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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 2,404,730 $ 2,264,802 $ 2,399,051 $ 2,244,926
Total Other Comprehensive Income (Loss) (2,292) 5,119 (7,060) 6,813
Ending balance 2,451,680 2,313,596 2,451,680 2,313,596
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (67,608) (64,354) (62,840) (66,048)
Amounts reclassified from AOCI (pre-tax)     (4,570) 1,005
Income tax impact of amounts reclassified     1,161 (255)
Other OCI changes (pre-tax)     (4,894) 8,127
Income tax impact of other OCI changes     1,243 (2,064)
Total Other Comprehensive Income (Loss) (2,292) 5,119 (7,060) 6,813
Ending balance (69,900) (59,235) (69,900) (59,235)
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)     5,563 1,197
Income tax impact of amounts reclassified     (1,413) (304)
Other OCI changes (pre-tax)     (4,307) 3,567
Income tax impact of other OCI changes     1,094 (906)
Total Other Comprehensive Income (Loss)     937 3,554
Ending balance 4,602 11,841 4,602 11,841
PNM        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 2,034,870 2,017,995 2,000,775 1,960,324
Total Other Comprehensive Income (Loss) (1,131) (219) (7,997) 3,259
Ending balance 2,119,459 2,047,702 2,119,459 2,047,702
PNM | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (73,371) (70,857) (66,505) (74,335)
Amounts reclassified from AOCI (pre-tax)     (10,133) (192)
Income tax impact of amounts reclassified     2,574 49
Other OCI changes (pre-tax)     (587) 4,560
Income tax impact of other OCI changes     149 (1,158)
Total Other Comprehensive Income (Loss) (1,131) (219) (7,997) 3,259
Ending balance (74,502) (71,076) (74,502) (71,076)
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)     (12,566) (2,580)
Income tax impact of amounts reclassified     3,192 655
Other OCI changes (pre-tax)     (587) 4,560
Income tax impact of other OCI changes     149 (1,158)
Total Other Comprehensive Income (Loss)     (9,812) 1,477
Ending balance 840 8,899 840 8,899
PNM | Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (77,157) (81,757)
Amounts reclassified from AOCI (pre-tax)     2,433 2,388
Income tax impact of amounts reclassified     (618) (606)
Other OCI changes (pre-tax)     0 0
Income tax impact of other OCI changes     0 0
Total Other Comprehensive Income (Loss)     1,815 1,782
Ending balance $ (75,342) $ (79,975) $ (75,342) $ (79,975)