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Mortgage-backed Securities: Mortgage-backed Securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Details
Proceeds from sale of mortgage-backed securities available for sale	$ 14,225us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	$ 0us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale	$ 0us-gaap_ProceedsFromSaleOfMortgageBackedSecuritiesMBSCategorizedAsAvailableForSale
Gain (Loss) on Sales of Mortgage Backed Securities (MBS)	127us-gaap_GainLossOnSalesOfMortgageBackedSecuritiesMBS	0us-gaap_GainLossOnSalesOfMortgageBackedSecuritiesMBS	0us-gaap_GainLossOnSalesOfMortgageBackedSecuritiesMBS
Available-for-sale mortgage-backed securities pledged as collateral, Amortized Cost	1,300fil_AvailableForSaleMortgageBackedSecuritiesPledgedAsCollateralAmortizedCost	1,700fil_AvailableForSaleMortgageBackedSecuritiesPledgedAsCollateralAmortizedCost
Available-for-sale mortgage-backed securities pledged as collateral, Fair Value	$ 1,300fil_AvailableForSaleMortgageBackedSecuritiesPledgedAsCollateralFairValue	$ 1,700fil_AvailableForSaleMortgageBackedSecuritiesPledgedAsCollateralFairValue

X

- Definition

Amortized cost of mortgage-backed securities available for sale, that have been pledged as collateral for government public funds held by the Bank.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of mortgage-backed securities available for sale, that have been pledged as collateral for government public funds held by the Bank.

+ References

No definition available.

+ Details

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X

- Definition

Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(h))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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X

- Definition

The cash inflow from the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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