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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 119,917 |  | $ 119,917 |  | $ 169,341
Recorded investment with an allowance | 158,098 |  | 158,098 |  | 132,004
Unpaid principal balance | 290,322 |  | 290,322 |  | 327,722
Related allowance | 24,896 |  | 24,896 |  | 29,295
Average recorded investment | 267,238 | $ 239,856 | 273,070 | $ 205,971 |
Interest income recognized | 655 | 532 | 1,043 | 925 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 5,678 |  | 5,678 |  | 10,447
Recorded investment with an allowance | 9,235 |  | 9,235 |  | 4,929
Unpaid principal balance | 15,349 |  | 15,349 |  | 15,708
Related allowance | 1,402 |  | 1,402 |  | 466
Average recorded investment | 14,257 | 8,242 | 14,372 | 9,072 |
Interest income recognized | 34 | 22 | 77 | 43 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 831 |  | 831 |  | 1,106
Recorded investment with an allowance | 16 |  | 16 |  | 832
Unpaid principal balance | 1,820 |  | 1,820 |  | 2,903
Related allowance | 1 |  | 1 |  | 38
Average recorded investment | 1,219 | 7,660 | 1,492 | 10,905 |
Interest income recognized |  |  |  |  |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 2,338 |  | 2,338 |  | 2,877
Recorded investment with an allowance | 1,128 |  | 1,128 |  | 1,470
Unpaid principal balance | 3,984 |  | 3,984 |  | 4,865
Related allowance | 172 |  | 172 |  | 91
Average recorded investment | 3,352 | 976 | 3,572 | 932 |
Interest income recognized | 3 | 2 | 5 | 4 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1 |  | 1 |  |
Recorded investment with an allowance | 1,052 |  | 1,052 |  | 2,154
Unpaid principal balance | 1,055 |  | 1,055 |  | 2,155
Related allowance | 283 |  | 283 |  | 267
Average recorded investment | 1,601 | 112 | 1,876 | 109 |
Interest income recognized | 3 | 1 | 5 | 2 |
Total Commercial & Industrial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average recorded investment |  |  | 251,758 | 184,953 |
Interest income recognized |  |  | 956 | 876 |
Total Commercial & Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average recorded investment |  |  | 246,374 | 179,117 |
Interest income recognized |  |  | 934 | 847 |
Total Commercial & Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average recorded investment |  |  | 5,384 | 5,836 |
Interest income recognized |  |  | 22 | $ 29 |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 111,069 |  | 111,069 |  | 154,911
Recorded investment with an allowance | 146,667 |  | 146,667 |  | 122,619
Unpaid principal balance | 268,114 |  | 268,114 |  | 302,091
Related allowance | 23,038 |  | 23,038 |  | 28,433
Average recorded investment | 246,809 | 222,866 |  |  |
Interest income recognized | 615 | 507 |  |  |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 107,555 |  | 107,555 |  | 150,650
Recorded investment with an allowance | 142,701 |  | 142,701 |  | 120,612
Unpaid principal balance | 260,544 |  | 260,544 |  | 295,445
Related allowance | 22,758 |  | 22,758 |  | 28,187
Average recorded investment | 241,122 | 216,907 |  |  |
Interest income recognized | 597 | 493 |  |  |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 3,514 |  | 3,514 |  | 4,261
Recorded investment with an allowance | 3,966 |  | 3,966 |  | 2,007
Unpaid principal balance | 7,570 |  | 7,570 |  | 6,646
Related allowance | 280 |  | $ 280 |  | $ 246
Average recorded investment | 5,687 | 5,959 |  |  |
Interest income recognized | $ 18 | $ 14 |  |  |

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