DERIVATIVE AND HEDGING ACTIVITIES - Summary of Interest Rate Swap Terms (Details) - Cash Flow Hedging - Designated as Hedging Instrument - American Assets Trust, L.P.	Mar. 31, 2024 USD ($)
Bank of America, N.A. | Interest Rate Swap, 1/5/2027
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 50,000,000
Interest rate swap asset	3,738,000
Wells Fargo Bank, N.A. | Interest Rate Swap, 1/5/2027
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	50,000,000
Interest rate swap asset	3,899,000
Wells Fargo Bank, N.A. | Interest Rate Swap, 1/5/2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	150,000,000
Interest rate swap asset	1,352,000
Mizuho Capital Markets LLC | Interest Rate Swap, 1/5/2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	75,000,000
Interest rate swap asset	$ 366,000