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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |
Allowance for unfunded commitments | $ 1,800,000 | $ 2,200,000 |
Asset Pledged as Collateral | Federal Home Loan Bank Advances |  |  |
Loss Contingencies [Line Items] |  |  |
Letters of credit outstanding | 135,000,000 |  |
Loss Sharing Relationship |  |  |
Loss Contingencies [Line Items] |  |  |
Reserve liability related to multifamily DUS Program | 500,000 | 600,000 |
Multifamily | Loss Sharing Relationship |  |  |
Loss Contingencies [Line Items] |  |  |
UPB of loans sold through DUS | 1,800,000,000 | 1,800,000,000 |
Loss incurred - related to DUS | 0 | 0 | $ 0
Investment commitment |  |  |
Loss Contingencies [Line Items] |  |  |
Investment in qualifying small businesses | $ 10,700,000 | $ 11,800,000 |

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