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SALE OF COMMERCIAL REAL ESTATE BUSINESS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 25, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business divestiture-related gains (losses) |  | $ (278,559) | $ 0 | $ 0 |
Assets of disposal group held for sale |  | 194,138 | 0 |  |
Liabilities of disposal group held for sale |  | 154,956 | 0 |  |
CRE Business | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Sale of business |  |  |  |  | $ 2,330,000
Goodwill, impairment loss |  | 71,800 |  |  |
Reversal of loan loss provision | $ 135,000 |  |  |  |
Unfunded loan commitments | $ 5,100 |  |  |  |
Pretax loss |  | (31,600) | $ (99,600) |  |
Assets of disposal group held for sale |  | 194,100 |  |  |
Liabilities of disposal group held for sale |  | 154,900 |  |  |
Real Estate Property Excluded From Slate Transaction | Discontinued Operations, Disposed of by Sale |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Business divestiture-related gains (losses) |  | $ 4,800 |  |  |

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