Quarterly Results of Operations (Unaudited) (Tables)

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Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Results of Operations [Table Text Block]	2014 (dollar amounts in thousands, except per share data) Fourth Third Second First Interest income $ 507,625 $ 501,060 $ 495,322 $ 472,455 Interest expense 34,373 34,725 35,274 34,949 Net interest income 473,252 466,335 460,048 437,506 Provision for credit losses 2,494 24,480 29,385 24,630 Noninterest income 233,278 247,349 250,067 248,485 Noninterest expense 483,271 480,318 458,636 460,121 Income before income taxes 220,765 208,886 222,094 201,240 Provision for income taxes 57,151 53,870 57,475 52,097 Net income 163,614 155,016 164,619 149,143 Dividends on preferred shares 7,963 7,964 7,963 7,964 Net income applicable to common shares $ 155,651 $ 147,052 $ 156,656 $ 141,179 Net income per common share -- Basic $ 0.19 $ 0.18 $ 0.19 $ 0.17 Net income per common share -- Diluted 0.19 0.18 0.19 0.17 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