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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 2,222,929 $ 2,108,474
Total Other Comprehensive Income (Loss) (4,644) (3,159)
Ending balance 2,169,800 2,088,226
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (71,936) (79,183)
Amounts reclassified from AOCI (pre-tax) 299 (2,155)
Income tax impact of amounts reclassified (76) 547
Other OCI changes (pre-tax) (6,524) (2,079)
Income tax impact of other OCI changes 1,657 528
Total Other Comprehensive Income (Loss) (4,644) (3,159)
Ending balance (76,580) (82,342)
Fair Value Adjustment for Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 0 (672)
Amounts reclassified from AOCI (pre-tax) 0 (624)
Income tax impact of amounts reclassified 0 158
Other OCI changes (pre-tax) 0 1,247
Income tax impact of other OCI changes 0 (317)
Total Other Comprehensive Income (Loss) 0 464
Ending balance 0 (208)
PNM    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 2,015,264 1,863,752
Total Other Comprehensive Income (Loss) (4,644) (3,623)
Ending balance 2,013,794 1,876,916
PNM | Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (71,936) (78,511)
Amounts reclassified from AOCI (pre-tax) 299 (1,531)
Income tax impact of amounts reclassified (76) 389
Other OCI changes (pre-tax) (6,524) (3,326)
Income tax impact of other OCI changes 1,657 845
Total Other Comprehensive Income (Loss) (4,644) (3,623)
Ending balance (76,580) (82,134)
PNM | Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 11,715 20,403
Amounts reclassified from AOCI (pre-tax) (1,477) (3,618)
Income tax impact of amounts reclassified 375 919
Other OCI changes (pre-tax) (6,524) (3,326)
Income tax impact of other OCI changes 1,657 845
Total Other Comprehensive Income (Loss) (5,969) (5,180)
Ending balance 5,746 15,223
PNM | Pension Liability Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (83,651) (98,914)
Amounts reclassified from AOCI (pre-tax) 1,776 2,087
Income tax impact of amounts reclassified (451) (530)
Other OCI changes (pre-tax) 0 0
Income tax impact of other OCI changes 0 0
Total Other Comprehensive Income (Loss) 1,325 1,557
Ending balance $ (82,326) $ (97,357)