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Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | $ 389,643 |  | $ 480,181 |  | $ 389,643 |  | $ 480,181 |  | $ 438,459 |
Impaired loans, recorded investment, total | 327,743 |  | 428,116 |  | 327,743 |  | 428,116 |  | 376,201 |
Impaired loans, recorded investment with no related allowance | 267,728 |  | 355,469 |  | 267,728 |  | 355,469 |  | 324,867 |
Impaired loans, recorded investment with related allowance | 60,015 |  | 72,647 |  | 60,015 |  | 72,647 |  | 51,334 |
Impaired loans, related allowance | 15,200 |  | 9,693 |  | 15,200 |  | 9,693 |  | 8,831 |
Impaired loans, average recorded investment | 335,492 |  | 419,893 |  | 349,062 |  | 432,921 |  |  |
Impaired loans, interest income recognized | 1,896 |  | 2,328 |  | 4,050 |  | 4,523 |  |  |
Commercial |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 162,209 |  | 233,643 |  | 162,209 |  | 233,643 |  | 184,604 |
Impaired loans, recorded investment, total | 120,978 |  | 197,157 |  | 120,978 |  | 197,157 |  | 137,303 |
Impaired loans, recorded investment with no related allowance | 60,963 |  | 124,510 |  | 60,963 |  | 124,510 |  | 85,969 |
Impaired loans, recorded investment with related allowance | 60,015 |  | 72,647 |  | 60,015 |  | 72,647 |  | 51,334 |
Impaired loans, related allowance | 15,200 |  | 9,693 |  | 15,200 |  | 9,693 |  | 8,831 |
Impaired loans, average recorded investment | 126,219 |  | 176,992 |  | 129,139 |  | 188,055 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial | Energy [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 84,285 |  | 141,091 |  | 84,285 |  | 141,091 |  | 111,011 |
Impaired loans, recorded investment, total | 65,597 |  | 123,992 |  | 65,597 |  | 123,992 |  | 92,284 |
Impaired loans, recorded investment with no related allowance | 19,735 |  | 56,988 |  | 19,735 |  | 56,988 |  | 40,968 |
Impaired loans, recorded investment with related allowance | 45,862 |  | 67,004 |  | 45,862 |  | 67,004 |  | 51,316 |
Impaired loans, related allowance | 9,460 |  | 8,874 |  | 9,460 |  | 8,874 |  | 8,814 |
Impaired loans, average recorded investment | 77,770 |  | 117,209 |  | 78,940 |  | 128,246 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial | Services [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 7,211 |  | 11,209 |  | 7,211 |  | 11,209 |  | 5,324 |
Impaired loans, recorded investment, total | 4,377 |  | 7,754 |  | 4,377 |  | 7,754 |  | 2,620 |
Impaired loans, recorded investment with no related allowance | 4,296 |  | 7,754 |  | 4,296 |  | 7,754 |  | 2,620 |
Impaired loans, recorded investment with related allowance | 81 |  | 0 |  | 81 |  | 0 |  | 0 |
Impaired loans, related allowance | 79 |  | 0 |  | 79 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 3,243 |  | 7,734 |  | 3,498 |  | 7,964 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial | Wholesale/retail [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 14,523 |  | 17,392 |  | 14,523 |  | 17,392 |  | 9,099 |
Impaired loans, recorded investment, total | 14,095 |  | 10,620 |  | 14,095 |  | 10,620 |  | 2,574 |
Impaired loans, recorded investment with no related allowance | 2,822 |  | 10,620 |  | 2,822 |  | 10,620 |  | 2,574 |
Impaired loans, recorded investment with related allowance | 11,273 |  | 0 |  | 11,273 |  | 0 |  | 0 |
Impaired loans, related allowance | 4,075 |  | 0 |  | 4,075 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 8,329 |  | 10,855 |  | 8,334 |  | 11,013 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial | Manufacturing [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 2,995 |  | 10,223 |  | 2,995 |  | 10,223 |  | 6,073 |
Impaired loans, recorded investment, total | 2,991 |  | 9,656 |  | 2,991 |  | 9,656 |  | 5,962 |
Impaired loans, recorded investment with no related allowance | 2,734 |  | 9,656 |  | 2,734 |  | 9,656 |  | 5,962 |
Impaired loans, recorded investment with related allowance | 257 |  | 0 |  | 257 |  | 0 |  | 0 |
Impaired loans, related allowance | 257 |  | 0 |  | 257 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 2,996 |  | 7,781 |  | 4,476 |  | 7,293 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial | Healthcare [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 26,212 |  | 24,795 |  | 26,212 |  | 24,795 |  | 25,140 |
Impaired loans, recorded investment, total | 16,125 |  | 24,505 |  | 16,125 |  | 24,505 |  | 14,765 |
Impaired loans, recorded investment with no related allowance | 13,583 |  | 18,883 |  | 13,583 |  | 18,883 |  | 14,765 |
Impaired loans, recorded investment with related allowance | 2,542 |  | 5,622 |  | 2,542 |  | 5,622 |  | 0 |
Impaired loans, related allowance | 1,329 |  | 802 |  | 1,329 |  | 802 |  | 0 |
Impaired loans, average recorded investment | 15,734 |  | 12,707 |  | 15,445 |  | 12,665 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial | Other commercial and industrial [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 26,983 |  | 28,933 |  | 26,983 |  | 28,933 |  | 27,957 |
Impaired loans, recorded investment, total | 17,793 |  | 20,630 |  | 17,793 |  | 20,630 |  | 19,098 |
Impaired loans, recorded investment with no related allowance | 17,793 |  | 20,609 |  | 17,793 |  | 20,609 |  | 19,080 |
Impaired loans, recorded investment with related allowance | 0 |  | 21 |  | 0 |  | 21 |  | 18 |
Impaired loans, related allowance | 0 |  | 17 |  | 0 |  | 17 |  | 17 |
Impaired loans, average recorded investment | 18,147 |  | 20,706 |  | 18,446 |  | 20,874 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 10,694 |  | 6,905 |  | 10,694 |  | 6,905 |  | 4,751 |
Impaired loans, recorded investment, total | 1,996 |  | 3,775 |  | 1,996 |  | 3,775 |  | 2,855 |
Impaired loans, recorded investment with no related allowance | 1,996 |  | 3,775 |  | 1,996 |  | 3,775 |  | 2,855 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 2,234 |  | 4,125 |  | 2,425 |  | 4,648 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate | Residential construction and land development [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 1,764 |  | 3,676 |  | 1,764 |  | 3,676 |  | 3,285 |
Impaired loans, recorded investment, total | 350 |  | 2,051 |  | 350 |  | 2,051 |  | 1,832 |
Impaired loans, recorded investment with no related allowance | 350 |  | 2,051 |  | 350 |  | 2,051 |  | 1,832 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 982 |  | 2,334 |  | 1,091 |  | 2,742 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate | Retail [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 8,134 |  | 518 |  | 8,134 |  | 518 |  | 509 |
Impaired loans, recorded investment, total | 1,068 |  | 301 |  | 1,068 |  | 301 |  | 276 |
Impaired loans, recorded investment with no related allowance | 1,068 |  | 301 |  | 1,068 |  | 301 |  | 276 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 666 |  | 308 |  | 672 |  | 314 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate | Office [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 287 |  | 499 |  | 287 |  | 499 |  | 287 |
Impaired loans, recorded investment, total | 275 |  | 396 |  | 275 |  | 396 |  | 275 |
Impaired loans, recorded investment with no related allowance | 275 |  | 396 |  | 275 |  | 396 |  | 275 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 275 |  | 404 |  | 275 |  | 411 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate | Multifamily [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 0 |  | 1,000 |  | 0 |  | 1,000 |  | 0 |
Impaired loans, recorded investment, total | 0 |  | 10 |  | 0 |  | 10 |  | 0 |
Impaired loans, recorded investment with no related allowance | 0 |  | 10 |  | 0 |  | 10 |  | 0 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 0 |  | 17 |  | 0 |  | 24 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, recorded investment, total | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, recorded investment with no related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 0 |  | 38 |  | 0 |  | 38 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Commercial real estate | Other commercial real estate [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 509 |  | 1,212 |  | 509 |  | 1,212 |  | 670 |
Impaired loans, recorded investment, total | 303 |  | 1,017 |  | 303 |  | 1,017 |  | 472 |
Impaired loans, recorded investment with no related allowance | 303 |  | 1,017 |  | 303 |  | 1,017 |  | 472 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 311 |  | 1,024 |  | 387 |  | 1,119 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Residential mortgage |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 216,353 |  | 239,326 |  | 216,353 |  | 239,326 |  | 248,797 |
Impaired loans, recorded investment, total | 204,429 |  | 226,912 |  | 204,429 |  | 226,912 |  | 235,774 |
Impaired loans, recorded investment with no related allowance | 204,429 |  | 226,912 |  | 204,429 |  | 226,912 |  | 235,774 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 206,699 |  | 238,523 |  | 217,193 |  | 239,937 |  |  |
Impaired loans, interest income recognized | 1,896 |  | 2,328 |  | 4,050 |  | 4,523 |  |  |
Residential mortgage | Permanent mortgage [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 28,402 |  | 28,603 |  | 28,402 |  | 28,603 |  | 30,435 |
Impaired loans, recorded investment, total | 23,105 |  | 23,415 |  | 23,105 |  | 23,415 |  | 25,193 |
Impaired loans, recorded investment with no related allowance | 23,105 |  | 23,415 |  | 23,105 |  | 23,415 |  | 25,193 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 23,841 |  | 23,801 |  | 24,149 |  | 23,135 |  |  |
Impaired loans, interest income recognized | 322 |  | 307 |  | 628 |  | 598 |  |  |
Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 174,589 | [1] | 197,659 | [2] | 174,589 | [1] | 197,659 | [2] | 203,814 | [3]
Impaired loans, recorded investment, total | 169,653 | [1] | 191,729 | [2] | 169,653 | [1] | 191,729 | [2] | 197,506 | [3]
Impaired loans, recorded investment with no related allowance | 169,653 | [1] | 191,729 | [2] | 169,653 | [1] | 191,729 | [2] | 197,506 | [3]
Impaired loans, recorded investment with related allowance | 0 | [1] | 0 | [2] | 0 | [1] | 0 | [2] | 0 | [3]
Impaired loans, related allowance | 0 | [1] | 0 | [2] | 0 | [1] | 0 | [2] | 0 | [3]
Impaired loans, average recorded investment | 170,856 | [1] | 202,946 | [2] | 180,671 | [1] | 205,159 | [2] |  |
Impaired loans, interest income recognized | 1,574 | [1] | 2,021 | [2] | 3,422 | [1] | 3,925 | [2] |  |
Residential mortgage | Home equity [Member] |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 13,362 |  | 13,064 |  | 13,362 |  | 13,064 |  | 14,548 |
Impaired loans, recorded investment, total | 11,671 |  | 11,768 |  | 11,671 |  | 11,768 |  | 13,075 |
Impaired loans, recorded investment with no related allowance | 11,671 |  | 11,768 |  | 11,671 |  | 11,768 |  | 13,075 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, average recorded investment | 12,002 |  | 11,776 |  | 12,373 |  | 11,643 |  |  |
Impaired loans, interest income recognized | 0 |  | 0 |  | 0 |  | 0 |  |  |
Personal |  |  |  |  |  |  |  |  |  |
Impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Impaired loans, unpaid principal balance | 387 |  | 307 |  | 387 |  | 307 |  | 307 |
Impaired loans, recorded investment, total | 340 |  | 272 |  | 340 |  | 272 |  | 269 |
Impaired loans, recorded investment with no related allowance | 340 |  | 272 |  | 340 |  | 272 |  | 269 |
Impaired loans, recorded investment with related allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Impaired loans, related allowance | 0 |  | 0 |  | 0 |  | 0 |  | $ 0 |
Impaired loans, average recorded investment | 340 |  | 253 |  | 305 |  | 281 |  |  |
Impaired loans, interest income recognized | $ 0 |  | $ 0 |  | $ 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 June 30, 2018, $7.6 million of these loans were nonaccruing and $162 million were 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 June 30, 2017, $9.1 million of these loans were nonaccruing and $183 million were accruing based on the guarantee by U.S. government agencies.
[3] | 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, 2017, $9.2 million of these loans were nonaccruing and $188 million were accruing based on the guarantee by U.S. government agencies.

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