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Stock-Based Compensation - Excess Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
PNM
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits	$ 185	$ (65)	$ 564
TNMP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits	76	(26)	224
PNMR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefits	$ 261	$ (91)	$ 788

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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