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Fair Value of Derivative and Other Financial Instruments - Maturities of Debt Securities (Details) - PNM $ in Thousands	Sep. 30, 2024 USD ($)
Available-for-Sale
Within 1 year	$ 30,203
After 1 year through 5 years	13,473
After 5 years through 10 years	8,807
After 10 years through 15 years	10,937
After 15 years through 20 years	7,333
After 20 years	509
Available-for-sale debt securities	$ 71,262

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

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