Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Stifel Financial Corp. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual Amount	$ 1,173,218
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	391,432
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	489,291
Tier 1 capital to risk-weighted assets, Actual Amount	1,159,823
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	195,716
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	293,574
Tier 1 capital to adjusted average total assets, Actual Amount	1,159,823
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	314,160
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	392,700
Total capital to risk-weighted assets, Actual Ratio	24.00%
Total capital to risk-weighted assets, For Capital Adequacy Purposes Ratio	8.00%
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 capital to risk-weighted assets, Actual Ratio	23.70%
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%
Tier 1 capital to adjusted average total assets, Actual Ratio	14.80%
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%
Stifel Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual Amount	329,763
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	197,462
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	246,828
Tier 1 capital to risk-weighted assets, Actual Amount	316,530
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	98,731
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	148,097
Tier 1 capital to adjusted average total assets, Actual Amount	316,530
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	176,992
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 221,240
Total capital to risk-weighted assets, Actual Ratio	13.40%
Total capital to risk-weighted assets, For Capital Adequacy Purposes Ratio	8.00%
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%
Tier 1 capital to risk-weighted assets, Actual Ratio	12.80%
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%
Tier 1 capital to adjusted average total assets, Actual Ratio	7.20%
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Ratio	4.00%
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%