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Other-than-temporary Impairment Not Previously Recognized (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013
Other than temporary impairment credit losses recognized in earnings [Roll Forward]
Balance at March 31, 2012	$ 552
Other-than-temporary impairment not previously recognized	0
Balance at March 31, 2013	$ 552

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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