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Investment securities, including securities measured at fair value (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 10, 2010
Impairment loss on investment	$ 1,299	$ 0	$ 0
Purchase Of Corporate Covertible Bonds				1,620,000
Debt Instrument, Convertible, Conversion Ratio	0.6020
Proceeds From Sale Of Bond	5,431
Marketable Securities, Gain (Loss)	645
Eturbotouch Technology Inc [Member]
Impairment loss on investment	$ 238

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- Definition

The amount of cash inflow from the sale of bond.

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Number of corporate convertible bonds purchased by the company.

+ References

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- Definition

The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

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- Definition

The amount by which the fair value of an investment 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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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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