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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 2,244,926 $ 2,222,929
Total Other Comprehensive Income (Loss) 1,694 (4,644)
Ending balance 2,264,802 2,169,800
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (66,048) (71,936)
Amounts reclassified from AOCI (pre-tax) (1,732) 299
Income tax impact of amounts reclassified 440 (76)
Other OCI changes (pre-tax) 4,002 (6,524)
Income tax impact of other OCI changes (1,016) 1,657
Total Other Comprehensive Income (Loss) 1,694 (4,644)
Ending balance (64,354) (76,580)
Fair Value Adjustment for Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 8,287 0
Amounts reclassified from AOCI (pre-tax) (2,224) 0
Income tax impact of amounts reclassified 565 0
Other OCI changes (pre-tax) (168) 0
Income tax impact of other OCI changes 43 0
Total Other Comprehensive Income (Loss) (1,784) 0
Ending balance 6,503 0
PNM    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 1,960,324 2,015,264
Total Other Comprehensive Income (Loss) 3,478 (4,644)
Ending balance 2,017,995 2,013,794
PNM | Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (74,335) (71,936)
Amounts reclassified from AOCI (pre-tax) 492 299
Income tax impact of amounts reclassified (125) (76)
Other OCI changes (pre-tax) 4,170 (6,524)
Income tax impact of other OCI changes (1,059) 1,657
Total Other Comprehensive Income (Loss) 3,478 (4,644)
Ending balance (70,857) (76,580)
PNM | Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 7,422 11,715
Amounts reclassified from AOCI (pre-tax) (702) (1,477)
Income tax impact of amounts reclassified 178 375
Other OCI changes (pre-tax) 4,170 (6,524)
Income tax impact of other OCI changes (1,059) 1,657
Total Other Comprehensive Income (Loss) 2,587 (5,969)
Ending balance 10,009 5,746
PNM | Pension Liability Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (81,757) (83,651)
Amounts reclassified from AOCI (pre-tax) 1,194 1,776
Income tax impact of amounts reclassified (303) (451)
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 891 1,325
Ending balance $ (80,866) $ (82,326)