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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
INVESTMENT SECURITIES |  |
Amortized Cost | $ 236,018 | $ 243,843
Gross Unrealized Losses | (42,735) | (33,629)
Estimated Fair Value | 193,283 | 210,214
Municipal securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 10,332 | 10,344
Gross Unrealized Losses | (3,516) | (2,859)
Estimated Fair Value | 6,816 | 7,485
Agency securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 54,031 | 53,941
Gross Unrealized Losses | (6,080) | (5,091)
Estimated Fair Value | 47,951 | 48,850
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 33,366 | 35,186
Gross Unrealized Losses | (6,236) | (4,769)
Estimated Fair Value | 27,130 | 30,417
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 117,761 | 123,773
Gross Unrealized Losses | (22,826) | (17,542)
Estimated Fair Value | 94,935 | 106,231
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 20,528 | 20,599
Gross Unrealized Losses | (4,077) | (3,368)
Estimated Fair Value | $ 16,451 | $ 17,231

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