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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | $ 120,190 | $ 105,317
Less than 12 months, Unrealized Losses | (1,370) | (2,460)
12 months or longer, Estimated Fair Value | 1,993 | 2,225
12 months or longer, Unrealized Losses | (44) | (51)
Total, Estimated Fair Value | 122,183 | 107,542
Total, Unrealized Losses | (1,414) | (2,511)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 34,912 | 38,199
Less than 12 months, unrealized losses | (597) | (1,354)
Total Estimated fair value | 34,912 | 38,199
Total, Unrealized Losses | (597) | (1,354)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 12,971 | 17,529
Less than 12 months, Unrealized Losses | (213) | (555)
Total, Estimated Fair Value | 12,971 | 17,529
Total, Unrealized Losses | (213) | (555)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 6,511 | 9,882
Less than 12 months, unrealized losses | (177) | (509)
Total Estimated fair value | 6,511 | 9,882
Total, Unrealized Losses | (177) | (509)
Agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 20,577 | 23,306
Less than 12 months, Unrealized Losses | (392) | (686)
Total, Estimated Fair Value | 20,577 | 23,306
Total, Unrealized Losses | (392) | (686)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 7,570 | 7,468
Less than 12 months, unrealized losses | (105) | (220)
Total Estimated fair value | 7,570 | 7,468
Total, Unrealized Losses | (105) | (220)
Real estate mortgage investment conduits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 38,492 | 25,462
Less than 12 months, Unrealized Losses | (411) | (480)
Total, Estimated Fair Value | 38,492 | 25,462
Total, Unrealized Losses | (411) | (480)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 8,991 | 9,066
Less than 12 months, unrealized losses | (77) | (141)
Total Estimated fair value | 8,991 | 9,066
Total, Unrealized Losses | (77) | (141)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 45,122 | 33,164
Less than 12 months, Unrealized Losses | (349) | (614)
Total, Estimated Fair Value | 45,122 | 33,164
Total, Unrealized Losses | (349) | (614)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 5,895 | 6,035
Less than 12 months, unrealized losses | (75) | (119)
Total Estimated fair value | 5,895 | 6,035
Total, Unrealized Losses | (75) | (119)
Other mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 3,028 | 5,856
Less than 12 months, Unrealized Losses | (5) | (125)
12 months or longer, Estimated Fair Value | 1,993 | 2,225
12 months or longer, Unrealized Losses | (44) | (51)
Total, Estimated Fair Value | 5,021 | 8,081
Total, Unrealized Losses | (49) | (176)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 5,945 | 5,748
Less than 12 months, unrealized losses | (163) | (365)
Total Estimated fair value | 5,945 | 5,748
Total, Unrealized Losses | $ (163) | $ (365)

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