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Fair Value of Derivative and Other Financial Instruments - Schedule of Maturities of Debt Securities (Details) - PNM $ in Thousands	Jun. 30, 2025 USD ($)
Available-for-Sale
Within 1 year	$ 40,966
After 1 year through 5 years	9,554
Available-for-sale debt securities	$ 50,520

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- Definition

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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