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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Additions and amortization: |  |  |  |
Amortization | $ 4,579 | $ 4,401 | $ 15,453 | $ 12,246
Changes in fair value of MSR assumptions | 747 | (2,960) | 7,186 | (21,970)
Ending balance | 61,206 |  | 61,206 |
Single family |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance | 59,872 | 47,804 | 49,966 | 68,109
Additions and amortization: |  |  |  |
Originations | 5,166 | 6,569 | 19,507 | 12,942
Amortization | (4,579) | (4,401) | (15,453) | (12,246)
Net additions and amortization | 587 | 2,168 | 4,054 | 696
Changes in fair value of MSR assumptions | 747 | (2,954) | 7,186 | (21,787)
Ending balance | $ 61,206 | $ 47,018 | $ 61,206 | $ 47,018

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