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Loans and Allowances for Credit Losses, Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | $ 467,714 |  | $ 423,787 |
Impaired loans, recorded investment, total | 372,645 |  | 346,981 |
Impaired loans, recorded investment with no related allowance | 323,505 |  | 311,526 |
Impaired loans, recorded investment with related allowance | 49,140 |  | 35,455 |
Impaired loans, related allowance | 17,414 |  | 8,732 |
Impaired loans, average recorded investment | 354,262 |  | 345,107 |
Impaired loans, interest income recognized | 8,931 |  | 8,405 |
Commercial [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 195,193 |  | 156,163 |
Impaired loans, recorded investment, total | 115,416 |  | 99,841 |
Impaired loans, recorded investment with no related allowance | 66,276 |  | 64,386 |
Impaired loans, recorded investment with related allowance | 49,140 |  | 35,455 |
Impaired loans, related allowance | 17,414 |  | 8,732 |
Impaired loans, average recorded investment | 101,399 |  | 115,460 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Energy [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 149,441 |  | 79,675 |
Impaired loans, recorded investment, total | 91,722 |  | 47,494 |
Impaired loans, recorded investment with no related allowance | 44,244 |  | 18,639 |
Impaired loans, recorded investment with related allowance | 47,478 |  | 28,855 |
Impaired loans, related allowance | 16,854 |  | 5,362 |
Impaired loans, average recorded investment | 69,119 |  | 69,645 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Services [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 10,923 |  | 13,437 |
Impaired loans, recorded investment, total | 7,483 |  | 8,567 |
Impaired loans, recorded investment with no related allowance | 6,301 |  | 8,489 |
Impaired loans, recorded investment with related allowance | 1,182 |  | 78 |
Impaired loans, related allowance | 240 |  | 74 |
Impaired loans, average recorded investment | 5,854 |  | 4,509 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Wholesale/retail [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 1,980 |  | 1,722 |
Impaired loans, recorded investment, total | 1,163 |  | 1,316 |
Impaired loans, recorded investment with no related allowance | 902 |  | 1,015 |
Impaired loans, recorded investment with related allowance | 261 |  | 301 |
Impaired loans, related allowance | 101 |  | 101 |
Impaired loans, average recorded investment | 916 |  | 1,784 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Manufacturing [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 10,848 |  | 10,055 |
Impaired loans, recorded investment, total | 10,133 |  | 8,919 |
Impaired loans, recorded investment with no related allowance | 9,914 |  | 8,673 |
Impaired loans, recorded investment with related allowance | 219 |  | 246 |
Impaired loans, related allowance | 219 |  | 246 |
Impaired loans, average recorded investment | 9,144 |  | 7,249 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Healthcare [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 13,774 |  | 24,319 |
Impaired loans, recorded investment, total | 4,480 |  | 16,538 |
Impaired loans, recorded investment with no related allowance | 4,480 |  | 10,563 |
Impaired loans, recorded investment with related allowance | 0 |  | 5,975 |
Impaired loans, related allowance | 0 |  | 2,949 |
Impaired loans, average recorded investment | 7,798 |  | 14,297 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Public finance [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 0 |  | 0 |
Impaired loans, recorded investment, total | 0 |  | 0 |
Impaired loans, recorded investment with no related allowance | 0 |  | 0 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 0 |  | 0 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial [Member] | Other commercial and industrial [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 8,227 |  | 26,955 |
Impaired loans, recorded investment, total | 435 |  | 17,007 |
Impaired loans, recorded investment with no related allowance | 435 |  | 17,007 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 8,568 |  | 17,976 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 30,139 |  | 30,138 |
Impaired loans, recorded investment, total | 27,626 |  | 21,621 |
Impaired loans, recorded investment with no related allowance | 27,626 |  | 21,621 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 24,623 |  | 12,238 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] | Residential construction and land development [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 1,306 |  | 1,306 |
Impaired loans, recorded investment, total | 350 |  | 350 |
Impaired loans, recorded investment with no related allowance | 350 |  | 350 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 350 |  | 1,091 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] | Retail [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 20,265 |  | 27,680 |
Impaired loans, recorded investment, total | 18,868 |  | 20,279 |
Impaired loans, recorded investment with no related allowance | 18,868 |  | 20,279 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 19,573 |  | 10,278 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] | Office [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 0 |  | 0 |
Impaired loans, recorded investment, total | 0 |  | 0 |
Impaired loans, recorded investment with no related allowance | 0 |  | 0 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 0 |  | 137 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] | Multifamily [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 6,858 |  | 301 |
Impaired loans, recorded investment, total | 6,858 |  | 301 |
Impaired loans, recorded investment with no related allowance | 6,858 |  | 301 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 3,580 |  | 151 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] | Industrial [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 909 |  | 0 |
Impaired loans, recorded investment, total | 909 |  | 0 |
Impaired loans, recorded investment with no related allowance | 909 |  | 0 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 454 |  | 0 |
Impaired loans, interest income recognized | 0 |  | 0 |
Commercial Real Estate [Member] | Other commercial real estate [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 801 |  | 851 |
Impaired loans, recorded investment, total | 641 |  | 691 |
Impaired loans, recorded investment with no related allowance | 641 |  | 691 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 666 |  | 581 |
Impaired loans, interest income recognized | 0 |  | 0 |
Residential Mortgage [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 242,022 |  | 237,208 |
Impaired loans, recorded investment, total | 229,316 |  | 225,289 |
Impaired loans, recorded investment with no related allowance | 229,316 |  | 225,289 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 227,981 |  | 217,159 |
Impaired loans, interest income recognized | 8,931 |  | 8,405 |
Residential Mortgage [Member] | Permanent mortgage [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 24,868 |  | 28,716 |
Impaired loans, recorded investment, total | 20,441 |  | 23,951 |
Impaired loans, recorded investment with no related allowance | 20,441 |  | 23,951 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 22,196 |  | 24,572 |
Impaired loans, interest income recognized | 1,198 |  | 1,233 |
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 204,187 | [1] | 196,296 | [2]
Impaired loans, recorded investment, total | 197,794 | [1] | 190,866 | [2]
Impaired loans, recorded investment with no related allowance | 197,794 | [1] | 190,866 | [2]
Impaired loans, recorded investment with related allowance | 0 | [1] | 0 | [2]
Impaired loans, related allowance | 0 | [1] | 0 | [2]
Impaired loans, average recorded investment | 195,009 | [1] | 180,813 | [2]
Impaired loans, interest income recognized | 7,733 | [1] | 7,172 | [2]
Residential Mortgage [Member] | Home equity [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 12,967 |  | 12,196 |
Impaired loans, recorded investment, total | 11,081 |  | 10,472 |
Impaired loans, recorded investment with no related allowance | 11,081 |  | 10,472 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 10,776 |  | 11,774 |
Impaired loans, interest income recognized | 0 |  | 0 |
Personal [Member] |  |  |  |
Impaired loans [Abstract] |  |  |  |
Impaired loans, unpaid principal balance | 360 |  | 278 |
Impaired loans, recorded investment, total | 287 |  | 230 |
Impaired loans, recorded investment with no related allowance | 287 |  | 230 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |
Impaired loans, average recorded investment | 259 |  | 250 |
Impaired loans, interest income recognized | $ 0 |  | $ 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, $6.1 million of these loans are nonaccruing and $192 million are accruing based on the guarantee by U.S. government agencies.
[2] | 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, 2018, $7.1 million of these loans are nonaccruing and $184 million are accruing based on the guarantee by U.S. government agencies.

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