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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing receivable, recorded investment, aging [Abstract] |  |
Current | $ 23,383,412 | $ 21,392,306
Nonaccrual | 221,153 | 180,951
Total | 23,803,300 | 21,750,987
Past Due 90 Days or More and Accruing | 124,872 | 7,680
30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 119,679 | 47,084
60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 42,045 | 20,560
90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 258,164 | 110,086
Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 13,397,500 | 13,899,429
Nonaccrual | 169,953 | 115,416
Total | 13,565,706 | 14,031,650
Past Due 90 Days or More and Accruing | 672 |
Commercial [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 52,988 | 7,943
Commercial [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 5,510 | 1,608
Commercial [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 109,708 | 7,254
Commercial [Member] | Energy [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,603,548 | 3,881,244
Nonaccrual | 126,816 | 91,722
Total | 3,717,101 | 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 | 27,064 | 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 | 86,489 | 0
Commercial [Member] | Healthcare [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,316,556 | 3,027,329
Nonaccrual | 3,645 | 4,480
Total | 3,325,790 | 3,033,916
Past Due 90 Days or More and Accruing | 171 |
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 5,419 | 2,039
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 | 0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 3,815 | 68
Commercial [Member] | Services [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,521,644 | 3,105,621
Nonaccrual | 25,817 | 7,483
Total | 3,545,825 | 3,122,163
Past Due 90 Days or More and Accruing | 58 |
Commercial [Member] | Services [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 6,503 | 1,737
Commercial [Member] | Services [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 5,168 | 523
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 12,510 | 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 | 2,955,752 |
Nonaccrual | 13,675 |
Total | 2,976,990 |
Past Due 90 Days or More and Accruing | 443 |
Commercial [Member] | General business [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 14,002 |
Commercial [Member] | General business [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 342 |
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 6,894 |
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 | 4,673,416 | 4,400,576
Nonaccrual | 12,952 | 27,626
Total | 4,693,700 | 4,433,783
Past Due 90 Days or More and Accruing | 4,771 |
Commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,029 | 4,920
Commercial real estate [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 532 | 250
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 17,723 | 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
Paycheck Protection Program |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 2,097,325 |
Total | 2,097,325 |
Past Due 90 Days or More and Accruing | 0 |
Paycheck Protection Program | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 |
Paycheck Protection Program | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 |
Paycheck Protection Program | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 |
Loans to individuals [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,215,171 | 1,895,939
Nonaccrual | 38,248 | 37,622
Total | 3,446,569 | 2,084,172
Past Due 90 Days or More and Accruing | 119,429 |
Loans to individuals [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 64,662 | 29,557
Loans to individuals [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 36,003 | 18,648
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 130,733 | 102,406
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,830,005 |
Nonaccrual | 31,599 |
Total | 1,849,144 | 2,084,172
Past Due 90 Days or More and Accruing | 2,241 |
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 8,299 |
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 1,128 |
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 9,712 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 172,678 |
Nonaccrual | 6,397 |
Total | 384,247 |
Past Due 90 Days or More and Accruing | 117,188 |
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 | 56,264 |
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 | 34,355 |
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 | 120,950 |
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 | 1,212,488 | 1,196,362
Nonaccrual | 252 | 287
Total | 1,213,178 | 1,201,382
Past Due 90 Days or More and Accruing | 0 |
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 99 | 4,664
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 520 | 54
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | $ 71 | $ 15

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