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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 10, 2023 USD ($) branch | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) segment | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($)
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Number of reporting segments | segment |  |  |  |  | 1 |  |
Goodwill |  | $ 0 |  |  | $ 0 |  | $ 27,900
Goodwill impairment charge |  | $ 0 | $ 39,900 | $ 0 | $ 39,857 | $ 0 |
California | Three Branches Purchase |  |  |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches purchased | branch | 3 |  |  |  |  |  |
Deposit liabilities assumed | $ 376,000 |  |  |  |  |  |
Acquired receivables | 21,000 |  |  |  |  |  |
Goodwill | 12,000 |  |  |  |  |  |
Intangible assets acquired | $ 11,000 |  |  |  |  |  |

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