Investments (Details Textuals 31) (Subsequent payment default [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Agricultural
Financing Receivable, Modifications [Line Items]
Number of Mortgage Loans	0	0
Carrying Value after Specific Valuation Allowance	$ 0
Commercial
Financing Receivable, Modifications [Line Items]
Number of Mortgage Loans	0	0
Residential
Financing Receivable, Modifications [Line Items]
Number of Mortgage Loans	0	0

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953682-111524

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant