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INVESTMENT SECURITIES: Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Available for sale: |  |  |  |  |
Amortized Cost |  | $ 219,427 |  | $ 202,830 |
Gross Unrealized Gains |  | 5 |  | 193 |
Gross Unrealized Losses |  | (6,211) |  | (2,809) |
Estimated Fair Value |  | 213,221 |  | 200,214 |
Municipal securities |  |  |  |  |
Available for sale: |  |  |  |  |
Amortized Cost |  | 9,041 |  | 2,936 |
Gross Unrealized Gains |  | 0 |  | 0 |
Gross Unrealized Losses |  | (309) |  | (117) |
Estimated Fair Value |  | 8,732 |  | 2,819 |
Agency securities |  |  |  |  |
Available for sale: |  |  |  |  |
Amortized Cost |  | 22,412 |  | 16,993 |
Gross Unrealized Gains |  | 1 |  | 18 |
Gross Unrealized Losses |  | (311) |  | (203) |
Estimated Fair Value |  | 22,102 |  | 16,808 |
Real estate mortgage investment conduits |  |  |  |  |
Available for sale: |  |  |  |  |
Amortized Cost |  | 48,310 | [1] | 43,510 | [2]
Gross Unrealized Gains |  | 0 | [1] | 49 | [2]
Gross Unrealized Losses |  | (1,355) | [1] | (399) | [2]
Estimated Fair Value |  | 46,955 | [1] | 43,160 | [2]
Residential mortgage-backed securities |  |  |  |  |
Available for sale: |  |  |  |  |
Amortized Cost |  | 91,786 | [1] | 97,742 | [2]
Gross Unrealized Gains |  | 3 | [1] | 111 | [2]
Gross Unrealized Losses |  | (2,715) | [1] | (1,242) | [2]
Estimated Fair Value |  | 89,074 | [1] | 96,611 | [2]
Held to maturity: |  |  |  |  |
Amortized Cost | [3] | 42 |  | 64 |
Gross Unrealized Gains | [3] | 1 |  | 2 |
Gross Unrealized Losses | [3] | 0 |  | 0 |
Estimated Fair Value | [3] | 43 |  | 66 |
Other mortgage-backed securities |  |  |  |  |
Available for sale: |  |  |  |  |
Amortized Cost |  | 47,878 | [4] | 41,649 | [5]
Gross Unrealized Gains |  | 1 | [4] | 15 | [5]
Gross Unrealized Losses |  | (1,521) | [4] | (848) | [5]
Estimated Fair Value |  | $ 46,358 | [4] | $ 40,816 | [5]
[1] | Comprised of FHLMC, Federal National Mortgage Association ("FNMA") and Ginnie Mae ("GNMA") issued securities.
[2] | Comprised of FHLMC, FNMA and GNMA issued securities.
[3] | Comprised of FHLMC and FNMA issued securities.
[4] | Comprised of U.S. Small Business Administration ("SBA") issued securities and commercial real estate ("CRE") secured securities issued by FNMA.
[5] | Comprised of SBA issued securities and CRE secured securities issued by FNMA.

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