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4. Mortgage-backed Securities: Mortgage-Backed Securities Held to Maturity (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
--- | --- | ---
Mortgage-Backed Securities Held to Maturity Amortized Cost | $ 125 |
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |
Mortgage-Backed Securities Held to Maturity Amortized Cost | 31 | 69
Mortgage-Backed Securities Held to Maturity Gross Unrealized Gains | 3 | 4
Mortgage Backed Securities Held to Maturity Estimated Fair Value | 34 | 73
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |
Mortgage-Backed Securities Held to Maturity Amortized Cost | 94 | 102
Mortgage-Backed Securities Held to Maturity Gross Unrealized Gains | 1 | 2
Mortgage Backed Securities Held to Maturity Estimated Fair Value | 95 | 104
Mortgage-Backed Securities Held to Maturity |  |
Mortgage-Backed Securities Held to Maturity Amortized Cost | 125 | 171
Mortgage-Backed Securities Held to Maturity Gross Unrealized Gains | 4 | 6
Mortgage Backed Securities Held to Maturity Estimated Fair Value | $ 129 | $ 177

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