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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | ---
INVESTMENT SECURITIES |  |
Amortized Cost | $ 232,659 | $ 243,843
Gross Unrealized Losses | (32,184) | (33,629)
Estimated Fair Value | 200,475 | 210,214
Municipal securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 10,326 | 10,344
Gross Unrealized Losses | (2,796) | (2,859)
Estimated Fair Value | 7,530 | 7,485
Agency securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 54,077 | 53,941
Gross Unrealized Losses | (4,293) | (5,091)
Estimated Fair Value | 49,784 | 48,850
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 32,538 | 35,186
Gross Unrealized Losses | (5,031) | (4,769)
Estimated Fair Value | 27,507 | 30,417
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 115,213 | 123,773
Gross Unrealized Losses | (16,831) | (17,542)
Estimated Fair Value | 98,382 | 106,231
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 20,505 | 20,599
Gross Unrealized Losses | (3,233) | (3,368)
Estimated Fair Value | $ 17,272 | $ 17,231

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