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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 2,451,680 $ 2,313,596 $ 2,399,051 $ 2,244,926
Total Other Comprehensive Income (Loss) (3,499) (3,185) (10,559) 3,628
Ending balance 2,508,048 2,286,384 2,508,048 2,286,384
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (69,900) (59,235) (62,840) (66,048)
Amounts reclassified from AOCI (pre-tax)     (827) 4,757
Income tax impact of amounts reclassified     210 (1,208)
Other OCI changes (pre-tax)     (13,327) 105
Income tax impact of other OCI changes     3,385 (26)
Total Other Comprehensive Income (Loss) (3,499) (3,185) (10,559) 3,628
Ending balance (73,399) (62,420) (73,399) (62,420)
Fair Value Adjustment for Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     3,665 8,287
Amounts reclassified from AOCI (pre-tax)     8,456 5,286
Income tax impact of amounts reclassified     (2,148) (1,343)
Other OCI changes (pre-tax)     (13,689) (2,386)
Income tax impact of other OCI changes     3,477 606
Total Other Comprehensive Income (Loss)     (3,904) 2,163
Ending balance (239) 10,450 (239) 10,450
PNM        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 2,119,459 2,047,702 2,000,775 1,960,324
Total Other Comprehensive Income (Loss) 1,342 (1,794) (6,655) 1,465
Ending balance 2,228,604 2,053,804 2,228,604 2,053,804
PNM | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (74,502) (71,076) (66,505) (74,335)
Amounts reclassified from AOCI (pre-tax)     (9,283) (529)
Income tax impact of amounts reclassified     2,358 135
Other OCI changes (pre-tax)     362 2,491
Income tax impact of other OCI changes     (92) (632)
Total Other Comprehensive Income (Loss) 1,342 (1,794) (6,655) 1,465
Ending balance (73,160) (72,870) (73,160) (72,870)
PNM | Unrealized Gains on Available-for-Sale Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     10,652 7,422
Amounts reclassified from AOCI (pre-tax)     (12,932) (4,111)
Income tax impact of amounts reclassified     3,285 1,044
Other OCI changes (pre-tax)     362 2,491
Income tax impact of other OCI changes     (92) (632)
Total Other Comprehensive Income (Loss)     (9,377) (1,208)
Ending balance 1,275 6,214 1,275 6,214
PNM | Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (77,157) (81,757)
Amounts reclassified from AOCI (pre-tax)     3,649 3,582
Income tax impact of amounts reclassified     (927) (909)
Other OCI changes (pre-tax)     0 0
Income tax impact of other OCI changes     0 0
Total Other Comprehensive Income (Loss)     2,722 2,673
Ending balance $ (74,435) $ (79,084) $ (74,435) $ (79,084)