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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, 2017 | Dec. 31, 2016 | Sep. 30, 2016
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Book Value Of Impaired Loans Carried At Fair Value | $ 7,470 | $ 6,379 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 2,822 | 3,681 |
Impaired Financing Receivable, Related Allowance | 5,102 | 548 |
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount | 61,370 | 63,895 |
Impaired Financing Receivable, Recorded Investment | 73,609 | 70,426 | $ 77,998
Impaired Loan Fair Value | 7,137 | 5,983 |
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment | 66,139 | 64,047 |
Partial Charge-offs on Impaired Loans carried at Cost | 7,124 | 21,262 |
Impaired Financing Receivable, Carrying Value | 68,507 | 69,878 |
Partial Charge-Offs On Impaired Loans | 9,946 | 24,943 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 5,102 | 548 |
Financing Receivable, not collateral dependent [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 4,769 | 152 |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 333 | $ 396 |

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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