Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($)		Dec. 31, 2021		Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents				$ 2,245,082,000
Cash segregated for regulatory purposes				172,932,000
Securities purchased under agreements to resell		$ 579,866,000		217,930,000
Financial instruments owned		1,157,004,000		694,028,000
Available-for-sale securities		2,113,893,000	[1]	2,230,297,000
Held-to-maturity securities		5,343,481,000	[2]	4,107,960,000
Bank loans				11,088,058,000
Loans held for sale				551,248,000
Derivative contracts	[3]	52,129,000
Securities sold under agreements to repurchase		385,528,000		190,955,000
Bank deposits				17,192,722,000
Financial instruments sold, but not yet purchased, at fair value		756,150,000		437,978,000
Federal Home Loan Bank advances		0
Senior notes		1,113,478,000		1,112,409,000
Debentures to Stifel Financial Capital Trusts				41,071,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1,963,326,000		2,279,274,000
Cash segregated for regulatory purposes		186,331,000		172,932,000
Securities purchased under agreements to resell		579,866,000		217,930,000
Financial instruments owned		1,157,004,000		694,028,000
Available-for-sale securities		2,113,893,000		2,230,297,000
Held-to-maturity securities		5,348,558,000		4,117,384,000
Bank loans		16,627,847,000		11,006,760,000
Loans held for sale		207,715,000		551,248,000
Investments		117,804,000		113,862,000
Derivative contracts		52,129,000
Securities sold under agreements to repurchase		385,528,000		190,955,000
Bank deposits		23,280,348,000		17,396,497,000
Financial instruments sold, but not yet purchased, at fair value		756,150,000		437,978,000
Senior notes		1,113,478,000		1,112,409,000
Debentures to Stifel Financial Capital Trusts		60,000,000		60,000,000
Derivative contracts		52,147,000
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1,963,326,000		2,279,274,000
Cash segregated for regulatory purposes		186,331,000		172,932,000
Securities purchased under agreements to resell		579,866,000		217,930,000
Financial instruments owned		1,157,004,000		694,028,000
Available-for-sale securities		2,113,893,000		2,230,297,000
Held-to-maturity securities		5,343,481,000		4,107,960,000
Bank loans		16,704,912,000		11,088,058,000
Loans held for sale		207,715,000		551,248,000
Investments		117,804,000		113,862,000
Derivative contracts		52,129,000
Securities sold under agreements to repurchase		385,528,000		190,955,000
Bank deposits		22,998,842,000		17,192,722,000
Financial instruments sold, but not yet purchased, at fair value		756,150,000		437,978,000
Senior notes		1,218,344,000		1,265,669,000
Debentures to Stifel Financial Capital Trusts		46,340,000		$ 41,071,000
Derivative contracts		$ 52,147,000

[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.