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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 | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities purchased under agreements to resell |  | $ 439,539 | $ 349,849
Held-to-maturity securities | [1] | 6,074,257 | 5,852,176
Securities sold under agreements to repurchase |  | 594,820 | 417,644
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  | 2,613,996 | 3,357,095
Cash segregated for regulatory purposes |  | 41,290 | 162,048
Securities purchased under agreements to resell |  | 439,539 | 349,849
Held-to-maturity securities |  | 6,074,257 | 5,852,176
Bank loans |  | 18,418,965 | 18,259,923
Loans held for sale |  | 472,804 | 423,999
Securities sold under agreements to repurchase |  | 594,820 | 417,644
Bank deposits |  | 25,222,469 | 25,326,174
Senior notes |  | 1,058,131 | 1,041,217
Debentures to Stifel Financial Capital Trusts |  | 56,975 | 55,507
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash |  | 2,613,996 | 3,357,095
Cash segregated for regulatory purposes |  | 41,290 | 162,048
Senior notes |  | 1,058,131 | 1,041,217
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities purchased under agreements to resell |  | 439,539 | 349,849
Held-to-maturity securities |  | 5,980,647 | 5,758,130
Bank loans |  | 18,418,965 | 18,259,923
Loans held for sale |  | 472,804 | 423,999
Securities sold under agreements to repurchase |  | 594,820 | 417,644
Bank deposits |  | 25,222,469 | 25,326,174
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Held-to-maturity securities |  | 93,610 | 94,046
Debentures to Stifel Financial Capital Trusts |  | $ 56,975 | $ 55,507
[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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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