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EXCESS MORTGAGE SERVICING RIGHTS ASSETS - Summary of Equity Method Investees Changed - Roll Forward (Details) - Recurring Basis
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Increase (Decrease) in Equity Method Investments [Roll Forward]  
Beginning balance $ 99,917
Distributions of capital from equity method investees (12,230)
Change in fair value of investments in equity method investees 1,421
Ending balance $ 89,108