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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual $ 216,019 $ 234,693
Financing Receivable, Nonaccrual, No Allowance 144,555 167,878
Financing Receivable, Nonaccrual, With Allowance 71,464 66,815
Financing Receivable, Nonaccrual, Related Allowance 20,051 22,441
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 147,073 167,159
Financing Receivable, Nonaccrual, No Allowance 89,210 113,945
Financing Receivable, Nonaccrual, With Allowance 57,863 53,214
Financing Receivable, Nonaccrual, Related Allowance 16,661 19,052
Commercial [Member] | Energy [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 101,800 125,059
Financing Receivable, Nonaccrual, No Allowance 48,042 76,633
Financing Receivable, Nonaccrual, With Allowance 53,758 48,426
Financing Receivable, Nonaccrual, Related Allowance 13,893 16,478
Commercial [Member] | Healthcare [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 3,187 3,645
Financing Receivable, Nonaccrual, No Allowance 3,187 3,645
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance 0 0
Commercial [Member] | Services [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 28,033 25,598
Financing Receivable, Nonaccrual, No Allowance 24,046 20,810
Financing Receivable, Nonaccrual, With Allowance 3,987 4,788
Financing Receivable, Nonaccrual, Related Allowance 2,650 2,574
Commercial [Member] | General business [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 14,053 12,857
Financing Receivable, Nonaccrual, No Allowance 13,935 12,857
Financing Receivable, Nonaccrual, With Allowance 118 0
Financing Receivable, Nonaccrual, Related Allowance 118 0
Commercial real estate [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 27,243 27,246
Financing Receivable, Nonaccrual, No Allowance 13,642 13,645
Financing Receivable, Nonaccrual, With Allowance 13,601 13,601
Financing Receivable, Nonaccrual, Related Allowance 3,390 3,389
Loans to individuals [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual 41,703 40,288
Financing Receivable, Nonaccrual, No Allowance 41,703 40,288
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 32,884 32,228
Financing Receivable, Nonaccrual, No Allowance 32,884 32,228
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 255 319
Financing Receivable, Nonaccrual, No Allowance 255 319
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 8,564 7,741
Financing Receivable, Nonaccrual, No Allowance 8,564 7,741
Financing Receivable, Nonaccrual, With Allowance 0 0
Financing Receivable, Nonaccrual, Related Allowance $ 0 $ 0