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Investment Securities (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cumulative roll forward of credit losses recognized in earnings for debt securities for which a portion of the OTTI is recognized in OCI:
Beginning balance	$ 6,536	$ 4,778	$ 6,536	$ 4,251
Additions for credit losses on securities not previously recognized
Additions for credit losses on securities previously recognized	942	210	942	737
Reduction for increases in cash flows
Reduction for securities management no longer intends to hold to recovery
Reduction for securities sold/realized losses
Ending balance	$ 7,478	$ 4,988	$ 7,478	$ 4,988

X

- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

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