Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 1,541,670
Common equity tier 1, Actual Ratio	29.40%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 315,001
Common equity tier 1, For Capital Adequacy Purposes Ratio	6.00%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 420,001
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%
Total capital, Actual Amount	$ 1,565,695
Total capital, Actual Ratio	29.80%
Total capital, For Capital Adequacy Purposes Amount	$ 420,001
Total capital, For Capital Adequacy Purposes Ratio	8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 525,001
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 leverage, Actual Amount	$ 1,541,670
Tier 1 leverage, Actual Ratio	18.30%
Tier 1 leverage, For Capital Adequacy Purposes Amount	$ 337,884
Tier 1 leverage, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 422,355
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%
Stifel Financial Corp. [Member] | Common Stock
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 1,565,695
Common equity tier 1, Actual Ratio	29.80%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 236,251
Common equity tier 1, For Capital Adequacy Purposes Ratio	4.50%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 341,251
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%
Stifel Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 447,907
Common equity tier 1, Actual Ratio	17.20%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 147,820
Common equity tier 1, For Capital Adequacy Purposes Ratio	6.00%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 197,093
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%
Total capital, Actual Amount	$ 423,984
Total capital, Actual Ratio	18.20%
Total capital, For Capital Adequacy Purposes Amount	$ 197,093
Total capital, For Capital Adequacy Purposes Ratio	8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 246,367
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 leverage, Actual Amount	$ 447,907
Tier 1 leverage, Actual Ratio	8.10%
Tier 1 leverage, For Capital Adequacy Purposes Amount	$ 209,098
Tier 1 leverage, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 261,373
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%
Stifel Bank [Member] | Common Stock
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 423,984
Common equity tier 1, Actual Ratio	17.20%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 110,865
Common equity tier 1, For Capital Adequacy Purposes Ratio	4.50%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 160,138
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%