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Fair Value of Financial Instruments (Details Textual) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Level 3 [Member]
Fair Value of Financial Instruments (Textual) [Abstract]
Percentage of investment portfolio fair value	88.00%	91.00%
Net realized gains or losses	$ 0	$ 0
Percentage of invested assets in whole investment portfolio	2.00%

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- Definition

Percentage of invested assets in whole investment portfolio.

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No definition available.

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- Definition

Percentage of investment portfolio fair value level 3.

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No definition available.

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- Definition

Realized gain loss on assets included in earning due to change in unrealized gain or losses attributable to Level 3 assets still held.

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No definition available.

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