Annual report pursuant to Section 13 and 15(d)

Earnings Per Share (Details)

v2.4.0.6
Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic earnings per common share:                      
Net income $ 167,279 $ 167,767 $ 152,706 $ 153,270 $ 126,858 $ 143,391 $ 145,918 $ 126,446 $ 641,022 $ 542,613 $ 312,347
Preferred stock dividends, deemed dividend and accretion of discount (7,973) (7,983) (7,984) (8,049) (7,703) (7,703) (7,704) (7,703) (31,989) (30,813) (172,032)
Net income applicable to common shareholders 159,306 159,784 144,722 145,221 119,155 135,688 138,214 118,743 609,033 511,800 140,315
Average common shares issued and outstanding                 857,962,000 863,691,000 726,934,000
Basic earnings per common share $ 0.19 $ 0.19 $ 0.17 $ 0.17 $ 0.14 $ 0.16 $ 0.16 $ 0.14 $ 0.71 $ 0.59 $ 0.19
Diluted earnings per common share                      
Net income applicable to common shareholders 159,306 159,784 144,722 145,221 119,155 135,688 138,214 118,743 609,033 511,800 140,315
Effect of assumed preferred stock conversion 7,973 7,983 7,984 8,049 7,703 7,703 7,704 7,703 31,989 30,813 172,032
Net income applicable to diluted earnings per share                 $ 609,033 $ 511,800 $ 140,315
Average common shares issued and outstanding                 857,962,000 863,691,000 726,934,000
Dilutive potential common shares:                      
Stock options and restricted stock units                 4,202,000 2,916,000 1,722,000
Shares held in deferred compensation plans                 1,238,000 1,017,000 876,000
Incremental Common Shares Attributable to Conversion of Preferred Stock                 0 0 0
Dilutive potential common shares:                 5,440,000 3,933,000 2,598,000
Total diluted average common shares issued and outstanding                 863,402,000 867,624,000 729,532,000
Diluted earnings (loss) per common share $ 0.19 $ 0.19 $ 0.17 $ 0.17 $ 0.14 $ 0.16 $ 0.16 $ 0.14 $ 0.71 $ 0.59 $ 0.19
Earnings Loss Per Share (Textuals) [Abstract]                      
Options outstanding to purchase common stock shares having antidilutive effect                 24,400,000 23,600,000 18,500,000