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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 138,477 |  | $ 138,477 |  | $ 147,055
Recorded investment with an allowance | 192,826 |  | 192,826 |  | 170,142
Unpaid principal balance | 347,828 |  | 347,828 |  | 341,713
Related allowance | 20,830 |  | 20,830 |  | 18,566
Average recorded investment | 354,338 | $ 267,238 | 350,811 | $ 273,070 |
Interest income recognized | 2,142 | 655 | 3,833 | 1,043 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,765 |  | 1,765 |  | 5,101
Recorded investment with an allowance | 7,055 |  | 7,055 |  | 10,429
Unpaid principal balance | 9,840 |  | 9,840 |  | 15,687
Related allowance | 407 |  | 407 |  | 1,326
Average recorded investment | 11,446 | 14,257 | 13,123 | 14,372 |
Interest income recognized | 24 | 34 | 49 | 77 |
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 | 13 |  | 13 |  | 263
Unpaid principal balance | 113 |  | 113 |  | 363
Related allowance | 1 |  | 1 |  | 11
Average recorded investment | 113 | 1,219 | 176 | 1,492 |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 2,430 |  | 2,430 |  | 8,245
Recorded investment with an allowance | 1,303 |  | 1,303 |  | 2,395
Unpaid principal balance | 6,748 |  | 6,748 |  | 13,855
Related allowance | 99 |  | 99 |  | 189
Average recorded investment | 6,036 | 3,352 | 7,762 | 3,572 |
Interest income recognized | 5 | 3 | 10 | 5 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment with an allowance | 599 |  | 599 |  | 1,292
Unpaid principal balance | 599 |  | 599 |  | 1,294
Related allowance | 130 |  | 130 |  | 118
Average recorded investment | 608 | 1,601 | 781 | 1,876 |
Interest income recognized | 9 | 3 | 18 | 5 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 134,182 |  | 134,182 |  | 133,609
Recorded investment with an allowance | 183,856 |  | 183,856 |  | 155,763
Unpaid principal balance | 330,528 |  | 330,528 |  | 310,514
Related allowance | 20,193 |  | 20,193 |  | 16,922
Average recorded investment | 336,135 | 246,809 | 328,969 | 251,758 |
Interest income recognized | 2,104 | 615 | 3,756 | 956 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 125,440 |  | 125,440 |  | 116,682
Recorded investment with an allowance | 165,631 |  | 165,631 |  | 151,199
Unpaid principal balance | 302,314 |  | 302,314 |  | 285,685
Related allowance | 19,369 |  | 19,369 |  | 16,129
Average recorded investment | 307,492 | 241,122 | 301,695 | 246,374 |
Interest income recognized | 2,002 | 597 | 3,588 | 934 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 8,742 |  | 8,742 |  | 16,927
Recorded investment with an allowance | 18,225 |  | 18,225 |  | 4,564
Unpaid principal balance | 28,214 |  | 28,214 |  | 24,829
Related allowance | 824 |  | 824 |  | $ 793
Average recorded investment | 28,643 | 5,687 | 27,274 | 5,384 |
Interest income recognized | $ 102 | $ 18 | $ 168 | $ 22 |

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