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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Additions and amortization: |  |  |  |
Amortization | $ 5,181 | $ 4,351 | $ 10,874 | $ 7,845
Changes in fair value of MSR assumptions | 5,024 | 2,166 | (6,439) | 19,010
Ending balance | 59,872 |  | 59,872 |
Single family |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance | 62,352 | 49,933 | 49,966 | 68,109
Additions and amortization: |  |  |  |
Originations | 7,725 | 4,211 | 14,341 | 6,373
Amortization | (5,181) | (4,351) | (10,874) | (7,845)
Net additions and amortization | 2,544 | (140) | 3,467 | (1,472)
Changes in fair value of MSR assumptions | (5,024) | (1,989) | 6,439 | (18,833)
Ending balance | $ 59,872 | $ 47,804 | $ 59,872 | $ 47,804

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