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Investment Securities (Narrative) (Details) (USD $)	12 Months Ended
Investment Securities (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment Securities [Abstract]
Other-than-temporary impairment on investment securities held to maturity	$ 155,000	$ 359,000	$ 414,000
Carrying value of investment securities pledged	$ 1,100,000,000	$ 1,100,000,000

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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