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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Past Due [Line Items]    
Past Due 90 Days or More and Accruing $ 56,002 $ 76,114
Current and Past Due Performing Loans 23,237,659 22,557,150
30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 51,291 55,039
60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 22,334 51,614
90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 105,388 94,633
Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 23,058,646 22,355,864
Commercial [Member]    
Financing Receivable, Past Due [Line Items]    
Past Due 90 Days or More and Accruing 6 396
Current and Past Due Performing Loans 14,534,516 14,212,499
Commercial [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 7,065 7,255
Commercial [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 173 30,365
Commercial [Member] | 90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 32,480 5,813
Commercial [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 14,494,798 14,169,066
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 3,508,752 3,424,790
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 0 24
Commercial [Member] | Energy [Member] | 60 to 89 Days [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] | Energy [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 3,508,752 3,424,766
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 3,991,387 3,845,017
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 0 5,914
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 0 26,480
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 32,070 459
Commercial [Member] | Healthcare [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 3,959,317 3,812,164
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 3,585,169 3,431,521
Commercial [Member] | Services [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 2,172 1,060
Commercial [Member] | Services [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 55 2,461
Commercial [Member] | Services [Member] | 90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 404 4,958
Commercial [Member] | Services [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 3,582,538 3,423,042
Commercial [Member] | General business [Member]    
Financing Receivable, Past Due [Line Items]    
Past Due 90 Days or More and Accruing 6 396
Current and Past Due Performing Loans 3,449,208 3,511,171
Commercial [Member] | General business [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 4,893 257
Commercial [Member] | General business [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 118 1,424
Commercial [Member] | General business [Member] | 90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 6 396
Commercial [Member] | General business [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 3,444,191 3,509,094
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 4,970,801 4,606,777
Commercial real estate [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 0 531
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 7,343 217
Commercial real estate [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 4,963,458 4,606,029
Loans to individuals [Member]    
Financing Receivable, Past Due [Line Items]    
Past Due 90 Days or More and Accruing 55,996 75,718
Current and Past Due Performing Loans 3,732,342 3,737,874
Loans to individuals [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 44,226 47,253
Loans to individuals [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 22,161 21,249
Loans to individuals [Member] | 90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 65,565 88,603
Loans to individuals [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 3,600,390 3,580,769
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Past Due [Line Items]    
Past Due 90 Days or More and Accruing 54 114
Current and Past Due Performing Loans 1,993,690 1,890,784
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 10,537 10,632
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 2,850 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 3,330 6,169
Loans to individuals [Member] | Residential mortgage [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 1,976,973 1,872,155
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 55,782 75,604
Current and Past Due Performing Loans 186,170 245,940
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 30,504 36,119
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 18,302 19,400
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 62,031 82,402
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 75,333 108,019
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Past Due [Line Items]    
Past Due 90 Days or More and Accruing 160 0
Current and Past Due Performing Loans 1,552,482 1,601,150
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 3,185 502
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 1,009 21
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans 204 32
Loans to individuals [Member] | Personal [Member] | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Current and Past Due Performing Loans $ 1,548,084 $ 1,600,595