Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014 Stifel Financial Corp. [Member]	Sep. 30, 2013 Stifel Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual Amount	$ 1,278,259	$ 383,367
Total capital to risk-weighted assets, For Capital Adequacy Purposes Amount	393,702	226,087
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	492,128	282,608
Tier 1 capital to risk-weighted assets, Actual Amount	1,263,966	369,236
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Amount	196,851	113,043
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	295,277	169,565
Tier 1 capital to adjusted average total assets, Actual Amount	1,263,966	369,236
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Amount	334,407	201,592
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 418,009	$ 251,990
Total capital to risk-weighted assets, Actual Ratio	26.00%	13.80%
Total capital to risk-weighted assets, For Capital Adequacy Purposes Ratio	8.00%	8.00%
Total capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets, Actual Ratio	25.70%	13.10%
Tier 1 capital to risk-weighted assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 capital to risk-weighted assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%	6.00%
Tier 1 capital to adjusted average total assets, Actual Ratio	15.10%	7.30%
Tier 1 capital to adjusted average total assets, For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 capital to adjusted average total assets, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%