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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | $ 17,691,210 | $ 16,770,208 | $ 16,783,348
Nonaccrual | 165,657 | 187,874 | 245,439
Total | 18,003,696 | 17,153,424 | 17,183,645
Commercial |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 11,210,170 | 10,575,384 | 10,438,108
Nonaccrual | 120,978 | 137,303 | 197,157
Total | 11,349,039 | 10,733,975 | 10,637,955
Commercial | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 3,081,622 | 2,833,668 | 2,723,248
Nonaccrual | 65,597 | 92,284 | 123,992
Total | 3,147,219 | 2,930,156 | 2,847,240
Commercial | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 2,937,699 | 2,983,222 | 2,949,562
Nonaccrual | 4,377 | 2,620 | 7,754
Total | 2,944,499 | 2,986,949 | 2,958,827
Commercial | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,685,175 | 1,468,284 | 1,532,986
Nonaccrual | 14,095 | 2,574 | 10,620
Total | 1,699,554 | 1,471,256 | 1,543,695
Commercial | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 644,825 | 490,739 | 536,481
Nonaccrual | 2,991 | 5,962 | 9,656
Total | 647,816 | 496,774 | 546,137
Commercial | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 2,322,580 | 2,284,770 | 2,196,088
Nonaccrual | 16,125 | 14,765 | 24,505
Total | 2,353,722 | 2,314,753 | 2,221,518
Commercial | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 538,269 | 514,701 | 499,743
Nonaccrual | 17,793 | 19,098 | 20,630
Total | 556,229 | 534,087 | 520,538
Commercial real estate |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 3,710,202 | 3,476,163 | 3,684,343
Nonaccrual | 1,996 | 2,855 | 3,775
Total | 3,712,220 | 3,479,987 | 3,688,592
Commercial real estate | Residential construction and land development [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 118,649 | 115,213 | 139,070
Nonaccrual | 350 | 1,832 | 2,051
Total | 118,999 | 117,245 | 141,592
Commercial real estate | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 766,956 | 691,256 | 722,504
Nonaccrual | 1,068 | 276 | 301
Total | 768,024 | 691,532 | 722,805
Commercial real estate | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 819,852 | 831,118 | 862,577
Nonaccrual | 275 | 275 | 396
Total | 820,127 | 831,770 | 862,973
Commercial real estate | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,056,984 | 979,625 | 952,370
Nonaccrual | 0 | 0 | 10
Total | 1,056,984 | 980,017 | 952,380
Commercial real estate | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 653,384 | 573,014 | 693,635
Nonaccrual | 0 | 0 | 0
Total | 653,384 | 573,014 | 693,635
Commercial real estate | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 294,377 | 285,937 | 314,187
Nonaccrual | 303 | 472 | 1,017
Total | 294,702 | 286,409 | 315,207
Residential mortgage |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,771,319 | 1,754,287 | 1,744,045
Nonaccrual | 42,343 | 47,447 | 44,235
Total | 1,942,250 | 1,973,686 | 1,939,198
Residential mortgage | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 1,041,859 | 1,014,588 | 962,443
Nonaccrual | 23,105 | 25,193 | 23,415
Total | 1,068,412 | 1,043,435 | 989,040
Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 38,717 | 22,692 | 36,867
Nonaccrual | 7,567 | 9,179 | 9,052
Total | 169,653 | 197,506 | 191,729
Residential mortgage | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 690,743 | 717,007 | 744,735
Nonaccrual | 11,671 | 13,075 | 11,768
Total | 704,185 | 732,745 | 758,429
Personal |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Current | 999,519 | 964,374 | 916,852
Nonaccrual | 340 | 269 | 272
Total | 1,000,187 | 965,776 | 917,900
30 to 59 Days [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 21,070 | 41,991 | 24,074
30 to 59 Days [Member] | Commercial |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,955 | 16,215 | 1,109
30 to 59 Days [Member] | Commercial | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
30 to 59 Days [Member] | Commercial | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,619 | 514 | 50
30 to 59 Days [Member] | Commercial | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 284 | 398 | 89
30 to 59 Days [Member] | Commercial | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
30 to 59 Days [Member] | Commercial | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 15,218 | 925
30 to 59 Days [Member] | Commercial | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 52 | 85 | 45
30 to 59 Days [Member] | Commercial real estate |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 476 | 474
30 to 59 Days [Member] | Commercial real estate | Residential construction and land development [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 200 | 471
30 to 59 Days [Member] | Commercial real estate | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
30 to 59 Days [Member] | Commercial real estate | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 254 | 0
30 to 59 Days [Member] | Commercial real estate | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 22 | 0
30 to 59 Days [Member] | Commercial real estate | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
30 to 59 Days [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 3
30 to 59 Days [Member] | Residential mortgage |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 18,937 | 24,619 | 22,004
30 to 59 Days [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 2,568 | 3,435 | 2,024
30 to 59 Days [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 14,757 | 18,978 | 18,416
30 to 59 Days [Member] | Residential mortgage | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 1,612 | 2,206 | 1,564
30 to 59 Days [Member] | Personal |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 178 | 681 | 487
60 to 89 Days [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 29,146 | 19,529 | 15,557
60 to 89 Days [Member] | Commercial |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 15,228 | 4,841 | 299
60 to 89 Days [Member] | Commercial | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 4,204 | 0
60 to 89 Days [Member] | Commercial | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 106 | 486 | 180
60 to 89 Days [Member] | Commercial | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 73 | 0
60 to 89 Days [Member] | Commercial | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 15,017 | 0 | 0
60 to 89 Days [Member] | Commercial | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 105 | 78 | 119
60 to 89 Days [Member] | Commercial real estate |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 370 | 0
60 to 89 Days [Member] | Commercial real estate | 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 | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 370 | 0
60 to 89 Days [Member] | Commercial real estate | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
60 to 89 Days [Member] | Residential mortgage |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 13,768 | 14,127 | 14,969
60 to 89 Days [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 796 | 219 | 1,026
60 to 89 Days [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 12,878 | 13,468 | 13,581
60 to 89 Days [Member] | Residential mortgage | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 94 | 440 | 362
60 to 89 Days [Member] | Personal |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 150 | 191 | 289
90 Days or More [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 96,613 | 133,822 | 115,227
90 Days or More [Member] | Commercial |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 708 | 232 | 1,282
90 Days or More [Member] | Commercial | Energy [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial | Services [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 698 | 107 | 1,281
90 Days or More [Member] | Commercial | Wholesale/retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial | Manufacturing [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial | Healthcare [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial | Other commercial and industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 10 | 125 | 1
90 Days or More [Member] | Commercial real estate |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 22 | 123 | 0
90 Days or More [Member] | Commercial real estate | 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 | Retail [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate | Office [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 123 | 0
90 Days or More [Member] | Commercial real estate | Multifamily [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate | Industrial [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 0 | 0 | 0
90 Days or More [Member] | Commercial real estate | Other commercial real estate [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 22 | 0 | 0
90 Days or More [Member] | Residential mortgage |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 95,883 | 133,206 | 113,945
90 Days or More [Member] | Residential mortgage | Permanent mortgage [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 84 | 0 | 132
90 Days or More [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 95,734 | 133,189 | 113,813
90 Days or More [Member] | Residential mortgage | Home equity [Member] |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | 65 | 17 | 0
90 Days or More [Member] | Personal |  |  |
Financing receivable, recorded investment, aging [Abstract] |  |  |
Past Due | $ 0 | $ 261 | $ 0

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