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Income Taxes - Carryforwards (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes, Impairment of Carryforwards      
Federal tax credit carryforwards $ 839 $ 187 $ 1,029
Compensation expense 387 199 119
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 2,055 1,216  
Compensation expense 1,112 725  
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryforwards 120,200    
Federal tax credit carryforwards that expire beginning in 2023 126,600    
PNM      
Income Taxes, Impairment of Carryforwards      
Federal tax credit carryforwards (427) 427 0
Compensation expense 246 140 84
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 0 427  
Compensation expense 729 483  
TNMP      
Income Taxes, Impairment of Carryforwards      
Federal tax credit carryforwards 0 0 0
Compensation expense 140 59 $ 35
Income Taxes, Reserve Balances      
Federal tax credit carryforwards 0 0  
Compensation expense $ 381 $ 241