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Investment Securities: Investment Securities (Details) - Investments - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016
Trust preferred |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 1,786 | $ 1,919
Unrealized holding gain (loss) on investment securities available for sale |  |  |
Available-for-sale Securities, Gross Unrealized Loss |  |  | (111)
Available For Sale Securities, Estimated Fair Value |  | 1,786 | 1,808
Agency securities |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 14,006 | 19,520
Unrealized holding gain (loss) on investment securities available for sale |  | 55 | 63
Available-for-sale Securities, Gross Unrealized Loss |  | (10) | (14)
Available For Sale Securities, Estimated Fair Value |  | 14,051 | 19,569
Real estate mortgage investment conduits |  |  |
Available-for-sale Securities, Amortized Cost Basis | [1] | 42,091 | 43,293
Unrealized holding gain (loss) on investment securities available for sale | [1] | 570 | 632
Available-for-sale Securities, Gross Unrealized Loss | [1] |  | (1)
Available For Sale Securities, Estimated Fair Value | [1] | 42,661 | 43,924
Mortgage-backed securities |  |  |
Available-for-sale Securities, Amortized Cost Basis | [1] | 75,662 | 75,404
Unrealized holding gain (loss) on investment securities available for sale | [1] | 1,175 | 980
Available-for-sale Securities, Gross Unrealized Loss | [1] | (15) | (31)
Available For Sale Securities, Estimated Fair Value | [1] | 76,822 | 76,353
Other mortgage-backed securities |  |  |
Available-for-sale Securities, Amortized Cost Basis | [2] | 16,755 | 8,875
Unrealized holding gain (loss) on investment securities available for sale | [2] | 219 | 185
Available-for-sale Securities, Gross Unrealized Loss | [2] | (43) | (24)
Available For Sale Securities, Estimated Fair Value | [2] | 16,931 | 9,036
Investment |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 150,300 | 149,011
Unrealized holding gain (loss) on investment securities available for sale |  | 2,019 | 1,860
Available-for-sale Securities, Gross Unrealized Loss |  | (68) | (181)
Available For Sale Securities, Estimated Fair Value |  | 152,251 | 150,690
Mortgage-backed |  |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | [3] | 69 | 75
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | [3] | 2 | 1
Held-to-maturity Securities, Fair Value | [3] | $ 71 | $ 76
[1] | Comprised of Federal Home Loan Mortgage Corporation ("FHLMC"), Federal National Mortgage Association ("FNMA") and Ginnie Mae ("GNMA") issued securities.
[2] | Comprised of U.S. Small Business Administration ("SBA") issued securities and commercial real estate ("CRE") secured securities issued by FNMA.
[3] | Comprised of FHLMC and FNMA issued securities.

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