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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment $ 13,576,807   $ 12,336,710 $ 11,785,453    
Non-Graded, Recorded Investment 1,790,634   1,871,327 1,898,286    
Total 15,367,441   14,208,037 13,683,739    
Related Allowance [Abstract]            
Internally Risk Graded, Related Allowance 154,618   137,032 135,665    
Non-Graded, Related Allowance 21,752   23,979 27,635    
Total, Related Allowance 204,116 $ 201,087 189,056 191,244 $ 190,690 $ 185,396
Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 13,409,685   12,222,486 11,626,985    
Non-Graded, Recorded Investment 1,748,625   1,825,709 1,852,621    
Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 119,784   79,071 107,582    
Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 47,338   35,153 50,886    
Non-Graded, Recorded Investment 42,009   45,618 45,665    
Commercial [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 9,771,003   9,073,030 8,545,949    
Non-Graded, Recorded Investment 26,419   22,640 26,089    
Total 9,797,422   9,095,670 8,572,038    
Related Allowance [Abstract]            
Internally Risk Graded, Related Allowance 108,101   90,085 85,892    
Non-Graded, Related Allowance 892   790 883    
Total, Related Allowance 108,993 107,037 90,875 86,775 87,806 79,180
Commercial [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 9,627,616   9,008,360 8,456,553    
Non-Graded, Recorded Investment 26,343   22,532 26,035    
Commercial [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 109,665   51,251 73,046    
Commercial [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 33,722   13,419 16,350    
Non-Graded, Recorded Investment 76   108 54    
Commercial [Member] | Energy [Member]            
Recorded Investment [Abstract]            
Total 2,838,167   2,860,428 2,551,699    
Commercial [Member] | Energy [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,723,841   2,843,093 2,519,924    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Energy [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 96,446   15,919 30,267    
Commercial [Member] | Energy [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 17,880   1,416 1,508    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Services [Member]            
Recorded Investment [Abstract]            
Total 2,706,624   2,391,530 2,339,951    
Commercial [Member] | Services [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,687,862   2,371,189 2,318,991    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Services [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 8,070   15,140 17,376    
Commercial [Member] | Services [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 10,692   5,201 3,584    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Wholesale/retail [Member]            
Recorded Investment [Abstract]            
Total 1,461,936   1,440,015 1,421,107    
Commercial [Member] | Wholesale/retail [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,455,636   1,427,725 1,412,199    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Wholesale/retail [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,242   8,141 3,406    
Commercial [Member] | Wholesale/retail [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,058   4,149 5,502    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Manufacturing [Member]            
Recorded Investment [Abstract]            
Total 555,677   532,594 479,543    
Commercial [Member] | Manufacturing [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 553,418   527,951 469,881    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Manufacturing [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,907   4,193 6,180    
Commercial [Member] | Manufacturing [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 352   450 3,482    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Healthcare [Member]            
Recorded Investment [Abstract]            
Total 1,741,680   1,454,969 1,382,399    
Commercial [Member] | Healthcare [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,740,462   1,449,024 1,376,399    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Healthcare [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   4,565 4,583    
Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,218   1,380 1,417    
Non-Graded, Recorded Investment 0   0 0    
Commercial [Member] | Other commercial and industrial [Member]            
Recorded Investment [Abstract]            
Total 493,338   416,134 397,339    
Commercial [Member] | Other commercial and industrial [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 466,397   389,378 359,159    
Non-Graded, Recorded Investment 26,343   22,532 26,035    
Commercial [Member] | Other commercial and industrial [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   3,293 11,234    
Commercial [Member] | Other commercial and industrial [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 522   823 857    
Non-Graded, Recorded Investment 76   108 54    
Commercial Real Estate [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,235,067   2,728,150 2,724,199    
Non-Graded, Recorded Investment 0   0 0    
Total 3,235,067   2,728,150 2,724,199    
Related Allowance [Abstract]            
Internally Risk Graded, Related Allowance 41,789   42,445 42,433    
Non-Graded, Related Allowance 0   0 0    
Total, Related Allowance 41,789 39,744 42,445 42,433 41,252 41,573
Commercial Real Estate [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,214,925   2,683,565 2,660,335    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 9,186   26,028 33,204    
Commercial Real Estate [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 10,956   18,557 30,660    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Residential construction and land development [Member]            
Recorded Investment [Abstract]            
Total 153,510   143,591 175,228    
Commercial Real Estate [Member] | Residential construction and land development [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 148,392   127,437 145,223    
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 370   10,855 15,371    
Commercial Real Estate [Member] | Residential construction and land development [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 4,748   5,299 14,634    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Retail [Member]            
Recorded Investment [Abstract]            
Total 769,449   666,889 611,265    
Commercial Real Estate [Member] | Retail [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 767,368   662,335 605,718    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Retail [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 433   628 1,538    
Commercial Real Estate [Member] | Retail [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 1,648   3,926 4,009    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Office [Member]            
Recorded Investment [Abstract]            
Total 626,151   415,544 438,909    
Commercial Real Estate [Member] | Office [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 624,907   411,548 434,829    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Office [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 560   576 581    
Commercial Real Estate [Member] | Office [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 684   3,420 3,499    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Multifamily [Member]            
Recorded Investment [Abstract]            
Total 758,658   704,298 739,757    
Commercial Real Estate [Member] | Multifamily [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 750,791   691,053 725,720    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Multifamily [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 7,682   13,245 14,037    
Commercial Real Estate [Member] | Multifamily [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 185   0 0    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Industrial [Member]            
Recorded Investment [Abstract]            
Total 563,871   428,817 371,426    
Commercial Real Estate [Member] | Industrial [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 563,795   428,817 371,426    
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   0 0    
Non-Graded, Recorded Investment 0   0 0    
Commercial Real Estate [Member] | Other commercial real estate [Member]            
Recorded Investment [Abstract]            
Total 363,428   369,011 387,614    
Commercial Real Estate [Member] | Other commercial real estate [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 359,672   362,375 377,419    
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 141   724 1,677    
Commercial Real Estate [Member] | Other commercial real estate [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 3,615   5,912 8,518    
Non-Graded, Recorded Investment 0   0 0    
Residential Mortgage [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 190,361   192,303 200,701    
Non-Graded, Recorded Investment 1,678,634   1,757,209 1,778,962    
Total 1,868,995   1,949,512 1,979,663    
Related Allowance [Abstract]            
Internally Risk Graded, Related Allowance 2,938   2,996 4,083    
Non-Graded, Related Allowance 17,921   20,462 23,133    
Total, Related Allowance 20,859 21,449 23,458 27,216 27,654 29,465
Residential Mortgage [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 186,923   187,520 195,688    
Non-Graded, Recorded Investment 1,637,055   1,712,098 1,733,756    
Residential Mortgage [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 918   1,773 1,312    
Residential Mortgage [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,520   3,010 3,701    
Non-Graded, Recorded Investment 41,579   45,111 45,206    
Residential Mortgage [Member] | Permanent mortgage [Member]            
Recorded Investment [Abstract]            
Total 937,664   969,951 991,107    
Residential Mortgage [Member] | Permanent mortgage [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 186,923   187,520 195,688    
Non-Graded, Recorded Investment 719,163   745,813 758,970    
Residential Mortgage [Member] | Permanent mortgage [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 918   1,773 1,312    
Residential Mortgage [Member] | Permanent mortgage [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 2,520   3,010 3,701    
Non-Graded, Recorded Investment 28,140   31,835 31,436    
Residential Mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]            
Recorded Investment [Abstract]            
Total 192,712   205,950 198,488    
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 188,827   202,238 194,653    
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 3,885   3,712 3,835    
Residential Mortgage [Member] | Home equity {Member]            
Recorded Investment [Abstract]            
Total 738,619   773,611 790,068    
Residential Mortgage [Member] | Home equity {Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 0   0 0    
Non-Graded, Recorded Investment 729,065   764,047 780,133    
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 9,554   9,564 9,935    
Personal [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 380,376   343,227 314,604    
Non-Graded, Recorded Investment 85,581   91,478 93,235    
Total 465,957   434,705 407,839    
Related Allowance [Abstract]            
Internally Risk Graded, Related Allowance 1,790   1,506 3,257    
Non-Graded, Related Allowance 2,939   2,727 3,619    
Total, Related Allowance 4,729 3,955 4,233 6,876 7,029 6,965
Personal [Member] | Performing [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 380,221   343,041 314,409    
Non-Graded, Recorded Investment 85,227   91,079 92,830    
Personal [Member] | Potential Problem [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 15   19 20    
Personal [Member] | Nonaccrual [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 140   167 175    
Non-Graded, Recorded Investment 354   399 405    
Specific Allowance [Member]            
Recorded Investment [Abstract]            
Internally Risk Graded, Recorded Investment 13,576,807   12,336,710 11,785,453    
Non-Graded, Recorded Investment 1,790,634   1,871,327 1,898,286    
Total 15,367,441   14,208,037 13,683,739    
Related Allowance [Abstract]            
Internally Risk Graded, Related Allowance 154,618   137,032 135,665    
Non-Graded, Related Allowance 21,752   23,979 27,635    
Total, Related Allowance 176,370   161,011 163,300    
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 $ 27,746 $ 28,902 $ 28,045 $ 27,944 $ 26,949 $ 28,213