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Loans and Allowance for Loan Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 26 | 20 | 50 | 73
Pre-Modification Outstanding Recorded Investment | $ 24,595,000 | $ 43,118,000 | $ 94,367,000 | $ 147,452,000
Post-Modification Outstanding Recorded Investment | $ 24,595,000 | $ 43,118,000 | $ 94,367,000 | $ 147,454,000
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract |  |  | 1 | 5
Pre-Modification Outstanding Recorded Investment |  |  | $ 1,564,000 | $ 5,684,000
Post-Modification Outstanding Recorded Investment |  |  | $ 1,564,000 | $ 5,684,000
Residential Mortgages [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 8 | 7 | 11 | 13
Pre-Modification Outstanding Recorded Investment | $ 930,000 | $ 970,000 | $ 1,048,000 | $ 2,068,000
Post-Modification Outstanding Recorded Investment | $ 930,000 | $ 970,000 | $ 1,048,000 | $ 2,068,000
Consumer [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 6 |  | 7 | 1
Pre-Modification Outstanding Recorded Investment | $ 89,000 |  | $ 311,000 | $ 40,000
Post-Modification Outstanding Recorded Investment | $ 89,000 |  | $ 311,000 | $ 42,000
Total Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 12 | 13 | 31 | 54
Pre-Modification Outstanding Recorded Investment | $ 23,576,000 | $ 42,148,000 | $ 91,444,000 | $ 139,660,000
Post-Modification Outstanding Recorded Investment | $ 23,576,000 | $ 42,148,000 | $ 91,444,000 | $ 139,660,000
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 11 | 13 | 29 | 50
Pre-Modification Outstanding Recorded Investment | $ 23,347,000 | $ 42,148,000 | $ 85,306,000 | $ 135,926,000
Post-Modification Outstanding Recorded Investment | $ 23,347,000 | $ 42,148,000 | $ 85,306,000 | $ 135,926,000
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | contract | 1 |  | 2 | 4
Pre-Modification Outstanding Recorded Investment | $ 229,000 |  | $ 6,138,000 | $ 3,734,000
Post-Modification Outstanding Recorded Investment | $ 229,000 |  | $ 6,138,000 | $ 3,734,000

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