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Loans and Allowance for Credit Losses (Troubled Debt Restructurings Modified by Portfolio Segment) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract | Dec. 31, 2017 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 49 | 56 | 78
Pre-Modification Outstanding Recorded Investment | $ 68,118 | $ 94,760 | $ 177,070
Post-Modification Outstanding Recorded Investment | $ 61,307 | $ 94,760 | $ 177,070
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1 | 1 | 5
Pre-Modification Outstanding Recorded Investment | $ 123 | $ 1,564 | $ 5,625
Post-Modification Outstanding Recorded Investment | $ 123 | $ 1,564 | $ 5,625
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 3 |  |
Pre-Modification Outstanding Recorded Investment | $ 323 |  |
Post-Modification Outstanding Recorded Investment | $ 323 |  |
Residential Mortgages [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 21 | 14 | 15
Pre-Modification Outstanding Recorded Investment | $ 3,286 | $ 1,297 | $ 2,812
Post-Modification Outstanding Recorded Investment | $ 3,286 | $ 1,297 | $ 2,812
Consumer [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 10 | 10 | 1
Pre-Modification Outstanding Recorded Investment | $ 168 | $ 455 | $ 40
Post-Modification Outstanding Recorded Investment | $ 168 | $ 455 | $ 40
Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 14 | 31 | 57
Pre-Modification Outstanding Recorded Investment | $ 64,218 | $ 91,444 | $ 168,593
Post-Modification Outstanding Recorded Investment | $ 57,407 | $ 91,444 | $ 168,593
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 13 | 29 | 52
Pre-Modification Outstanding Recorded Investment | $ 64,051 | $ 85,306 | $ 162,909
Post-Modification Outstanding Recorded Investment | $ 57,240 | $ 85,306 | $ 162,909
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 | 5
Pre-Modification Outstanding Recorded Investment | $ 167 | $ 6,138 | $ 5,684
Post-Modification Outstanding Recorded Investment | $ 167 | $ 6,138 | $ 5,684

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