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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
PNM | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 4,215 4,036 12,643 12,107
Expected return on plan assets (7,140) (7,133) (21,422) (21,398)
Amortization of net loss 3,948 4,541 11,846 13,624
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 1,023 1,444 3,067 4,333
PNM | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 2 5 6 18
Interest cost 479 476 1,437 1,430
Expected return on plan assets (1,088) (1,042) (3,264) (3,125)
Amortization of net loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (607) (561) (1,821) (1,677)
PNM | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 90 90 270 271
Expected return on plan assets 0 0 0 0
Amortization of net loss 81 99 245 296
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 171 189 515 567
Texas-New Mexico Power Company | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 430 435 1,290 1,306
Expected return on plan assets (618) (795) (1,854) (2,386)
Amortization of net loss 233 311 699 935
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 45 (49) 135 (145)
Texas-New Mexico Power Company | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 9 12 27 34
Interest cost 77 77 231 231
Expected return on plan assets (104) (101) (312) (304)
Amortization of net loss (130) (81) (390) (242)
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (148) (93) (444) (281)
Texas-New Mexico Power Company | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 2 4 8 13
Expected return on plan assets 0 0 0 0
Amortization of net loss 0 8 0 25
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) $ 2 $ 12 $ 8 $ 38