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Disclosures About Offsetting Assets And Liabilities (Financial Assets And Derivative Assets That Are Subject To Offset) (Details) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Offsetting Assets [Line Items] |  |  |
Fair value of securities pledged as collateral | [1] | $ 266,267 | $ 266,008
Fair Value Of Securities Pledged As Collateral [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Fair value of securities pledged as collateral |  | $ 562,400 | $ 509,400
[1] | Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $562.4 million and $509.4 million at June 30, 2018 and December 31, 2017, respectively.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of securities received as collateral against securities purchased under agreement to resell. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313 + Details
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