Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,910,964
Tier 1 capital, Actual Ratio	0.173
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,355,300
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,807,066
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 4,130,093
Total capital, Actual Ratio	0.183
Total capital For Capital Adequacy Purposes, Amount	$ 1,807,066
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,258,833
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 3,910,964
Tier 1 leverage, Actual Ratio	0.106
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,480,733
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,850,917
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.05
Stifel Financial Corp. [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,225,964
Tier 1 capital, Actual Ratio	0.143
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,016,475
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,468,241
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	$ 1,242,565
Tier 1 capital, Actual Ratio	0.108
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 690,139
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 920,185
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 1,367,153
Total capital, Actual Ratio	0.119
Total capital For Capital Adequacy Purposes, Amount	$ 920,185
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,150,231
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 1,242,565
Tier 1 leverage, Actual Ratio	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 700,273
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 875,342
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.05
Stifel Bank & Trust [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,242,565
Tier 1 capital, Actual Ratio	0.108
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 517,604
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 747,650
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	$ 838,002
Tier 1 capital, Actual Ratio	0.148
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 339,824
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 453,098
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 876,227
Total capital, Actual Ratio	0.155
Total capital For Capital Adequacy Purposes, Amount	$ 453,098
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 566,373
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 838,002
Tier 1 leverage, Actual Ratio	0.072
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 467,975
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 584,969
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.05
Stifel Bank [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 838,002
Tier 1 capital, Actual Ratio	0.148
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 254,868
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 368,142
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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
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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/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

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-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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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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