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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 |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | $ 126,992 |  | $ 147,055
Recorded investment with an allowance | 250,378 |  | 170,142
Unpaid principal balance | 392,958 |  | 341,713
Related allowance | 24,601 |  | 18,566
Average recorded investment | 347,285 | $ 278,903 |
Interest income recognized | 1,691 | 388 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 6,055 |  | 5,101
Recorded investment with an allowance | 8,016 |  | 10,429
Unpaid principal balance | 14,269 |  | 15,687
Related allowance | 1,261 |  | 1,326
Average recorded investment | 14,801 | 14,487 |
Interest income recognized | 25 | 43 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 100 |  | 100
Recorded investment with an allowance | 13 |  | 263
Unpaid principal balance | 114 |  | 363
Related allowance | 1 |  | 11
Average recorded investment | 238 | 1,766 |
Interest income recognized |  |  |
Residential Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 5,861 |  | 8,245
Recorded investment with an allowance | 2,477 |  | 2,395
Unpaid principal balance | 11,682 |  | 13,855
Related allowance | 276 |  | 189
Average recorded investment | 9,489 | 3,792 |
Interest income recognized | 5 | 2 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 14 |  |
Recorded investment with an allowance | 603 |  | 1,292
Unpaid principal balance | 718 |  | 1,294
Related allowance | 232 |  | 118
Average recorded investment | 955 | 2,152 |
Interest income recognized | 9 | 2 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 114,962 |  | 133,609
Recorded investment with an allowance | 239,269 |  | 155,763
Unpaid principal balance | 366,175 |  | 310,514
Related allowance | 22,831 |  | 16,922
Average recorded investment | 321,802 | 256,706 |
Interest income recognized | 1,652 | 341 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 108,898 |  | 116,682
Recorded investment with an allowance | 215,015 |  | 151,199
Unpaid principal balance | 335,178 |  | 285,685
Related allowance | 20,356 |  | 16,129
Average recorded investment | 295,897 | 251,625 |
Interest income recognized | 1,586 | 337 |
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 6,064 |  | 16,927
Recorded investment with an allowance | 24,254 |  | 4,564
Unpaid principal balance | 30,997 |  | 24,829
Related allowance | 2,475 |  | $ 793
Average recorded investment | 25,905 | 5,081 |
Interest income recognized | $ 66 | $ 4 |

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