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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 493 | $ 418
Less than 12 months, Unrealized Losses | (4) | (3)
12 months or longer, Estimated Fair Value | 116,183 | 116,898
12 months or longer, Unrealized Losses | (16,107) | (17,519)
Total, Estimated Fair Value | 116,676 | 117,316
Total, Unrealized Losses | (16,111) | (17,522)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 171,776 | 175,392
12 months or longer, Unrealized Losses | (25,702) | (27,687)
Total, Estimated Fair Value | 171,776 | 175,392
Total, Unrealized Losses | (25,702) | (27,687)
Municipal securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 29,918 | 29,849
12 months or longer, Unrealized Losses | (5,878) | (6,262)
Total, Estimated Fair Value | 29,918 | 29,849
Total, Unrealized Losses | (5,878) | (6,262)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 7,583 | 7,629
12 months or longer, Unrealized Losses | (2,707) | (2,667)
Total, Estimated Fair Value | 7,583 | 7,629
Total, Unrealized Losses | (2,707) | (2,667)
Agency securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 30,577 | 30,203
12 months or longer, Unrealized Losses | (2,371) | (2,741)
Total, Estimated Fair Value | 30,577 | 30,203
Total, Unrealized Losses | (2,371) | (2,741)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 39,949 | 39,556
12 months or longer, Unrealized Losses | (2,354) | (2,723)
Total, Estimated Fair Value | 39,949 | 39,556
Total, Unrealized Losses | (2,354) | (2,723)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 23,134 | 23,490
12 months or longer, Unrealized Losses | (4,843) | (5,107)
Total, Estimated Fair Value | 23,134 | 23,490
Total, Unrealized Losses | (4,843) | (5,107)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 23,754 | 24,268
12 months or longer, Unrealized Losses | (3,871) | (4,231)
Total, Estimated Fair Value | 23,754 | 24,268
Total, Unrealized Losses | (3,871) | (4,231)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 9,047 | 9,540
12 months or longer, Unrealized Losses | (488) | (589)
Total, Estimated Fair Value | 9,047 | 9,540
Total, Unrealized Losses | (488) | (589)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 84,529 | 86,485
12 months or longer, Unrealized Losses | (14,398) | (15,448)
Total, Estimated Fair Value | 84,529 | 86,485
Total, Unrealized Losses | (14,398) | (15,448)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 493 | 418
Less than 12 months, Unrealized Losses | (4) | (3)
12 months or longer, Estimated Fair Value | 23,507 | 23,816
12 months or longer, Unrealized Losses | (2,527) | (2,820)
Total, Estimated Fair Value | 24,000 | 24,234
Total, Unrealized Losses | (2,531) | (2,823)
Debt Securities, Held to maturity |  |
12 months or longer, Estimated Fair Value | 15,961 | 17,454
12 months or longer, Unrealized Losses | (2,372) | (2,618)
Total, Estimated Fair Value | 15,961 | 17,454
Total, Unrealized Losses | $ (2,372) | $ (2,618)

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