
$
51,628

 
$
47,254

 
$
138,886

 
$
140,553

Common shareholder dividends
$
(16,431
)
 
$
(14,927
)
 
$
(49,077
)
 
$
(45,149
)
Unvested share-based payment awards
(177
)
 
(164
)
 
(565
)
 
(450
)
Undistributed earnings
$
35,020

 
$
32,163

 
$
89,244

 
$
94,954

Undistributed earnings allocated to common shareholders
$
34,645

 
$
31,813

 
$
88,294

 
$
93,961

Undistributed earnings allocated to unvested share-based payment awards
375

 
350

 
950

 
993

Undistributed earnings
$
35,020

 
$
32,163

 
$
89,244

 
$
94,954

Basic
 
 
 
 
 
 
 
Distributed earnings to common shareholders
$
16,431

 
$
14,927

 
$
49,077

 
$
45,149

Undistributed earnings allocated to common shareholders
34,645

 
31,813

 
88,294

 
93,961

Total common shareholders earnings, basic
$
51,076

 
$
46,740

 
$
137,371

 
$
139,110

Diluted
 
 
 
 
 
 
 
Distributed earnings to common shareholders
$
16,431

 
$
14,927

 
$
49,077

 
$
45,149

Undistributed earnings allocated to common shareholders
34,645

 
31,813

 
88,294

 
93,961

Total common shareholders earnings, diluted
$
51,076

 
$
46,740

 
$
137,371

 
$
139,110

Weighted average common shares outstanding
148,708

 
148,614

 
148,607

 
149,524

Effect of dilutive common stock awards
1,265

 
1,185

 
1,038

 
1,180

Diluted weighted average common shares outstanding
149,973

 
149,799

 
149,645

 
150,704

Basic earnings per common share
$
0.34

 
$
0.31

 
$
0.92

 
$
0.93

Diluted earnings per common share
$
0.34

 
$
0.31

 
$
0.92

 
$
0.92