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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Calculation of Basic and Diluted Earnings Per Share
The following table presents the calculation of basic and diluted earnings per share for the periods indicated.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(In thousands, except per share data)
2017
 
2016
 
2017
 
2016
Earnings per common share - basic:
 
 
 
 
 
 
 
Net income
$
52,018

 
$
50,810

 
$
102,491

 
$
93,579

Preferred stock dividends
(949
)
 
(854
)
 
(4,548
)
 
(3,430
)
Dividends and undistributed earnings allocated to unvested restricted shares
(361
)
 
(540
)
 
(707
)
 
(1,003
)
Net income allocated to common shareholders - basic
$
50,708

 
$
49,416

 
$
97,236

 
$
89,146

Weighted average common shares outstanding
50,630

 
40,771

 
48,389

 
40,741

Earnings per common share - basic
1.00

 
1.21

 
2.01

 
2.19

Earnings per common share - diluted:
 
 
 
 
 
 
 
Net income allocated to common shareholders - basic
$
50,708

 
$
49,416

 
$
97,236

 
$
89,146

Dividends and undistributed earnings allocated to unvested restricted shares
(2
)
 
(12
)
 
(39
)
 
(13
)
Net income allocated to common shareholders - diluted
$
50,706

 
$
49,404

 
$
97,197

 
$
89,133

Weighted average common shares outstanding
50,630

 
40,771

 
48,389

 
40,741

Dilutive potential common shares
354

 
137

 
362

 
86

Weighted average common shares outstanding - diluted
50,984

 
40,908

 
48,751

 
40,827

Earnings per common share - diluted
$
0.99

 
$
1.21

 
$
1.99

 
$
2.18