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Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Rollforward of the credit losses recognized in earnings    
Beginning balance $ 14,983 $ 15,180
Increases to the amount related to the credit loss for which other-than-temporary was previously recognized 0 0
Ending balance $ 14,983 $ 15,180