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MORTGAGE BANKING OPERATIONS - SF MSR Roll Forward (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Additions and amortization: |  |  |
Amortization | $ 19,669 | $ 17,754 | $ 20,670
Net additions and amortization | 4,239 | 1,670 | (168,826)
Changes in fair value assumptions | (7,379) | 19,955 | 16,224
Ending balance | 61,584 |  |
Single family |  |  |
Servicing Asset at Amortized Value, Balance [Roll Forward] |  |  |
Beginning balance | 49,966 | 68,109 | 252,168
Additions and amortization: |  |  |
Originations | 23,908 | 19,424 | 28,788
Sale | 0 | 0 | (176,944)
Amortization | (19,669) | (17,754) | (20,670)
Changes in fair value assumptions | 7,379 | (19,813) | (15,233)
Ending balance | $ 61,584 | $ 49,966 | $ 68,109

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