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Fair Value (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Level 3 [Member]	Dec. 31, 2011 Level 3 [Member]
Fair Value (Textual) [Abstract]
Securities of less transparency			0	0
Transfers between valuation levels for any assets	$ 0	$ 0

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Securities of less transparency.

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Transfers between valuation levels for any assets.

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No definition available.

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