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Mortgage-backed Securities: Schedule of mortgage-backed securities held to maturity (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Mar. 31, 2012
--- | --- | ---
Investment securities held to maturity, at amortized cost |  |  | $ 493
Fair Value of Investment securities held to maturity |  |  | 542
FHLMC mortgage-backed securities |  |  |
Investment securities held to maturity, at amortized cost | 66 | [1] | 69
Held-to-maturity Securities, Unrecognized Holding Gain | 4 | [1] | 4
Fair Value of Investment securities held to maturity | 70 | [1] | 73
FNMA mortgage-backed securities |  |  |
Investment securities held to maturity, at amortized cost | 98 | [2] | 102
Held-to-maturity Securities, Unrecognized Holding Gain | 2 | [2] | 2
Fair Value of Investment securities held to maturity | 100 | [2] | 104
Mortgage-backed |  |  |
Investment securities held to maturity, at amortized cost | 164 |  | 171
Held-to-maturity Securities, Unrecognized Holding Gain | 6 |  | 6
Fair Value of Investment securities held to maturity | $ 170 |  | $ 177
[1] | Federal Home Loan Mortgage Corporation (FHLMC)
[2] | Federal National Mortgage Association (FNMA)

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- Definition Amount of investments in debt securities categorized as held-to-maturity valued at amortized cost, excludes other than temporary impairment (OTTI). + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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- Definition As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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