Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Stifel Financial Corp. [Member]
Total capital to risk-weighted assets, Actual Amount	$ 984,110
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	302,524
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	378,155
Tier 1 capital to risk-weighted assets, Actual Amount	977,818
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	151,262
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	226,893
Tier 1 capital to adjusted average total assets, Actual Amount	977,818
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	201,703
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	252,129
Total capital to risk-weighted assets, Actual Ratio	26.00%
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	25.90%
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	19.40%
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]
Total capital to risk-weighted assets, Actual Amount	224,731
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	146,723
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	183,404
Tier 1 capital to risk-weighted assets, Actual Amount	218,439
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	73,362
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	110,042
Tier 1 capital to adjusted average total assets, Actual Amount	218,439
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	111,052
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 138,815
Total capital to risk-weighted assets, Actual Ratio	12.30%
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	11.90%
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	7.90%
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%