Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($)		Dec. 31, 2022		Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell		$ 348,162,000		$ 579,866,000
Financial instruments owned		731,752,000		1,157,004,000
Available-for-sale securities		1,636,041,000	[1]	2,113,893,000
Held-to-maturity securities	[2]	5,738,418,000		5,343,481,000
Derivative contracts		142,042,000	[3]	52,129,000	[4]
Securities sold under agreements to repurchase		212,011,000		385,528,000
Financial instruments sold, but not yet purchased, at fair value		454,817,000		756,150,000
Federal Home Loan Bank advances		0
Senior notes		1,114,554,000		1,113,478,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,199,985,000		1,963,326,000
Cash segregated for regulatory purposes		29,017,000		186,331,000
Securities purchased under agreements to resell		348,162,000		579,866,000
Financial instruments owned		731,752,000		1,157,004,000
Available-for-sale securities		1,636,041,000		2,113,893,000
Held-to-maturity securities		5,990,451,000		5,348,558,000
Bank loans		20,465,092,000		16,627,847,000
Loans held for sale		156,912,000		207,715,000
Investments		99,376,000		117,804,000
Derivative contracts	[5]	142,042,000		52,129,000
Securities sold under agreements to repurchase		212,011,000		385,528,000
Bank deposits		27,117,111,000		23,280,348,000
Financial instruments sold, but not yet purchased, at fair value		454,817,000		756,150,000
Senior notes		1,114,554,000		1,113,478,000
Debentures to Stifel Financial Capital Trusts		60,000,000		60,000,000
Derivative Liabilities	[6]	142,028,000		52,147,000
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,199,985,000		1,963,326,000
Cash segregated for regulatory purposes		29,017,000		186,331,000
Securities purchased under agreements to resell		348,162,000		579,866,000
Financial instruments owned		731,752,000		1,157,004,000
Available-for-sale securities		1,636,041,000		2,113,893,000
Held-to-maturity securities		5,738,418,000		5,343,481,000
Bank loans		19,752,043,000		16,704,912,000
Loans held for sale		156,912,000		207,715,000
Investments		99,376,000		117,804,000
Derivative contracts	[5]	142,042,000		52,129,000
Securities sold under agreements to repurchase		212,011,000		385,528,000
Bank deposits		24,274,224,000		22,998,842,000
Financial instruments sold, but not yet purchased, at fair value		454,817,000		756,150,000
Senior notes		1,016,755,000		1,218,344,000
Debentures to Stifel Financial Capital Trusts		53,385,000		46,340,000
Derivative Liabilities	[6]	$ 142,028,000		$ 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

[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.