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Financing - Borrowing Arrangements Between TXNM and its Subsidiaries (Narrative) (Details) - Related Party - USD ($)	Dec. 31, 2024	Dec. 31, 2023
PNM and TNMP
Debt Instrument [Line Items]
Notes payable	$ 0	$ 0
PNMR Development
Debt Instrument [Line Items]
Notes payable	0	2,300,000
TXNM
Debt Instrument [Line Items]
Notes payable	1,500,000	$ 0
Maximum
Debt Instrument [Line Items]
Notes payable	$ 150,000,000.0

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