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Securities (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Securities	Dec. 31, 2011 Securities
Securities (Textual) [Abstract]
Carrying value of securities	$ 173,757	$ 137,388
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	$ (280)	$ (337)
Number of securities	7	10
Unrealized loss position on securities, current	less than 12 months
Unrealized loss position on securities, non current	more than 12 months

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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