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Regulatory Capital Requirements (Narrative) (Details) (USD $)
Mar. 31, 2012
Net capital under the alternative method $ 1,000,000
Aggregate debit balances 2.00%
Net capital 250,000
Stifel Nicolaus [Member]
 
Aggregate debit balances 45.20%
Net capital 307,600,000
Excess of minimum required net capital $ 294,000,000