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FAIR VALUE OF ASSETS AND LIABILITIES - Summary of assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | $ 324,892 | $ 244,587 |
Real estate owned |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate held for sale |  |  | $ 624
U.S. Treasury Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 36,832 | 10,000 |
Domestic Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 87,619 | 59,341 |
U.S. Government agency obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 23,329 | 19,675 |
Obligations issued by U.S. states and their political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 20,324 | 24,795 |
Residential one-to-four family |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 114,401 | 72,716 |
Multifamily |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 35,916 | 58,060 |
Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 6,471 |  |
Measured on a recurring basis: |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets | 324,892 |  |
Financial Liabilities | 246 | 5,545 |
Nonfinancial assets |  | (244,587) |
Measured on a recurring basis: | U.S. Treasury Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 36,832 | 10,000 |
Measured on a recurring basis: | Domestic Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 87,619 | 59,341 |
Measured on a recurring basis: | U.S. Government agency obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 23,329 | 19,675 |
Measured on a recurring basis: | Obligations issued by U.S. states and their political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 20,324 | 24,795 |
Measured on a recurring basis: | Residential one-to-four family |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 114,401 | 72,716 |
Measured on a recurring basis: | Multifamily |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 35,916 | 58,060 |
Measured on a recurring basis: | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 6,471 |  |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets | 54,449 |  |
Financial Liabilities | 0 | 0 |
Nonfinancial assets |  | (22,417) |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | U.S. Treasury Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 36,832 | 10,000 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Domestic Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | U.S. Government agency obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 17,617 | 12,417 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Obligations issued by U.S. states and their political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Residential one-to-four family |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Multifamily |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 |  |
Measured on a recurring basis: | Significant Other Observable Inputs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets | 270,443 |  |
Financial Liabilities | 246 | 5,545 |
Nonfinancial assets |  | (222,170) |
Measured on a recurring basis: | Significant Other Observable Inputs | U.S. Treasury Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Other Observable Inputs | Domestic Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 87,619 | 59,341 |
Measured on a recurring basis: | Significant Other Observable Inputs | U.S. Government agency obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 5,712 | 7,258 |
Measured on a recurring basis: | Significant Other Observable Inputs | Obligations issued by U.S. states and their political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 20,324 | 24,795 |
Measured on a recurring basis: | Significant Other Observable Inputs | Residential one-to-four family |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 114,401 | 72,716 |
Measured on a recurring basis: | Significant Other Observable Inputs | Multifamily |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 35,916 | 58,060 |
Measured on a recurring basis: | Significant Other Observable Inputs | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 6,471 |  |
Measured on a recurring basis: | Significant Unobservable Inputs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial assets | 0 |  |
Financial Liabilities | 0 | 0 |
Nonfinancial assets |  | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | U.S. Treasury Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | Domestic Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | U.S. Government agency obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | Obligations issued by U.S. states and their political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | Residential one-to-four family |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | Multifamily |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | 0 | 0 |
Measured on a recurring basis: | Significant Unobservable Inputs | Asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale: | $ 0 |  |
Measured on a nonrecurring basis: | Assets held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 5,295 |
Measured on a nonrecurring basis: | Real estate owned |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 624 |
Measured on a nonrecurring basis: | Quoted Prices in Active Markets for Identical Assets | Assets held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 0 |
Measured on a nonrecurring basis: | Quoted Prices in Active Markets for Identical Assets | Real estate owned |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 0 |
Measured on a nonrecurring basis: | Significant Other Observable Inputs | Assets held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 5,295 |
Measured on a nonrecurring basis: | Significant Other Observable Inputs | Real estate owned |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 624 |
Measured on a nonrecurring basis: | Significant Unobservable Inputs | Assets held for sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | 0 |
Measured on a nonrecurring basis: | Significant Unobservable Inputs | Real estate owned |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Nonfinancial assets |  | $ 0 |

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