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Income Taxes - Schedule of Impairments of Tax Attributes After Reflecting the Expiration of Carryforwards Under Applicable Tax Laws, Net of Federal Tax Benefit and Reserve Balances, After Reflecting Expiration of Carryforwards Under Applicable Tax Laws (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes, Impairment of Carryforwards      
Federal tax credit carryforwards $ 131 $ 839 $ 187
Compensation expense (516) 387 199
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 2,186 2,055  
Compensation expense 596 1,112  
PNM      
Income Taxes, Impairment of Carryforwards      
Federal tax credit carryforwards 0 (427) 427
Compensation expense (335) 246 140
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 0 0  
Compensation expense 394 729  
TNMP      
Income Taxes, Impairment of Carryforwards      
Federal tax credit carryforwards 0 0 0
Compensation expense (179) 140 $ 59
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 0 0  
Compensation expense $ 202 $ 381