v3.26.3
Fair Value of Derivative and Other Financial Instruments - Schedule of Gross Realized Gains and Losses (Details) - PNM - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Debt Securities, Available-for-sale [Line Items]        
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings $ 100,000 $ 0 $ 100,000 $ 0
Proceeds from sales 95,253,000 241,992,000 424,925,000 440,720,000
Gross realized gains 5,453,000 18,320,000 29,407,000 33,862,000
Gross realized (losses) $ (616,000) $ (4,882,000) $ (8,303,000) $ (6,491,000)