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Investment Securities (Debt Securities Credit Loss Recognized in Income, and Other Losses Recorded in Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Credit losses on debt securities held:    
Balance, January 1 $ 11,355 $ 11,355
Additions related to other-than-temporary losses not previously recognized      
Balance, March 31 $ 11,355 $ 11,355