Quarterly Results of Operations (Unaudited) (Tables)

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Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Results of Operations [Table Text Block]	2012 (dollar amounts in thousands, except per share data)   Fourth     Third     Second     First                         Interest income $ 478,995   $ 483,787   $ 487,544   $ 479,937 Interest expense   44,940     53,489     58,582     62,728 Net interest income   434,055     430,298     428,962     417,209 Provision for credit losses   39,458     37,004     36,520     34,406 Noninterest income   297,651     261,067     253,819     285,320 Noninterest expense   470,628     458,303     444,269     462,676 Income before income taxes   221,620     196,058     201,992     205,447 Provision for income taxes   54,341     28,291     49,286     52,177 Net income   167,279     167,767     152,706     153,270 Dividends on preferred shares   7,973     7,983     7,984     8,049 Net income applicable to common shares $ 159,306   $ 159,784   $ 144,722   $ 145,221                         Net income per common share -- Basic $ 0.19   $ 0.19   $ 0.17   $ 0.17 Net income per common share -- Diluted   0.19     0.19     0.17     0.17                                                     2011 (dollar amounts in thousands, except per share data)   Fourth     Third     Second     First                         Interest income $ 485,216   $ 490,996   $ 492,137   $ 501,877 Interest expense   70,191     84,518     88,800     97,547 Net interest income   415,025     406,478     403,337     404,330 Provision for credit losses   45,291     43,586     35,797     49,385 Noninterest income   229,352     258,559     255,767     236,945 Noninterest expense   430,274     439,118     428,409     430,699 Income before income taxes   168,812     182,333     194,898     161,191 Provision for income taxes   41,954     38,942     48,980     34,745 Net income   126,858     143,391     145,918     126,446 Dividends declared on preferred shares   7,703     7,703     7,704     7,703 Net income applicable to common shares $ 119,155   $ 135,688   $ 138,214   $ 118,743                         Net income per common share -- Basic $ 0.14   $ 0.16   $ 0.16   $ 0.14 Net income per common share -- Diluted   0.14     0.16     0.16     0.14