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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual $ 132,251 $ 121,797
Financing Receivable, Nonaccrual, No Allowance 113,625 90,854
Financing Receivable, Nonaccrual, With Allowance 18,626 30,943
Financing Receivable, Nonaccrual, Related Allowance 9,366 5,570
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 73,277 60,297
Financing Receivable, Nonaccrual, No Allowance 64,542 45,531
Financing Receivable, Nonaccrual, With Allowance 8,735 14,766
Financing Receivable, Nonaccrual, Related Allowance 7,816 4,020
Commercial [Member] | Energy [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 20,037 1,399
Financing Receivable, Nonaccrual, No Allowance 20,037 1,399
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 36,753 41,034
Financing Receivable, Nonaccrual, No Allowance 36,753 34,661
Financing Receivable, Nonaccrual, With Allowance 0 6,373
Financing Receivable, Nonaccrual, Related Allowance 0 946
Commercial [Member] | Services [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 4,541 16,228
Financing Receivable, Nonaccrual, No Allowance 404 7,835
Financing Receivable, Nonaccrual, With Allowance 4,137 8,393
Financing Receivable, Nonaccrual, Related Allowance 3,218 3,074
Commercial [Member] | General business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 11,946 1,636
Financing Receivable, Nonaccrual, No Allowance 7,348 1,636
Financing Receivable, Nonaccrual, With Allowance 4,598 0
Financing Receivable, Nonaccrual, Related Allowance 4,598 0
Commercial real estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 17,395 16,570
Financing Receivable, Nonaccrual, No Allowance 7,504 393
Financing Receivable, Nonaccrual, With Allowance 9,891 16,177
Financing Receivable, Nonaccrual, Related Allowance 1,550 1,550
Loans to individuals [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 41,579 44,930
Financing Receivable, Nonaccrual, No Allowance 41,579 44,930
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 29,973 29,791
Financing Receivable, Nonaccrual, No Allowance 29,973 29,791
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 133 134
Financing Receivable, Nonaccrual, No Allowance 133 134
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
US Government Agency Insured Loans [Member] | Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 11,473 15,005
Financing Receivable, Nonaccrual, No Allowance 11,473 15,005
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance $ 0 $ 0