Uniform Net Capital Rule Requirements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012 subsidiaries
Uniform Net Capital Rule Requirements
Number of subsidiaries registered as broker dealers	2
Maximum ratio of aggregate indebtedness to net capital	15.0
Minimum net capital	$ 250
Net capital percentage of debit balances	2.00%

This element represents the amount of net capital of a broker or dealer that has elected not to be subject to the Aggregate Indebtedness Standard (as defined). The amount of net capital represented by this element is the greater of $250,000 or two percent of aggregate debit items computed in accordance with the Formula for Determination of Reserve Requirements for Brokers and Dealers (as defined).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Rule 15c3

-Number 240

-Section 1

-Paragraph 1

-Subparagraph ii

-Article 15c3

-Subsection a

Name:	us-gaap_TwoPercentOfDebitItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant