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