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Allowance for Loan and Lease Losses (Troubled Debt Restructuring) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loans | Sep. 30, 2017 USD ($) loans | Sep. 30, 2018 USD ($) loans | Sep. 30, 2017 USD ($) loans | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loans | 104 | 115 | 385 | 426 |
Financing Receivable, Modifications, Recorded Investment | $ 161,971 |  | $ 161,971 |  | $ 164,561
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 11,807 | $ 13,180 | $ 37,155 | $ 33,174 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 50 | 67 | 162 | 155 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 3,766 | $ 4,271 | $ 11,472 | $ 10,493 |
PCI Loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 18,369 |  | 18,369 |  | 18,400
Commercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 81,451 |  | 81,451 |  | 95,392
Commercial | Construction and land development |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,350 |  | 2,350 |  | 4,572
Commercial | Mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 67,664 |  | 67,664 |  | 78,221
Commercial | Other commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 929 |  | 929 |  | 1,800
Commercial | Commercial and industrial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 9,319 |  | 9,319 |  | 8,508
Commercial | Lease financing |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 947 |  | 947 |  | 1,770
Commercial | Other |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 242 |  | 242 |  | 521
Noncommercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 80,520 |  | 80,520 |  | 69,169
Noncommercial | Construction and land development |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,824 |  | 2,824 |  | 0
Noncommercial | Mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 46,892 |  | 46,892 |  | 43,542
Noncommercial | Revolving mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 27,917 |  | 27,917 |  | 22,853
Noncommercial | Consumer and Other |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,887 |  | 2,887 |  | 2,774
Accruing |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 130,611 |  | 130,611 |  | 130,391
Accruing | Commercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 66,790 |  | 66,790 |  | 76,300
Accruing | Commercial | Construction and land development |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,020 |  | 2,020 |  | 4,089
Accruing | Commercial | Mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 55,362 |  | 55,362 |  | 62,358
Accruing | Commercial | Other commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 899 |  | 899 |  | 1,012
Accruing | Commercial | Commercial and industrial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 7,762 |  | 7,762 |  | 7,598
Accruing | Commercial | Lease financing |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 628 |  | 628 |  | 722
Accruing | Commercial | Other |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 119 |  | 119 |  | 521
Accruing | Noncommercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 63,821 |  | 63,821 |  | 54,091
Accruing | Noncommercial | Construction and land development |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,673 |  | 2,673 |  | 0
Accruing | Noncommercial | Mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 38,169 |  | 38,169 |  | 34,067
Accruing | Noncommercial | Revolving mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 20,577 |  | 20,577 |  | 17,673
Accruing | Noncommercial | Consumer and Other |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,402 |  | 2,402 |  | 2,351
Nonaccruing |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 31,360 |  | 31,360 |  | 34,170
Nonaccruing | Commercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 14,661 |  | 14,661 |  | 19,092
Nonaccruing | Commercial | Construction and land development |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 330 |  | 330 |  | 483
Nonaccruing | Commercial | Mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 12,302 |  | 12,302 |  | 15,863
Nonaccruing | Commercial | Other commercial real estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 30 |  | 30 |  | 788
Nonaccruing | Commercial | Commercial and industrial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 1,557 |  | 1,557 |  | 910
Nonaccruing | Commercial | Lease financing |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 319 |  | 319 |  | 1,048
Nonaccruing | Commercial | Other |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 123 |  | 123 |  | 0
Nonaccruing | Noncommercial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 16,699 |  | 16,699 |  | 15,078
Nonaccruing | Noncommercial | Construction and land development |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 151 |  | 151 |  | 0
Nonaccruing | Noncommercial | Mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 8,723 |  | 8,723 |  | 9,475
Nonaccruing | Noncommercial | Revolving mortgage |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 7,340 |  | 7,340 |  | 5,180
Nonaccruing | Noncommercial | Consumer and Other |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 485 |  | $ 485 |  | $ 423
Interest only period provided |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loans | 1 | 3 | 3 | 6 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 300 | $ 696 | $ 1,136 | $ 1,180 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 0 | 0 | 2 | 1 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 0 | $ 0 | $ 836 | $ 328 |
Loan term extension |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loans | 9 | 6 | 32 | 31 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 2,565 | $ 156 | $ 4,414 | $ 2,787 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 2 | 0 | 9 | 1 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 327 | $ 0 | $ 943 | $ 31 |
Below market interest rate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loans | 56 | 63 | 211 | 238 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 7,109 | $ 6,859 | $ 24,245 | $ 19,526 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 32 | 27 | 82 | 75 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 2,832 | $ 1,956 | $ 6,098 | $ 5,332 |
Discharged from bankruptcy |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loans | 38 | 43 | 139 | 151 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 1,833 | $ 5,469 | $ 7,360 | $ 9,681 |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 16 | 40 | 69 | 78 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 607 | $ 2,315 | $ 3,595 | $ 4,802 |

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