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14. Employee Stock Ownership Plan: Employee Stock Ownership Plan (ESOP) Disclosures (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value $ 325,000 $ 334,000 $ 524,000 $ 453,000
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares 123,165 147,798 172,431 197,064
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 839,419 814,786 790,153 765,520
Employee Stock Ownership Plan (ESOP), Shares in ESOP 962,584 962,584 962,584 962,584
Allocation December 31, 2010
       
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares (24,633)      
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 24,633      
Allocation December 31, 2011
       
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares (24,633)      
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 24,633      
Allocation December 31, 2012
       
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares (24,633)      
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 24,633