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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | ---
INVESTMENT SECURITIES |  |
Amortized Cost | $ 72,109 | $ 39,574
Gross Unrealized Gains | 9 |
Gross Unrealized Losses | (1,411) | (1,354)
Estimated Fair Value | 70,707 | 38,220
Municipal securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 10,379 | 10,391
Gross Unrealized Gains | 9 |
Gross Unrealized Losses | (340) | (509)
Estimated Fair Value | 10,048 | 9,882
Agency securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 10,658 | 7,688
Gross Unrealized Losses | (213) | (220)
Estimated Fair Value | 10,445 | 7,468
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 18,017 | 9,207
Gross Unrealized Losses | (264) | (141)
Estimated Fair Value | 17,753 | 9,066
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 20,806 | 6,175
Gross Unrealized Losses | (242) | (119)
Estimated Fair Value | 20,564 | 6,056
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 12,249 | 6,113
Gross Unrealized Losses | (352) | (365)
Estimated Fair Value | $ 11,897 | $ 5,748

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