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INVESTMENT SECURITIES - Available for sale (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
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INVESTMENT SECURITIES |  |
Amortized Cost | $ 184,062 | $ 216,514
Gross Unrealized Gains | 1,109 | 2,301
Gross Unrealized Losses | (2,868) | (2,511)
Estimated Fair Value | 182,303 | 216,304
Municipal securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 44,174 | 23,883
Gross Unrealized Gains | 295 | 238
Gross Unrealized Losses | (617) | (555)
Estimated Fair Value | 43,852 | 23,566
Agency securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 43,842 | 25,996
Gross Unrealized Gains | 3 | 5
Gross Unrealized Losses | (860) | (686)
Estimated Fair Value | 42,985 | 25,315
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 37,307 | 55,826
Gross Unrealized Gains | 57 | 469
Gross Unrealized Losses | (907) | (480)
Estimated Fair Value | 36,457 | 55,815
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 18,704 | 71,787
Gross Unrealized Gains | 385 | 1,075
Gross Unrealized Losses | (31) | (614)
Estimated Fair Value | 19,058 | 72,248
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 40,035 | 39,022
Gross Unrealized Gains | 369 | 514
Gross Unrealized Losses | (453) | (176)
Estimated Fair Value | $ 39,951 | $ 39,360

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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