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Income Taxes - Schedule of Unrecognized Tax Benefits Roll Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
TXNM      
Unrecognized Tax Benefits [Roll Forward]      
Beginning balance $ 15,136 $ 15,154 $ 13,714
Additions based on tax positions 19   1,444
Reductions for tax positions of prior years (154)   (4)
Additions for tax positions of prior years   259  
Reductions based on tax positions   (277)  
Ending balance 15,001 15,136 15,154
PNM      
Unrecognized Tax Benefits [Roll Forward]      
Beginning balance 12,146 12,201 10,771
Additions based on tax positions 2   1,437
Reductions for tax positions of prior years (163)   (7)
Additions for tax positions of prior years   239  
Reductions based on tax positions   (294)  
Ending balance 11,985 12,146 12,201
TNMP      
Unrecognized Tax Benefits [Roll Forward]      
Beginning balance 188 151 141
Additions based on tax positions 17 17 7
Additions for tax positions of prior years 9 20 3
Ending balance $ 214 $ 188 $ 151