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MBS And Other Investments: Schedule of Other than Temporary Impairments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Held to maturity          
Net OTTI recognized in earnings $ 52us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities        
Held-to-maturity Securities          
Held to maturity          
Total OTTI   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
89us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
86us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
Portion of OTTI recognized in other comprehensive (income) loss (before income taxes)   (1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
1us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
(1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
Net OTTI recognized in earnings   1us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
[1] 89us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
[1] 1us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
[1] 87us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
[1]
Available-for-sale Securities          
Available for sale          
Total OTTI   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Portion of OTTI recognized in other comprehensive (income) loss (before income taxes)   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
Net OTTI recognized in earnings   $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
[1] $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
[1] $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
[1] $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
[1]
[1] Represents net recoveries (OTTI) related to credit losses.