Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE (Details)

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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic earnings per common share:        
Net income $ 271,741 $ 174,540 $ 479,835 $ 345,854
Preferred stock dividends (18,889) (19,874) (37,767) (27,872)
Net income available to common shareholders 252,852 154,666 442,068 317,982
Effect of assumed preferred stock conversion 0 0 0 0
Net income applicable to diluted earnings per share $ 252,852 $ 154,666 $ 442,068 $ 317,982
Average common shares issued and outstanding (in shares) 1,088,934 798,167 1,087,654 796,961
Basic earnings per common share (in usd per share) $ 0.23 $ 0.19 $ 0.41 $ 0.40
Dilutive potential common shares:        
Stock options and restricted stock units and awards 16,329 9,785 17,734 10,085
Shares held in deferred compensation plans 3,108 2,282 3,030 2,178
Other 156 137 154 136
Dilutive potential common shares: 19,593 12,204 20,918 12,399
Total diluted average common shares issued and outstanding (in shares) 1,108,527 810,371 1,108,572 809,360
Diluted earnings per common share (in usd per share) $ 0.23 $ 0.19 $ 0.40 $ 0.39
Employee Stock Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options outstanding to purchase common stock shares having antidilutive effect 2,600 4,700 1,800 4,000