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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) - PNMR and PNM $ in Thousands	Jun. 30, 2024 USD ($)
Available-for-Sale
Within 1 year	$ 26,903
After 1 year through 5 years	11,678
After 5 years through 10 years	9,426
After 10 years through 15 years	10,668
After 15 years through 20 years	5,467
After 20 years	497
Available-for-sale debt securities	$ 64,639

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