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Financial Instruments (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended |
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Jun. 30, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Interest Rate Cap [Member] | Jun. 30, 2012 Interest Rate Cap [Member] | Mar. 31, 2011 Senior Secured Credit Note [Member] | Jun. 30, 2012 Credit Concentration Risk [Member] | Jun. 30, 2011 Credit Concentration Risk [Member] | Jun. 30, 2012 Credit Concentration Risk [Member] Rate | Jun. 30, 2011 Credit Concentration Risk [Member] | Dec. 31, 2011 Credit Concentration Risk [Member] | Jun. 30, 2012 Reverse Repurchase Agreement [Member] | Dec. 31, 2011 Reverse Repurchase Agreement [Member] | Jun. 30, 2012 Securities Borrowed Transactions [Member] | Dec. 31, 2011 Securities Borrowed Transactions [Member] | Jun. 30, 2012 U S Treasury Notes Securities [Member] Contract | Jun. 30, 2012 Federal Fund [Member] Contract | Jun. 30, 2012 Auction rate securities purchase commitment [Member] | Jun. 30, 2012 Auction rate securities purchase commitment [Member] | Jun. 30, 2012 Auction rate securities purchase commitment [Member] Maximum [Member] | Jun. 30, 2012 Deferred Compensation Share Based Payments [Member] Corporate equities liabilities [Member] | Dec. 31, 2011 Deferred Compensation Share Based Payments [Member] Corporate equities liabilities [Member] | Jun. 30, 2012 Corporate [Member] | Jun. 30, 2012 Other than corporate customer [Member] | Mar. 31, 2011 Swaps [Member] | Jun. 30, 2012 Lehman brothers international Europe [Member] | Jun. 30, 2012 Two Major US Broker [Member]
Financial Instruments (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Owned | $ 1,100,644,000 |  |  | $ 1,100,644,000 | $ 924,541,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,100,000 | $ 13,200,000 |  |  |  |  |
Company purchased and holds auction rate securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,700,000 | 77,700,000 |  |  |  |  |  |  |  |
Securities purchases against purchase offers and legal settlement and proprietary position | 77,900,000 |  |  | 77,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase ARS from clients through 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,400,000 | 40,400,000 |  |  |  |  |  |  |  |
Commitment to purchase ARS period maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2016 |  |  |  |  |  |  |
Legal settlements with clients related ARS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,700,000 |  |  |  |  |  |  |  |
ARS held in proprietary trading account result of the failed auctions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 | 150,000 |  |  |  |  |  |  |  |
Valuation adjustment (unrealized loss) for ARS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000 | 5,700,000 |  |  |  |  |  |  |  |
Assets and liabilities transferred from level one and level two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Loan position held in secondary loan trading portfolio | 0 |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the reverse repurchase agreements | 5,200,000 |  |  | 5,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the repurchase agreements | 52,600,000 |  |  | 52,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit note reference rate description |  |  |  |  |  |  |  | 3-Month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2011 |  |
Maturity date of interest rate cap contract |  |  |  | 2012-12-31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward or delayed delivery of the underlying instrument with settlement |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Value of purchase of to be announced securities | 1,200,000 |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Value of sale of to be announced securities | 1,200,000 |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHA loan commitments balance | 421,500,000 |  |  | 421,500,000 | 326,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OMHHF had a loan receivable balance (included in other assets) | 80,900,000 |  |  | 80,900,000 | 109,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of open short contract's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |
Open short contracts expiry period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Open contracts for Federal Funds futures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000,000 |  |  |  |  |  |  |  |  |  |
Open contracts for Federal Funds futures with a fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,750 | 154,615 |  |  |  |  |  |  |  |  |  |
Net gain on the interest rate swaps, after tax |  |  | 69,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ineffective portion of derivative included in income |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassified of other comprehensive income (loss) to other expenses |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank call loans | 86,900,000 |  |  | 86,900,000 | 27,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized loans, collateralized by firm with market values |  |  |  |  |  |  |  |  |  |  |  |  |  | 206,400,000 | 209,900,000 | 5,700,000,000 | 5,500,000,000 |  |  |  |  |  |  |  | 95,700,000 | 208,100,000 |  |  |
Customer securities under customer margin loans available to be pledged | 1,200,000,000 |  |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer securities under customer margin loans agreement available to be repledged | 269,800,000 |  |  | 269,800,000 |  |  |  |  |  |  |  |  |  | 20,500,000 | 44,000,000 | 5,700,000 | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Customer securities deposited to secure obligations and margin requirements under option contracts | 622,800,000 |  |  | 622,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross balances of reverse repurchase agreements | 5,700,000,000 |  |  | 5,700,000,000 | 5,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross balances of repurchase agreements | 6,400,000,000 |  |  | 6,400,000,000 | 6,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of pledged securities owned that can be sold or repledged by the counterparty | 755,400,000 |  |  | 755,400,000 | 653,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of securities owned by the Company loaned or pledged | 152,600,000 |  |  | 152,600,000 | 119,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lehman Brothers International (Europe) held securities with a fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,700,000 |
Receivable from brokers and clearing organizations | 294,444,000 |  |  | 294,444,000 | 288,113,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,500,000
Maximum aggregate principal amount of the warehouse facility |  |  |  |  |  |  |  |  | 1,500,000,000 |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilization of warehouse facility |  |  |  |  |  |  |  |  | 61,200,000 |  | 61,200,000 |  | 65,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warehouse facility excess retention |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facilities in leveraged financing transactions |  |  |  |  |  |  |  |  | 4,700,000 |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed mortgages for a period |  |  |  |  |  |  |  |  | 10 days |  | 10 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding under the warehouse facility line |  |  |  |  |  |  |  |  | 54,000,000 |  | 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate under warehouse facility |  |  |  |  |  |  |  |  |  |  | 1 month LIBOR plus 2.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  |  |  |  |  | 2.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 573 | $ 19,775 |  | $ 235,000 | $ 332,000 | $ 700,000 | $ 1,160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fair value as of the balance sheet date of customer securities accepted as collateral by the entity that it has sold or re-pledged to counterparties as collateral. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Description of the relevant terms of the derivative. Includes the type of instrument, risk being hedged, notional amount, counterparty, inception date, maturity date, relevant interest rates, strike price, cap price, and floor price. + References No definition available. + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount that a bank with insufficient reserves at a Federal Reserve Bank borrows, at the federal funds rate, from another bank to meet its reserve requirements for that day and the amount of securities that an institution sells and agrees to repurchase at a specified date for a specified price, net of any reductions or offsets. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount receivable from securities failed to deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage items. Also cash and securities [guarantee] on deposit with [commodities] clearing organizations and other entities which provide services necessary to operations of the Company. This item would include, for instance, cash and securities advanced as [refundable] collateral for securities borrowed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 4 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524 + Details
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- Definition Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 22 - 31 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=7491637&loc=d3e13433-108611 Reference 3: 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=6475986&loc=d3e42546-110969 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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