Fair Value Disclosure (Narratives) (Details)	6 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]
Fair Value, Held-to-maturity Securities, Valuation Techniques	0

This element represents the inputs and valuation techniques used to measure fair value and a discussion of changes, if any, in the valuation techniques and related inputs used to measure similar assets in prior periods.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

Name:	us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisValuationTechniquesHeldToMaturitySecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration