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SALES OF BRANCH, SUBSIDIARY AND BUSINESS UNITS - Banc Home Loans Sale Additional Information (Details) - USD ($) |  | 12 Months Ended | 45 Months Ended
--- | --- | --- | ---
Mar. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net gain on disposal |  | $ 0 | $ 0 | $ 1,439,000 |
Banc home loans | Disposals |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash premium payment | $ 25,000,000.0 |  |  |  |
Book value of certain assets sold | $ 2,500,000 |  |  |  |
Performance period following completion of transaction | 38 months |  |  |  |
Net gain on disposal |  | 0 | 0 | $ 1,439,000 | $ 15,235,000
Assets of discontinued operations |  | 0 | 0 |  | 0
Liabilities of discontinued operations |  | $ 0 | $ 0 |  | $ 0

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