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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | $ 112,058 | $ 88,718
Current and Past Due Performing Loans | 20,347,936 | 23,007,520
Total | 20,347,936 | 23,007,520
30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 48,848 | 68,013
60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23,803 | 38,782
90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 162,390 | 182,227
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 20,112,895 | 22,718,498
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 200 | 4,821
Current and Past Due Performing Loans | 12,175,140 | 13,077,535
Total | 12,175,140 | 13,077,535
Commercial [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,228 | 17,219
Commercial [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,469 | 10,504
Commercial [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 27,679 | 71,011
Commercial [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 12,138,764 | 12,978,801
Commercial [Member] | Energy [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 2,814,059 | 3,469,194
Total | 2,814,059 | 3,469,194
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 12,735
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 4,050
Commercial [Member] | Energy [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 10,571 | 41,414
Commercial [Member] | Energy [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,803,488 | 3,410,995
Commercial [Member] | Healthcare [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 3,347,641 | 3,305,990
Total | 3,347,641 | 3,305,990
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 404 | 0
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 497 | 3,645
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,346,740 | 3,302,345
Commercial [Member] | Services [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 326
Current and Past Due Performing Loans | 3,323,422 | 3,508,583
Total | 3,323,422 | 3,508,583
Commercial [Member] | Services [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,092 | 3,278
Commercial [Member] | Services [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,648 | 177
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 9,024 | 15,705
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,309,658 | 3,489,423
Commercial [Member] | General business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 200 | 4,495
Current and Past Due Performing Loans | 2,690,018 | 2,793,768
Total | 2,690,018 | 2,793,768
Commercial [Member] | General business [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,732 | 1,206
Commercial [Member] | General business [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,821 | 6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 7,587 | 10,247
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,678,878 | 2,776,038
Commercial real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 5,126
Current and Past Due Performing Loans | 4,116,892 | 4,698,538
Total | 4,116,892 | 4,698,538
Commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,505 | 276
Commercial real estate [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 5,310
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 9,596 | 20,673
Commercial real estate [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,105,791 | 4,672,279
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 536,052 | 1,682,310
Total | 536,052 | 1,682,310
Paycheck Protection Program [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Paycheck Protection Program [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Paycheck Protection Program [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Paycheck Protection Program [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 536,052 | 1,682,310
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 111,858 | 78,771
Current and Past Due Performing Loans | 3,519,852 | 3,549,137
Total | 3,519,852 | 3,549,137
Loans to individuals [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 42,115 | 50,518
Loans to individuals [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 20,334 | 22,968
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 125,115 | 90,543
Loans to individuals [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,332,288 | 3,385,108
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 23 | 181
Current and Past Due Performing Loans | 1,747,243 | 1,863,003
Total | 1,747,243 | 1,863,003
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 6,147 | 5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,269 | 837
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 6,885 | 7,050
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,731,942 | 1,849,304
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 111,835 | 78,349
Current and Past Due Performing Loans | 376,986 | 408,687
Total | 376,986 | 408,687
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 35,894 | 41,389
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 18,028 | 22,041
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 118,163 | 83,155
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 204,901 | 262,102
Loans to individuals [Member] | Personal [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 241
Current and Past Due Performing Loans | 1,395,623 | 1,277,447
Total | 1,395,623 | 1,277,447
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 74 | 3,317
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 37 | 90
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 67 | 338
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | $ 1,395,445 | $ 1,273,702

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