Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Stifel Financial Corp. [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity tier 1, Actual Amount	$ 1,431,187
Common equity tier 1, Actual Ratio	29.40%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 292,127
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	$ 389,502
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%
Total capital, Actual Amount	$ 1,459,683
Total capital, Actual Ratio	30.00%
Total capital, For Capital Adequacy Purposes Amount	$ 389,502
Total capital, For Capital Adequacy Purposes Ratio	8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 486,878
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 leverage, Actual Amount	$ 1,431,187
Tier 1 leverage, Actual Ratio	16.40%
Tier 1 leverage, For Capital Adequacy Purposes Amount	$ 348,017
Tier 1 leverage, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 435,022
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	$ 1,431,187
Common equity tier 1, Actual Ratio	29.40%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 219,095
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	$ 316,471
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	$ 368,273
Common equity tier 1, Actual Ratio	14.80%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 149,531
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	$ 199,375
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%
Total capital, Actual Amount	$ 395,980
Total capital, Actual Ratio	15.90%
Total capital, For Capital Adequacy Purposes Amount	$ 199,375
Total capital, For Capital Adequacy Purposes Ratio	8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 249,218
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 leverage, Actual Amount	$ 368,273
Tier 1 leverage, Actual Ratio	7.60%
Tier 1 leverage, For Capital Adequacy Purposes Amount	$ 193,442
Tier 1 leverage, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 241,802
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	$ 368,273
Common equity tier 1, Actual Ratio	14.80%
Common equity tier 1, For Capital Adequacy Purposes Amount	$ 112,148
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	$ 161,992
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%