Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2023		Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell		$ 349,849		$ 348,162
Financial instruments owned		918,741		731,752
Available-for-sale securities		1,551,686	[1]	1,636,041
Held-to-maturity securities	[2]	5,852,176		5,738,418
Derivative contracts, Assets		118,668	[3]	142,042	[4]
Securities sold under agreements to repurchase		417,644		212,011
Financial instruments sold, but not yet purchased, at fair value		497,741		454,817
Senior notes		1,115,629		1,114,554
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		3,361,801		2,199,985
Cash segregated for regulatory purposes		162,048		29,017
Securities purchased under agreements to resell		349,849		348,162
Financial instruments owned		918,741		731,752
Available-for-sale securities		1,551,686		1,636,041
Held-to-maturity securities		5,888,798		5,990,451
Bank loans		19,305,805		20,465,092
Loans held for sale		423,999		156,912
Investments		91,105		99,376
Derivative contracts, Assets	[5]	118,668		142,042
Securities sold under agreements to repurchase		417,644		212,011
Bank deposits		27,334,579		27,117,111
Financial instruments sold, but not yet purchased, at fair value		497,741		454,817
Senior notes		1,115,629		1,114,554
Debentures to Stifel Financial Capital Trusts		60,000		60,000
Derivative contracts	[6]	118,651		142,028
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		3,361,801		2,199,985
Cash segregated for regulatory purposes		162,048		29,017
Securities purchased under agreements to resell		349,849		348,162
Financial instruments owned		918,741		731,752
Available-for-sale securities		1,551,686		1,636,041
Held-to-maturity securities		5,852,176		5,738,418
Bank loans		18,259,923		19,752,043
Loans held for sale		423,999		156,912
Investments		91,105		99,376
Derivative contracts, Assets	[5]	118,668		142,042
Securities sold under agreements to repurchase		417,644		212,011
Bank deposits		25,326,174		24,274,224
Financial instruments sold, but not yet purchased, at fair value		497,741		454,817
Senior notes		1,041,217		1,016,755
Debentures to Stifel Financial Capital Trusts		55,507		53,385
Derivative contracts	[6]	$ 118,651		$ 142,028

[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.