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Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | $ 415,920 | $ 423,787
Impaired loans, recorded investment, total | 338,939 | 346,981
Impaired loans, recorded investment with no related allowance | 330,891 | 311,526
Impaired loans, recorded investment with related allowance | 8,048 | 35,455
Impaired loans, related allowance | 3,543 | 8,732
Impaired loans, average recorded investment | 346,225 |
Impaired loans, interest income recognized | 2,203 |
Commercial [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 153,786 | 156,163
Impaired loans, recorded investment, total | 90,358 | 99,841
Impaired loans, recorded investment with no related allowance | 82,310 | 64,386
Impaired loans, recorded investment with related allowance | 8,048 | 35,455
Impaired loans, related allowance | 3,543 | 8,732
Impaired loans, average recorded investment | 94,044 |
Impaired loans, interest income recognized | 0 |
Commercial [Member] | Energy [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 72,615 | 79,675
Impaired loans, recorded investment, total | 35,332 | 47,494
Impaired loans, recorded investment with no related allowance | 31,332 | 18,639
Impaired loans, recorded investment with related allowance | 4,000 | 28,855
Impaired loans, related allowance | 675 | 5,362
Impaired loans, average recorded investment | 45,627 |
Impaired loans, interest income recognized | 0 |
Commercial [Member] | Services [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 13,744 | 13,437
Impaired loans, recorded investment, total | 9,555 | 8,567
Impaired loans, recorded investment with no related allowance | 9,529 | 8,489
Impaired loans, recorded investment with related allowance | 26 | 78
Impaired loans, related allowance | 26 | 74
Impaired loans, average recorded investment | 7,378 |
Impaired loans, interest income recognized | 0 |
Commercial [Member] | Wholesale/retail [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 1,642 | 1,722
Impaired loans, recorded investment, total | 1,425 | 1,316
Impaired loans, recorded investment with no related allowance | 1,142 | 1,015
Impaired loans, recorded investment with related allowance | 283 | 301
Impaired loans, related allowance | 101 | 101
Impaired loans, average recorded investment | 1,047 |
Impaired loans, interest income recognized | 0 |
Commercial [Member] | Manufacturing [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 9,697 | 10,055
Impaired loans, recorded investment, total | 9,548 | 8,919
Impaired loans, recorded investment with no related allowance | 9,307 | 8,673
Impaired loans, recorded investment with related allowance | 241 | 246
Impaired loans, related allowance | 241 | 246
Impaired loans, average recorded investment | 8,851 |
Impaired loans, interest income recognized | 0 |
Impaired loans, unpaid principal balance to affiliates | 4,700 |
Commercial [Member] | Healthcare [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 30,189 | 24,319
Impaired loans, recorded investment, total | 18,768 | 16,538
Impaired loans, recorded investment with no related allowance | 15,270 | 10,563
Impaired loans, recorded investment with related allowance | 3,498 | 5,975
Impaired loans, related allowance | 2,500 | 2,949
Impaired loans, average recorded investment | 14,926 |
Impaired loans, interest income recognized | 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 |
Commercial [Member] | Other commercial and industrial [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 25,899 | 26,955
Impaired loans, recorded investment, total | 15,730 | 17,007
Impaired loans, recorded investment with no related allowance | 15,730 | 17,007
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 16,215 |
Impaired loans, interest income recognized | 0 |
Commercial real estate [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 22,957 | 30,138
Impaired loans, recorded investment, total | 21,508 | 21,621
Impaired loans, recorded investment with no related allowance | 21,508 | 21,621
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 21,565 |
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 | 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 |
Impaired loans, interest income recognized | 0 |
Commercial real estate [Member] | Retail [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 20,491 | 27,680
Impaired loans, recorded investment, total | 20,159 | 20,279
Impaired loans, recorded investment with no related allowance | 20,159 | 20,279
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 20,219 |
Impaired loans, interest income recognized | 0 |
Commercial real estate [Member] | Office [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 855 | 0
Impaired loans, recorded investment, total | 855 | 0
Impaired loans, recorded investment with no related allowance | 855 | 0
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 427 |
Impaired loans, interest income recognized | 0 |
Commercial real estate [Member] | Multifamily [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 0 | 301
Impaired loans, recorded investment, total | 0 | 301
Impaired loans, recorded investment with no related allowance | 0 | 301
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 151 |
Impaired loans, interest income recognized | 0 |
Commercial real estate [Member] | Industrial [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 |
Impaired loans, interest income recognized | 0 |
Commercial real estate [Member] | Other commercial real estate [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 305 | 851
Impaired loans, recorded investment, total | 144 | 691
Impaired loans, recorded investment with no related allowance | 144 | 691
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 418 |
Impaired loans, interest income recognized | 0 |
Residential mortgage [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 238,819 | 237,208
Impaired loans, recorded investment, total | 226,771 | 225,289
Impaired loans, recorded investment with no related allowance | 226,771 | 225,289
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 230,350 |
Impaired loans, interest income recognized | 2,203 |
Residential mortgage [Member] | Permanent mortgage [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 27,658 | 28,716
Impaired loans, recorded investment, total | 22,937 | 23,951
Impaired loans, recorded investment with no related allowance | 22,937 | 23,951
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 23,444 |
Impaired loans, interest income recognized | 298 |
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 198,882 | 196,296
Impaired loans, recorded investment, total | 193,308 | 190,866
Impaired loans, recorded investment with no related allowance | 193,308 | 190,866
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 196,407 |
Impaired loans, interest income recognized | 1,905 |
Residential mortgage [Member] | Home equity [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 12,279 | 12,196
Impaired loans, recorded investment, total | 10,526 | 10,472
Impaired loans, recorded investment with no related allowance | 10,526 | 10,472
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | 0
Impaired loans, average recorded investment | 10,499 |
Impaired loans, interest income recognized | 0 |
Personal [Member] |  |
Impaired loans [Abstract] |  |
Impaired loans, unpaid principal balance | 358 | 278
Impaired loans, recorded investment, total | 302 | 230
Impaired loans, recorded investment with no related allowance | 302 | 230
Impaired loans, recorded investment with related allowance | 0 | 0
Impaired loans, related allowance | 0 | $ 0
Impaired loans, average recorded investment | 266 |
Impaired loans, interest income recognized | $ 0 |

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