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Loans and Allowance for Credit Losses, Impaired Loans (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | $ 467,714 |
Impaired loans, recorded investment, total | 372,645 |
Impaired loans, recorded investment with no related allowance | 323,505 |
Impaired loans, recorded investment with related allowance | 49,140 |
Impaired loans, related allowance | 17,414 |
Commercial [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 195,193 |
Impaired loans, recorded investment, total | 115,416 |
Impaired loans, recorded investment with no related allowance | 66,276 |
Impaired loans, recorded investment with related allowance | 49,140 |
Impaired loans, related allowance | 17,414 |
Commercial [Member] | Energy [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 149,441 |
Impaired loans, recorded investment, total | 91,722 |
Impaired loans, recorded investment with no related allowance | 44,244 |
Impaired loans, recorded investment with related allowance | 47,478 |
Impaired loans, related allowance | 16,854 |
Commercial [Member] | Services [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 10,923 |
Impaired loans, recorded investment, total | 7,483 |
Impaired loans, recorded investment with no related allowance | 6,301 |
Impaired loans, recorded investment with related allowance | 1,182 |
Impaired loans, related allowance | 240 |
Commercial [Member] | Wholesale/retail [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 1,980 |
Impaired loans, recorded investment, total | 1,163 |
Impaired loans, recorded investment with no related allowance | 902 |
Impaired loans, recorded investment with related allowance | 261 |
Impaired loans, related allowance | 101 |
Commercial [Member] | Manufacturing [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 10,848 |
Impaired loans, recorded investment, total | 10,133 |
Impaired loans, recorded investment with no related allowance | 9,914 |
Impaired loans, recorded investment with related allowance | 219 |
Impaired loans, related allowance | 219 |
Commercial [Member] | Healthcare [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 13,774 |
Impaired loans, recorded investment, total | 4,480 |
Impaired loans, recorded investment with no related allowance | 4,480 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial [Member] | Public finance [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 0 |
Impaired loans, recorded investment, total | 0 |
Impaired loans, recorded investment with no related allowance | 0 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial [Member] | Other commercial and industrial [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 8,227 |
Impaired loans, recorded investment, total | 435 |
Impaired loans, recorded investment with no related allowance | 435 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 30,139 |
Impaired loans, recorded investment, total | 27,626 |
Impaired loans, recorded investment with no related allowance | 27,626 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] | Residential construction and land development [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 1,306 |
Impaired loans, recorded investment, total | 350 |
Impaired loans, recorded investment with no related allowance | 350 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] | Retail [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 20,265 |
Impaired loans, recorded investment, total | 18,868 |
Impaired loans, recorded investment with no related allowance | 18,868 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] | Office [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 0 |
Impaired loans, recorded investment, total | 0 |
Impaired loans, recorded investment with no related allowance | 0 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] | Multifamily [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 6,858 |
Impaired loans, recorded investment, total | 6,858 |
Impaired loans, recorded investment with no related allowance | 6,858 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] | Industrial [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 909 |
Impaired loans, recorded investment, total | 909 |
Impaired loans, recorded investment with no related allowance | 909 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Commercial real estate [Member] | Other commercial real estate [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 801 |
Impaired loans, recorded investment, total | 641 |
Impaired loans, recorded investment with no related allowance | 641 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Loans to individuals [Member] | Permanent Residential Mortgage [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 24,868 |
Impaired loans, recorded investment, total | 20,441 |
Impaired loans, recorded investment with no related allowance | 20,441 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Loans to individuals [Member] | Permanent Residential Mortgage [Member] | US Government Agency Insured Loans [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 204,187 | [1]
Impaired loans, recorded investment, total | 197,794 | [1]
Impaired loans, recorded investment with no related allowance | 197,794 | [1]
Impaired loans, recorded investment with related allowance | 0 | [1]
Impaired loans, related allowance | 0 | [1]
Loans to individuals [Member] | Home equity [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 12,967 |
Impaired loans, recorded investment, total | 11,081 |
Impaired loans, recorded investment with no related allowance | 11,081 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Loans to individuals [Member] | Residential mortgage [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 242,022 |
Impaired loans, recorded investment, total | 229,316 |
Impaired loans, recorded investment with no related allowance | 229,316 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | 0 |
Loans to individuals [Member] | Personal [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 360 |
Impaired loans, recorded investment, total | 287 |
Impaired loans, recorded investment with no related allowance | 287 |
Impaired loans, recorded investment with related allowance | 0 |
Impaired loans, related allowance | $ 0 |
[1] | All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2019, the majority were accruing based on the guarantee by U.S. government agencies.

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