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Mortgage-backed Securities: Schedule of mortgage-backed securities held to maturity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Mar. 31, 2013
FHLMC mortgage-backed securities
    
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment $ 27 [1] $ 31
Held-to-maturity Securities, Unrecognized Holding Gain 2 [1] 3
Held-to-maturity Securities, Fair Value 29 [1] 34
FNMA mortgage-backed securities
    
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 77 [2] 94
Held-to-maturity Securities, Unrecognized Holding Gain 1 [2] 1
Held-to-maturity Securities, Fair Value 78 [2] 95
Mortgage-backed
    
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment 104 125
Held-to-maturity Securities, Unrecognized Holding Gain 3 4
Held-to-maturity Securities, Fair Value $ 107 $ 129
[1] Federal Home Loan Mortgage Corporation (FHLMC)
[2] Federal National Mortgage Association (FNMA)