Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell	[1]	$ 478,091	$ 248,588
Financial instruments owned		1,063,651	925,045
Available-for-sale securities		3,455,373	3,181,313
Held-to-maturity securities	[2]	3,321,880	3,040,554
Investments, at fair value		128,332	133,563
Derivative contracts		8,442	10,390
Securities sold under agreements to repurchase	[3]	243,999	268,546
Bank deposits		12,050,474	11,527,483
Financial instruments sold, but not yet purchased, at fair value		705,577	699,032
Derivative contracts		939	1,823
Borrowings		105,000	377,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		678,054	912,932
Cash segregated for regulatory purposes		150	73,235
Securities purchased under agreements to resell		478,091	248,588
Financial instruments owned		1,063,651	925,045
Available-for-sale securities		3,455,373	3,181,313
Held-to-maturity securities		3,307,970	3,038,405
Loans held for sale		139,676	228,588
Bank loans		6,160,093	5,591,190
Investments, at fair value		128,332	133,563
Derivative contracts		8,442	10,390
Securities sold under agreements to repurchase		243,999	268,546
Bank deposits		12,050,474	11,527,483
Financial instruments sold, but not yet purchased, at fair value		705,577	699,032
Derivative contracts		939	1,823
Federal Home Loan Bank advances		790,000	500,000
Borrowings		105,000	377,000
Senior notes		796,296	795,891
Debentures to Stifel Financial Capital Trusts		67,500	67,500
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		678,054	912,932
Cash segregated for regulatory purposes		150	73,235
Securities purchased under agreements to resell		478,091	248,588
Financial instruments owned		1,063,651	925,045
Available-for-sale securities		3,455,373	3,181,313
Held-to-maturity securities		3,321,880	3,040,554
Loans held for sale		139,676	228,588
Bank loans		5,994,527	5,633,804
Investments, at fair value		128,332	133,563
Derivative contracts		8,442	10,390
Securities sold under agreements to repurchase		243,999	268,546
Bank deposits		11,366,970	11,092,185
Financial instruments sold, but not yet purchased, at fair value		705,577	699,032
Derivative contracts		939	1,823
Federal Home Loan Bank advances		790,000	500,000
Borrowings		105,000	377,000
Senior notes		811,318	799,632
Debentures to Stifel Financial Capital Trusts		$ 50,413	$ 52,525

[1] Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $474.1 million and $248.5 million at June 30, 2017 and December 31, 2016, respectively.

[2] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.

[3] Collateral pledged includes the fair value of securities pledged by our company to the counter party. These securities are included on the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counter party includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $263.8 million and $299.3 million at June 30, 2017 and December 31, 2016, respectively.