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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 107,119 | $ 105,317
Less than 12 months, Unrealized Losses | (2,344) | (2,460)
12 months or longer, Estimated Fair Value | 15,581 | 2,225
12 months or longer, Unrealized Losses | (524) | (51)
Total, Estimated Fair Value | 122,700 | 107,542
Total, Unrealized Losses | (2,868) | (2,511)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 167,559 | 38,199
Less than 12 months, unrealized losses | (2,725) | (1,354)
12 months or longer, Estimated Fair Value | 11,359 |
12 months or longer, Unrealized Losses | (309) |
Total Estimated fair value | 178,918 | 38,199
Total, Unrealized Losses | (3,034) | (1,354)
Municipal securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 29,956 | 17,529
Less than 12 months, Unrealized Losses | (617) | (555)
Total, Estimated Fair Value | 29,956 | 17,529
Total, Unrealized Losses | (617) | (555)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 7,537 | 9,882
Less than 12 months, unrealized losses | (407) | (509)
Total Estimated fair value | 7,537 | 9,882
Total, Unrealized Losses | (407) | (509)
Agency securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 35,205 | 23,306
Less than 12 months, Unrealized Losses | (637) | (686)
12 months or longer, Estimated Fair Value | 5,774 |
12 months or longer, Unrealized Losses | (223) |
Total, Estimated Fair Value | 40,979 | 23,306
Total, Unrealized Losses | (860) | (686)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 25,304 | 7,468
Less than 12 months, unrealized losses | (215) | (220)
12 months or longer, Estimated Fair Value | 5,950 |
12 months or longer, Unrealized Losses | (201) |
Total Estimated fair value | 31,254 | 7,468
Total, Unrealized Losses | (416) | (220)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 22,585 | 25,462
Less than 12 months, Unrealized Losses | (621) | (480)
12 months or longer, Estimated Fair Value | 8,552 |
12 months or longer, Unrealized Losses | (286) |
Total, Estimated Fair Value | 31,137 | 25,462
Total, Unrealized Losses | (907) | (480)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 20,592 | 9,066
Less than 12 months, unrealized losses | (548) | (141)
12 months or longer, Estimated Fair Value | 2,773 |
12 months or longer, Unrealized Losses | (82) |
Total Estimated fair value | 23,365 | 9,066
Total, Unrealized Losses | (630) | (141)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 2,768 | 33,164
Less than 12 months, Unrealized Losses | (31) | (614)
Total, Estimated Fair Value | 2,768 | 33,164
Total, Unrealized Losses | (31) | (614)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 100,070 | 6,035
Less than 12 months, unrealized losses | (1,121) | (119)
12 months or longer, Estimated Fair Value | 2,636 |
12 months or longer, Unrealized Losses | (26) |
Total Estimated fair value | 102,706 | 6,035
Total, Unrealized Losses | (1,147) | (119)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 16,605 | 5,856
Less than 12 months, Unrealized Losses | (438) | (125)
12 months or longer, Estimated Fair Value | 1,255 | 2,225
12 months or longer, Unrealized Losses | (15) | (51)
Total, Estimated Fair Value | 17,860 | 8,081
Total, Unrealized Losses | (453) | (176)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 14,056 | 5,748
Less than 12 months, unrealized losses | (434) | (365)
Total Estimated fair value | 14,056 | 5,748
Total, Unrealized Losses | $ (434) | $ (365)

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