Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell		$ 642,850	$ 528,976
Financial instruments owned		1,419,156	1,169,008
Available-for-sale securities		1,613,304	1,584,598
Held-to-maturity securities	[1]	6,713,101	6,547,647
Securities sold under agreements to repurchase		684,561	580,170
Financial instruments sold, but not yet purchased, at fair value		825,488	646,271
Federal Home Loan Bank advances		0
Senior notes		616,824	616,618
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,725,992	2,648,308
Cash segregated for regulatory purposes		28,065	29,895
Securities purchased under agreements to resell		642,850	528,976
Financial instruments owned		1,419,156	1,169,008
Available-for-sale securities		1,613,304	1,584,598
Held-to-maturity securities		6,716,753	6,524,954
Bank loans		20,225,273	20,731,796
Loans held for sale		1,016,127	578,980
Investments		75,459	75,358
Derivative contracts, Assets	[2]	91,048	110,814
Securities sold under agreements to repurchase		684,561	580,170
Bank deposits		29,639,272	29,102,227
Financial instruments sold, but not yet purchased, at fair value		825,488	646,271
Senior notes		616,824	616,618
Debentures to Stifel Financial Capital Trusts		60,000	60,000
Derivative contracts	[3]	91,061	110,825
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,725,992	2,648,308
Cash segregated for regulatory purposes		28,065	29,895
Securities purchased under agreements to resell		642,850	528,976
Financial instruments owned		1,419,156	1,169,008
Available-for-sale securities		1,613,304	1,584,598
Held-to-maturity securities		6,713,101	6,547,647
Bank loans		19,634,492	20,229,458
Loans held for sale		1,016,127	578,980
Investments		75,459	75,358
Derivative contracts, Assets	[2]	91,048	110,814
Securities sold under agreements to repurchase		684,561	580,170
Bank deposits		27,838,167	27,164,580
Financial instruments sold, but not yet purchased, at fair value		825,488	646,271
Senior notes		563,406	561,851
Debentures to Stifel Financial Capital Trusts		57,063	58,788
Derivative contracts	[3]	$ 91,061	$ 110,825

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