REAL ESTATE AND OTHER SECURITIES - Summary of Activity Related to Credit Losses on Debt Securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale debt securities at December 31, 2022	$ 10,816
Additions to the allowance for credit losses on securities for which credit losses were not previously recorded	0
Additions to the allowance for credit losses arising from purchases of available-for-sale debt securities accounted for as purchased financial assets with credit deterioration	0
Reductions for securities sold during the period	(221)
Reductions in the allowance for credit losses because the entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis	0
Additional increases (decreases) to the allowance for credit losses on securities that had credit losses, or an allowance recorded in a previous period	3,826
Write-offs charged against the allowance	0
Recoveries of amounts previously written off	0
Allowance for credit losses on available-for-sale debt securities at September 30, 2023	14,421
Purchased Credit Deteriorated
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale debt securities at December 31, 2022	4,140
Additions to the allowance for credit losses on securities for which credit losses were not previously recorded	0
Additions to the allowance for credit losses arising from purchases of available-for-sale debt securities accounted for as purchased financial assets with credit deterioration	0
Reductions for securities sold during the period	(221)
Reductions in the allowance for credit losses because the entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis	0
Additional increases (decreases) to the allowance for credit losses on securities that had credit losses, or an allowance recorded in a previous period	(158)
Write-offs charged against the allowance	0
Recoveries of amounts previously written off	0
Allowance for credit losses on available-for-sale debt securities at September 30, 2023	3,761
Non-Purchased Credit Deteriorated
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale debt securities at December 31, 2022	6,676
Additions to the allowance for credit losses on securities for which credit losses were not previously recorded	0
Additions to the allowance for credit losses arising from purchases of available-for-sale debt securities accounted for as purchased financial assets with credit deterioration	0
Reductions for securities sold during the period	0
Reductions in the allowance for credit losses because the entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis	0
Additional increases (decreases) to the allowance for credit losses on securities that had credit losses, or an allowance recorded in a previous period	3,984
Write-offs charged against the allowance	0
Recoveries of amounts previously written off	0
Allowance for credit losses on available-for-sale debt securities at September 30, 2023	$ 10,660