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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 108,118 |  | $ 108,118 |  | $ 169,341
Recorded investment with an allowance | 194,279 |  | 194,279 |  | 132,004
Unpaid principal balance | 312,397 |  | 312,397 |  | 327,722
Related allowance | 23,490 |  | 23,490 |  | 29,295
Average recorded investment | 290,206 | $ 252,963 | 278,782 | $ 221,634 |
Interest income recognized | 943 | 194 | 1,986 | 1,119 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 5,160 |  | 5,160 |  | 10,447
Recorded investment with an allowance | 9,135 |  | 9,135 |  | 4,929
Unpaid principal balance | 14,451 |  | 14,451 |  | 15,708
Related allowance | 1,321 |  | 1,321 |  | 466
Average recorded investment | 14,604 | 7,729 | 14,449 | 8,624 |
Interest income recognized | 35 | 24 | 112 | 67 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 464 |  | 464 |  | 1,106
Recorded investment with an allowance | 16 |  | 16 |  | 832
Unpaid principal balance | 1,445 |  | 1,445 |  | 2,903
Related allowance | 1 |  | 1 |  | 38
Average recorded investment | 663 | 1,655 | 1,216 | 7,821 |
Interest income recognized | 1 |  | 1 |  |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 6,311 |  | 6,311 |  | 2,877
Recorded investment with an allowance | 2,630 |  | 2,630 |  | 1,470
Unpaid principal balance | 11,961 |  | 11,961 |  | 4,865
Related allowance | 406 |  | 406 |  | 91
Average recorded investment | 6,204 | 2,466 | 4,449 | 1,444 |
Interest income recognized | 7 | 3 | 12 | 7 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1 |  | 1 |  |
Recorded investment with an allowance | 1,305 |  | 1,305 |  | 2,154
Unpaid principal balance | 1,308 |  | 1,308 |  | 2,155
Related allowance | 405 |  | 405 |  | 267
Average recorded investment | 1,179 | 826 | 1,644 | 348 |
Interest income recognized | 4 | 2 | 9 | 4 |
Total Commercial & Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average recorded investment |  |  | 257,024 | 203,397 |
Interest income recognized |  |  | 1,852 | 1,041 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average recorded investment |  |  | 251,129 | 197,382 |
Interest income recognized |  |  | 1,806 | 1,002 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average recorded investment |  |  | 5,895 | 6,015 |
Interest income recognized |  |  | 46 | $ 39 |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 96,182 |  | 96,182 |  | 154,911
Recorded investment with an allowance | 181,193 |  | 181,193 |  | 122,619
Unpaid principal balance | 283,232 |  | 283,232 |  | 302,091
Related allowance | 21,357 |  | 21,357 |  | 28,433
Average recorded investment | 267,556 | 240,287 |  |  |
Interest income recognized | 896 | 165 |  |  |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 92,583 |  | 92,583 |  | 150,650
Recorded investment with an allowance | 178,441 |  | 178,441 |  | 120,612
Unpaid principal balance | 276,879 |  | 276,879 |  | 295,445
Related allowance | 20,880 |  | 20,880 |  | 28,187
Average recorded investment | 260,640 | 233,913 |  |  |
Interest income recognized | 872 | 155 |  |  |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 3,599 |  | 3,599 |  | 4,261
Recorded investment with an allowance | 2,752 |  | 2,752 |  | 2,007
Unpaid principal balance | 6,353 |  | 6,353 |  | 6,646
Related allowance | 477 |  | $ 477 |  | $ 246
Average recorded investment | 6,916 | 6,374 |  |  |
Interest income recognized | $ 24 | $ 10 |  |  |

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