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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) - PNMR and PNM $ in Thousands	Mar. 31, 2022 USD ($)
Available-for-Sale
Within 1 year	$ 32,919
After 1 year through 5 years	70,710
After 5 years through 10 years	87,507
After 10 years through 15 years	16,377
After 15 years through 20 years	12,815
After 20 years	34,865
Available-for-sale debt securities	$ 255,193

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- Definition

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