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Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Securities Owned/Sold But Not Yet Purchased | Securities Owned/Sold But Not Yet Purchased – These securities consist of securities classified as trading and AFS, as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Securities Owned |  |  |  |  |  |  |  |
Trading securities |  | $ | 1,691 |  |  | $ | 1,556 |
Available-for-sale securities |  |  | 64,603 |  |  |  | 57,351 |
Total |  | $ | 66,294 |  |  | $ | 58,907 |
Securities Sold, but not yet Purchased |  |  |  |  |  |  |  |
Trading securities |  | $ | 950 |  |  | $ | 1,248 |
Available-for-sale securities |  |  | — |  |  |  | — |
Total |  | $ | 950 |  |  | $ | 1,248 |
Schedule of Unrealized Gains, Losses and Fair Value of AFS Securities | The following table summarizes unrealized gains, losses and fair value of the AFS securities:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Cost |  | $ | 65,237 |  |  | $ | 57,615 |
Gross unrealized gains in other comprehensive income |  |  | — |  |  |  | — |
Gross unrealized losses in other comprehensive income |  |  | (634 | ) |  |  | (264 | )
Fair value |  | $ | 64,603 |  |  | $ | 57,351 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of financial instruments held by a broker-dealer for its own account (proprietary securities) for trading or investment purposes that are carried at fair value including securities sold, not yet purchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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