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Regulatory Capital Requirements (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2013 Stifel Nicolaus [Member]
Net capital under the alternative method	$ 1.0
Aggregate debit balances	2.00%	52.90%
Net capital		320.5
Excess of minimum required net capital		$ 308.3

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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