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Other-than-Temporary Impairment Not Previously Recognized (Table Text Block)
6 Months Ended
Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]  
Other than temporary impairment, credit losses recognized in earnings
Credit losses recognized in earnings for which a portion of an other-than-temporary impairment was recognized in other comprehensive income were as follows:
 
   
Credit Loss
 
   
(Unaudited)
 
   
(In thousands)
 
Balance at March 31, 2012
 $552 
Additions:
    
Other-than-temporary impairment not previously recognized
  - 
Balance at September 30, 2012
 $552