Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Tier 1 capital, Actual Amount	$ 3,913,952
Tier 1 capital, Actual Ratio	0.169
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,393,131
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,857,509
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 4,136,017
Total capital, Actual Ratio	0.178
Total capital For Capital Adequacy Purposes, Amount	$ 1,857,509
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 2,321,886
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 3,913,952
Tier 1 leverage, Actual Ratio	0.108
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 1,454,233
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,817,791
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	$ 3,228,952
Tier 1 capital, Actual Ratio	0.139
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 1,044,849
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,509,226
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	$ 1,489,819
Tier 1 capital, Actual Ratio	0.108
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 826,965
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,102,620
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 1,625,012
Total capital, Actual Ratio	0.118
Total capital For Capital Adequacy Purposes, Amount	$ 1,102,620
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,378,275
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 1,489,819
Tier 1 leverage, Actual Ratio	0.077
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 774,198
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.04
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 967,748
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	$ 1,489,819
Tier 1 capital, Actual Ratio	0.108
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 620,224
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 895,878
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	$ 690,456
Tier 1 capital, Actual Ratio	0.146
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 283,451
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.06
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 377,934
Tier 1 To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.08
Total capital, Actual Amount	$ 722,840
Total capital, Actual Ratio	0.153
Total capital For Capital Adequacy Purposes, Amount	$ 377,934
Total capital For Capital Adequacy Purposes, Ratio	0.08
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 472,418
Total capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.10
Tier 1 leverage, Actual Amount	$ 690,456
Tier 1 leverage, Actual Ratio	0.071
Tier 1 leverage For Capital Adequacy Purposes, Amount	$ 390,341
Tier 1 leverage For Capital Adequacy Purposes, Ratio	0.040
Tier 1 leverage To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 487,926
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	$ 690,456
Tier 1 capital, Actual Ratio	0.146
Tier 1 capital For Capital Adequacy Purposes, Amount	$ 212,588
Tier 1 capital For Capital Adequacy Purposes, Ratio	0.045
Tier 1 capital To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 307,071
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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-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
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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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