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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, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Book Value Of Impaired Loans Carried At Fair Value | $ 6,377 | $ 3,577 |
Partial Charge-Offs On Impaired Loans carried at Fair Value | 3,708 | 2,780 |
Impaired Financing Receivable, Related Allowance | 1,846 | 684 |
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount | 38,667 | 52,306 |
Impaired Financing Receivable, Recorded Investment | 46,760 | 56,564 | $ 73,609
Impaired Loan Fair Value | 6,247 | 3,574 |
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment | 40,383 | 52,987 |
Partial Charge-offs on Impaired Loans carried at Cost | 7,361 | 7,260 |
Impaired Financing Receivable, Carrying Value | 44,914 | 55,880 |
Partial Charge-Offs On Impaired Loans | 11,069 | 10,040 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,846 | 684 |
Financing Receivable, not collateral dependent [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 1,716 | 681 |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |
Schedule of Impaired Financing Receivables Additional Information [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 130 | $ 3 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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