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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
Impaired loans, recorded investment, total | 197,794
Impaired loans, recorded investment with no related allowance | 197,794
Impaired loans, recorded investment with related allowance | 0
Impaired loans, related allowance | 0
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

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