Quarterly Results of Operations (Unaudited) (Tables)

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Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Results of Operations [Table Text Block]	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 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                                                     2010 (dollar amounts in thousands, except per share data)   Fourth     Third     Second     First                         Interest income $ 528,291   $ 534,669   $ 535,653   $ 546,779 Interest expense   112,997     124,707     135,997     152,886 Net interest income   415,294     409,962     399,656     393,893 Provision for credit losses   86,973     119,160     193,406     235,008 Noninterest income   264,220     267,143     269,643     240,852 Noninterest expense   434,593     427,309     413,810     398,093 Loss before income taxes   157,948     130,636     62,083     1,644 Provision (benefit) for income taxes   35,048     29,690     13,319     (38,093) Net income   122,900     100,946     48,764     39,737 Dividends declared on preferred shares   83,754     29,495     29,426     29,357 Net income applicable to common shares $ 39,146   $ 71,451   $ 19,338   $ 10,380                         Net income per common share -- Basic $ 0.05   $ 0.10   $ 0.03   $ 0.01 Net income per common share -- Diluted   0.05     0.10     0.03     0.01