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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Mar. 31, 2023
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 7,113 | $ 69,746
Less than 12 months, Unrealized Losses | (20) | (1,500)
12 months or longer, Estimated Fair Value | 186,188 | 134,268
12 months or longer, Unrealized Losses | (23,004) | (22,635)
Total, Estimated Fair Value | 193,301 | 204,014
Total, Unrealized Losses | (23,024) | (24,135)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 200,475 |
12 months or longer, unrealized losses | (32,184) |
Total estimated fair value | 200,475 |
Total, unrealized losses | (32,184) |
Less than 12 months, Estimated fair value |  | 10,995
Less than 12 months, unrealized losses |  | (431)
12 months or longer, Estimated Fair Value |  | 199,219
12 months or longer, Unrealized Losses |  | (33,198)
Total Estimated fair value |  | 210,214
Total, Unrealized Losses |  | (33,629)
Municipal securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 448 | 6,277
Less than 12 months, Unrealized Losses | (1) | (133)
12 months or longer, Estimated Fair Value | 37,463 | 32,797
12 months or longer, Unrealized Losses | (7,460) | (7,479)
Total, Estimated Fair Value | 37,911 | 39,074
Total, Unrealized Losses | (7,461) | (7,612)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 7,530 |
12 months or longer, unrealized losses | (2,796) |
Total estimated fair value | 7,530 |
Total, unrealized losses | (2,796) |
12 months or longer, Estimated Fair Value |  | 7,485
12 months or longer, Unrealized Losses |  | (2,859)
Total Estimated fair value |  | 7,485
Total, Unrealized Losses |  | (2,859)
Agency securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 5,819 | 43,451
Less than 12 months, Unrealized Losses | (17) | (747)
12 months or longer, Estimated Fair Value | 78,173 | 36,646
12 months or longer, Unrealized Losses | (5,197) | (5,227)
Total, Estimated Fair Value | 83,992 | 80,097
Total, Unrealized Losses | (5,214) | (5,974)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 49,784 |
12 months or longer, unrealized losses | (4,293) |
Total estimated fair value | 49,784 |
Total, unrealized losses | (4,293) |
Less than 12 months, Estimated fair value |  | 8,413
Less than 12 months, unrealized losses |  | (240)
12 months or longer, Estimated Fair Value |  | 40,437
12 months or longer, Unrealized Losses |  | (4,851)
Total Estimated fair value |  | 48,850
Total, Unrealized Losses |  | (5,091)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value |  | 2,693
Less than 12 months, Unrealized Losses |  | (97)
12 months or longer, Estimated Fair Value | 26,420 | 26,184
12 months or longer, Unrealized Losses | (5,601) | (5,273)
Total, Estimated Fair Value | 26,420 | 28,877
Total, Unrealized Losses | (5,601) | (5,370)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 27,507 |
12 months or longer, unrealized losses | (5,031) |
Total estimated fair value | 27,507 |
Total, unrealized losses | (5,031) |
Less than 12 months, Estimated fair value |  | 2,580
Less than 12 months, unrealized losses |  | (191)
12 months or longer, Estimated Fair Value |  | 27,837
12 months or longer, Unrealized Losses |  | (4,578)
Total Estimated fair value |  | 30,417
Total, Unrealized Losses |  | (4,769)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value |  | 3,449
Less than 12 months, Unrealized Losses |  | (147)
12 months or longer, Estimated Fair Value | 12,872 | 12,022
12 months or longer, Unrealized Losses | (898) | (894)
Total, Estimated Fair Value | 12,872 | 15,471
Total, Unrealized Losses | (898) | (1,041)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 98,382 |
12 months or longer, unrealized losses | (16,831) |
Total estimated fair value | 98,382 |
Total, unrealized losses | (16,831) |
Less than 12 months, Estimated fair value |  | 2
12 months or longer, Estimated Fair Value |  | 106,229
12 months or longer, Unrealized Losses |  | (17,542)
Total Estimated fair value |  | 106,231
Total, Unrealized Losses |  | (17,542)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 846 | 13,876
Less than 12 months, Unrealized Losses | (2) | (376)
12 months or longer, Estimated Fair Value | 31,260 | 26,619
12 months or longer, Unrealized Losses | (3,848) | (3,762)
Total, Estimated Fair Value | 32,106 | 40,495
Total, Unrealized Losses | (3,850) | (4,138)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 17,272 |
12 months or longer, unrealized losses | (3,233) |
Total estimated fair value | 17,272 |
Total, unrealized losses | $ (3,233) |
12 months or longer, Estimated Fair Value |  | 17,231
12 months or longer, Unrealized Losses |  | (3,368)
Total Estimated fair value |  | 17,231
Total, Unrealized Losses |  | $ (3,368)

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