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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | $ 87,473 | $ 119,132
Current and Past Due Performing Loans | 21,291,148 | 20,205,680
30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 50,069 | 43,102
60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 25,005 | 27,870
90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 123,397 | 153,861
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 21,092,677 | 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 | 13,578,697 | 12,506,465
Commercial [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,865 | 9,904
Commercial [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,444 | 9,333
Commercial [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 14,598 | 14,298
Commercial [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 13,559,790 | 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 | 3,393,072 | 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 | 3,393,072 | 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 | 3,696,963 | 3,414,940
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,178 | 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 | 6,529 | 509
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,688,256 | 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 | 3,421,493 | 3,367,193
Commercial [Member] | Services [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 198 | 920
Commercial [Member] | Services [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 4,620
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 8,069 | 9,014
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,413,226 | 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 | 3,067,169 | 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 | 489 | 6,080
Commercial [Member] | General business [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,444 | 997
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 4,775
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,065,236 | 2,705,596
Commercial real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 4,106,148 | 3,831,325
Commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 28 | 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 | 3,200 | 3,157
Commercial real estate [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,102,920 | 3,827,962
Paycheck Protection Program [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 3 | 74
Current and Past Due Performing Loans | 43,140 | 276,341
Paycheck Protection Program [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 27 | 0
Paycheck Protection Program [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 459 | 0
Paycheck Protection Program [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3 | 0
Paycheck Protection Program [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 42,651 | 276,341
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 87,470 | 118,859
Current and Past Due Performing Loans | 3,563,163 | 3,591,549
Loans to individuals [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 47,149 | 33,198
Loans to individuals [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23,102 | 18,331
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 105,596 | 136,406
Loans to individuals [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,387,316 | 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 | 1,784,729 | 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 | 10,904 | 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 | 1,828 | 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 | 5,643 | 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 | 1,766,354 | 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 | 87,470 | 118,819
Current and Past Due Performing Loans | 293,838 | 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 | 35,574 | 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 | 19,659 | 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 | 99,930 | 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 | 138,675 | 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 | 1,484,596 | 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 | 671 | 66
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,615 | 24
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23 | 178
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | $ 1,482,287 | $ 1,514,938

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