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INVESTMENT SECURITIES - Available for sale (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | $ 122,671 | $ 145,529
Gross Unrealized Gains |  | 3,692 | 2,953
Gross Unrealized Losses |  | (90) | (191)
Estimated Fair Value |  | 126,273 | 148,291
Municipal securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 4,733 | 4,740
Gross Unrealized Gains |  | 277 | 137
Gross Unrealized Losses |  | 0 |
Estimated Fair Value |  | 5,010 | 4,877
Agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 3,006 | 6,009
Gross Unrealized Gains |  | 4 | 17
Gross Unrealized Losses |  | (8) | (10)
Estimated Fair Value |  | 3,002 | 6,016
Real estate mortgage investment conduits |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 36,312 | 42,663
Gross Unrealized Gains | [1] | 811 | 1,128
Gross Unrealized Losses | [1] |  | 0
Estimated Fair Value | [1] | 37,123 | 43,791
Residential mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [1] | 48,302 | 58,700
Gross Unrealized Gains | [1] | 1,399 | 1,415
Gross Unrealized Losses | [1] |  | (30)
Estimated Fair Value | [1] | 49,701 | 60,085
Other mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | [2] | 30,318 | 33,417
Gross Unrealized Gains | [2] | 1,201 | 256
Gross Unrealized Losses | [2] | (82) | (151)
Estimated Fair Value | [2] | $ 31,437 | $ 33,522
[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.

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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