MORTGAGE LOANS RECEIVABLE - Schedule of Mortgage Loans Receivable (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Financing Receivable [Roll Forward]
Beginning balance	$ 290,180
Proceeds from repayments	(68,751)
Changes in instrument-specific credit risk	9,042
Other factors	(586)
Ending balance	217,593
Mortgage Loans Receivable
Financing Receivable [Roll Forward]
Beginning balance	1,515,762
Initial loan advances	828,032
Construction holdbacks and draws	240,031
Proceeds from repayments	(783,878)
Purchased loans premium amortization	(43,868)
Changes in instrument-specific credit risk	0
Other factors	0
Ending balance	$ 1,756,079