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Loans and Allowances for Credit Losses Loans and Allowances for Credit Losses, Nonaccrual (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | $ 124,246 | $ 134,059
Financing Receivable, Nonaccrual, No Allowance | 106,551 | 114,025
Financing Receivable, Nonaccrual, With Allowance | 17,695 | 20,034
Financing Receivable, Nonaccrual, Related Allowance | 3,288 | 6,343
Commercial [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 60,337 | 74,104
Financing Receivable, Nonaccrual, No Allowance | 50,550 | 62,146
Financing Receivable, Nonaccrual, With Allowance | 9,787 | 11,958
Financing Receivable, Nonaccrual, Related Allowance | 2,353 | 3,994
Commercial [Member] | Energy [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 24,976 | 31,091
Financing Receivable, Nonaccrual, No Allowance | 24,976 | 31,091
Financing Receivable, Nonaccrual, With Allowance | 0 | 0
Financing Receivable, Nonaccrual, Related Allowance | 0 | 0
Commercial [Member] | Healthcare [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 15,076 | 15,762
Financing Receivable, Nonaccrual, No Allowance | 8,534 | 9,679
Financing Receivable, Nonaccrual, With Allowance | 6,542 | 6,083
Financing Receivable, Nonaccrual, Related Allowance | 946 | 53
Commercial [Member] | Services [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 16,535 | 17,170
Financing Receivable, Nonaccrual, No Allowance | 13,290 | 13,686
Financing Receivable, Nonaccrual, With Allowance | 3,245 | 3,484
Financing Receivable, Nonaccrual, Related Allowance | 1,407 | 2,584
Commercial [Member] | General business [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 3,750 | 10,081
Financing Receivable, Nonaccrual, No Allowance | 3,750 | 7,690
Financing Receivable, Nonaccrual, With Allowance | 0 | 2,391
Financing Receivable, Nonaccrual, Related Allowance | 0 | 1,357
Commercial real estate [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 15,989 | 14,262
Financing Receivable, Nonaccrual, No Allowance | 8,081 | 6,186
Financing Receivable, Nonaccrual, With Allowance | 7,908 | 8,076
Financing Receivable, Nonaccrual, Related Allowance | 935 | 2,349
Loans to individuals [Member] |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual | 47,920 | 45,693
Financing Receivable, Nonaccrual, No Allowance | 47,920 | 45,693
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 | 30,757 | 31,574
Financing Receivable, Nonaccrual, No Allowance | 30,757 | 31,574
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 | 171 | 258
Financing Receivable, Nonaccrual, No Allowance | 171 | 258
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 | 16,992 | 13,861
Financing Receivable, Nonaccrual, No Allowance | 16,992 | 13,861
Financing Receivable, Nonaccrual, With Allowance | 0 | 0
Financing Receivable, Nonaccrual, Related Allowance | $ 0 | $ 0

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