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Investments (Narrative) (Details) (USD $)	12 Months Ended
Investments (Narrative) (Details) (USD $)	Dec. 31, 2011	Jun. 30, 2012
Gain (Loss) on Investments [Line Items]
Held-to-maturity securities, unrealized losses	$ 0	$ 0
Single largest loss position	501,000	498,000
Second largest loss position	70,000	75,000
Third largest loss position	58,000	25,000
Other-than-temporary impairments, available-for-sale securities	$ 398,000
Maximum [Member]
Gain (Loss) on Investments [Line Items]
Percent of investment portfolio below investment grade		4.00%

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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