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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 2,264,802 $ 2,169,800 $ 2,244,926 $ 2,222,929
Total Other Comprehensive Income (Loss) 5,119 (245) 6,813 (4,889)
Ending balance 2,313,596 2,185,687 2,313,596 2,185,687
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (64,354) (76,580) (66,048) (71,936)
Amounts reclassified from AOCI (pre-tax)     1,005 (550)
Income tax impact of amounts reclassified     (255) 140
Other OCI changes (pre-tax)     8,127 (6,004)
Income tax impact of other OCI changes     (2,064) 1,525
Total Other Comprehensive Income (Loss) 5,119 (245) 6,813 (4,889)
Ending balance (59,235) (76,825) (59,235) (76,825)
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)     1,197 (1,185)
Income tax impact of amounts reclassified     (304) 301
Other OCI changes (pre-tax)     3,567 3,448
Income tax impact of other OCI changes     (906) (876)
Total Other Comprehensive Income (Loss)     3,554 1,688
Ending balance 11,841 1,688 11,841 1,688
PNM        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 2,017,995 2,013,794 1,960,324 2,015,264
Total Other Comprehensive Income (Loss) (219) (1,933) 3,259 (6,577)
Ending balance 2,047,702 2,005,541 2,047,702 2,005,541
PNM | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (70,857) (76,580) (74,335) (71,936)
Amounts reclassified from AOCI (pre-tax)     (192) 635
Income tax impact of amounts reclassified     49 (161)
Other OCI changes (pre-tax)     4,560 (9,452)
Income tax impact of other OCI changes     (1,158) 2,401
Total Other Comprehensive Income (Loss) (219) (1,933) 3,259 (6,577)
Ending balance (71,076) (78,513) (71,076) (78,513)
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)     (2,580) (2,917)
Income tax impact of amounts reclassified     655 741
Other OCI changes (pre-tax)     4,560 (9,452)
Income tax impact of other OCI changes     (1,158) 2,401
Total Other Comprehensive Income (Loss)     1,477 (9,227)
Ending balance 8,899 2,488 8,899 2,488
PNM | Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (81,757) (83,651)
Amounts reclassified from AOCI (pre-tax)     2,388 3,552
Income tax impact of amounts reclassified     (606) (902)
Other OCI changes (pre-tax)     0 0
Income tax impact of other OCI changes     0 0
Total Other Comprehensive Income (Loss)     1,782 2,650
Ending balance $ (79,975) $ (81,001) $ (79,975) $ (81,001)