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FAIR VALUE MEASUREMENTS - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Carrying Amount | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | $ 265,408 | $ 41,968
Carrying Amount | Certificates of deposit held for investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 249 | 249
Carrying Amount | Loans held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 275
Carrying Amount | Investment securities available for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 216,304 | 148,291
Carrying Amount | Investment securities held to maturity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 39,574 | 28
Carrying Amount | Loans receivable, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 924,057 | 898,885
Carrying Amount | FHLB stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 1,722 | 1,420
Carrying Amount | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 120,625 | 134,941
Carrying Amount | Junior subordinated debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 26,748 | 26,662
Estimated Fair Value | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 265,408 | 41,968
Estimated Fair Value | Certificates of deposit held for investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 262 | 258
Estimated Fair Value | Loans held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 275
Estimated Fair Value | Investment securities available for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 216,304 | 148,291
Estimated Fair Value | Investment securities held to maturity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 38,220 | 28
Estimated Fair Value | Loans receivable, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 920,102 | 889,398
Estimated Fair Value | FHLB stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 1,722 | 1,420
Estimated Fair Value | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 121,610 | 136,997
Estimated Fair Value | Junior subordinated debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 14,434 | 12,127
Level 1 | Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 265,408 | 41,968
Level 2 | Certificates of deposit held for investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 262 | 258
Level 2 | Loans held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets |  | 275
Level 2 | Investment securities available for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 216,304 | 148,291
Level 2 | Investment securities held to maturity |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 38,220 | 28
Level 2 | FHLB stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 1,722 | 1,420
Level 2 | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | 121,610 | 136,997
Level 3 | Loans receivable, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets | 920,102 | 889,398
Level 3 | Junior subordinated debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities | $ 14,434 | $ 12,127

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