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Schedule of Activity in ESOP Plan (Detail)	12 Months Ended
Schedule of Activity in ESOP Plan (Detail)	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares at beginning of year	1,334,140
Additional shares purchased
Shares distributed for terminations	(1,328,430)
Sale of shares for cash distributions	(5,710)
Balance at end of year
Allocated shares included above
Unallocated shares

The shares that, although not legally released, will be released by a future scheduled and committed debt service payment and will be allocated to employees for service rendered in the current accounting period. The ESOP documents typically define the period of service to which the shares relate. ESOP shares are released to compensate employees directly, to settle employer liabilities for other employee benefits, and to replace dividends on allocated shares that are used for debt service.

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