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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | ---
INVESTMENT SECURITIES |  |
Amortized Cost | $ 212,722 | $ 39,574
Gross Unrealized Gains | 339 |
Gross Unrealized Losses | (3,034) | (1,354)
Estimated Fair Value | 210,027 | 38,220
Municipal securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 10,373 | 10,391
Gross Unrealized Gains | 7 |
Gross Unrealized Losses | (407) | (509)
Estimated Fair Value | 9,973 | 9,882
Agency securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 34,671 | 7,688
Gross Unrealized Gains | 3 |
Gross Unrealized Losses | (416) | (220)
Estimated Fair Value | 34,258 | 7,468
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 28,614 | 9,207
Gross Unrealized Gains | 61 |
Gross Unrealized Losses | (630) | (141)
Estimated Fair Value | 28,045 | 9,066
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 121,649 | 6,175
Gross Unrealized Gains | 267 |
Gross Unrealized Losses | (1,147) | (119)
Estimated Fair Value | 120,769 | 6,056
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 17,415 | 6,113
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (434) | (365)
Estimated Fair Value | $ 16,982 | $ 5,748

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