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MORTGAGE BANKING OPERATIONS - Single Family MSR Roll Forward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Additions and amortization: |  |  |  |
Amortization | $ 2,112 | $ 4,579 | $ 8,052 | $ 15,453
Changes in fair value of MSR assumptions | 1,989 | 747 | 16,615 | 7,186
Ending balance | 77,811 |  | 77,811 |
Single family |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance | 76,481 | 59,872 | 61,584 | 49,966
Additions and amortization: |  |  |  |
Originations | 1,453 | 5,166 | 7,664 | 19,507
Amortization | (2,112) | (4,579) | (8,052) | (15,453)
Net additions and amortization | (659) | 587 | (388) | 4,054
Changes in fair value of MSR assumptions | 1,989 | 747 | 16,615 | 7,186
Ending balance | $ 77,811 | $ 61,206 | $ 77,811 | $ 61,206

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