FAIR VALUE OF ASSETS AND LIABILITIES - Summary of assets and liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financial assets
Securities available-for-sale:	$ 290,806	$ 283,766
U.S. Treasury notes
Financial assets
Securities available-for-sale:	35,617	35,060
Corporate bonds
Financial assets
Securities available-for-sale:	73,705	76,623
U.S. Government agency obligations
Financial assets
Securities available-for-sale:	1,040	11,140
Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	6,130	6,195
Residential
Financial assets
Securities available-for-sale:	149,731	128,542
Multifamily
Financial assets
Securities available-for-sale:	10,329	11,523
Asset-backed securities
Financial assets
Securities available-for-sale:	14,254	14,683
Measured on a recurring basis:
Financial assets
Securities available-for-sale:	290,806	283,766
Derivatives	5,978	9,047
Financial assets	296,784	292,813
Financial liabilities
Derivatives	1,975	1,465
Measured on a nonrecurring basis:
Derivatives	5,978	9,047
Measured on a recurring basis: | U.S. Treasury notes
Financial assets
Securities available-for-sale:	35,617	35,060
Measured on a recurring basis: | Corporate bonds
Financial assets
Securities available-for-sale:	73,705	76,623
Measured on a recurring basis: | U.S. Government agency obligations
Financial assets
Securities available-for-sale:	1,040	11,140
Measured on a recurring basis: | Obligations issued by U.S. states and their political subdivisions
Financial assets
Securities available-for-sale:	6,130	6,195
Measured on a recurring basis: | Residential
Financial assets
Securities available-for-sale:	149,731	128,542
Measured on a recurring basis: | Multifamily
Financial assets
Securities available-for-sale:	10,329	11,523
Measured on a recurring basis: | Asset-backed securities
Financial assets
Securities available-for-sale:	14,254	14,683
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets
Financial assets
Securities available-for-sale:	36,657	46,200
Derivatives	0	0
Financial assets	36,657	46,200
Financial liabilities
Derivatives	0	0
Measured on a nonrecurring basis:
Derivatives	0	0
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets | U.S. Treasury notes
Financial assets
Securities available-for-sale:	35,617	35,060
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:	1,040	11,140
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
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:	254,149	237,566
Derivatives	5,978	9,047
Financial assets	260,127	246,613
Financial liabilities
Derivatives	1,975	1,465
Measured on a nonrecurring basis:
Derivatives	5,978	9,047
Measured on a recurring basis: | Significant Other Observable Inputs | U.S. Treasury notes
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:	73,705	76,623
Measured on a recurring basis: | Significant Other Observable Inputs | U.S. Government agency obligations
Financial assets
Securities available-for-sale:	0	0
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:	6,130	6,195
Measured on a recurring basis: | Significant Other Observable Inputs | Residential
Financial assets
Securities available-for-sale:	149,731	128,542
Measured on a recurring basis: | Significant Other Observable Inputs | Multifamily
Financial assets
Securities available-for-sale:	10,329	11,523
Measured on a recurring basis: | Significant Other Observable Inputs | Asset-backed securities
Financial assets
Securities available-for-sale:	14,254	14,683
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 nonrecurring basis:
Derivatives	0	0
Measured on a recurring basis: | Significant Unobservable Inputs | U.S. Treasury notes
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
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: | Real estate owned
Financial assets
Derivatives	0	593
Measured on a nonrecurring basis:
Derivatives	0	593
Measured on a nonrecurring basis: | Quoted Prices in Active Markets for Identical Assets | Real estate owned
Financial assets
Derivatives	0	0
Measured on a nonrecurring basis:
Derivatives	0	0
Measured on a nonrecurring basis: | Significant Other Observable Inputs | Real estate owned
Financial assets
Derivatives	0	0
Measured on a nonrecurring basis:
Derivatives	0	0
Measured on a nonrecurring basis: | Significant Unobservable Inputs | Real estate owned
Financial assets
Derivatives	0	593
Measured on a nonrecurring basis:
Derivatives	$ 0	$ 593