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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing receivable, recorded investment, aging [Abstract] |  |
Current | $ 22,718,498 | $ 21,392,306
Nonaccrual | 234,693 | 180,951
Total | 23,007,520 | 21,750,987
Past Due 90 Days or More and Accruing | 88,718 | 7,680
30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 68,013 | 47,084
60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 38,782 | 20,560
90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 182,227 | 110,086
Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 12,978,801 | 13,899,429
Nonaccrual | 167,159 | 115,416
Total | 13,077,535 | 14,031,650
Past Due 90 Days or More and Accruing | 4,821 |
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 17,219 | 7,943
Commercial [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 10,504 | 1,608
Commercial [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 71,011 | 7,254
Commercial [Member] | Energy [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,410,995 | 3,881,244
Nonaccrual | 125,059 | 91,722
Total | 3,469,194 | 3,973,377
Past Due 90 Days or More and Accruing | 0 |
Commercial [Member] | Energy [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 12,735 | 401
Commercial [Member] | Energy [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 4,050 | 10
Commercial [Member] | Energy [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 41,414 | 0
Commercial [Member] | Healthcare [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,302,345 | 3,027,329
Nonaccrual | 3,645 | 4,480
Total | 3,305,990 | 3,033,916
Past Due 90 Days or More and Accruing | 0 |
Commercial [Member] | Healthcare [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 | 2,039
Commercial [Member] | Healthcare [Member] | 60 to 89 Days Past Due [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 | 3,645 | 68
Commercial [Member] | Services [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,489,423 | 3,105,621
Nonaccrual | 25,598 | 7,483
Total | 3,508,583 | 3,122,163
Past Due 90 Days or More and Accruing | 326 |
Commercial [Member] | Services [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 3,278 | 1,737
Commercial [Member] | Services [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 177 | 523
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 15,705 | 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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 712
Commercial [Member] | Wholesale/retail [Member] | 60 to 89 Days Past Due [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 | 2,776,038 |
Nonaccrual | 12,857 |
Total | 2,793,768 |
Past Due 90 Days or More and Accruing | 4,495 |
Commercial [Member] | General business [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 1,206 |
Commercial [Member] | General business [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 6,277 |
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 10,247 |
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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 410
Commercial [Member] | Manufacturing [Member] | 60 to 89 Days Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 2,230
Commercial [Member] | Public finance [Member] | 60 to 89 Days Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 414
Commercial [Member] | Other commercial and industrial [Member] | 60 to 89 Days Past Due [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 | 4,672,279 | 4,400,576
Nonaccrual | 27,246 | 27,626
Total | 4,698,538 | 4,433,783
Past Due 90 Days or More and Accruing | 5,126 |
Commercial real estate [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 276 | 4,920
Commercial real estate [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 5,310 | 250
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 20,673 | 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 Past Due [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 Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Retail [Member] | 60 to 89 Days Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Office [Member] | 60 to 89 Days Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Multifamily [Member] | 60 to 89 Days Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 0
Commercial real estate [Member] | Industrial [Member] | 60 to 89 Days Past Due [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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 1,827
Commercial real estate [Member] | Other commercial real estate [Member] | 60 to 89 Days Past Due [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 | 3,385,108 |
Nonaccrual | 40,288 |
Total | 3,549,137 |
Past Due 90 Days or More and Accruing | 78,771 |
Loans to individuals [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 50,518 |
Loans to individuals [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 22,968 |
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 90,543 |
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,849,304 |
Nonaccrual | 32,228 |
Total | 1,863,003 |
Past Due 90 Days or More and Accruing | 181 |
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 5,812 |
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 837 |
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 7,050 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 262,102 |
Nonaccrual | 7,741 |
Total | 408,687 |
Past Due 90 Days or More and Accruing | 78,349 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 41,389 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 22,041 |
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 83,155 |
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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 2,011
Loans to individuals [Member] | Permanent residential mortgage [Member] | 60 to 89 Days Past Due [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 |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Nonaccrual |  | 6,100
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 Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 3,343
Loans to individuals [Member] | Home equity [Member] | 60 to 89 Days Past Due [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 | 1,273,702 | 1,196,362
Nonaccrual | 319 | 287
Total | 1,277,447 | 1,201,382
Past Due 90 Days or More and Accruing | 241 |
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 3,317 | 4,664
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 90 | 54
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 338 | 15
Loans to individuals [Member] | Residential Mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 1,895,939
Nonaccrual |  | 37,622
Total |  | 2,084,172
Loans to individuals [Member] | Residential Mortgage [Member] | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 29,557
Loans to individuals [Member] | Residential Mortgage [Member] | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 18,648
Loans to individuals [Member] | Residential Mortgage [Member] | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 102,406
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current |  | 46,898
Total |  | 197,794
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 24,203
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans | 60 to 89 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | 18,187
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans | 90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due |  | $ 102,406
Paycheck Protection Program |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,682,310 |
Total | 1,682,310 |
Past Due 90 Days or More and Accruing | 0 |
Paycheck Protection Program | 30 to 59 Days Past Due [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 0 |
Paycheck Protection Program | 60 to 89 Days Past Due [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 |

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