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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Less than 12 months, Estimated Fair Value |  | $ 105,317 |  | $ 16,233 |
Less than 12 months, Unrealized Losses |  | (2,460) |  | (90) |
12 months or longer, Estimated Fair Value |  | 2,225 |  | 5,320 |
12 months or longer, Unrealized Losses |  | (51) |  | (101) |
Total, Estimated Fair Value |  | 107,542 |  | 21,553 |
Total, Unrealized Losses |  | (2,511) |  | (191) |
Debt Securities, Held to maturity |  |  |  |  |
Less than 12 months, Estimated fair value |  | 38,199 |  |  |
Less than 12 months, unrealized losses |  | (1,354) |  |  |
Total Estimated fair value |  | 38,199 |  |  |
Total, Unrealized Losses |  | (1,354) |  |  |
Municipal securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Less than 12 months, Estimated Fair Value |  | 17,529 |  |  |
Less than 12 months, Unrealized Losses |  | (555) |  |  |
Total, Estimated Fair Value |  | 17,529 |  |  |
Total, Unrealized Losses |  | (555) |  |  |
Debt Securities, Held to maturity |  |  |  |  |
Less than 12 months, Estimated fair value |  | 9,882 |  |  |
Less than 12 months, unrealized losses |  | (509) |  |  |
Total Estimated fair value |  | 9,882 |  |  |
Total, Unrealized Losses |  | (509) |  |  |
Agency securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Less than 12 months, Estimated Fair Value |  | 23,306 |  | 1,998 |
Less than 12 months, Unrealized Losses |  | (686) |  | (10) |
Total, Estimated Fair Value |  | 23,306 |  | 1,998 |
Total, Unrealized Losses |  | (686) |  | (10) |
Debt Securities, Held to maturity |  |  |  |  |
Less than 12 months, Estimated fair value |  | 7,468 |  |  |
Less than 12 months, unrealized losses |  | (220) |  |  |
Total Estimated fair value |  | 7,468 |  |  |
Total, Unrealized Losses |  | (220) |  |  |
Real estate mortgage investment conduits |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Less than 12 months, Estimated Fair Value | [1] | 25,462 |  |  |
Less than 12 months, Unrealized Losses | [1] | (480) |  |  |
Total, Estimated Fair Value | [1] | 25,462 |  |  |
Total, Unrealized Losses | [1] | (480) |  |  |
Debt Securities, Held to maturity |  |  |  |  |
Less than 12 months, Estimated fair value | [2] | 9,066 |  |  |
Less than 12 months, unrealized losses | [2] | (141) |  |  |
Total Estimated fair value | [2] | 9,066 |  |  |
Total, Unrealized Losses | [2] | (141) |  |  |
Residential mortgage-backed securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Less than 12 months, Estimated Fair Value |  | 33,164 |  | 2,509 | [3]
Less than 12 months, Unrealized Losses |  | (614) |  | (22) | [3]
12 months or longer, Estimated Fair Value | [3] |  |  | 409 |
12 months or longer, Unrealized Losses | [3] |  |  | (8) |
Total, Estimated Fair Value |  | 33,164 |  | 2,918 | [3]
Total, Unrealized Losses |  | (614) |  | (30) | [3]
Debt Securities, Held to maturity |  |  |  |  |
Less than 12 months, Estimated fair value | [3] | 6,035 |  |  |
Less than 12 months, unrealized losses | [3] | (119) |  |  |
Total Estimated fair value | [3] | 6,035 |  |  |
Total, Unrealized Losses | [3] | (119) |  |  |
Other mortgage-backed securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Less than 12 months, Estimated Fair Value |  | 5,856 | [4] | 11,726 | [5]
Less than 12 months, Unrealized Losses |  | (125) | [4] | (58) | [5]
12 months or longer, Estimated Fair Value |  | 2,225 | [4] | 4,911 | [5]
12 months or longer, Unrealized Losses |  | (51) | [4] | (93) | [5]
Total, Estimated Fair Value |  | 8,081 | [4] | 16,637 | [5]
Total, Unrealized Losses |  | (176) | [4] | $ (151) | [5]
Debt Securities, Held to maturity |  |  |  |  |
Less than 12 months, Estimated fair value |  | 5,748 |  |  |
Less than 12 months, unrealized losses |  | (365) |  |  |
Total Estimated fair value |  | 5,748 |  |  |
Total, Unrealized Losses |  | $ (365) |  |  |
[1] | Comprised of FHLMC, FNMA and GNMA issued securities.
[2] | Comprised of FNMA issued securities.
[3] | Comprised of FHLMC and FNMA issued securities.
[4] | Comprised of SBA issued securities.
[5] | Comprised of SBA and CRE secured securities issued by FNMA.

X
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