Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Stifel Financial Corp. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual Amount	$ 1,406,221
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	443,234
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	554,043
Tier 1 capital to risk-weighted assets, Actual Amount	1,385,351
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	221,617
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	332,426
Tier 1 capital to adjusted average total assets, Actual Amount	1,385,351
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	336,160
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	420,200
Total capital to risk-weighted assets, Actual Ratio	25.40%
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	25.00%
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	16.50%
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	443,727
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	261,881
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	327,351
Tier 1 capital to risk-weighted assets, Actual Amount	422,996
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	130,940
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	196,410
Tier 1 capital to adjusted average total assets, Actual Amount	422,996
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	203,940
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 254,925
Total capital to risk-weighted assets, Actual Ratio	13.60%
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	12.90%
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	8.30%
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%