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Available-for-Sale (AFS) Securities (Reconciliation of Available-for-Sale Securities OTTI Loss) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Available-for-sale Securities [Abstract]
Noncredit portion of OTTI losses	$ (45,130)	$ (168,171)
OTTI securities in an unrealized gain/loss position since their last OTTI credit charge	37,961	57
Net noncredit portion of OTTI losses on AFS securities in AOCI	$ (7,169)	$ (168,114)

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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