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Fair Value of Derivative and Other Financial Instruments - Overview and Commodity Derivatives (Details) - PNM - Designated as Hedging Instrument - Commodity derivatives - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Other current assets | $ 1,008 | $ 1,096
Other deferred charges | 0 | 455
Derivative asset | 1,008 | 1,551
Other current liabilities | (1,008) | (1,096)
Other deferred credits | 0 | (455)
Derivative liability | (1,008) | (1,551)
Net | $ 0 | $ 0

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