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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing receivable, recorded investment, aging [Abstract] |  |
Current | $ 22,207,452 | $ 21,392,306
Nonaccrual | 163,172 | 180,951
Total | 22,463,970 | 21,750,987
Past Due 90 Days or More and Accruing | 100,686 | 7,680
30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 49,503 | 47,084
60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 23,311 | 20,560
90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 183,704 | 110,086
Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 14,714,100 | 13,899,429
Nonaccrual | 118,624 | 115,416
Total | 14,795,975 | 14,031,650
Past Due 90 Days or More and Accruing | 788 |
Commercial [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 10,104 | 7,943
Commercial [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 4,960 | 1,608
Commercial [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 66,811 | 7,254
Commercial [Member] | Energy [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 4,058,605 | 3,881,244
Nonaccrual | 96,448 | 91,722
Total | 4,111,676 | 3,973,377
Past Due 90 Days or More and Accruing | 0 |
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 267 | 401
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 | 10
Commercial [Member] | Energy [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 52,804 | 0
Commercial [Member] | Healthcare [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,160,196 | 3,027,329
Nonaccrual | 4,070 | 4,480
Total | 3,165,096 | 3,033,916
Past Due 90 Days or More and Accruing | 714 |
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 46 | 2,039
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 111 | 0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 4,743 | 68
Commercial [Member] | Services [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,941,795 | 3,105,621
Nonaccrual | 8,425 | 7,483
Total | 3,955,748 | 3,122,163
Past Due 90 Days or More and Accruing | 74 |
Commercial [Member] | Services [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 7,173 | 1,737
Commercial [Member] | Services [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 198 | 523
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 6,582 | 6,799
Commercial [Member] | Wholesale/retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 1,758,878
Nonaccrual |  | 1,163
Total |  | 1,760,866
Commercial [Member] | Wholesale/retail [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 712
Commercial [Member] | Wholesale/retail [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 113
Commercial [Member] | Wholesale/retail [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial [Member] | General business [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,553,504 |
Nonaccrual | 9,681 |
Total | 3,563,455 |
Past Due 90 Days or More and Accruing | 0 |
Commercial [Member] | General business [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,618 |
Commercial [Member] | General business [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 4,651 |
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,682 |
Commercial [Member] | Manufacturing [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 654,329
Nonaccrual |  | 10,133
Total |  | 665,449
Commercial [Member] | Manufacturing [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 410
Commercial [Member] | Manufacturing [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 190
Commercial [Member] | Manufacturing [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 387
Commercial [Member] | Public finance [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 707,638
Nonaccrual |  | 0
Total |  | 709,868
Commercial [Member] | Public finance [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 2,230
Commercial [Member] | Public finance [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial [Member] | Public finance [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial [Member] | Other commercial and industrial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 764,390
Nonaccrual |  | 435
Total |  | 766,011
Commercial [Member] | Other commercial and industrial [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 414
Commercial [Member] | Other commercial and industrial [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 772
Commercial [Member] | Other commercial and industrial [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 4,433,887 | 4,400,576
Nonaccrual | 8,545 | 27,626
Total | 4,450,085 | 4,433,783
Past Due 90 Days or More and Accruing | 2,796 |
Commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 4,523 | 4,920
Commercial real estate [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 340 | 250
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 11,335 | 411
Commercial real estate [Member] | Residential construction and land development [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 147,379
Nonaccrual |  | 350
Total |  | 150,879
Commercial real estate [Member] | Residential construction and land development [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 3,093
Commercial real estate [Member] | Residential construction and land development [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Residential construction and land development [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 57
Commercial real estate [Member] | Retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 756,653
Nonaccrual |  | 18,868
Total |  | 775,521
Commercial real estate [Member] | Retail [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Retail [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Retail [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Office [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 928,379
Nonaccrual |  | 0
Total |  | 928,379
Commercial real estate [Member] | Office [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Office [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Office [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Multifamily [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 1,258,704
Nonaccrual |  | 6,858
Total |  | 1,265,562
Commercial real estate [Member] | Multifamily [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Multifamily [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Multifamily [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Industrial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 855,208
Nonaccrual |  | 909
Total |  | 856,117
Commercial real estate [Member] | Industrial [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Industrial [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Industrial [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Other commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 454,253
Nonaccrual |  | 641
Total |  | 457,325
Commercial real estate [Member] | Other commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 1,827
Commercial real estate [Member] | Other commercial real estate [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 250
Commercial real estate [Member] | Other commercial real estate [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 354
Loans to individuals [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,059,465 | 1,895,939
Nonaccrual | 36,003 | 37,622
Total | 3,217,910 | 2,084,172
Past Due 90 Days or More and Accruing | 97,102 |
Loans to individuals [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 34,876 | 29,557
Loans to individuals [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 18,011 | 18,648
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 105,558 | 102,406
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,828,421 |
Nonaccrual | 30,721 |
Total | 1,844,555 | 2,084,172
Past Due 90 Days or More and Accruing | 119 |
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 8,759 |
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 1,717 |
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 5,658 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 55,901 |
Nonaccrual | 5,005 |
Total | 197,889 |
Past Due 90 Days or More and Accruing | 96,980 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 25,948 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 16,217 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 99,823 |
Loans to individuals [Member] | Permanent Residential Mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 1,034,716
Nonaccrual |  | 20,441
Total |  | 1,057,321
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 2,011
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 153
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 46,898
Nonaccrual |  | 6,100
Total |  | 197,794
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 24,203
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 18,187
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 102,406
Loans to individuals [Member] | Home equity [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 814,325
Nonaccrual |  | 11,081
Total |  | 829,057
Loans to individuals [Member] | Home equity [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 3,343
Loans to individuals [Member] | Home equity [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 308
Loans to individuals [Member] | Home equity [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Loans to individuals [Member] | Personal [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,175,143 | 1,196,362
Nonaccrual | 277 | 287
Total | 1,175,466 | 1,201,382
Past Due 90 Days or More and Accruing | 3 |
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 169 | 4,664
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 77 | 54
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | $ 77 | $ 15

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