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Receivables From And Payables To Brokers, Dealers, And Clearing Agencies (Schedule Of Due To (From) Broker-Dealers And Clearing Organizations) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Receivables from Brokers-Dealers and Clearing Organizations [Abstract]
Deposits with clearing organizations	$ 1,417	$ 1,516
Unsettled regular way trades, net	13,111	9,653
Receivable from clearing organizations	953	1,084
Receivables from brokers, dealers, and clearing agencies	15,481	12,253
Payables to Broker-Dealers and Clearing Organizations [Abstract]
Margin payable	5,406	96,211
Payables to brokers, dealers, and clearing agencies	$ 5,406	$ 96,211

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Receivables from unsettled regular way trades, net.

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Amount of right to receive cash and securities on deposit with broker-dealers to demonstrate an intention to complete a purchase (good faith deposit) and collateral deposited by counterparty to cover the credit risk assumed (margin deposit).

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Amount of other payables due to broker-dealer.

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Amount payable to broker-dealers and clearing organizations, including, but not limited to, securities failed-to-receive, certain deposits received for securities loaned, open transactions, and floor-brokerage payables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6475717&loc=d3e41645-110958

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Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



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-Name Accounting Standards Codification

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Amount of right to receive cash and securities on deposit with clearing organizations. Clearing organizations perform post trade processing and trade comparisons among numerous broker-dealers and act as settlement agents between buying and selling broker-dealers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



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-Name Accounting Standards Codification

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-Section 25

-URI http://asc.fasb.org/section&trid=2176260

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