Regulatory Capital Requirements (Schedule of Total Risk-Based, Tier 1 Risk-Based, and Tier 1 Leverage Ratios) (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,964,013
Tier 1 capital, Actual Ratio	0.170
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,398,007
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,864,010
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 4,155,304
Total capital, Actual Ratio	0.178
Total capital For Capital Adequacy Purposes, Amount	$ 1,864,010
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,330,012
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 3,964,013
Tier 1 leverage, Actual Ratio	0.111
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,424,787
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,780,983
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	$ 3,279,013
Tier 1 capital, Actual Ratio	0.141
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,048,505
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,514,508
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	$ 1,655,760
Tier 1 capital, Actual Ratio	0.108
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 924,379
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,232,506
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 1,775,586
Total capital, Actual Ratio	0.115
Total capital For Capital Adequacy Purposes, Amount	$ 1,232,506
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,540,632
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 1,655,760
Tier 1 leverage, Actual Ratio	0.073
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 901,134
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,126,417
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	$ 1,655,760
Tier 1 capital, Actual Ratio	0.108
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 693,285
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,001,411
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	$ 377,572
Tier 1 capital, Actual Ratio	0.105
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 215,474
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 287,298
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 392,228
Total capital, Actual Ratio	0.109
Total capital For Capital Adequacy Purposes, Amount	$ 287,298
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 359,123
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 377,572
Tier 1 leverage, Actual Ratio	0.073
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 207,546
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 259,433
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	$ 377,572
Tier 1 capital, Actual Ratio	0.105
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 161,605
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 233,430
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)
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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-Name Accounting Standards Codification
-Topic 942
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-Section 50
-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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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

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