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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 |

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