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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | $ 18,041,031 | $ 16,770,208 | $ 16,803,397
Nonaccrual | 152,992 | 187,874 | 225,636
Total | 18,349,459 | 17,153,424 | 17,206,834
Commercial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 11,456,186 | 10,575,384 | 10,606,851
Nonaccrual | 109,490 | 137,303 | 176,900
Total | 11,576,101 | 10,733,975 | 10,795,934
Commercial [Member] | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 3,240,684 | 2,833,668 | 2,752,259
Nonaccrual | 54,033 | 92,284 | 110,683
Total | 3,294,867 | 2,930,156 | 2,867,981
Commercial [Member] | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 3,006,581 | 2,983,222 | 2,963,746
Nonaccrual | 4,097 | 2,620 | 1,174
Total | 3,017,311 | 2,986,949 | 2,967,513
Commercial [Member] | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,641,447 | 1,468,284 | 1,654,018
Nonaccrual | 9,249 | 2,574 | 1,893
Total | 1,650,729 | 1,471,256 | 1,658,098
Commercial [Member] | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 648,242 | 490,739 | 508,231
Nonaccrual | 9,202 | 5,962 | 9,059
Total | 660,582 | 496,774 | 519,446
Commercial [Member] | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 2,421,166 | 2,284,770 | 2,214,849
Nonaccrual | 15,704 | 14,765 | 24,446
Total | 2,437,323 | 2,314,753 | 2,239,451
Commercial [Member] | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 498,066 | 514,701 | 513,748
Nonaccrual | 17,205 | 19,098 | 29,645
Total | 515,289 | 534,087 | 543,445
Commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 3,802,050 | 3,476,163 | 3,513,942
Nonaccrual | 1,316 | 2,855 | 2,975
Total | 3,804,675 | 3,479,987 | 3,518,142
Commercial real estate [Member] | Residential construction and land development [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 101,185 | 115,213 | 109,994
Nonaccrual | 350 | 1,832 | 1,924
Total | 101,872 | 117,245 | 112,102
Commercial real estate [Member] | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 758,646 | 691,256 | 724,850
Nonaccrual | 777 | 276 | 289
Total | 759,423 | 691,532 | 725,865
Commercial real estate [Member] | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 824,829 | 831,118 | 796,687
Nonaccrual | 0 | 275 | 275
Total | 824,829 | 831,770 | 797,089
Commercial real estate [Member] | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,120,166 | 979,625 | 999,009
Nonaccrual | 0 | 0 | 0
Total | 1,120,166 | 980,017 | 999,009
Commercial real estate [Member] | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 696,774 | 573,014 | 591,080
Nonaccrual | 0 | 0 | 0
Total | 696,774 | 573,014 | 591,080
Commercial real estate [Member] | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 300,450 | 285,937 | 292,322
Nonaccrual | 189 | 472 | 487
Total | 301,611 | 286,409 | 292,997
Residential mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,787,081 | 1,754,287 | 1,739,236
Nonaccrual | 41,917 | 47,447 | 45,506
Total | 1,971,742 | 1,973,686 | 1,945,750
Residential mortgage [Member] | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,064,618 | 1,014,588 | 985,183
Nonaccrual | 22,855 | 25,193 | 24,623
Total | 1,094,926 | 1,043,435 | 1,013,965
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 39,523 | 22,692 | 25,169
Nonaccrual | 7,790 | 9,179 | 8,891
Total | 180,718 | 197,506 | 187,370
Residential mortgage [Member] | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 682,940 | 717,007 | 728,884
Nonaccrual | 11,272 | 13,075 | 11,992
Total | 696,098 | 732,745 | 744,415
Personal [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 995,714 | 964,374 | 943,368
Nonaccrual | 269 | 269 | 255
Total | 996,941 | 965,776 | 947,008
30 to 59 Days [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 41,167 | 41,991 | 32,750
30 to 59 Days [Member] | Commercial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 8,700 | 16,215 | 4,299
30 to 59 Days [Member] | Commercial [Member] | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 150 | 0 | 0
30 to 59 Days [Member] | Commercial [Member] | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 4,908 | 514 | 2,343
30 to 59 Days [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 33 | 398 | 1,748
30 to 59 Days [Member] | Commercial [Member] | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 3,138 | 0 | 0
30 to 59 Days [Member] | Commercial [Member] | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 453 | 15,218 | 156
30 to 59 Days [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 18 | 85 | 52
30 to 59 Days [Member] | Commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 867 | 476 | 1,038
30 to 59 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 337 | 200 | 184
30 to 59 Days [Member] | Commercial real estate [Member] | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 726
30 to 59 Days [Member] | Commercial real estate [Member] | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 254 | 127
30 to 59 Days [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 22 | 0
30 to 59 Days [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
30 to 59 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 530 | 0 | 1
30 to 59 Days [Member] | Residential mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 30,700 | 24,619 | 24,117
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 5,721 | 3,435 | 3,705
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 23,370 | 18,978 | 17,346
30 to 59 Days [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,609 | 2,206 | 3,066
30 to 59 Days [Member] | Personal [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 900 | 681 | 3,296
60 to 89 Days [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 17,469 | 19,529 | 22,177
60 to 89 Days [Member] | Commercial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,725 | 4,841 | 7,854
60 to 89 Days [Member] | Commercial [Member] | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 4,204 | 5,039
60 to 89 Days [Member] | Commercial [Member] | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,725 | 486 | 250
60 to 89 Days [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 409
60 to 89 Days [Member] | Commercial [Member] | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 73 | 2,156
60 to 89 Days [Member] | Commercial [Member] | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 78 | 0
60 to 89 Days [Member] | Commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 45 | 370 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 370 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 45 | 0 | 0
60 to 89 Days [Member] | Residential mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 15,641 | 14,127 | 14,242
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,732 | 219 | 454
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 13,753 | 13,468 | 13,343
60 to 89 Days [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 156 | 440 | 445
60 to 89 Days [Member] | Personal [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 58 | 191 | 81
90 Days or More [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 96,800 | 133,822 | 122,874
90 Days or More [Member] | Commercial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 232 | 30
90 Days or More [Member] | Commercial [Member] | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial [Member] | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 107 | 0
90 Days or More [Member] | Commercial [Member] | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 30
90 Days or More [Member] | Commercial [Member] | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial [Member] | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial [Member] | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 125 | 0
90 Days or More [Member] | Commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 397 | 123 | 187
90 Days or More [Member] | Commercial real estate [Member] | Residential construction and land development [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate [Member] | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate [Member] | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 123 | 0
90 Days or More [Member] | Commercial real estate [Member] | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate [Member] | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 397 | 0 | 187
90 Days or More [Member] | Residential mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 96,403 | 133,206 | 122,649
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 96,282 | 133,189 | 122,621
90 Days or More [Member] | Residential mortgage [Member] | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 121 | 17 | 28
90 Days or More [Member] | Personal [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | $ 0 | $ 261 | $ 8

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