Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 4,116,336	$ 4,330,786
Tier 1 capital, Actual Ratio	0.175	0.182
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,415,284	$ 1,424,494
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,887,046	$ 1,899,326
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080	0.08
Total capital, Actual Amount	$ 4,340,889	$ 4,556,023
Total capital, Actual Ratio	0.184	0.192
Total capital For Capital Adequacy Purposes, Amount	$ 1,887,046	$ 1,899,326
Total capital For Capital Adequacy Purposes, Ratio	0.080	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,358,807	$ 2,374,157
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100	0.10
Tier 1 leverage, Actual Amount	$ 4,116,336	$ 4,330,786
Tier 1 leverage, Actual Ratio	0.108	0.114
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,520,531	$ 1,522,940
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,900,664	$ 1,903,675
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050	0.05
Stifel Financial Corp. [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,431,336	$ 3,645,786
Tier 1 capital, Actual Ratio	0.145	0.154
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,061,463	$ 1,068,371
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,533,224	$ 1,543,202
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065	0.065
Stifel Bank & Trust [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,337,013	$ 1,366,711
Tier 1 capital, Actual Ratio	0.115	0.111
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 698,658	$ 740,084
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 931,544	$ 986,778
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080	0.08
Total capital, Actual Amount	$ 1,454,352	$ 1,491,850
Total capital, Actual Ratio	0.125	0.121
Total capital For Capital Adequacy Purposes, Amount	$ 931,544	$ 986,778
Total capital For Capital Adequacy Purposes, Ratio	0.080	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,164,430	$ 1,233,473
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100	0.10
Tier 1 leverage, Actual Amount	$ 1,337,013	$ 1,366,711
Tier 1 leverage, Actual Ratio	0.07	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 760,447	$ 774,495
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 950,559	$ 968,118
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050	0.05
Stifel Bank & Trust [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,337,013	$ 1,366,711
Tier 1 capital, Actual Ratio	0.115	0.111
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 523,994	$ 555,063
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 756,880	$ 801,758
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065	0.065
Stifel Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 810,648	$ 768,652
Tier 1 capital, Actual Ratio	0.122	0.13
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 398,638	$ 355,236
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.060	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 531,517	$ 473,648
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.080	0.08
Total capital, Actual Amount	$ 859,871	$ 812,857
Total capital, Actual Ratio	0.129	0.137
Total capital For Capital Adequacy Purposes, Amount	$ 531,517	$ 473,648
Total capital For Capital Adequacy Purposes, Ratio	0.080	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 664,396	$ 592,060
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.100	0.10
Tier 1 leverage, Actual Amount	$ 810,648	$ 768,652
Tier 1 leverage, Actual Ratio	0.071	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 454,900	$ 433,925
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 568,625	$ 542,407
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.050	0.05
Stifel Bank [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 810,648	$ 768,652
Tier 1 capital, Actual Ratio	0.122	0.13
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 298,978	$ 266,427
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 431,857	$ 384,839
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065	0.065

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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/1943274/2147477270/942-505-50-1B

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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