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Mortgage-backed Securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Mar. 31, 2012
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Mortgage-backed securities held to maturity pledged as collateral, Amortized Cost | $ 65,000 | $ 69,000
Mortgage-backed securities held to maturity pledged as collateral, Fair Value | 68,000 | 71,000
Available-for-sale mortgage-backed securities pledged as collateral, Amortized Cost | 544,000 | 744,000
Available-for-sale mortgage-backed securities pledged as collateral, Fair Value | $ 569,000 | $ 776,000

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- 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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Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
Name: | fil_AvailableForSaleMortgageBackedSecuritiesPledgedAsCollateralFairValue
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of mortgage-backed securities held to maturity and pledged as collateral for governmental public funds held by the bank. + References No definition available. + Details
Name: | fil_MortgageBackedSecuritiesHeldToMaturityAmortizedCost
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of mortgage-backed securities held to maturity and pledged as collateral for governmental public funds held by the bank. + References No definition available. + Details
Name: | fil_MortgageBackedSecuritiesHeldToMaturityPledgedAsCollateralFairValue
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant