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Fair Value Of Financial Instruments (Estimated Fair Values Of Financial Instruments Not Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities purchased under agreements to resell |  | $ 412,367 | $ 348,162
Held-to-maturity securities | [1] | 5,811,600 | 5,738,418
Securities sold under agreements to repurchase |  | 408,950 | 212,011
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  | 2,766,483 | 2,198,335
Cash segregated for regulatory purposes |  | 33,399 | 29,017
Securities purchased under agreements to resell |  | 412,367 | 348,162
Held-to-maturity securities |  | 5,811,600 | 5,738,418
Bank loans |  | 19,353,782 | 19,752,043
Loans held for sale |  | 142,617 | 156,912
Securities sold under agreements to repurchase |  | 408,950 | 212,011
Bank deposits |  | 25,358,517 | 24,274,224
Senior notes |  | 1,020,868 | 1,016,755
Debentures to Stifel Financial Capital Trusts |  | 58,262 | 53,385
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  | 2,766,483 | 2,198,335
Cash segregated for regulatory purposes |  | 33,399 | 29,017
Securities purchased under agreements to resell |  | 0 | 218,515
Held-to-maturity securities |  | 0 |
Bank loans |  | 0 |
Loans held for sale |  | 0 |
Securities sold under agreements to repurchase |  | 0 |
Bank deposits |  | 0 |
Senior notes |  | 1,020,868 | 1,016,755
Debentures to Stifel Financial Capital Trusts |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  | 0 |
Cash segregated for regulatory purposes |  | 0 |
Securities purchased under agreements to resell |  | 412,367 | 129,647
Held-to-maturity securities |  | 5,717,202 | 5,624,042
Bank loans |  | 19,353,782 | 19,752,043
Loans held for sale |  | 142,617 | 156,912
Securities sold under agreements to repurchase |  | 408,950 | 212,011
Bank deposits |  | 25,358,517 | 24,274,224
Senior notes |  | 0 |
Debentures to Stifel Financial Capital Trusts |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  | 0 |
Cash segregated for regulatory purposes |  | 0 |
Securities purchased under agreements to resell |  | 0 |
Held-to-maturity securities |  | 94,398 | 114,376
Bank loans |  | 0 |
Loans held for sale |  | 0 |
Securities sold under agreements to repurchase |  | 0 |
Bank deposits |  | 0 |
Senior notes |  | 0 |
Debentures to Stifel Financial Capital Trusts |  | $ 58,262 | $ 53,385
[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.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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