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Regulatory Capital Requirements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011
Net capital under the alternative method	$ 1.0
Aggregate debit balances	2.00%
Stifel Nicolaus [Member]
Aggregate debit balances	34.60%
Net capital	206.5
Excess of minimum required net capital	$ 194.6

Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

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