DERIVATIVE AND HEDGING ACTIVITIES - Summary of Interest Rate Swap Terms (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap asset	$ 7,963	$ 9,986
Bank of America, N.A. | Interest Rate Swap, 1/5/2027 | Cash Flow Hedging | Designated as Hedging Instrument | American Assets Trust, L.P.
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	50,000
Interest rate swap asset	3,317
Wells Fargo Bank, N.A. | Interest Rate Swap, 1/5/2027 | Cash Flow Hedging | Designated as Hedging Instrument | American Assets Trust, L.P.
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	50,000
Interest rate swap asset	3,320
Wells Fargo Bank, N.A. | Interest Rate Swap, 1/5/2025 | Cash Flow Hedging | Designated as Hedging Instrument | American Assets Trust, L.P.
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	150,000
Interest rate swap asset	1,150
Mizuho Capital Markets LLC | Interest Rate Swap, 1/5/2025 | Cash Flow Hedging | Designated as Hedging Instrument | American Assets Trust, L.P.
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	75,000
Interest rate swap asset	$ 176