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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | $ 45,740 | $ 48,371
Current and Past Due Performing Loans | 23,985,061 | 23,904,968
30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 40,760 | 55,411
60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 31,490 | 50,082
90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 80,267 | 93,644
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23,832,544 | 23,705,831
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 14,877,922 | 14,803,769
Commercial [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 12,726 | 18,433
Commercial [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 17,601 | 31,447
Commercial [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 15,876 | 29,890
Commercial [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 14,831,719 | 14,723,999
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 | 4,149,069 | 4,143,233
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 18,019
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 211 | 30,290
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 9,988 | 23,588
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,138,870 | 4,071,336
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 | 3,573,670 | 3,576,223
Commercial [Member] | Services [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,002 | 2
Commercial [Member] | Services [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 658 | 434
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,572,010 | 3,575,787
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 | 3,126,635 | 3,437,101
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 11,526 | 0
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 17,390 | 0
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 | 3,097,719 | 3,437,101
Commercial [Member] | General business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 0
Current and Past Due Performing Loans | 4,028,548 | 3,647,212
Commercial [Member] | General business [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 198 | 412
Commercial [Member] | General business [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 1,157
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,230 | 5,868
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,023,120 | 3,639,775
Commercial real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 3
Current and Past Due Performing Loans | 5,188,655 | 5,337,647
Commercial real estate [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 2,992
Commercial real estate [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 0
Commercial real estate [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 12,238 | 7,174
Commercial real estate [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,176,417 | 5,327,481
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 45,740 | 48,368
Current and Past Due Performing Loans | 3,918,484 | 3,763,552
Loans to individuals [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 28,034 | 33,986
Loans to individuals [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 13,889 | 18,635
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 52,153 | 56,580
Loans to individuals [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,824,408 | 3,654,351
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 597 | 36
Current and Past Due Performing Loans | 2,370,293 | 2,160,640
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 6,756 | 6,340
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,812 | 1,494
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,322 | 2,879
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,359,403 | 2,149,927
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 | 45,143 | 48,201
Current and Past Due Performing Loans | 127,747 | 149,807
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 | 20,956 | 25,085
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 | 12,050 | 17,053
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 | 49,808 | 53,547
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 | 44,933 | 54,122
Loans to individuals [Member] | Personal [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 131
Current and Past Due Performing Loans | 1,420,444 | 1,453,105
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 322 | 2,561
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 27 | 88
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23 | 154
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | $ 1,420,072 | $ 1,450,302

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