FAIR VALUE OF ASSETS AND LIABILITIES - Summary of assets and liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financial assets
Securities available-for-sale:	$ 300,923	$ 314,248
U.S. Treasury Note
Financial assets
Securities available-for-sale:	44,110	43,759
Corporate bonds
Financial assets
Securities available-for-sale:	75,000	76,298
U.S. Government agency obligations
Financial assets
Securities available-for-sale:	14,697	15,423
Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	16,134	16,268
Residential one-to-four family
Financial assets
Securities available-for-sale:	133,592	140,186
Multifamily
Financial assets
Securities available-for-sale:	13,171	18,158
Asset-backed securities
Financial assets
Securities available-for-sale:	4,219	4,156
Measured on a recurring basis:
Financial assets
Securities available-for-sale:	300,923	314,248
Derivatives	12,527	11,091
Financial assets	313,450	325,339
Financial Liabilities
Derivatives	77	0
Measured on a recurring basis: | U.S. Treasury Note
Financial assets
Securities available-for-sale:	44,110	43,759
Measured on a recurring basis: | Corporate bonds
Financial assets
Securities available-for-sale:	75,000	76,298
Measured on a recurring basis: | U.S. Government agency obligations
Financial assets
Securities available-for-sale:	14,697	15,423
Measured on a recurring basis: | Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	16,134	16,268
Measured on a recurring basis: | Residential one-to-four family
Financial assets
Securities available-for-sale:	133,592	140,186
Measured on a recurring basis: | Multifamily
Financial assets
Securities available-for-sale:	13,171	18,158
Measured on a recurring basis: | Asset-backed securities
Financial assets
Securities available-for-sale:	4,219	4,156
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets
Financial assets
Securities available-for-sale:	55,330	55,054
Derivatives	0	0
Financial assets	55,330	55,054
Financial Liabilities
Derivatives	0	0
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | U.S. Treasury Note
Financial assets
Securities available-for-sale:	44,110	43,759
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Corporate bonds
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | U.S. Government agency obligations
Financial assets
Securities available-for-sale:	11,220	11,295
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Residential one-to-four family
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Multifamily
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | Asset-backed securities
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Other Observable Inputs
Financial assets
Securities available-for-sale:	245,593	259,194
Derivatives	12,527	11,091
Financial assets	258,120	270,285
Financial Liabilities
Derivatives	77	0
Measured on a recurring basis: | Significant Other Observable Inputs | U.S. Treasury Note
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Other Observable Inputs | Corporate bonds
Financial assets
Securities available-for-sale:	75,000	76,298
Measured on a recurring basis: | Significant Other Observable Inputs | U.S. Government agency obligations
Financial assets
Securities available-for-sale:	3,477	4,128
Measured on a recurring basis: | Significant Other Observable Inputs | Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	16,134	16,268
Measured on a recurring basis: | Significant Other Observable Inputs | Residential one-to-four family
Financial assets
Securities available-for-sale:	133,592	140,186
Measured on a recurring basis: | Significant Other Observable Inputs | Multifamily
Financial assets
Securities available-for-sale:	13,171	18,158
Measured on a recurring basis: | Significant Other Observable Inputs | Asset-backed securities
Financial assets
Securities available-for-sale:	4,219	4,156
Measured on a recurring basis: | Significant Unobservable Inputs
Financial assets
Securities available-for-sale:	0	0
Derivatives	0	0
Financial assets	0	0
Financial Liabilities
Derivatives	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | U.S. Treasury Note
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | Corporate bonds
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | U.S. Government agency obligations
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | Residential one-to-four family
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | Multifamily
Financial assets
Securities available-for-sale:	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | Asset-backed securities
Financial assets
Securities available-for-sale:	$ 0	0
Measured on a nonrecurring basis: | Assets held for sale
Financial assets
Derivatives		917
Measured on a nonrecurring basis: | Quoted Prices in Active Markets for Identical Assets | Assets held for sale
Financial assets
Derivatives		0
Measured on a nonrecurring basis: | Significant Other Observable Inputs | Assets held for sale
Financial assets
Derivatives		917
Measured on a nonrecurring basis: | Significant Unobservable Inputs | Assets held for sale
Financial assets
Derivatives		$ 0