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MBS And Other Investments: Narrative-Realized Gains (Losses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2013 security | Sep. 30, 2012 | Sep. 30, 2013 security | Sep. 30, 2012 security | Sep. 30, 2011 security
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gain on sale of securities |  | $ 22 | $ 0 |  | $ 79
Loss on sale of securities | 671 |  | 872 | 1,813 |
Held-to-maturity securities, realized loss, number of securities | 18 |  | 25 | 28 |
Available-for-sale securities, realized loss, number of securities | 5 |  | 5 | 1 | 2
Security owned and pledged as collateral | 4,537 | 5,699 | 4,537 | 5,699 |
Previously Recognized as a Credit Loss |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Loss on sale of securities |  |  |  | $ 1,811 |

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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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