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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | $ 132,668 |  | $ 132,668 |  | $ 55,034
Recorded investment with an allowance | 123,895 |  | 123,895 |  | 58,392
Unpaid principal balance | 271,236 |  | 271,236 |  | 118,623
Related allowance | 21,130 |  | 21,130 |  | 20,988
Average recorded investment | 252,963 | $ 92,527 | 221,634 | $ 64,011 |
Interest income recognized | 194 | 42 | 1,119 | 191 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 5,654 |  | 5,654 |  | 3,038
Recorded investment with an allowance | 2,001 |  | 2,001 |  | 8,085
Unpaid principal balance | 7,882 |  | 7,882 |  | 11,363
Related allowance | 57 |  | 57 |  | 1,382
Average recorded investment | 7,729 | 12,601 | 8,624 | 10,905 |
Interest income recognized | 24 | 15 | 67 | 56 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 1,228 |  | 1,228 |  | 12,461
Recorded investment with an allowance | 834 |  | 834 |  | 1,765
Unpaid principal balance | 2,905 |  | 2,905 |  | 14,784
Related allowance | 6 |  | 6 |  | 392
Average recorded investment | 1,655 | 3,207 | 7,821 | 4,762 |
Interest income recognized |  | 7 |  | 66 |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 2,908 |  | 2,908 |  |
Recorded investment with an allowance | 956 |  | 956 |  | 895
Unpaid principal balance | 4,382 |  | 4,382 |  | 1,405
Related allowance | 94 |  | 94 |  | 127
Average recorded investment | 2,466 | 1,136 | 1,444 | 1,837 |
Interest income recognized | 3 | 1 | 7 | 20 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment with an allowance | 1,485 |  | 1,485 |  | 152
Unpaid principal balance | 1,485 |  | 1,485 |  | 152
Related allowance | 85 |  | 85 |  | 33
Average recorded investment | 826 | 137 | 348 | 101 |
Interest income recognized | 2 |  | 4 | 3 |
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 122,878 |  | 122,878 |  | 39,535
Recorded investment with an allowance | 118,619 |  | 118,619 |  | 47,495
Unpaid principal balance | 254,582 |  | 254,582 |  | 90,919
Related allowance | 20,888 |  | 20,888 |  | 19,054
Average recorded investment | 240,287 | 75,446 | 203,397 | 46,406 |
Interest income recognized | 165 | 19 | 1,041 | 46 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 118,527 |  | 118,527 |  | 34,788
Recorded investment with an allowance | 116,512 |  | 116,512 |  | 46,834
Unpaid principal balance | 247,732 |  | 247,732 |  | 84,988
Related allowance | 20,665 |  | 20,665 |  | 19,031
Average recorded investment | 233,913 | 53,862 | 197,382 | 31,570 |
Interest income recognized | 155 | 3 | 1,002 | 6 |
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded investment without an allowance | 4,351 |  | 4,351 |  | 4,747
Recorded investment with an allowance | 2,107 |  | 2,107 |  | 661
Unpaid principal balance | 6,850 |  | 6,850 |  | 5,931
Related allowance | 223 |  | 223 |  | $ 23
Average recorded investment | 6,374 | 21,584 | 6,015 | 14,836 |
Interest income recognized | $ 10 | $ 16 | $ 39 | $ 40 |

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