Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		$ 1,356,353
Cash segregated for regulatory purposes		196,950
Securities purchased under agreements to resell	[1]	458,968	$ 385,008
Financial instruments owned		932,511	972,932
Available-for-sale securities		3,366,090	3,254,737
Held-to-maturity securities		2,697,830	2,827,883
Bank loans		10,017,518
Loans held for sale		570,787
Derivative contracts			1,086
Securities sold under agreements to repurchase	[2]	475,528	391,634
Bank deposits		16,076,448
Financial instruments sold, but not yet purchased, at fair value		668,795	662,852
Federal Home Loan Bank advances		250,000
Borrowings		198,150
Senior notes		1,017,269	1,017,010
Debentures to Stifel Financial Capital Trusts		37,860
Derivative contracts		1,262
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1,382,920	1,142,596
Cash segregated for regulatory purposes		196,950	131,374
Securities purchased under agreements to resell		458,968	385,008
Financial instruments owned		932,511	972,932
Available-for-sale securities		3,366,090	3,254,737
Held-to-maturity securities		3,085,824	2,856,219
Bank loans		9,994,500	9,624,042
Loans held for sale		570,787	389,693
Investments		55,688	79,972
Derivative contracts	[3]		1,086
Securities sold under agreements to repurchase		475,528	391,634
Bank deposits		16,880,933	15,332,581
Financial instruments sold, but not yet purchased, at fair value		668,795	662,852
Federal Home Loan Bank advances		250,000	250,000
Borrowings		198,150	150
Senior notes		1,017,269	1,017,010
Debentures to Stifel Financial Capital Trusts		60,000	60,000
Derivative contracts	[4]	1,262
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1,382,920	1,142,596
Cash segregated for regulatory purposes		196,950	131,374
Securities purchased under agreements to resell		458,968	385,008
Financial instruments owned		932,511	972,932
Available-for-sale securities		3,366,090	3,254,737
Held-to-maturity securities		2,697,830	2,827,883
Bank loans		10,017,518	9,801,986
Loans held for sale		570,787	389,693
Investments		55,688	79,972
Derivative contracts	[3]		1,086
Securities sold under agreements to repurchase		475,528	391,634
Bank deposits		16,076,448	14,467,894
Financial instruments sold, but not yet purchased, at fair value		668,795	662,852
Federal Home Loan Bank advances		250,000	250,000
Borrowings		198,150	150
Senior notes		1,016,578	1,069,425
Debentures to Stifel Financial Capital Trusts		37,860	$ 45,847
Derivative contracts	[4]	$ 1,262

[1] Collateral received includes securities received by our company from the counterparty. These securities are not included on the consolidated statements of financial condition unless there is an event of default. The fair value of securities pledged as collateral was $462.3 million and $385.3 million at March 31, 2020 and December 31, 2019, respectively.

[2] Collateral pledged includes the fair value of securities pledged by our company to the counterparty. These securities are included in the consolidated statements of financial condition unless we default. Collateral pledged by our company to the counterparty includes U.S. government agency securities, U.S. government securities, and corporate fixed income securities with market values of $494.8 million and $407.3 million at March 31, 2020 and December 31, 2019, respectively.

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

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