Fair Value Of Financial Instruments (Schedule Of Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities purchased under agreements to resell	[1]	$ 624,049	$ 699,900
Financial instruments owned		1,189,892	1,267,449
Available-for-sale securities		3,448,801	3,070,447
Held-to-maturity securities		2,855,791	4,122,907	[2]
Derivative contracts		1,416	7,683
Securities sold under agreements to repurchase	[3]	564,892	535,394
Bank deposits		14,836,646	15,863,613
Financial instruments sold, but not yet purchased, at fair value		905,797	947,306
Senior notes		1,016,751	1,015,973
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		868,866	1,936,560
Cash segregated for regulatory purposes		62,654	132,814
Securities purchased under agreements to resell		624,049	699,900
Financial instruments owned		1,189,892	1,267,449
Available-for-sale securities		3,448,801	3,070,447
Held-to-maturity securities		2,881,484	4,218,854
Bank loans		9,101,903	8,517,615
Loans held for sale		265,330	205,557
Investments		74,167	67,982
Derivative contracts		1,416	7,683
Securities sold under agreements to repurchase		564,892	535,394
Bank deposits		14,836,646	15,863,613
Financial instruments sold, but not yet purchased, at fair value		905,797	947,306
Federal Home Loan Bank advances		250,000	540,000
Borrowings		150	180,655
Senior notes		1,016,751	1,015,973
Debentures to Stifel Financial Capital Trusts		60,000	60,000
Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		868,866	1,936,560
Cash segregated for regulatory purposes		62,654	132,814
Securities purchased under agreements to resell		624,049	699,900
Financial instruments owned		1,189,892	1,267,449
Available-for-sale securities		3,448,801	3,070,447
Held-to-maturity securities		2,855,791	4,122,907
Bank loans		9,223,031	8,565,347
Loans held for sale		265,330	205,557
Investments		74,167	67,982
Derivative contracts		1,416	7,683
Securities sold under agreements to repurchase		564,892	535,394
Bank deposits		13,849,447	14,661,996
Financial instruments sold, but not yet purchased, at fair value		905,797	947,306
Federal Home Loan Bank advances		250,000	540,000
Borrowings		150	180,655
Senior notes		1,068,923	989,790
Debentures to Stifel Financial Capital Trusts		$ 43,570	$ 49,747

[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 $623.2 million and $695.6 million at September 30, 2019 and December 31, 2018, respectively.

[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] 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 $586.9 million and $558.6 million at September 30, 2019 and December 31, 2018, respectively.