Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2023		Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell		$ 542,582		$ 348,162
Financial instruments owned		1,144,898		731,752
Available-for-sale securities		1,582,418		1,636,041
Held-to-maturity securities	[1]	5,789,788		5,738,418
Derivative contracts, Assets		136,112	[2]	142,042	[3]
Securities sold under agreements to repurchase		318,321		212,011
Financial instruments sold, but not yet purchased, at fair value		665,487		454,817
Senior notes		1,115,091		1,114,554
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1,907,926		2,199,985
Cash segregated for regulatory purposes		21,372		29,017
Securities purchased under agreements to resell		542,582		348,162
Financial instruments owned		1,144,898		731,752
Available-for-sale securities		1,582,418		1,636,041
Held-to-maturity securities		5,951,482		5,990,451
Bank loans		20,338,475		20,465,092
Loans held for sale		224,017		156,912
Investments		100,779		99,376
Derivative contracts, Assets		136,112	[2]	142,042	[4]
Securities sold under agreements to repurchase		318,321		212,011
Bank deposits		27,004,807		27,117,111
Financial instruments sold, but not yet purchased, at fair value		665,487		454,817
Senior notes		1,115,091		1,114,554
Debentures to Stifel Financial Capital Trusts		60,000		60,000
Derivative contracts		136,099	[5]	142,028	[6]
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1,907,926		2,199,985
Cash segregated for regulatory purposes		21,372		29,017
Securities purchased under agreements to resell		542,582		348,162
Financial instruments owned		1,144,898		731,752
Available-for-sale securities		1,582,418		1,636,041
Held-to-maturity securities		5,789,788		5,738,418
Bank loans		19,460,855		19,752,043
Loans held for sale		224,017		156,912
Investments		100,779		99,376
Derivative contracts, Assets		136,112	[2]	142,042	[4]
Securities sold under agreements to repurchase		318,321		212,011
Bank deposits		24,575,014		24,274,224
Financial instruments sold, but not yet purchased, at fair value		665,487		454,817
Senior notes		1,033,723		1,016,755
Debentures to Stifel Financial Capital Trusts		52,511		53,385
Derivative contracts		$ 136,099	[5]	$ 142,028	[6]

[1] 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.

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

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

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