Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Cash and cash equivalents	$ 26,675	$ 14,156
Securities purchased under agreements to resell	141,964	75,455
Trading securities owned	746,213	474,951
Available-for-sale Securities	1,476,681	1,214,141
Investments	242,674	239,208
Securities purchased under agreements to repurchase	78,437	80,176
Bank deposits	2,923,671	2,071,738
Trading securities sold, but not yet purchased	369,886	266,833
Derivative contracts	22,455	24,877
Carrying Value [Member]
Cash and cash equivalents	193,333	167,671
Restricted cash	6,589	6,883
Cash segregated for regulatory purposes	28	26
Securities purchased under agreements to resell	141,964	75,455
Trading securities owned	746,213	474,951
Available-for-sale Securities	1,476,681	1,214,141
Held-to-maturity securities	657,933	190,484
Loans held for sale	209,358	131,754
Bank loans	746,567	632,140
Investments	242,674	239,208
Securities purchased under agreements to repurchase	78,437	80,176
Bank deposits	2,923,671	2,071,738
Trading securities sold, but not yet purchased	369,886	266,833
Securities sold, but not yet purchased	22,194	19,223
Derivative contracts	22,455	24,877
Senior notes	175,000
Debentures to Stifel Financial Capital Trusts	82,500	82,500
Liabilities subordinated to the claims of general creditors	5,318	6,957
Estimated Fair Value [Member]
Cash and cash equivalents	193,333	167,671
Restricted cash	6,589	6,883
Cash segregated for regulatory purposes	28	26
Securities purchased under agreements to resell	141,964	75,455
Trading securities owned	746,213	474,951
Available-for-sale Securities	1,476,681	1,214,141
Held-to-maturity securities	664,593	189,071
Loans held for sale	209,358	131,754
Bank loans	765,467	639,341
Investments	242,674	239,208
Securities purchased under agreements to repurchase	78,437	80,176
Bank deposits	2,924,394	2,067,324
Trading securities sold, but not yet purchased	369,886	266,833
Securities sold, but not yet purchased	22,194	19,223
Derivative contracts	22,455	24,877
Senior notes	185,034
Debentures to Stifel Financial Capital Trusts	53,517	67,594
Liabilities subordinated to the claims of general creditors	$ 5,162	$ 6,671

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Securities Sold But Not Yet Purchased

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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Amount of subordinated debt obligations (also known as subordinated loan, subordinated bond, subordinated debenture or junior debt) which has a priority ranking after other debts in a dissolution, measured at fair value.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_UnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant