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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, 2020 USD ($) contract | Dec. 31, 2019 USD ($) contract | Dec. 31, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 26 | 49 | 56
Pre-Modification Outstanding Recorded Investment | $ 4,570 | $ 68,118 | $ 94,760
Post-Modification Outstanding Recorded Investment | $ 4,570 | $ 61,307 | $ 94,760
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract |  | 1 | 1
Pre-Modification Outstanding Recorded Investment |  | $ 123 | $ 1,564
Post-Modification Outstanding Recorded Investment |  | $ 123 | $ 1,564
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1 | 3 |
Pre-Modification Outstanding Recorded Investment | $ 15 | $ 323 |
Post-Modification Outstanding Recorded Investment | $ 15 | $ 323 |
Residential Portfolio Segment |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 15 | 21 | 14
Pre-Modification Outstanding Recorded Investment | $ 3,424 | $ 3,286 | $ 1,297
Post-Modification Outstanding Recorded Investment | $ 3,424 | $ 3,286 | $ 1,297
Consumer Portfolio Segment |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 6 | 10 | 10
Pre-Modification Outstanding Recorded Investment | $ 89 | $ 168 | $ 455
Post-Modification Outstanding Recorded Investment | $ 89 | $ 168 | $ 455
Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 4 | 14 | 31
Pre-Modification Outstanding Recorded Investment | $ 1,042 | $ 64,218 | $ 91,444
Post-Modification Outstanding Recorded Investment | $ 1,042 | $ 57,407 | $ 91,444
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 3 | 13 | 29
Pre-Modification Outstanding Recorded Investment | $ 745 | $ 64,051 | $ 85,306
Post-Modification Outstanding Recorded Investment | $ 745 | $ 57,240 | $ 85,306
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate Owner Occupied |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | contract | 1 | 1 | 2
Pre-Modification Outstanding Recorded Investment | $ 297 | $ 167 | $ 6,138
Post-Modification Outstanding Recorded Investment | $ 297 | $ 167 | $ 6,138

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