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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	Dec. 31, 2015	Dec. 31, 2014
Receivables from Brokers-Dealers and Clearing Organizations [Abstract]
Deposits with clearing organizations	$ 864	$ 1,296
Unsettled regular way trades, net	4,367
Receivable from clearing organizations	34,581	46,771
Receivables from brokers, dealers, and clearing agencies	39,812	48,067
Payables to Broker-Dealers and Clearing Organizations [Abstract]
Unsettled regular way trades, net		4,971
Margin payable	55,779	89,473
Payables to brokers, dealers, and clearing agencies	$ 55,779	$ 94,444

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Payables 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-dealers or clearing organizations.

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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=35710130&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 940
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=35710130&loc=d3e41645-110958

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-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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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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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=35710059&loc=d3e41304-110954

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-Publisher FASB
-Name Accounting Standards Codification
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