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Loans and Allowance for Loan Losses (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | $ 147,055 | $ 169,341
Recorded investment with an allowance | 170,142 | 132,004
Unpaid principal balance | 341,713 | 327,722
Related allowance | 18,566 | 29,295
Average recorded investment | 286,536 | 236,013
Interest income recognized | 3,015 | 1,330
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 5,101 | 10,447
Recorded investment with an allowance | 10,429 | 4,929
Unpaid principal balance | 15,687 | 15,708
Related allowance | 1,326 | 466
Average recorded investment | 14,565 | 9,347
Interest income recognized | 146 | 106
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 100 | 1,106
Recorded investment with an allowance | 263 | 832
Unpaid principal balance | 363 | 2,903
Related allowance | 11 | 38
Average recorded investment | 1,018 | 6,366
Interest income recognized | 2 | 1
Residential Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 8,245 | 2,877
Recorded investment with an allowance | 2,395 | 1,470
Unpaid principal balance | 13,855 | 4,865
Related allowance | 189 | 91
Average recorded investment | 5,784 | 2,109
Interest income recognized | 18 | 10
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with an allowance | 1,292 | 2,154
Unpaid principal balance | 1,294 | 2,155
Related allowance | 118 | 267
Average recorded investment | 1,558 | 716
Interest income recognized | 13 | 5
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 133,609 | 154,911
Recorded investment with an allowance | 155,763 | 122,619
Unpaid principal balance | 310,514 | 302,091
Related allowance | 16,922 | 28,433
Average recorded investment | 263,611 | 217,475
Interest income recognized | 2,836 | 1,208
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 116,682 | 150,650
Recorded investment with an allowance | 151,199 | 120,612
Unpaid principal balance | 285,685 | 295,445
Related allowance | 16,129 | 28,187
Average recorded investment | 255,710 | 211,324
Interest income recognized | 2,774 | 1,164
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 16,927 | 4,261
Recorded investment with an allowance | 4,564 | 2,007
Unpaid principal balance | 24,829 | 6,646
Related allowance | 793 | 246
Average recorded investment | 7,901 | 6,151
Interest income recognized | $ 62 | $ 44

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