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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | $ 119,132 | $ 88,718
Current and Past Due Performing Loans | 20,205,680 | 23,007,520
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 43,102 | 68,013
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 27,870 | 38,782
90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 153,861 | 182,227
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 19,980,847 | 22,718,498
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 199 | 4,821
Current and Past Due Performing Loans | 12,506,465 | 13,077,535
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 9,904 | 17,219
Commercial [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 9,333 | 10,504
Commercial [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 14,298 | 71,011
Commercial [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 12,472,930 | 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 | 3,006,884 | 3,469,194
Commercial [Member] | Energy [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 545 | 12,735
Commercial [Member] | Energy [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,716 | 4,050
Commercial [Member] | Energy [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 41,414
Commercial [Member] | Energy [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,002,623 | 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 | 3,414,940 | 3,305,990
Commercial [Member] | Healthcare [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,359 | 0
Commercial [Member] | Healthcare [Member] | 60 to 89 Days Past Due [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 | 509 | 3,645
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,412,072 | 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 | 3,367,193 | 3,508,583
Commercial [Member] | Services [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 920 | 3,278
Commercial [Member] | Services [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,620 | 177
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 9,014 | 15,705
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,352,639 | 3,489,423
Commercial [Member] | General business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 199 | 4,495
Current and Past Due Performing Loans | 2,717,448 | 2,793,768
Commercial [Member] | General business [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 6,080 | 1,206
Commercial [Member] | General business [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 997 | 6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,775 | 10,247
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,705,596 | 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 | 3,831,325 | 4,698,538
Commercial real estate [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 276
Commercial real estate [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 206 | 5,310
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,157 | 20,673
Commercial real estate [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,827,962 | 4,672,279
Paycheck Protection Program |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 74 | 0
Current and Past Due Performing Loans | 276,341 | 1,682,310
Paycheck Protection Program | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Paycheck Protection Program | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Paycheck Protection Program | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Paycheck Protection Program | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 276,341 | 1,682,310
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 118,859 | 78,771
Current and Past Due Performing Loans | 3,591,549 | 3,549,137
Loans to individuals [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 33,198 | 50,518
Loans to individuals [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 18,331 | 22,968
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 136,406 | 90,543
Loans to individuals [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,403,614 | 3,385,108
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 181
Current and Past Due Performing Loans | 1,722,170 | 1,863,003
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 6,263 | 5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,556 | 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 | 6,697 | 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 | 1,707,654 | 1,849,304
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 118,819 | 78,349
Current and Past Due Performing Loans | 354,173 | 408,687
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 26,869 | 41,389
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 16,751 | 22,041
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 129,531 | 83,155
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 181,022 | 262,102
Loans to individuals [Member] | Personal [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 40 | 241
Current and Past Due Performing Loans | 1,515,206 | 1,277,447
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 66 | 3,317
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 24 | 90
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 178 | 338
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | $ 1,514,938 | $ 1,273,702

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