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Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | $ 134,059 | $ 234,693
Financing Receivable, Nonaccrual, No Allowance | 114,025 | 167,878
Financing receivable, Nonaccrual, With Allowance | 20,034 | 66,815
Financing Receivable, Nonaccrual, Related Allowance | 6,343 | 22,441
Commercial [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 74,104 | 167,159
Financing Receivable, Nonaccrual, No Allowance | 62,146 | 113,945
Financing receivable, Nonaccrual, With Allowance | 11,958 | 53,214
Financing Receivable, Nonaccrual, Related Allowance | 3,994 | 19,052
Commercial [Member] | Energy [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 31,091 | 125,059
Financing Receivable, Nonaccrual, No Allowance | 31,091 | 76,633
Financing receivable, Nonaccrual, With Allowance | 0 | 48,426
Financing Receivable, Nonaccrual, Related Allowance | 0 | 16,478
Commercial [Member] | Healthcare [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 15,762 | 3,645
Financing Receivable, Nonaccrual, No Allowance | 9,679 | 3,645
Financing receivable, Nonaccrual, With Allowance | 6,083 | 0
Financing Receivable, Nonaccrual, Related Allowance | 53 | 0
Commercial [Member] | Services [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 17,170 | 25,598
Financing Receivable, Nonaccrual, No Allowance | 13,686 | 20,810
Financing receivable, Nonaccrual, With Allowance | 3,484 | 4,788
Financing Receivable, Nonaccrual, Related Allowance | 2,584 | 2,574
Commercial [Member] | General business [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 10,081 | 12,857
Financing Receivable, Nonaccrual, No Allowance | 7,690 | 12,857
Financing receivable, Nonaccrual, With Allowance | 2,391 | 0
Financing Receivable, Nonaccrual, Related Allowance | 1,357 | 0
Commercial real estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 14,262 | 27,246
Financing Receivable, Nonaccrual, No Allowance | 6,186 | 13,645
Financing receivable, Nonaccrual, With Allowance | 8,076 | 13,601
Financing Receivable, Nonaccrual, Related Allowance | 2,349 | 3,389
Loans to individuals [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 45,693 | 40,288
Financing Receivable, Nonaccrual, No Allowance | 45,693 | 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 | 31,574 | 32,228
Financing Receivable, Nonaccrual, No Allowance | 31,574 | 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 | 258 | 319
Financing Receivable, Nonaccrual, No Allowance | 258 | 319
Financing receivable, Nonaccrual, With Allowance | 0 | 0
Financing Receivable, Nonaccrual, Related Allowance | 0 | 0
US Government Agency Insured Loans | Loans to individuals [Member] | Residential mortgage [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 13,861 | 7,741
Financing Receivable, Nonaccrual, No Allowance | 13,861 | 7,741
Financing receivable, Nonaccrual, With Allowance | 0 | 0
Financing Receivable, Nonaccrual, Related Allowance | $ 0 | $ 0

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