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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
PNM | Pension Plan    
Components of Net Periodic Benefit Cost    
Service cost $ 0 $ 0
Interest cost 5,913 4,214
Expected return on plan assets (7,299) (7,141)
Amortization of net loss 2,646 3,949
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 1,260 1,022
PNM | OPEB Plan    
Components of Net Periodic Benefit Cost    
Service cost 0 2
Interest cost 676 479
Expected return on plan assets (1,243) (1,088)
Amortization of net loss 0 0
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) (567) (607)
PNM | Executive Retirement Program    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 135 90
Expected return on plan assets 0 0
Amortization of net loss 38 82
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 173 172
Texas-New Mexico Power Company | Pension Plan    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 601 430
Expected return on plan assets (674) (618)
Amortization of net loss 110 233
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 37 45
Texas-New Mexico Power Company | OPEB Plan    
Components of Net Periodic Benefit Cost    
Service cost 5 9
Interest cost 106 77
Expected return on plan assets (120) (104)
Amortization of net loss (190) (130)
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) (199) (148)
Texas-New Mexico Power Company | Executive Retirement Program    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 3 3
Expected return on plan assets 0 0
Amortization of net loss 0 0
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) $ 3 $ 3