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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) - PNM $ in Thousands	Mar. 31, 2025 USD ($)
Available-for-Sale
Within 1 year	$ 47,960
After 1 year through 5 years	6,724
Available-for-sale debt securities	$ 54,684

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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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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 next 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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