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Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) loans | Dec. 31, 2017 USD ($) loans
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | $ 156,130 | $ 164,561
Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 74,560 | 95,392
Commercial | Construction and land development |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 2,298 | 4,572
Commercial | Mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 61,065 | 78,221
Commercial | Other commercial real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 860 | 1,800
Commercial | Commercial and industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 10,046 | 10,278
Commercial | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 291 | 521
Noncommercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 81,570 | 69,169
Noncommercial | Construction and land development |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 2,337 | 0
Noncommercial | Mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 47,524 | 43,542
Noncommercial | Revolving mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 28,688 | 22,853
Non-PCI Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | $ 137,910 | $ 146,126
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 164 | 204
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 13,318 | $ 11,990
Financing Receivable, Modifications, Number of Contracts | loans | 491 | 632
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 43,553 | $ 49,000
PCI Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | $ 18,220 | $ 18,435
Principal Forgiveness [Member] | Non-PCI Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 0 | 1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 0 | $ 634
Financing Receivable, Modifications, Number of Contracts | loans | 3 | 6
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 1,003 | $ 1,206
Principal Forgiveness [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 0 | 1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 0 | $ 634
Financing Receivable, Modifications, Number of Contracts | loans | 3 | 5
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 1,003 | $ 1,124
Principal Forgiveness [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 0 | 0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 0 | $ 0
Financing Receivable, Modifications, Number of Contracts | loans | 0 | 1
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 82
Extended Maturity [Member] | Non-PCI Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 8 | 2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 865 | $ 273
Financing Receivable, Modifications, Number of Contracts | loans | 42 | 47
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 5,486 | $ 6,517
Extended Maturity [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 4 | 0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 675 | $ 0
Financing Receivable, Modifications, Number of Contracts | loans | 21 | 13
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 3,933 | $ 3,007
Extended Maturity [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 4 | 2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 190 | $ 273
Financing Receivable, Modifications, Number of Contracts | loans | 21 | 34
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 1,554 | $ 3,510
Interest Rate Below Market Reduction [Member] | Non-PCI Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 92 | 110
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 8,459 | $ 7,983
Financing Receivable, Modifications, Number of Contracts | loans | 269 | 363
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 28,404 | $ 30,412
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 24 | 32
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 2,998 | $ 3,392
Financing Receivable, Modifications, Number of Contracts | loans | 85 | 92
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 12,859 | $ 14,811
Interest Rate Below Market Reduction [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 68 | 78
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 5,461 | $ 4,591
Financing Receivable, Modifications, Number of Contracts | loans | 184 | 271
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 15,545 | $ 15,601
Discharge of Debt [Member] | Non-PCI Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 64 | 91
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 3,994 | $ 3,100
Financing Receivable, Modifications, Number of Contracts | loans | 177 | 216
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 8,660 | $ 10,865
Discharge of Debt [Member] | Non-PCI Loans | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 8 | 26
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 825 | $ 708
Financing Receivable, Modifications, Number of Contracts | loans | 26 | 39
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 2,043 | $ 3,012
Discharge of Debt [Member] | Non-PCI Loans | Noncommercial |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans | 56 | 65
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 3,169 | $ 2,392
Financing Receivable, Modifications, Number of Contracts | loans | 151 | 177
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 6,617 | $ 7,853

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