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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual $ 255,396 $ 180,951
Financing Receivable, Nonaccrual, No Allowance 165,285  
Financing Receivable, Nonaccrual, With Allowance 90,111  
Financing Receivable, Nonaccrual, Related Allowance 24,323  
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 201,999 115,416
Financing Receivable, Nonaccrual, No Allowance 117,333  
Financing Receivable, Nonaccrual, With Allowance 84,666  
Financing Receivable, Nonaccrual, Related Allowance 23,783  
Commercial [Member] | Energy [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 162,989 91,722
Financing Receivable, Nonaccrual, No Allowance 85,171  
Financing Receivable, Nonaccrual, With Allowance 77,818  
Financing Receivable, Nonaccrual, Related Allowance 20,863  
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 21,032 7,483
Financing Receivable, Nonaccrual, No Allowance 15,503  
Financing Receivable, Nonaccrual, With Allowance 5,529  
Financing Receivable, Nonaccrual, Related Allowance 2,574  
Commercial [Member] | General business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 14,333  
Financing Receivable, Nonaccrual, No Allowance 13,014  
Financing Receivable, Nonaccrual, With Allowance 1,319  
Financing Receivable, Nonaccrual, Related Allowance 346  
Commercial real estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 13,956 27,626
Financing Receivable, Nonaccrual, No Allowance 8,511  
Financing Receivable, Nonaccrual, With Allowance 5,445  
Financing Receivable, Nonaccrual, Related Allowance 540  
Loans to individuals [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 39,441 37,622
Financing Receivable, Nonaccrual, No Allowance 39,441  
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 33,098  
Financing Receivable, Nonaccrual, No Allowance 33,098  
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 233 $ 287
Financing Receivable, Nonaccrual, No Allowance 233  
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 6,110  
Financing Receivable, Nonaccrual, No Allowance 6,110  
Financing Receivable, Nonaccrual, With Allowance 0  
Financing Receivable, Nonaccrual, Related Allowance $ 0