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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | $ 48,371 | $ 76,114
Current and Past Due Performing Loans | 23,904,968 | 22,557,150
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23,705,831 | 22,355,864
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 55,411 | 55,039
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 50,082 | 51,614
90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 93,644 | 94,633
Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 396
Current and Past Due Performing Loans | 14,803,769 | 14,212,499
Commercial [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 14,723,999 | 14,169,066
Commercial [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 18,433 | 7,255
Commercial [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 31,447 | 30,365
Commercial [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 29,890 | 5,813
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 | 4,143,233 | 3,845,017
Commercial [Member] | Healthcare [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 4,071,336 | 3,812,164
Commercial [Member] | Healthcare [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 18,019 | 5,914
Commercial [Member] | Healthcare [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 30,290 | 26,480
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 23,588 | 459
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 | 3,576,223 | 3,431,521
Commercial [Member] | Services [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,575,787 | 3,423,042
Commercial [Member] | Services [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2 | 1,060
Commercial [Member] | Services [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 2,461
Commercial [Member] | Services [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 434 | 4,958
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 | 3,437,101 | 3,424,790
Commercial [Member] | Energy [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,437,101 | 3,424,766
Commercial [Member] | Energy [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 24
Commercial [Member] | Energy [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 0 | 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] | General business [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 0 | 396
Current and Past Due Performing Loans | 3,647,212 | 3,511,171
Commercial [Member] | General business [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,639,775 | 3,509,094
Commercial [Member] | General business [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 412 | 257
Commercial [Member] | General business [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,157 | 1,424
Commercial [Member] | General business [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,868 | 396
Commercial real estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 3 | 0
Current and Past Due Performing Loans | 5,337,647 | 4,606,777
Commercial real estate [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 5,327,481 | 4,606,029
Commercial real estate [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,992 | 531
Commercial real estate [Member] | 60 to 89 Days Past Due [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 | 7,174 | 217
Loans to individuals [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 48,368 | 75,718
Current and Past Due Performing Loans | 3,763,552 | 3,737,874
Loans to individuals [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 3,654,351 | 3,580,769
Loans to individuals [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 33,986 | 47,253
Loans to individuals [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 18,635 | 21,249
Loans to individuals [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 56,580 | 88,603
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 36 | 114
Current and Past Due Performing Loans | 2,160,640 | 1,890,784
Loans to individuals [Member] | Residential mortgage [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,149,927 | 1,872,155
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 | 6,340 | 10,632
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 | 1,494 | 1,828
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 2,879 | 6,169
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 | 48,201 | 75,604
Current and Past Due Performing Loans | 149,807 | 245,940
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 54,122 | 108,019
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 | 25,085 | 36,119
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 | 17,053 | 19,400
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 | 53,547 | 82,402
Loans to individuals [Member] | Personal [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due 90 Days or More and Accruing | 131 | 0
Current and Past Due Performing Loans | 1,453,105 | 1,601,150
Loans to individuals [Member] | Personal [Member] | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | 1,450,302 | 1,600,595
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 | 2,561 | 502
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 | 88 | 21
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current and Past Due Performing Loans | $ 154 | $ 32

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