Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Mar. 31, 2024		Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell		$ 451,056		$ 349,849
Financial instruments owned		1,230,855		918,741
Available-for-sale securities, Fair Value		1,499,982	[1]	1,551,686
Held-to-maturity securities		5,792,946		5,852,176	[2]
Derivative contracts, Assets		127,701	[3]	118,668	[4]
Securities sold under agreements to repurchase		426,659		417,644
Financial instruments sold, but not yet purchased, at fair value		682,279		497,741
Federal Home Loan Bank advances		0
Senior notes		1,115,897		1,115,629
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		3,408,528		3,361,801
Cash segregated for regulatory purposes		65,827		162,048
Securities purchased under agreements to resell		451,056		349,849
Financial instruments owned		1,230,855		918,741
Available-for-sale securities, Fair Value		1,499,982		1,551,686
Held-to-maturity securities		5,793,750		5,888,798
Bank loans		18,949,796		19,305,805
Loans held for sale		534,593		423,999
Investments		89,518		91,105
Derivative contracts, Assets	[5]	127,701		118,668
Securities sold under agreements to repurchase		426,659		417,644
Bank deposits		27,554,411		27,334,579
Financial instruments sold, but not yet purchased, at fair value		682,279		497,741
Senior notes		1,115,897		1,115,629
Debentures to Stifel Financial Capital Trusts		60,000		60,000
Derivative Liabilities	[6]	127,680		118,651
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		3,408,528		3,361,801
Cash segregated for regulatory purposes		65,827		162,048
Securities purchased under agreements to resell		451,056		349,849
Financial instruments owned		1,230,855		918,741
Available-for-sale securities, Fair Value		1,499,982		1,551,686
Held-to-maturity securities		5,792,946		5,852,176
Bank loans		17,981,705		18,259,923
Loans held for sale		534,593		423,999
Investments		89,518		91,105
Derivative contracts, Assets	[5]	127,701		118,668
Securities sold under agreements to repurchase		426,659		417,644
Bank deposits		25,540,594		25,326,174
Financial instruments sold, but not yet purchased, at fair value		682,279		497,741
Senior notes		1,073,265		1,041,217
Debentures to Stifel Financial Capital Trusts		57,520		55,507
Derivative Liabilities	[6]	$ 127,680		$ 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.