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Earnings Per Share (Narratives) (Details) - shares | 6 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
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 | 18,885 | 21,219

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- Definition 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. + References 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=65882273&loc=d3e17400-113927 + Details
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- References No definition available. + Details
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