Unrelease ESOP Shares Excluded from Weighted Average Common Shares Outstanding (Details)	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Post 1992 shares of the employee stock ownership plan that have not been committed to be released	66,669	110,504	153,069

Number of employee stock ownership plan (ESOP) shares that have not been committed to be released determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6418601&loc=d3e17400-113927

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-6

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration