Quarterly Results of Operations (Unaudited) (Tables)

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Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Results of Operations [Table Text Block]	2013 (dollar amounts in thousands, except per share data)   Fourth     Third     Second     First                         Interest income $ 469,824   $ 462,912   $ 462,582   $ 465,319 Interest expense   39,175     38,060     37,645     41,149 Net interest income   430,649     424,852     424,937     424,170 Provision for credit losses   24,331     11,400     24,722     29,592 Noninterest income   246,628     250,503     248,655     252,209 Noninterest expense   446,009     423,336     445,865     442,793 Income before income taxes   206,937     240,619     203,005     203,994 Provision for income taxes   49,114     62,132     52,354     52,214 Net income   157,823     178,487     150,651     151,780 Dividends on preferred shares   7,965     7,967     7,967     7,970 Net income applicable to common shares $ 149,858   $ 170,520   $ 142,684   $ 143,810                         Net income per common share -- Basic $ 0.18   $ 0.21   $ 0.17   $ 0.17 Net income per common share -- Diluted   0.18     0.20     0.17     0.17                                                     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 declared 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