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Stock-Based Compensation - Schedule of All Excess Tax Benefits and Deficiencies are Recorded to Tax Expense and Classified as Operating Cash Flows to Reduce Taxes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
PNM
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess Tax Benefits (Deficiencies)	$ 10	$ 185	$ (65)
TNMP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess Tax Benefits (Deficiencies)	4	76	(26)
TXNM
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess Tax Benefits (Deficiencies)	$ 17	$ 261	$ (91)

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

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