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Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract | Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 7 | 40 | 24 | 53
Pre-Modification Outstanding Recorded Investment | $ 6,552 | $ 59,242 | $ 69,772 | $ 104,334
Post-Modification Outstanding Recorded Investment | $ 6,552 | $ 59,244 | $ 69,772 | $ 104,336
Total Commercial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 5 | 31 |  |
Pre-Modification Outstanding Recorded Investment | $ 6,477 | $ 57,395 |  |
Post-Modification Outstanding Recorded Investment | $ 6,477 | $ 57,395 |  |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  | 3 | 1 | 5
Pre-Modification Outstanding Recorded Investment |  | $ 959 | $ 1,564 | $ 6,486
Post-Modification Outstanding Recorded Investment |  | $ 959 | $ 1,564 | $ 6,486
Residential Mortgages [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 2 | 5 | 3 | 6
Pre-Modification Outstanding Recorded Investment | $ 75 | $ 848 | $ 118 | $ 1,098
Post-Modification Outstanding Recorded Investment | $ 75 | $ 848 | $ 118 | $ 1,098
Consumer [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  | 1 | 1 | 1
Pre-Modification Outstanding Recorded Investment |  | $ 40 | $ 222 | $ 40
Post-Modification Outstanding Recorded Investment |  | $ 42 | $ 222 | $ 42
Total Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  | 19 | 41
Pre-Modification Outstanding Recorded Investment |  |  | $ 67,868 | $ 96,710
Post-Modification Outstanding Recorded Investment |  |  | $ 67,868 | $ 96,710
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 5 | 28 | 18 | 37
Pre-Modification Outstanding Recorded Investment | $ 6,477 | $ 54,317 | $ 61,959 | $ 92,976
Post-Modification Outstanding Recorded Investment | $ 6,477 | $ 54,317 | $ 61,959 | $ 92,976
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  | 3 | 1 | 4
Pre-Modification Outstanding Recorded Investment |  | $ 3,078 | $ 5,909 | $ 3,734
Post-Modification Outstanding Recorded Investment |  | $ 3,078 | $ 5,909 | $ 3,734

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