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Loans and Allowances for Credit Losses, Impaired Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
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 |
Impaired loans, average recorded investment | 354,262 |
Impaired loans, interest income recognized | 8,931 |
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 |
Impaired loans, average recorded investment | 101,399 |
Impaired loans, interest income recognized | 0 |
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 |
Impaired loans, average recorded investment | 69,119 |
Impaired loans, interest income recognized | 0 |
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 |
Impaired loans, average recorded investment | 5,854 |
Impaired loans, interest income recognized | 0 |
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 |
Impaired loans, average recorded investment | 916 |
Impaired loans, interest income recognized | 0 |
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 |
Impaired loans, average recorded investment | 9,144 |
Impaired loans, interest income recognized | 0 |
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 |
Impaired loans, average recorded investment | 7,798 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 0 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 8,568 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 24,623 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 350 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 19,573 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 0 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 3,580 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 454 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 666 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 22,196 |
Impaired loans, interest income recognized | 1,198 |
Loans to individuals [Member] | Permanent residential mortgage [Member] | US Government Agency Insured Loans |  |
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]
Impaired loans, average recorded investment | 195,009 | [1]
Impaired loans, interest income recognized | 7,733 | [1]
Loans to individuals [Member] | Home Equity Loan |  |
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 |
Impaired loans, average recorded investment | 10,776 |
Impaired loans, interest income recognized | 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 |
Impaired loans, average recorded investment | 227,981 |
Impaired loans, interest income recognized | 8,931 |
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 |
Impaired loans, average recorded investment | 259 |
Impaired loans, interest income recognized | $ 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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