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   249,892     253,767     251,919     256,618   Noninterest expense   446,009     423,336     445,865     442,793   Income before income taxes   210,201     243,883     206,269     208,403   Provision for income taxes   52,029     65,047     55,269     55,129   Net income   158,172     178,836     151,000     153,274   Dividends on preferred shares   7,965     7,967     7,967     7,970   Net income applicable to common shares $ 150,207   $ 170,869   $ 143,033   $ 145,304                             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   299,499     262,916     256,738     287,168   Noninterest expense   470,628     458,303     444,269     462,676   Income before income taxes   223,468     197,907     204,911     207,295   Provision for income taxes   58,890     32,840     53,835     56,726   Net income   164,578     165,067     151,076     150,569   Dividends declared on preferred shares   7,973     7,983     7,984     8,049   Net income applicable to common shares $ 156,605   $ 157,084   $ 143,092   $ 142,520                             Net income per common share -- Basic $ 0.18   $ 0.18   $ 0.17   $ 0.16   Net income per common share -- Diluted   0.18     0.18     0.16     0.16