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Shares Held by the ESOP Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]    
Allocated shares 1,374 1,372
Unreleased shares 76 124
Fair value of unreleased shares $ 13,218 $ 12,841