Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,915,965
Tier 1 capital, Actual Ratio	0.172
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,364,893
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,819,857
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 4,129,814
Total capital, Actual Ratio	0.182
Total capital For Capital Adequacy Purposes, Amount	$ 1,819,857
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,274,822
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 3,915,965
Tier 1 leverage, Actual Ratio	0.105
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,498,042
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,872,552
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	$ 3,230,965
Tier 1 capital, Actual Ratio	0.142
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,023,670
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,478,634
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	$ 1,344,589
Tier 1 capital, Actual Ratio	0.118
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 681,916
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 909,222
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 1,464,939
Total capital, Actual Ratio	0.129
Total capital For Capital Adequacy Purposes, Amount	$ 909,222
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,136,527
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 1,344,589
Tier 1 leverage, Actual Ratio	0.073
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 740,724
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 925,905
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	$ 1,344,589
Tier 1 capital, Actual Ratio	0.118
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 511,437
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 738,743
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	$ 788,811
Tier 1 capital, Actual Ratio	0.119
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 397,374
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 529,831
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 827,822
Total capital, Actual Ratio	0.125
Total capital For Capital Adequacy Purposes, Amount	$ 529,831
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 662,289
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 788,811
Tier 1 leverage, Actual Ratio	0.072
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 440,792
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 550,990
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	$ 788,811
Tier 1 capital, Actual Ratio	0.119
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 298,030
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 430,488
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/2009/role/commonPracticeRef
-Topic 942
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-Section 50
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-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

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

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