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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 176,967 | $ 105,317
Less than 12 months, Unrealized Losses | (2,562) | (2,460)
12 months or longer, Estimated Fair Value | 1,331 | 2,225
12 months or longer, Unrealized Losses | (18) | (51)
Total, Estimated Fair Value | 178,298 | 107,542
Total, Unrealized Losses | (2,580) | (2,511)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 66,985 | 38,199
Less than 12 months, unrealized losses | (1,411) | (1,354)
Total Estimated fair value | 66,985 | 38,199
Total, Unrealized Losses | (1,411) | (1,354)
Municipal securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 37,869 | 17,529
Less than 12 months, Unrealized Losses | (606) | (555)
Total, Estimated Fair Value | 37,869 | 17,529
Total, Unrealized Losses | (606) | (555)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 6,343 | 9,882
Less than 12 months, unrealized losses | (340) | (509)
Total Estimated fair value | 6,343 | 9,882
Total, Unrealized Losses | (340) | (509)
Agency securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 35,685 | 23,306
Less than 12 months, Unrealized Losses | (409) | (686)
Total, Estimated Fair Value | 35,685 | 23,306
Total, Unrealized Losses | (409) | (686)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 10,445 | 7,468
Less than 12 months, unrealized losses | (213) | (220)
Total Estimated fair value | 10,445 | 7,468
Total, Unrealized Losses | (213) | (220)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 36,942 | 25,462
Less than 12 months, Unrealized Losses | (588) | (480)
Total, Estimated Fair Value | 36,942 | 25,462
Total, Unrealized Losses | (588) | (480)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 17,753 | 9,066
Less than 12 months, unrealized losses | (264) | (141)
Total Estimated fair value | 17,753 | 9,066
Total, Unrealized Losses | (264) | (141)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 52,675 | 33,164
Less than 12 months, Unrealized Losses | (671) | (614)
Total, Estimated Fair Value | 52,675 | 33,164
Total, Unrealized Losses | (671) | (614)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 20,547 | 6,035
Less than 12 months, unrealized losses | (242) | (119)
Total Estimated fair value | 20,547 | 6,035
Total, Unrealized Losses | (242) | (119)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 13,796 | 5,856
Less than 12 months, Unrealized Losses | (288) | (125)
12 months or longer, Estimated Fair Value | 1,331 | 2,225
12 months or longer, Unrealized Losses | (18) | (51)
Total, Estimated Fair Value | 15,127 | 8,081
Total, Unrealized Losses | (306) | (176)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 11,897 | 5,748
Less than 12 months, unrealized losses | (352) | (365)
Total Estimated fair value | 11,897 | 5,748
Total, Unrealized Losses | $ (352) | $ (365)

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