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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 158,601 |  | $ 158,601 |  | $ 147,055
Recorded investment with an allowance | 148,480 |  | 148,480 |  | 170,142
Unpaid principal balance | 330,130 |  | 330,130 |  | 341,713
Related allowance | 23,906 |  | 23,906 |  | 18,566
Average recorded investment | 319,194 | $ 290,206 | 340,271 | $ 278,782 |
Interest income recognized | 2,394 | 943 | 6,227 | 1,986 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 2,977 |  | 2,977 |  | 5,101
Recorded investment with an allowance | 1,638 |  | 1,638 |  | 10,429
Unpaid principal balance | 5,474 |  | 5,474 |  | 15,687
Related allowance | 285 |  | 285 |  | 1,326
Average recorded investment | 6,718 | 14,604 | 10,988 | 14,449 |
Interest income recognized | 15 | 35 | 64 | 112 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 100 |  | 100 |  | 100
Recorded investment with an allowance | 12 |  | 12 |  | 263
Unpaid principal balance | 112 |  | 112 |  | 363
Related allowance | 1 |  | 1 |  | 11
Average recorded investment | 113 | 663 | 155 | 1,216 |
Interest income recognized |  | 1 |  | 1 |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,482 |  | 1,482 |  | 8,245
Recorded investment with an allowance | 1,579 |  | 1,579 |  | 2,395
Unpaid principal balance | 3,609 |  | 3,609 |  | 13,855
Related allowance | 163 |  | 163 |  | 189
Average recorded investment | 3,397 | 6,204 | 6,307 | 4,449 |
Interest income recognized | 4 | 7 | 14 | 12 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 279 |  | 279 |  |
Recorded investment with an allowance | 611 |  | 611 |  | 1,292
Unpaid principal balance | 1,136 |  | 1,136 |  | 1,294
Related allowance | 131 |  | 131 |  | 118
Average recorded investment | 745 | 1,179 | 769 | 1,644 |
Interest income recognized | 10 | 4 | 28 | 9 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 153,763 |  | 153,763 |  | 133,609
Recorded investment with an allowance | 144,640 |  | 144,640 |  | 155,763
Unpaid principal balance | 319,799 |  | 319,799 |  | 310,514
Related allowance | 23,326 |  | 23,326 |  | 16,922
Average recorded investment | 308,221 | 267,556 | 322,052 | 257,024 |
Interest income recognized | 2,365 | 896 | 6,121 | 1,852 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 140,504 |  | 140,504 |  | 116,682
Recorded investment with an allowance | 135,462 |  | 135,462 |  | 151,199
Unpaid principal balance | 293,012 |  | 293,012 |  | 285,685
Related allowance | 23,101 |  | 23,101 |  | 16,129
Average recorded investment | 283,519 | 260,640 | 295,636 | 251,129 |
Interest income recognized | 2,275 | 872 | 5,863 | 1,806 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 13,259 |  | 13,259 |  | 16,927
Recorded investment with an allowance | 9,178 |  | 9,178 |  | 4,564
Unpaid principal balance | 26,787 |  | 26,787 |  | 24,829
Related allowance | 225 |  | 225 |  | $ 793
Average recorded investment | 24,702 | 6,916 | 26,416 | 5,895 |
Interest income recognized | $ 90 | $ 24 | $ 258 | $ 46 |

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