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Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Book Value Of Impaired Loans Carried At Fair Value | $ 15,841 | $ 19,643 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 11,837 | 19,731 |
Impaired Financing Receivable, Related Allowance | 5,738 | 3,660 |
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount | 50,887 | 53,089 |
Impaired Financing Receivable, Recorded Investment | 69,224 | 73,712 | $ 76,231
Impaired loans carried at fair value | 12,599 | 16,963 |
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment | 53,383 | 54,069 |
Partial Charge-offs on Impaired Loans carried at Cost | 18,147 | 12,749 |
Impaired Financing Receivable, Carrying Value | 63,486 | 70,052 |
Partial Charge-Offs On Impaired Loans | 29,984 | 32,480 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 5,738 | 3,660 |
Financing Receivable, not collateral dependent [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 2,496 | 980 |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 3,242 | $ 2,680 |

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