Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,623,954
Tier 1 capital, Actual Ratio	0.187
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,161,979
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,549,306
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 3,788,860
Total capital, Actual Ratio	0.196
Total capital For Capital Adequacy Purposes, Amount	$ 1,549,306
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,936,632
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 3,623,954
Tier 1 leverage, Actual Ratio	0.117
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,237,181
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,546,477
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050
Stifel Financial Corp. [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 2,938,954
Tier 1 capital, Actual Ratio	0.152
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 871,484
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,258,811
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065
Stifel Bank & Trust [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,274,994
Tier 1 capital, Actual Ratio	0.106
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 720,080
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 960,106
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 1,380,984
Total capital, Actual Ratio	0.115
Total capital For Capital Adequacy Purposes, Amount	$ 960,106
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,200,133
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 1,274,994
Tier 1 leverage, Actual Ratio	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 720,241
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 900,301
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050
Stifel Bank & Trust [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,274,994
Tier 1 capital, Actual Ratio	0.106
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 540,060
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 780,086
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065
Stifel Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 302,231
Tier 1 capital, Actual Ratio	0.138
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 131,833
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 175,777
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 310,902
Total capital, Actual Ratio	0.141
Total capital For Capital Adequacy Purposes, Amount	$ 175,777
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 219,722
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 302,231
Tier 1 leverage, Actual Ratio	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 171,158
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 213,947
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050
Stifel Bank [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 302,231
Tier 1 capital, Actual Ratio	0.138
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 98,875
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 142,819
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065

Amount of total capital as defined by regulatory framework.

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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-Paragraph 1B
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Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 942
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-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Amount of Tier 1 leverage capital as defined by regulatory framework.

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Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

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