Quarterly report pursuant to Section 13 or 15(d)

Quarterly Results of Operations (Unaudited) (Details)

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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Selected Quarterly Financial Information [Abstract]        
Interest income $ 529,795 $ 495,322 $ 1,031,891 $ 967,777
Interest Expense 39,109 35,274 73,520 70,223
Net interest income 490,686 460,048 958,371 897,554
Provision for credit losses 20,419 29,385 41,010 54,015
Noninterest Income 281,773 250,067 513,396 498,552
Noninterest Expense 491,777 458,636 950,634 918,757
Income before income taxes 260,263 222,094 480,123 423,334
Provision for income taxes 64,057 57,475 118,063 109,572
Net income 196,206 164,619 362,060 313,762
Dividends on preferred shares 7,968 7,963 15,933 15,927
Net income applicable to common shareholders $ 188,238 $ 156,656 $ 346,127 $ 297,835
Earnings Per Share, Basic $ 0.23 $ 0.19 $ 0.43 $ 0.36
Earnings Per Share, Diluted $ 0.23 $ 0.19 $ 0.42 $ 0.36