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Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Rollforward of the credit losses recognized in earnings        
Beginning balance $ 15,180 $ 15,070 $ 15,180 $ 15,070
Amounts related to credit loss for which an other-than-temporary impairment was not previously recognized   97   97
Increases to the amount related to the credit loss for which other-than-temporary impairment was previously recognized 11   11  
Amounts realized for securities sold during the period (208)   (208)  
Ending balance $ 14,983 $ 15,167 $ 14,983 $ 15,167