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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 2,583,285 $ 2,399,051
Total Other Comprehensive Income (Loss) 1,122 (4,768)
Ending balance 2,550,707 2,404,730
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (75,708) (62,840)
Amounts reclassified from AOCI (pre-tax) 1,237 (6,949)
Income tax impact of amounts reclassified (314) 1,765
Other OCI changes (pre-tax) 267 558
Income tax impact of other OCI changes (68) (142)
Total Other Comprehensive Income (Loss) 1,122 (4,768)
Ending balance (74,586) (67,608)
Fair Value Adjustment for Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 0 3,665
Amounts reclassified from AOCI (pre-tax) 0 2,745
Income tax impact of amounts reclassified 0 (697)
Other OCI changes (pre-tax) 0 67
Income tax impact of other OCI changes 0 (17)
Total Other Comprehensive Income (Loss) 0 2,098
Ending balance 0 5,763
PNM    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 2,184,198 2,000,775
Total Other Comprehensive Income (Loss) 1,122 (6,866)
Ending balance 2,185,737 2,034,870
PNM | Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (75,708) (66,505)
Amounts reclassified from AOCI (pre-tax) 1,237 (9,694)
Income tax impact of amounts reclassified (314) 2,462
Other OCI changes (pre-tax) 267 491
Income tax impact of other OCI changes (68) (125)
Total Other Comprehensive Income (Loss) 1,122 (6,866)
Ending balance (74,586) (73,371)
PNM | Unrealized Gains on Available-for-Sale Debt Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 214 10,652
Amounts reclassified from AOCI (pre-tax) (137) (10,910)
Income tax impact of amounts reclassified 35 2,771
Other OCI changes (pre-tax) 267 491
Income tax impact of other OCI changes (68) (125)
Total Other Comprehensive Income (Loss) 97 (7,773)
Ending balance 311 2,879
PNM | Pension Liability Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (75,922) (77,157)
Amounts reclassified from AOCI (pre-tax) 1,374 1,216
Income tax impact of amounts reclassified (349) (309)
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 1,025 907
Ending balance $ (74,897) $ (76,250)