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MORTGAGE BANKING OPERATIONS - Narrative (Details) $ in Thousands | 12 Months Ended |  |
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Dec. 31, 2021 USD ($) | Dec. 31, 2019 USD ($) saleOfRight | Dec. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) saleOfRight
Mortgage Banking Operations (Narrative) [Abstract] |  |  |  |
Servicing advances | $ 1,900 |  | $ 3,000 |
Other assets - GNMA EBO loans | $ 5,495,726 |  | 5,179,886 |
Multifamily |  |  |  |
Mortgage Banking Operations (Narrative) [Abstract] |  |  |  |
Expected weighted average life of MSR | 11 years 5 months 19 days |  |  |
Ginnie Mae Early Buyout Loans |  |  |  |
Mortgage Banking Operations (Narrative) [Abstract] |  |  |  |
Other assets - GNMA EBO loans | $ 12,000 |  | $ 102,000 |
Single family | Agency debentures |  |  |  |
Mortgage Banking Operations (Narrative) [Abstract] |  |  |  |
Mortgage servicing rights, unpaid principle balance, sold, number of sales | saleOfRight |  | 2 |  | 2
Mortgage servicing rights, unpaid principal balance, sold |  | $ 14,300,000 |  | $ 14,300,000
Gain (loss) in income during period from discontinued operations before income taxes |  | (900) |  |
Single family | Single family residential mortgage servicing rights |  |  |  |
Mortgage Banking Operations (Narrative) [Abstract] |  |  |  |
Gain (loss) in income during period from discontinued operations before income taxes |  | $ (900) |  |

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