Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2024		Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell		$ 439,539		$ 349,849
Financial instruments owned		1,261,216		918,741
Available-for-sale securities, Fair Value		1,583,477	[1]	1,551,686
Held-to-maturity securities	[2]	6,074,257		5,852,176
Derivative contracts, Assets		127,177	[3]	118,668	[4]
Securities sold under agreements to repurchase		594,820		417,644
Financial instruments sold, but not yet purchased, at fair value		634,311		497,741
Senior notes		1,116,166		1,115,629
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,615,670		3,361,801
Cash segregated for regulatory purposes		41,290		162,048
Securities purchased under agreements to resell		439,539		349,849
Financial instruments owned		1,261,216		918,741
Available-for-sale securities, Fair Value		1,583,477		1,551,686
Held-to-maturity securities		6,059,267		5,888,798
Bank loans		19,346,967		19,305,805
Loans held for sale		472,804		423,999
Investments		91,465		91,105
Derivative contracts, Assets	[5]	127,177		118,668
Securities sold under agreements to repurchase		594,820		417,644
Bank deposits		27,139,753		27,334,579
Financial instruments sold, but not yet purchased, at fair value		634,311		497,741
Senior notes		1,116,166		1,115,629
Debentures to Stifel Financial Capital Trusts		60,000		60,000
Derivative contracts	[6]	127,156		118,651
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,615,670		3,361,801
Cash segregated for regulatory purposes		41,290		162,048
Securities purchased under agreements to resell		439,539		349,849
Financial instruments owned		1,261,216		918,741
Available-for-sale securities, Fair Value		1,583,477		1,551,686
Held-to-maturity securities		6,074,257		5,852,176
Bank loans		18,418,965		18,259,923
Loans held for sale		472,804		423,999
Investments		91,465		91,105
Derivative contracts, Assets	[5]	127,177		118,668
Securities sold under agreements to repurchase		594,820		417,644
Bank deposits		25,222,469		25,326,174
Financial instruments sold, but not yet purchased, at fair value		634,311		497,741
Senior notes		1,058,131		1,041,217
Debentures to Stifel Financial Capital Trusts		56,975		55,507
Derivative contracts	[6]	$ 127,156		$ 118,651

[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.

[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] Included in other assets in the consolidated statements of financial condition.

[4] Included in other assets in the consolidated statements of financial condition.

[5] Included in other assets in the consolidated statements of financial condition.

[6] Included in accounts payable and accrued expenses in the consolidated statements of financial condition.