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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, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | $ 133,684 |  | $ 169,341
Recorded investment with an allowance | 122,774 |  | 132,004
Unpaid principal balance | 270,818 |  | 327,722
Related allowance | 16,501 |  | 29,295
Average recorded investment | 278,903 | $ 172,084 |
Interest income recognized | 388 | 221 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 5,740 |  | 10,447
Recorded investment with an allowance | 7,859 |  | 4,929
Unpaid principal balance | 13,934 |  | 15,708
Related allowance | 1,114 |  | 466
Average recorded investment | 14,487 | 9,902 |
Interest income recognized | 43 | 22 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 1,576 |  | 1,106
Recorded investment with an allowance | 16 |  | 832
Unpaid principal balance | 2,556 |  | 2,903
Related allowance | 1 |  | 38
Average recorded investment | 1,766 | 14,149 |
Interest income recognized |  |  |
Residential Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 2,158 |  | 2,877
Recorded investment with an allowance | 1,078 |  | 1,470
Unpaid principal balance | 3,761 |  | 4,865
Related allowance | 94 |  | 91
Average recorded investment | 3,792 | 889 |
Interest income recognized | 2 | 2 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 1,243 |  |
Recorded investment with an allowance | 906 |  | 2,154
Unpaid principal balance | 2,149 |  | 2,155
Related allowance | 199 |  | 267
Average recorded investment | 2,152 | 105 |
Interest income recognized | 2 | 1 |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 122,967 |  | 154,911
Recorded investment with an allowance | 112,915 |  | 122,619
Unpaid principal balance | 248,418 |  | 302,091
Related allowance | 15,093 |  | 28,433
Average recorded investment | 256,706 | 147,039 |
Interest income recognized | 341 | 196 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 120,166 |  | 150,650
Recorded investment with an allowance | 111,822 |  | 120,612
Unpaid principal balance | 244,153 |  | 295,445
Related allowance | 15,017 |  | 28,187
Average recorded investment | 251,625 | 141,326 |
Interest income recognized | 337 | 182 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Recorded investment without an allowance | 2,801 |  | 4,261
Recorded investment with an allowance | 1,093 |  | 2,007
Unpaid principal balance | 4,265 |  | 6,646
Related allowance | 76 |  | $ 246
Average recorded investment | 5,081 | 5,713 |
Interest income recognized | $ 4 | $ 14 |

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