Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2012	Dec. 31, 2011
Schedule of other-than-temporary impairment losses investment securities
Life- to - Date Gross other-than-temporary impairments	$ 2,547	$ 2,435
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income (Loss)	1,152	1,100
Life- to - Date Net other-than-temporary impairments included in earnings	1,395	1,335
Subsequent Impairments [Member]
Schedule of other-than-temporary impairment losses investment securities
Life- to - Date Gross other-than-temporary impairments	112
Life-to-Date Other-Than-Temporary Impairments Included in Other Comprehensive Income (Loss)	52
Life- to - Date Net other-than-temporary impairments included in earnings	$ 60

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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+ Details

- Definition

The amount of other than temporary impairment losses on investments in debt securities categorized as Held-to-maturity which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) of investments in debt securities due to credit losses and other than temporary impairments due to other than credit losses when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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