For the Years Ended December 31,

($ in Thousands, except per share data)

2020

2019

2018

Net income

$

306,771

$

326,790

$

333,562

Preferred stock dividends

(18,358)

(15,202)

(10,784)

Net income available to common equity

288,413

311,587

322,779

Common shareholder dividends

(111,291)

(111,091)

(104,981)

Unvested share-based payment awards

(732)

(713)

(537)

Undistributed earnings

176,390

199,784

217,260

Undistributed earnings allocated to common shareholders

175,134

198,424

216,199

Undistributed earnings allocated to unvested share-based payment awards

1,256

1,360

1,060

Undistributed earnings

$

176,390

$

199,784

$

217,260

Basic

Distributed earnings to common shareholders

$

111,291

$

111,091

$

104,981

Undistributed earnings allocated to common shareholders

175,134

198,424

216,199

Total common shareholders earnings, basic

$

286,425

$

309,514

$

321,181

Diluted

Distributed earnings to common shareholders

$

111,291

$

111,091

$

104,981

Undistributed earnings allocated to common shareholders

175,134

198,424

216,199

Total common shareholders earnings, diluted

$

286,425

$

309,514

$

321,181

Weighted average common shares outstanding

$

153,005

$

160,534

$

167,345

Effect of dilutive common stock awards

637

1,398

1,985

Effect of dilutive common stock warrants

—

402

Diluted weighted average common shares outstanding

$

153,642

$

161,932

$

169,732

Basic earnings per common share

$

1.87

$

1.93

$

1.92

Diluted earnings per common share

$

1.86

$

1.91

$

1.89