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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
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Credit losses on debt securities held:    
Beginning balance $ 11,355 $ 11,355
Additions related to other-than-temporary losses not previously recognized      
Ending balance $ 11,355 $ 11,355