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Regulatory Capital Requirements (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Net capital under the alternative method $ 1.0
Aggregate debit balances 2.00%
Stifel Nicolaus [Member]
 
Aggregate debit balances 53.10%
Net capital 342.4
Excess of minimum required net capital $ 329.5