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Loans (Loans Individually Evaluated for Impairment Disaggregated by Portfolio Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | $ 169,341 | $ 55,034
Recorded investment with an allowance | 132,004 | 58,392
Unpaid principal balance | 327,722 | 118,623
Related allowance | 29,295 | 20,988
Average recorded investment | 236,013 | 74,184
Interest income recognized | 1,330 | 242
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 10,447 | 3,038
Recorded investment with an allowance | 4,929 | 8,085
Unpaid principal balance | 15,708 | 11,363
Related allowance | 466 | 1,382
Average recorded investment | 9,347 | 11,396
Interest income recognized | 106 | 85
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 1,106 | 12,461
Recorded investment with an allowance | 832 | 1,765
Unpaid principal balance | 2,903 | 14,784
Related allowance | 38 | 392
Average recorded investment | 6,366 | 5,508
Interest income recognized | 1 | 66
Residential Mortgages [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 2,877 |
Recorded investment with an allowance | 1,470 | 895
Unpaid principal balance | 4,865 | 1,405
Related allowance | 91 | 127
Average recorded investment | 2,109 | 1,618
Interest income recognized | 10 | 22
Consumer [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment with an allowance | 2,154 | 152
Unpaid principal balance | 2,155 | 152
Related allowance | 267 | 33
Average recorded investment | 716 | 119
Interest income recognized | 5 | 4
Total Commercial & Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 154,911 | 39,535
Recorded investment with an allowance | 122,619 | 47,495
Unpaid principal balance | 302,091 | 90,919
Related allowance | 28,433 | 19,054
Average recorded investment | 217,475 | 55,543
Interest income recognized | 1,208 | 65
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 150,650 | 34,788
Recorded investment with an allowance | 120,612 | 46,834
Unpaid principal balance | 295,445 | 84,988
Related allowance | 28,187 | 19,031
Average recorded investment | 211,324 | 41,274
Interest income recognized | 1,164 | 11
Total Commercial & Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded investment without an allowance | 4,261 | 4,747
Recorded investment with an allowance | 2,007 | 661
Unpaid principal balance | 6,646 | 5,931
Related allowance | 246 | 23
Average recorded investment | 6,151 | 14,269
Interest income recognized | $ 44 | $ 54

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