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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment $ 14,238,448 $ 14,150,992 $ 12,840,895  
Non-Graded, Recorded Investment 1,784,118 1,790,162 1,843,241  
Total 16,022,566 15,941,154 14,684,136  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 189,116 175,090 145,825  
Non-Graded, Related Allowance 18,619 20,308 23,788  
Total, Related Allowance 233,156 225,524 197,686 $ 189,056
Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,591,938 13,908,728 12,687,045  
Non-Graded, Recorded Investment 1,728,595 1,730,775 1,798,601  
Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 460,203 154,523 117,757  
Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 186,307 87,741 36,093  
Non-Graded, Recorded Investment 55,523 59,387 44,640  
Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,264,965 10,227,303 9,367,119  
Non-Graded, Recorded Investment 23,460 25,228 24,044  
Total 10,288,425 10,252,531 9,391,163  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 138,887 129,426 100,592  
Non-Graded, Related Allowance 906 908 819  
Total, Related Allowance 139,793 130,334 101,411 90,875
Commercial [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,641,298 10,006,226 9,252,509  
Non-Graded, Recorded Investment 23,376 25,101 23,957  
Commercial [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 449,099 144,780 100,817  
Commercial [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 174,568 76,297 13,793  
Non-Graded, Recorded Investment 84 127 87  
Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Total 3,029,420 3,097,328 2,902,994  
Commercial [Member] | Energy [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,466,909 2,906,357 2,857,004  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Energy [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 402,958 129,782 44,115  
Commercial [Member] | Energy [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 159,553 61,189 1,875  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Total 2,728,891 2,784,276 2,592,876  
Commercial [Member] | Services [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,712,494 2,767,225 2,573,879  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Services [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,885 6,761 14,253  
Commercial [Member] | Services [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,512 10,290 4,744  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Total 1,451,846 1,422,064 1,405,800  
Commercial [Member] | Wholesale/retail [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,428,215 1,412,780 1,377,439  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Wholesale/retail [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 19,946 6,365 23,960  
Commercial [Member] | Wholesale/retail [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,685 2,919 4,401  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Total 600,645 556,729 560,925  
Commercial [Member] | Manufacturing [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 588,827 554,526 546,566  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Manufacturing [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 11,506 1,872 13,942  
Commercial [Member] | Manufacturing [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 312 331 417  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Total 1,995,425 1,883,380 1,511,177  
Commercial [Member] | Healthcare [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,986,598 1,882,308 1,505,072  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Healthcare [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,804 0 4,547  
Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,023 1,072 1,558  
Non-Graded, Recorded Investment 0 0 0  
Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Total 482,198 508,754 417,391  
Commercial [Member] | Other commercial and industrial [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 458,255 483,030 392,549  
Non-Graded, Recorded Investment 23,376 25,101 23,957  
Commercial [Member] | Other commercial and industrial [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Commercial [Member] | Other commercial and industrial [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 483 496 798  
Non-Graded, Recorded Investment 84 127 87  
Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,370,507 3,259,033 2,935,464  
Non-Graded, Recorded Investment 0 0 0  
Total 3,370,507 3,259,033 2,935,464  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 44,453 41,391 40,819  
Non-Graded, Related Allowance 0 0 0  
Total, Related Allowance 44,453 41,391 40,819 42,445
Commercial Real Estate [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,353,379 3,242,235 2,900,708  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,858 7,797 14,854  
Commercial Real Estate [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,270 9,001 19,902  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Total 171,949 160,426 139,152  
Commercial Real Estate [Member] | Residential construction and land development [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 166,237 155,724 128,795  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Residential construction and land development [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 923 293 759  
Commercial Real Estate [Member] | Residential construction and land development [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,789 4,409 9,598  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Total 810,522 796,499 658,860  
Commercial Real Estate [Member] | Retail [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 808,800 794,754 654,429  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Retail [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 420 426 574  
Commercial Real Estate [Member] | Retail [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,302 1,319 3,857  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Total 695,552 637,707 513,862  
Commercial Real Estate [Member] | Office [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 694,923 636,501 510,881  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Office [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 555 571  
Commercial Real Estate [Member] | Office [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 629 651 2,410  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Total 733,689 751,085 749,986  
Commercial Real Estate [Member] | Multifamily [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 726,933 744,299 737,750  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Multifamily [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,506 6,512 12,236  
Commercial Real Estate [Member] | Multifamily [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 250 274 0  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Total 564,467 563,169 478,584  
Commercial Real Estate [Member] | Industrial [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 564,391 563,093 478,508  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Industrial [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Industrial [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 76 76 76  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Total 394,328 350,147 395,020  
Commercial Real Estate [Member] | Other commercial real estate [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 392,095 347,864 390,345  
Non-Graded, Recorded Investment 0 0 0  
Commercial Real Estate [Member] | Other commercial real estate [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9 11 714  
Commercial Real Estate [Member] | Other commercial real estate [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,224 2,272 3,961  
Non-Graded, Recorded Investment 0 0 0  
Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 192,658 196,701 196,782  
Non-Graded, Recorded Investment 1,676,651 1,680,192 1,730,217  
Total 1,869,309 1,876,893 1,926,999  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 2,822 2,883 3,028  
Non-Graded, Related Allowance 15,645 16,626 20,216  
Total, Related Allowance 18,467 19,509 23,244 23,458
Residential Mortgage [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 187,166 192,456 192,473  
Non-Graded, Recorded Investment 1,621,420 1,621,265 1,685,970  
Residential Mortgage [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,146 1,932 2,069  
Residential Mortgage [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,346 2,313 2,240  
Non-Graded, Recorded Investment 55,231 58,927 44,247  
Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Total 948,405 945,336 964,264  
Residential Mortgage [Member] | Permanent mortgage [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 187,166 192,456 192,473  
Non-Graded, Recorded Investment 730,596 721,964 736,357  
Residential Mortgage [Member] | Permanent mortgage [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,146 1,932 2,069  
Residential Mortgage [Member] | Permanent mortgage [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,346 2,313 2,240  
Non-Graded, Recorded Investment 25,151 26,671 31,125  
Residential Mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Total 197,350 196,937 200,179  
Residential Mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 177,800 175,037 196,923  
Residential Mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Residential Mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 19,550 21,900 3,256  
Residential Mortgage [Member] | Home equity {Member]        
Recorded Investment [Abstract]        
Total 723,554 734,620 762,556  
Residential Mortgage [Member] | Home equity {Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 713,024 724,264 752,690  
Residential Mortgage [Member] | Home equity {Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Residential Mortgage [Member] | Home equity {Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 10,530 10,356 9,866  
Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 410,318 467,955 341,530  
Non-Graded, Recorded Investment 84,007 84,742 88,980  
Total 494,325 552,697 430,510  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 2,954 1,390 1,386  
Non-Graded, Related Allowance 2,068 2,774 2,753  
Total, Related Allowance 5,022 4,164 4,139 4,233
Personal [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 410,095 467,811 341,355  
Non-Graded, Recorded Investment 83,799 84,409 88,674  
Personal [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 100 14 17  
Personal [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 123 130 158  
Non-Graded, Recorded Investment 208 333 306  
Specific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 14,238,448 14,150,992 12,840,895  
Non-Graded, Recorded Investment 1,784,118 1,790,162 1,843,241  
Total 16,022,566 15,941,154 14,684,136  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 189,116 175,090 145,825  
Non-Graded, Related Allowance 18,619 20,308 23,788  
Total, Related Allowance 207,735 195,398 169,613  
Nonspecific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 0 0 0  
Total 0 0 0  
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 0 0 0  
Non-Graded, Related Allowance 0 0 0  
Total, Related Allowance $ 25,421 $ 30,126 $ 28,073 $ 28,045