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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
 
($ in Thousands, Except Per Share Data)
Net income
$
229,264

 
$
200,274

 
$
188,301

Preferred stock dividends
(9,347
)
 
(8,903
)
 
(7,155
)
Net income available to common equity
$
219,917

 
$
191,371

 
$
181,146

Common shareholder dividends
(75,967
)
 
(67,100
)
 
(61,774
)
Unvested share-based payment awards
(450
)
 
(755
)
 
(626
)
Undistributed earnings
$
143,500

 
$
123,516

 
$
118,746

Undistributed earnings allocated to common shareholders
142,593

 
122,205

 
117,498

Undistributed earnings allocated to unvested share-based payment awards
907

 
1,311

 
1,248

Undistributed earnings
$
143,500

 
$
123,516

 
$
118,746

Basic
 
 
 
 
 
Distributed earnings to common shareholders
$
75,967

 
$
67,100

 
$
61,774

Undistributed earnings allocated to common shareholders
142,593

 
122,205

 
117,498

Total common shareholders earnings, basic
$
218,560

 
$
189,305

 
$
179,272

Diluted
 
 
 
 
 
Distributed earnings to common shareholders
$
75,967

 
$
67,100

 
$
61,774

Undistributed earnings allocated to common shareholders
142,593

 
122,205

 
117,498

Total common shareholders earnings, diluted
$
218,560

 
$
189,305

 
$
179,272

Weighted average common shares outstanding
150,877

 
148,769

 
149,350

Effect of dilutive common stock awards
$
2,038

 
$
1,192

 
$
1,253

Effect of dilutive common stock warrants
732

 
—

 
—

Diluted weighted average common shares outstanding
153,647

 
149,961

 
150,603

Basic earnings per common share
$
1.45

 
$
1.27

 
$
1.20

Diluted earnings per common share
$
1.42

 
$
1.26

 
$
1.19