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Securities (Gains (Losses) on the sales of debt securities and credit losses for OTTI of investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Gain (Loss) on Investments [Line Items]
Gross Realized Gains			$ 2,800
OTTI Credit Losses	(649)	(324)	(962)
Net Gains (Losses)	629	343	2,762
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	2,889	983	6,690
Gross Realized (Losses)	(1,838)	(633)	(3,889)
OTTI Credit Losses	(649)	(324)	(962)
Net Gains (Losses)	$ 402	$ 26	$ 1,839

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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