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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | $ 141,947 | $ 234,693
Financing Receivable, Nonaccrual, No Allowance | 118,574 | 167,878
Financing Receivable, Nonaccrual, With Allowance | 23,373 | 66,815
Financing Receivable, Nonaccrual, Related Allowance | 10,184 | 22,441
Commercial [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 80,674 | 167,159
Financing Receivable, Nonaccrual, No Allowance | 65,545 | 113,945
Financing Receivable, Nonaccrual, With Allowance | 15,129 | 53,214
Financing Receivable, Nonaccrual, Related Allowance | 7,835 | 19,052
Commercial [Member] | Energy [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 45,500 | 125,059
Financing Receivable, Nonaccrual, No Allowance | 40,998 | 76,633
Financing Receivable, Nonaccrual, With Allowance | 4,502 | 48,426
Financing Receivable, Nonaccrual, Related Allowance | 2,417 | 16,478
Commercial [Member] | Healthcare [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 509 | 3,645
Financing Receivable, Nonaccrual, No Allowance | 509 | 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 | 25,714 | 25,598
Financing Receivable, Nonaccrual, No Allowance | 18,512 | 20,810
Financing Receivable, Nonaccrual, With Allowance | 7,202 | 4,788
Financing Receivable, Nonaccrual, Related Allowance | 4,918 | 2,574
Commercial [Member] | General business [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 8,951 | 12,857
Financing Receivable, Nonaccrual, No Allowance | 5,526 | 12,857
Financing Receivable, Nonaccrual, With Allowance | 3,425 | 0
Financing Receivable, Nonaccrual, Related Allowance | 500 | 0
Commercial real estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 21,223 | 27,246
Financing Receivable, Nonaccrual, No Allowance | 12,979 | 13,645
Financing Receivable, Nonaccrual, With Allowance | 8,244 | 13,601
Financing Receivable, Nonaccrual, Related Allowance | 2,349 | 3,389
Loans to individuals [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 40,050 | 40,288
Financing Receivable, Nonaccrual, No Allowance | 40,050 | 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 | 30,674 | 32,228
Financing Receivable, Nonaccrual, No Allowance | 30,674 | 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 | 188 | 319
Financing Receivable, Nonaccrual, No Allowance | 188 | 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 | 9,188 | 7,741
Financing Receivable, Nonaccrual, No Allowance | 9,188 | 7,741
Financing Receivable, Nonaccrual, With Allowance | 0 | 0
Financing Receivable, Nonaccrual, Related Allowance | $ 0 | $ 0

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