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LOANS RECEIVABLE - Summary of loans receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | $ 1,542,380 |  |  |
Deferred fees, costs and premiums and discounts, net |  |  | 2,747 |  |  |
Total loans | $ 1,581,745 |  | 1,545,127 |  |  |
Allowance for credit losses on loans | (14,413) | $ (14,153) | (13,400) | $ (14,050) | $ (13,465) | $ (14,425)
Loans receivable, net | 1,567,332 |  | 1,531,727 |  |  |
Residential one-to-four family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 597,254 |  |  |
Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 690,690 |  |  |
Non-residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 216,061 |  |  |
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 17,799 |  |  |
Junior liens |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 18,631 |  |  |
Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 4,653 |  |  |
Consumer and other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans |  |  | 39 |  |  |
Residential Portfolio Segment | Residential one-to-four family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 594,521 |  |  |
Total loans | 580,396 |  | 597,254 |  |  |
Allowance for credit losses on loans | (1,994) | (2,056) | (2,264) | (2,582) | (2,610) | (2,822)
Residential Portfolio Segment | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 690,278 |  |  |
Total loans | 696,956 |  | 690,690 |  |  |
Allowance for credit losses on loans | (7,017) | (7,191) | (5,491) | (5,139) | (4,776) | (5,263)
Nonresidential Portfolio Segment | Non-residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 216,394 |  |  |
Total loans | 237,247 |  | 216,061 |  |  |
Allowance for credit losses on loans | (3,813) | (3,570) | (3,357) | (3,640) | (3,465) | (2,846)
Construction and Land Portfolio Segment | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 17,990 |  |  |
Total loans | 36,032 |  | 17,799 |  |  |
Junior Lien Portfolio Segment | Junior liens |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 18,477 |  |  |
Total loans | 21,338 |  | 18,631 |  |  |
Allowance for credit losses on loans | (50) | (46) | (451) | (468) | (549) | (636)
Commercial Portfolio Segment | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans | (1,428) | $ (1,190) | (1,697) | $ (2,094) | $ (1,905) | $ (2,678)
Commercial Portfolio Segment | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 4,682 |  |  |
Total loans | 9,743 |  | 4,653 |  |  |
Consumer and Other Portfolio Segment | Consumer and other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total gross loans |  |  | 38 |  |  |
Total loans | $ 33 |  | $ 39 |  |  |

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