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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
PNM | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 5,914 4,214 11,827 8,428
Expected return on plan assets (7,299) (7,141) (14,598) (14,282)
Amortization of net loss 2,645 3,949 5,291 7,898
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 1,260 1,022 2,520 2,044
PNM | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 2 0 4
Interest cost 676 479 1,352 958
Expected return on plan assets (1,243) (1,088) (2,485) (2,176)
Amortization of net loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (567) (607) (1,133) (1,214)
PNM | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 135 90 270 180
Expected return on plan assets 0 0 0 0
Amortization of net loss 38 82 76 164
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 173 172 346 344
Texas-New Mexico Power Company | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 600 430 1,201 860
Expected return on plan assets (675) (618) (1,349) (1,236)
Amortization of net loss 109 233 219 466
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 34 45 71 90
Texas-New Mexico Power Company | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 6 9 11 18
Interest cost 107 77 213 154
Expected return on plan assets (121) (104) (241) (208)
Amortization of net loss (190) (130) (380) (260)
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (198) (148) (397) (296)
Texas-New Mexico Power Company | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 3 3 6 6
Expected return on plan assets 0 0 0 0
Amortization of net loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) $ 3 $ 3 $ 6 $ 6