EXPENSES, REALIZED AND UNREALIZED GAINS (LOSSES) ON INVESTMENTS AND OTHER - Schedule of Accretion and Other Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accretion and other amortization:
Accretion of net discount on securities and loans	$ 11,684	$ 5,293
Accretion of servicer advances receivable discount and servicer advance investments	4,630	4,156
Accretion of excess mortgage servicing rights income	3,431	13,017
Amortization of deferred financing costs	(1,055)	(6,921)
Total accretion and other amortization	18,270	15,095
Corporate Debt
Accretion and other amortization:
Amortization of discount on corporate debt	$ (420)	$ (450)