INVESTMENT SECURITIES - General Information (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended		46 Months Ended
	Nov. 26, 2019	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023
Marketable Securities [Line Items]
Investment in Alpine Income Property Trust, Inc.		$ 38,162	$ 38,162	$ 42,041		$ 38,162
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units
Marketable Securities [Line Items]
Number of shares owned		2,330,000	2,330,000			2,330,000
Investment in Alpine Income Property Trust, Inc.		$ 38,162	$ 38,162	$ 42,041		$ 38,162
Investment ownership percentage (as a percent)		15.10%	15.10%			15.10%
Common Stock [Member]
Marketable Securities [Line Items]
Share purchased	421,053	0	129,271	155,665	8,088	1,108,814
Investment in Alpine Income Property Trust, Inc.		$ 18,140	$ 18,140	$ 18,690		$ 18,140
Investment ownership percentage (as a percent)		7.20%	7.20%			7.20%
Alpine Income Property OP, LP Limited Partnership Units
Marketable Securities [Line Items]
Share purchased			1,223,854			1,200,000
Investment ownership percentage (as a percent)		7.90%	7.90%			7.90%