SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Issued Accounting Standards (Details) $ in Millions	Dec. 31, 2021 USD ($)
Commercial loan and master lease investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current expected credit losses reserve	$ 0.3
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020