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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | $ 16,233 | $ 0
Less than 12 months, Unrealized Losses | (90) | 0
12 months or longer, Estimated Fair Value | 5,320 | 168,238
12 months or longer, Unrealized Losses | (101) | (3,526)
Total, Estimated Fair Value | 21,553 | 168,238
Total, Unrealized Losses | (191) | (3,526)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value |  | 0
Less than 12 months, Unrealized Losses |  | 0
12 months or longer, Estimated Fair Value |  | 6,554
12 months or longer, Unrealized Losses |  | (34)
Total, Estimated Fair Value |  | 6,554
Total, Unrealized Losses |  | (34)
Agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 1,998 | 0
Less than 12 months, Unrealized Losses | (10) | 0
12 months or longer, Estimated Fair Value | 0 | 6,861
12 months or longer, Unrealized Losses | 0 | (107)
Total, Estimated Fair Value | 1,998 | 6,861
Total, Unrealized Losses | (10) | (107)
Real estate mortgage investment conduits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value |  | 0
Less than 12 months, Unrealized Losses |  | 0
12 months or longer, Estimated Fair Value |  | 40,126
12 months or longer, Unrealized Losses |  | (673)
Total, Estimated Fair Value |  | 40,126
Total, Unrealized Losses |  | (673)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 2,509 | 0
Less than 12 months, Unrealized Losses | (22) | 0
12 months or longer, Estimated Fair Value | 409 | 74,288
12 months or longer, Unrealized Losses | (8) | (1,588)
Total, Estimated Fair Value | 2,918 | 74,288
Total, Unrealized Losses | (30) | (1,588)
Other mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Estimated Fair Value | 11,726 | 0
Less than 12 months, Unrealized Losses | (58) | 0
12 months or longer, Estimated Fair Value | 4,911 | 40,409
12 months or longer, Unrealized Losses | (93) | (1,124)
Total, Estimated Fair Value | 16,637 | 40,409
Total, Unrealized Losses | $ (151) | $ (1,124)

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