Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,965,309
Tier 1 capital, Actual Ratio	0.168
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,412,013
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,882,684
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 4,170,458
Total capital, Actual Ratio	0.177
Total capital For Capital Adequacy Purposes, Amount	$ 1,882,684
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,353,356
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 3,965,309
Tier 1 leverage, Actual Ratio	0.109
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,456,604
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,820,755
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	$ 3,280,309
Tier 1 capital, Actual Ratio	0.139
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,059,010
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,529,681
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	$ 1,590,068
Tier 1 capital, Actual Ratio	0.110
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 867,724
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,156,965
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 1,713,883
Total capital, Actual Ratio	0.119
Total capital For Capital Adequacy Purposes, Amount	$ 1,156,965
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,446,207
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 1,590,068
Tier 1 leverage, Actual Ratio	0.075
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 845,785
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,057,231
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	$ 1,590,068
Tier 1 capital, Actual Ratio	0.110
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 650,793
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 940,034
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	$ 596,152
Tier 1 capital, Actual Ratio	0.131
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 272,897
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 363,863
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080
Total capital, Actual Amount	$ 622,998
Total capital, Actual Ratio	0.137
Total capital For Capital Adequacy Purposes, Amount	$ 363,863
Total capital For Capital Adequacy Purposes, Ratio	0.080
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 454,829
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100
Tier 1 leverage, Actual Amount	$ 596,152
Tier 1 leverage, Actual Ratio	0.075
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 319,780
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 399,725
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	$ 596,152
Tier 1 capital, Actual Ratio	0.131
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 204,673
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 295,639
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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-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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Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

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