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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value |  | $ 534
Less than 12 months, Unrealized Losses |  | (1)
12 months or longer, Estimated Fair Value | $ 133,307 | 139,466
12 months or longer, Unrealized Losses | (21,561) | (21,245)
Total, Estimated Fair Value | 133,307 | 140,000
Total, Unrealized Losses | (21,561) | (21,246)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 192,026 | 195,519
12 months or longer, unrealized losses | (33,791) | (33,991)
Total estimated fair value | 192,026 | 195,519
Total, unrealized losses | (33,791) | (33,991)
Municipal securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 32,394 | 32,748
12 months or longer, Unrealized Losses | (6,867) | (6,541)
Total, Estimated Fair Value | 32,394 | 32,748
Total, Unrealized Losses | (6,867) | (6,541)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 7,422 | 7,532
12 months or longer, unrealized losses | (2,892) | (2,789)
Total estimated fair value | 7,422 | 7,532
Total, unrealized losses | (2,892) | (2,789)
Agency securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 40,814 | 43,577
12 months or longer, Unrealized Losses | (4,060) | (4,241)
Total, Estimated Fair Value | 40,814 | 43,577
Total, Unrealized Losses | (4,060) | (4,241)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 49,888 | 49,601
12 months or longer, unrealized losses | (4,281) | (4,522)
Total estimated fair value | 49,888 | 49,601
Total, unrealized losses | (4,281) | (4,522)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 24,672 | 25,665
12 months or longer, Unrealized Losses | (6,005) | (5,759)
Total, Estimated Fair Value | 24,672 | 25,665
Total, Unrealized Losses | (6,005) | (5,759)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 25,694 | 26,581
12 months or longer, unrealized losses | (5,228) | (5,171)
Total estimated fair value | 25,694 | 26,581
Total, unrealized losses | (5,228) | (5,171)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
12 months or longer, Estimated Fair Value | 11,101 | 12,073
12 months or longer, Unrealized Losses | (921) | (971)
Total, Estimated Fair Value | 11,101 | 12,073
Total, Unrealized Losses | (921) | (971)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 91,829 | 94,638
12 months or longer, unrealized losses | (18,126) | (18,196)
Total estimated fair value | 91,829 | 94,638
Total, unrealized losses | (18,126) | (18,196)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value |  | 534
Less than 12 months, Unrealized Losses |  | (1)
12 months or longer, Estimated Fair Value | 24,326 | 25,403
12 months or longer, Unrealized Losses | (3,708) | (3,733)
Total, Estimated Fair Value | 24,326 | 25,937
Total, Unrealized Losses | (3,708) | (3,734)
Debt Securities, Held to maturity |  |
12 months or longer, estimated fair value | 17,193 | 17,167
12 months or longer, unrealized losses | (3,264) | (3,313)
Total estimated fair value | 17,193 | 17,167
Total, unrealized losses | $ (3,264) | $ (3,313)

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