Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) - PNMR and PNM $ in Thousands	Mar. 31, 2023 USD ($)
Available-for-Sale
Within 1 year	$ 43,173
After 1 year through 5 years	67,527
After 5 years through 10 years	70,236
After 10 years through 15 years	17,967
After 15 years through 20 years	12,495
After 20 years	32,568
Available-for-sale debt securities	$ 243,966

Available-for-sale Securities, Debt Maturities, after Fifteen Years Through Twenty Years, Fair Value

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- Definition

Available-for-sale Securities, Debt Maturities, after Ten Years Through Fifteen Years, Fair Value

+ References

No definition available.

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- Definition

Available-for-sale Securities, Debt Maturities, after Twenty Years, Fair Value

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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 sixth through tenth 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 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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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