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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | $ 39,574 |  | $ 28 |
Gross Unrealized Losses |  | (1,354) |  |  |
Estimated Fair Value |  | 38,220 |  | 28 |
Municipal securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 10,391 |  |  |
Gross Unrealized Losses |  | (509) |  |  |
Estimated Fair Value |  | 9,882 |  |  |
Agency securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 7,688 |  |  |
Gross Unrealized Losses |  | (220) |  |  |
Estimated Fair Value |  | 7,468 |  |  |
Real estate mortgage investment conduits |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | [1] | 9,207 |  |  |
Gross Unrealized Losses | [1] | (141) |  |  |
Estimated Fair Value | [1] | 9,066 |  |  |
Residential mortgage-backed securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost |  | 6,175 | [2] | 28 | [3]
Gross Unrealized Losses | [2] | (119) |  |  |
Estimated Fair Value |  | 6,056 | [2] | $ 28 | [3]
Other mortgage-backed securities |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |
Amortized Cost | [4] | 6,113 |  |  |
Gross Unrealized Losses | [4] | (365) |  |  |
Estimated Fair Value | [4] | $ 5,748 |  |  |
[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 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.

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