Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 4,533,174	$ 4,503,450
Tier 1 capital, Actual Ratio	0.187	0.183
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,457,282	$ 1,476,179
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,943,042	$ 1,968,239
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08	0.08
Total capital, Actual Amount	$ 4,729,164	$ 4,717,659
Total capital, Actual Ratio	0.195	0.192
Total capital For Capital Adequacy Purposes, Amount	$ 1,943,042	$ 1,968,239
Total capital For Capital Adequacy Purposes, Ratio	0.08	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,428,803	$ 2,460,299
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10	0.10
Tier 1 leverage, Actual Amount	$ 4,533,174	$ 4,503,450
Tier 1 leverage, Actual Ratio	0.114	0.114
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,588,978	$ 1,576,603
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,986,223	$ 1,970,753
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.05	0.05
Stifel Financial Corp. [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,848,174	$ 3,818,450
Tier 1 capital, Actual Ratio	0.158	0.155
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,092,961	$ 1,107,134
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	$ 1,578,722	$ 1,599,194
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	$ 1,353,799	$ 1,328,266
Tier 1 capital, Actual Ratio	0.115	0.112
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 709,406	$ 712,588
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 945,874	$ 950,118
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08	0.08
Total capital, Actual Amount	$ 1,448,881	$ 1,438,847
Total capital, Actual Ratio	0.123	0.121
Total capital For Capital Adequacy Purposes, Amount	$ 945,874	$ 950,118
Total capital For Capital Adequacy Purposes, Ratio	0.08	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,182,343	$ 1,187,647
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10	0.10
Tier 1 leverage, Actual Amount	$ 1,353,799	$ 1,328,266
Tier 1 leverage, Actual Ratio	0.071	0.07
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 766,876	$ 756,723
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 958,595	$ 945,904
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.05	0.05
Stifel Bank & Trust [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 1,353,799	$ 1,328,266
Tier 1 capital, Actual Ratio	0.115	0.112
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 532,054	$ 534,441
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	$ 768,523	$ 771,971
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	$ 839,275	$ 854,826
Tier 1 capital, Actual Ratio	0.117	0.118
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 430,743	$ 433,280
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 574,323	$ 577,707
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08	0.08
Total capital, Actual Amount	$ 887,037	$ 905,308
Total capital, Actual Ratio	0.124	0.125
Total capital For Capital Adequacy Purposes, Amount	$ 574,323	$ 577,707
Total capital For Capital Adequacy Purposes, Ratio	0.08	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 717,904	$ 722,134
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10	0.10
Tier 1 leverage, Actual Amount	$ 839,275	$ 854,826
Tier 1 leverage, Actual Ratio	0.07	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 477,107	$ 481,165
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 596,383	$ 601,456
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.05	0.05
Stifel Bank [Member] \| Common Stock [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 839,275	$ 854,826
Tier 1 capital, Actual Ratio	0.117	0.118
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 323,057	$ 324,960
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	$ 466,638	$ 469,387
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.065	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
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-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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