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Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Components of other comprehensive income (loss) pretax and after-tax
Net unrealized losses on available-for-sale investments arising during the periods, Pretax
Net unrealized losses on available-for-sale investments arising during the periods, Tax
Net unrealized losses on available-for-sale investments arising during the periods, After-tax
Other comprehensive income (loss), Pretax
Other comprehensive income (loss), Tax
Other comprehensive income (loss), After-tax

X

- Definition

Before tax amount of other comprehensive income (loss) attributable to the parent entity.

+ References

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Net of tax amount of other comprehensive income (loss) attributable to the parent entity.

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Before tax and reclassification adjustments amount of unrealized holding gain (loss) and transfers on available-for-sale securities.

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