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4. Mortgage-backed Securities: Mortgage-Backed Securities Available for Sale (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012
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Mortgage-Backed Securities Available for Sale Amortized Cost | $ 416 |
Mortgage-Backed Securities Available for Sale Fair Value | 431 |
Real Estate Mortgage Investment Conduits |  |
Mortgage-Backed Securities Available for Sale Amortized Cost | 230 | 319
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains | 7 | 10
Mortgage-Backed Securities Available for Sale Fair Value | 237 | 329
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |
Mortgage-Backed Securities Available for Sale Amortized Cost | 183 | 613
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains | 8 | 23
Mortgage-Backed Securities Available for Sale Fair Value | 191 | 636
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |
Mortgage-Backed Securities Available for Sale Amortized Cost | 3 | 8
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains |  | 1
Mortgage-Backed Securities Available for Sale Fair Value | 3 | 9
Mortgage-Backed Securities Available for Sale |  |
Mortgage-Backed Securities Available for Sale Amortized Cost | 416 | 940
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains | 15 | 34
Mortgage-Backed Securities Available for Sale Fair Value | $ 431 | $ 974

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