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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 39,225 | $ 39,574
Gross Unrealized Gains | 36 |
Gross Unrealized Losses | (597) | (1,354)
Estimated Fair Value | 38,664 | 38,220
Municipal securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 10,384 | 10,391
Gross Unrealized Gains | 36 |
Gross Unrealized Losses | (177) | (509)
Estimated Fair Value | 10,243 | 9,882
Agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 7,676 | 7,688
Gross Unrealized Losses | (105) | (220)
Estimated Fair Value | 7,571 | 7,468
Real estate mortgage investment conduits |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 9,068 | 9,207
Gross Unrealized Losses | (77) | (141)
Estimated Fair Value | 8,991 | 9,066
Residential mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 5,989 | 6,175
Gross Unrealized Losses | (75) | (119)
Estimated Fair Value | 5,914 | 6,056
Other mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 6,108 | 6,113
Gross Unrealized Losses | (163) | (365)
Estimated Fair Value | $ 5,945 | $ 5,748

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