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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | $ 163,172 | $ 180,951
Financing Receivable, Nonaccrual, No Allowance | 105,712 |
Financing Receivable, Nonaccrual, With Allowance | 57,460 |
Financing Receivable, Nonaccrual, Related Allowance | 9,884 |
Commercial [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 118,624 | 115,416
Financing Receivable, Nonaccrual, No Allowance | 61,164 |
Financing Receivable, Nonaccrual, With Allowance | 57,460 |
Financing Receivable, Nonaccrual, Related Allowance | 9,884 |
Commercial [Member] | Energy [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 96,448 | 91,722
Financing Receivable, Nonaccrual, No Allowance | 40,424 |
Financing Receivable, Nonaccrual, With Allowance | 56,024 |
Financing Receivable, Nonaccrual, Related Allowance | 9,375 |
Commercial [Member] | Healthcare [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 4,070 | 4,480
Financing Receivable, Nonaccrual, No Allowance | 4,070 |
Financing Receivable, Nonaccrual, With Allowance | 0 |
Financing Receivable, Nonaccrual, Related Allowance | 0 |
Commercial [Member] | Services [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 8,425 | 7,483
Financing Receivable, Nonaccrual, No Allowance | 7,258 |
Financing Receivable, Nonaccrual, With Allowance | 1,167 |
Financing Receivable, Nonaccrual, Related Allowance | 240 |
Commercial [Member] | General business [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 9,681 |
Financing Receivable, Nonaccrual, No Allowance | 9,412 |
Financing Receivable, Nonaccrual, With Allowance | 269 |
Financing Receivable, Nonaccrual, Related Allowance | 269 |
Commercial real estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 8,545 | 27,626
Financing Receivable, Nonaccrual, No Allowance | 8,545 |
Financing Receivable, Nonaccrual, With Allowance | 0 |
Financing Receivable, Nonaccrual, Related Allowance | 0 |
Loans to individuals [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 36,003 | 37,622
Financing Receivable, Nonaccrual, No Allowance | 36,003 |
Financing Receivable, Nonaccrual, With Allowance | 0 |
Financing Receivable, Nonaccrual, Related Allowance | 0 |
Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 30,721 |
Financing Receivable, Nonaccrual, No Allowance | 30,721 |
Financing Receivable, Nonaccrual, With Allowance | 0 |
Financing Receivable, Nonaccrual, Related Allowance | 0 |
Loans to individuals [Member] | Personal [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 277 | $ 287
Financing Receivable, Nonaccrual, No Allowance | 277 |
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] |  |
Nonaccrual | 5,005 |
Financing Receivable, Nonaccrual, No Allowance | 5,005 |
Financing Receivable, Nonaccrual, With Allowance | 0 |
Financing Receivable, Nonaccrual, Related Allowance | $ 0 |

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