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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