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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 177,960 |  | $ 177,960 |  | $ 161,227
Recorded investment with an allowance | 47,178 |  | 47,178 |  | 107,528
Unpaid principal balance | 269,204 |  | 269,204 |  | 308,401
Related allowance | 12,218 |  | 12,218 |  | 5,114
Average recorded investment | 237,510 | $ 319,194 | 251,635 | $ 340,271 |
Interest income recognized | 1,139 | 2,394 | 4,485 | 6,227 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,222 |  | 1,222 |  | 1,138
Recorded investment with an allowance | 1,559 |  | 1,559 |  | 1,563
Unpaid principal balance | 3,793 |  | 3,793 |  | 3,428
Related allowance | 49 |  | 49 |  | 210
Average recorded investment | 2,331 | 6,718 | 2,430 | 10,988 |
Interest income recognized | 7 | 15 | 21 | 64 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 3,121 |  | 3,121 |  | 100
Recorded investment with an allowance | 264 |  | 264 |  | 21
Unpaid principal balance | 4,123 |  | 4,123 |  | 121
Related allowance | 29 |  | 29 |  | 1
Average recorded investment | 1,702 | 113 | 597 | 155 |
Interest income recognized | 2 |  | 2 |  |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 2,665 |  | 2,665 |  | 2,058
Recorded investment with an allowance | 1,636 |  | 1,636 |  | 1,818
Unpaid principal balance | 4,831 |  | 4,831 |  | 4,421
Related allowance | 183 |  | 183 |  | 444
Average recorded investment | 4,195 | 3,397 | 4,525 | 6,307 |
Interest income recognized | 2 | 4 | 9 | 14 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 494 |  | 494 |  | 279
Recorded investment with an allowance | 1,089 |  | 1,089 |  | 728
Unpaid principal balance | 1,864 |  | 1,864 |  | 1,253
Related allowance | 365 |  | 365 |  | 216
Average recorded investment | 1,552 | 745 | 1,442 | 769 |
Interest income recognized | 21 | 10 | 55 | 28 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 170,458 |  | 170,458 |  | 157,652
Recorded investment with an allowance | 42,630 |  | 42,630 |  | 103,398
Unpaid principal balance | 254,593 |  | 254,593 |  | 299,178
Related allowance | 11,592 |  | 11,592 |  | 4,243
Average recorded investment | 227,730 | 308,221 | 242,641 | 322,052 |
Interest income recognized | 1,107 | 2,365 | 4,398 | 6,121 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 161,275 |  | 161,275 |  | 144,625
Recorded investment with an allowance | 40,704 |  | 40,704 |  | 94,759
Unpaid principal balance | 239,506 |  | 239,506 |  | 273,290
Related allowance | 11,535 |  | 11,535 |  | 3,636
Average recorded investment | 213,291 | 283,519 | 225,597 | 295,636 |
Interest income recognized | 1,062 | 2,275 | 4,202 | 5,863 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 9,183 |  | 9,183 |  | 13,027
Recorded investment with an allowance | 1,926 |  | 1,926 |  | 8,639
Unpaid principal balance | 15,087 |  | 15,087 |  | 25,888
Related allowance | 57 |  | 57 |  | $ 607
Average recorded investment | 14,439 | 24,702 | 17,044 | 26,416 |
Interest income recognized | $ 45 | $ 90 | $ 196 | $ 258 |

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