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INVESTMENT SECURITIES: Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Available for sale: |  |  |
Amortized Cost |  | $ 202,294 | $ 202,830
Gross Unrealized Gains |  | 271 | 193
Gross Unrealized Losses |  | (1,981) | (2,809)
Estimated Fair Value |  | 200,584 | 200,214
Municipal securities |  |  |
Available for sale: |  |  |
Amortized Cost |  | 6,368 | 2,936
Gross Unrealized Gains |  | 15 |
Gross Unrealized Losses |  | (42) | (117)
Estimated Fair Value |  | 6,341 | 2,819
Agency securities |  |  |
Available for sale: |  |  |
Amortized Cost |  | 22,404 | 16,993
Gross Unrealized Gains |  | 22 | 18
Gross Unrealized Losses |  | (135) | (203)
Estimated Fair Value |  | 22,291 | 16,808
Real estate mortgage investment conduits |  |  |
Available for sale: |  |  |
Amortized Cost | [1] | 39,896 | 43,510
Gross Unrealized Gains | [1] | 42 | 49
Gross Unrealized Losses | [1] | (281) | (399)
Estimated Fair Value | [1] | 39,657 | 43,160
Residential mortgage-backed securities |  |  |
Available for sale: |  |  |
Amortized Cost | [1] | 88,782 | 97,742
Gross Unrealized Gains | [1] | 148 | 111
Gross Unrealized Losses | [1] | (770) | (1,242)
Estimated Fair Value | [1] | 88,160 | 96,611
Held to maturity: |  |  |
Amortized Cost | [2] | 46 | 64
Gross Unrealized Gains | [2] | 1 | 2
Estimated Fair Value | [2] | 47 | 66
Other mortgage-backed securities |  |  |
Available for sale: |  |  |
Amortized Cost | [3] | 44,844 | 41,649
Gross Unrealized Gains | [3] | 44 | 15
Gross Unrealized Losses | [3] | (753) | (848)
Estimated Fair Value | [3] | $ 44,135 | $ 40,816
[1] | Comprised of Federal Home Loan Mortgage Corporation ("FHLMC"), Federal National Mortgage Association ("FNMA") and Ginnie Mae ("GNMA") issued securities.
[2] | Comprised of FHLMC and FNMA issued securities.
[3] | Comprised of U.S. Small Business Administration ("SBA") issued securities and commercial real estate ("CRE") secured securities issued by FNMA.

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