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Investments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Trading securities portfolio
Trading securities portfolio	$ 1,118us-gaap_TradingSecuritiesRestricted		$ 1,038us-gaap_TradingSecuritiesRestricted
Gains	23us-gaap_TradingSecuritiesRealizedGain	15us-gaap_TradingSecuritiesRealizedGain
U.S. government security funds
Trading securities portfolio
Net Unrealized Losses	$ 8		$ 15

Total of all securities that are purchased with the intent to be sold in the short-term and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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