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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 2,313,596 $ 2,185,687 $ 2,244,926 $ 2,222,929
Total Other Comprehensive Income (Loss) (3,185) 6,646 3,628 1,757
Ending balance 2,286,384 2,255,728 2,286,384 2,255,728
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (59,235) (76,825) (66,048) (71,936)
Amounts reclassified from AOCI (pre-tax)     4,757 135
Income tax impact of amounts reclassified     (1,208) (34)
Other OCI changes (pre-tax)     105 2,221
Income tax impact of other OCI changes     (26) (565)
Total Other Comprehensive Income (Loss) (3,185) 6,646 3,628 1,757
Ending balance (62,420) (70,179) (62,420) (70,179)
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)     5,286 (1,767)
Income tax impact of amounts reclassified     (1,343) 449
Other OCI changes (pre-tax)     (2,386) 10,391
Income tax impact of other OCI changes     606 (2,640)
Total Other Comprehensive Income (Loss)     2,163 6,433
Ending balance 10,450 6,433 10,450 6,433
PNM        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 2,047,702 2,005,541 1,960,324 2,015,264
Total Other Comprehensive Income (Loss) (1,794) 1,901 1,465 (4,676)
Ending balance 2,053,804 2,019,592 2,053,804 2,019,592
PNM | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (71,076) (78,513) (74,335) (71,936)
Amounts reclassified from AOCI (pre-tax)     (529) 1,902
Income tax impact of amounts reclassified     135 (483)
Other OCI changes (pre-tax)     2,491 (8,170)
Income tax impact of other OCI changes     (632) 2,075
Total Other Comprehensive Income (Loss) (1,794) 1,901 1,465 (4,676)
Ending balance (72,870) (76,612) (72,870) (76,612)
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)     (4,111) (3,426)
Income tax impact of amounts reclassified     1,044 870
Other OCI changes (pre-tax)     2,491 (8,170)
Income tax impact of other OCI changes     (632) 2,075
Total Other Comprehensive Income (Loss)     (1,208) (8,651)
Ending balance 6,214 3,064 6,214 3,064
PNM | Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (81,757) (83,651)
Amounts reclassified from AOCI (pre-tax)     3,582 5,328
Income tax impact of amounts reclassified     (909) (1,353)
Other OCI changes (pre-tax)     0 0
Income tax impact of other OCI changes     0 0
Total Other Comprehensive Income (Loss)     2,673 3,975
Ending balance $ (79,084) $ (79,676) $ (79,084) $ (79,676)