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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