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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | $ 73,148 | $ 119,132
Current and Past Due Performing Loans | 21,790,457 | 20,205,680
30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 50,576 | 43,102
60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 20,349 | 27,870
90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 103,257 | 153,861
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 21,616,275 | 19,980,847
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 199
Current and Past Due Performing Loans | 13,607,686 | 12,506,465
Commercial [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,946 | 9,904
Commercial [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 701 | 9,333
Commercial [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 16,201 | 14,298
Commercial [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 13,587,838 | 12,472,930
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 | 3,371,588 | 3,006,884
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 545
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 3,716
Commercial [Member] | Energy [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Commercial [Member] | Energy [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,371,588 | 3,002,623
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 | 3,826,623 | 3,414,940
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 524 | 2,359
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 | 14,786 | 509
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,811,313 | 3,412,072
Commercial [Member] | Services [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 3,280,925 | 3,367,193
Commercial [Member] | Services [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,832 | 920
Commercial [Member] | Services [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 154 | 4,620
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,307 | 9,014
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,277,632 | 3,352,639
Commercial [Member] | General business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 199
Current and Past Due Performing Loans | 3,128,550 | 2,717,448
Commercial [Member] | General business [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 590 | 6,080
Commercial [Member] | General business [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 547 | 997
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 108 | 4,775
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,127,305 | 2,705,596
Commercial real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 101 | 0
Current and Past Due Performing Loans | 4,473,911 | 3,831,325
Commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Commercial real estate [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 206
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 318 | 3,157
Commercial real estate [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,473,593 | 3,827,962
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 19 | 74
Current and Past Due Performing Loans | 20,233 | 276,341
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 | 3 | 0
Paycheck Protection Program [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 19 | 0
Paycheck Protection Program [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 20,211 | 276,341
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 73,028 | 118,859
Current and Past Due Performing Loans | 3,688,627 | 3,591,549
Loans to individuals [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 47,630 | 33,198
Loans to individuals [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 19,645 | 18,331
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 86,719 | 136,406
Loans to individuals [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,534,633 | 3,403,614
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 1,851,836 | 1,722,170
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,203 | 6,263
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,397 | 1,556
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,219 | 6,697
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,840,017 | 1,707,654
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 | 73,028 | 118,819
Current and Past Due Performing Loans | 262,466 | 354,173
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 | 40,778 | 26,869
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 | 18,248 | 16,751
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 | 81,474 | 129,531
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 | 121,966 | 181,022
Loans to individuals [Member] | Personal [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 40
Current and Past Due Performing Loans | 1,574,325 | 1,515,206
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,649 | 66
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 24
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 26 | 178
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | $ 1,572,650 | $ 1,514,938

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