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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual $ 221,153 $ 180,951
Financing Receivable, Nonaccrual, No Allowance 169,903  
Financing Receivable, Nonaccrual, With Allowance 51,250  
Financing Receivable, Nonaccrual, Related Allowance 19,695  
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 169,953 115,416
Financing Receivable, Nonaccrual, No Allowance 124,071  
Financing Receivable, Nonaccrual, With Allowance 45,882  
Financing Receivable, Nonaccrual, Related Allowance 19,155  
Commercial [Member] | Energy [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 126,816 91,722
Financing Receivable, Nonaccrual, No Allowance 86,793  
Financing Receivable, Nonaccrual, With Allowance 40,023  
Financing Receivable, Nonaccrual, Related Allowance 16,504  
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 3,645 4,480
Financing Receivable, Nonaccrual, No Allowance 3,645  
Financing Receivable, Nonaccrual, With Allowance 0  
Financing Receivable, Nonaccrual, Related Allowance 0  
Commercial [Member] | Services [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 25,817 7,483
Financing Receivable, Nonaccrual, No Allowance 20,456  
Financing Receivable, Nonaccrual, With Allowance 5,361  
Financing Receivable, Nonaccrual, Related Allowance 2,574  
Commercial [Member] | General business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 13,675  
Financing Receivable, Nonaccrual, No Allowance 13,177  
Financing Receivable, Nonaccrual, With Allowance 498  
Financing Receivable, Nonaccrual, Related Allowance 77  
Commercial real estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 12,952 27,626
Financing Receivable, Nonaccrual, No Allowance 7,584  
Financing Receivable, Nonaccrual, With Allowance 5,368  
Financing Receivable, Nonaccrual, Related Allowance 540  
Loans to individuals [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 38,248 37,622
Financing Receivable, Nonaccrual, No Allowance 38,248  
Financing Receivable, Nonaccrual, With Allowance 0  
Financing Receivable, Nonaccrual, Related Allowance 0  
Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 31,599  
Financing Receivable, Nonaccrual, No Allowance 31,599  
Financing Receivable, Nonaccrual, With Allowance 0  
Financing Receivable, Nonaccrual, Related Allowance 0  
Loans to individuals [Member] | Personal [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 252 $ 287
Financing Receivable, Nonaccrual, No Allowance 252  
Financing Receivable, Nonaccrual, With Allowance 0  
Financing Receivable, Nonaccrual, Related Allowance 0  
US Government Agency Insured Loans [Member] | Loans to individuals [Member] | Residential mortgage [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 6,397  
Financing Receivable, Nonaccrual, No Allowance 6,397  
Financing Receivable, Nonaccrual, With Allowance 0  
Financing Receivable, Nonaccrual, Related Allowance $ 0