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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 1,741,750 $ 1,752,594 $ 1,761,448
Total Other Comprehensive Income (Loss) 20,194 9,307 (1,536)
Ending Balance 2,108,474 1,741,750 1,752,594
Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     0
Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     1,761,448
Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 1,512,431 1,461,571 1,488,369
Total Other Comprehensive Income (Loss) 20,544 11,367 (2,121)
Ending Balance 1,863,752 1,512,431 1,461,571
Public Service Company of New Mexico | Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     1,488,369
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (99,377) (108,684) (95,940)
Amounts reclassified from AOCI (pre-tax) (2,937) (5,926) 3,965
Income tax impact of amounts reclassified 746 1,506 (1,008)
Other OCI changes (pre-tax) 30,006 18,400 (6,022)
Income tax impact of other OCI changes (7,621) (4,673) 1,529
Total Other Comprehensive Income (Loss) 20,194 9,307 (1,536)
Ending Balance (79,183) (99,377) (108,684)
Total | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (11,208)
Total | Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (107,148)
Total | Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (99,055) (110,422) (97,093)
Amounts reclassified from AOCI (pre-tax) (1,197) (6,659) 3,749
Income tax impact of amounts reclassified 304 1,692 (952)
Other OCI changes (pre-tax) 28,735 21,895 (6,592)
Income tax impact of other OCI changes (7,298) (5,561) 1,674
Total Other Comprehensive Income (Loss) 20,544 11,367 (2,121)
Ending Balance (78,511) (99,055) (110,422)
Total | Public Service Company of New Mexico | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (11,208)
Total | Public Service Company of New Mexico | Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (108,301)
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 10,638 1,939 13,169
Amounts reclassified from AOCI (pre-tax) (9,497) (14,063) (3,819)
Income tax impact of amounts reclassified 2,412 3,572 970
Other OCI changes (pre-tax) 22,586 25,724 3,790
Income tax impact of other OCI changes (5,736) (6,534) (963)
Total Other Comprehensive Income (Loss) 9,765 8,699 (22)
Ending Balance 20,403 10,638 1,939
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico | Cumulative Effect, Period of Adoption, Adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (11,208)
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico | Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     1,961
Pension Liability Adjustment | Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (109,693) (112,361) (110,262)
Amounts reclassified from AOCI (pre-tax) 8,300 7,404 7,568
Income tax impact of amounts reclassified (2,108) (1,880) (1,922)
Other OCI changes (pre-tax) 6,149 (3,829) (10,382)
Income tax impact of other OCI changes (1,562) 973 2,637
Total Other Comprehensive Income (Loss) 10,779 2,668 (2,099)
Ending Balance (98,914) (109,693) (112,361)
Pension Liability Adjustment | Public Service Company of New Mexico | Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     (110,262)
Fair Value Adjustment for Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     1,153
Amounts reclassified from AOCI (pre-tax)     216
Income tax impact of amounts reclassified     (56)
Other OCI changes (pre-tax)     570
Income tax impact of other OCI changes     (145)
Total Other Comprehensive Income (Loss)     585
Fair Value Adjustment for Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjusted Balance      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance     1,153
Fair Value Adjustment for Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (322) 1,738  
Amounts reclassified from AOCI (pre-tax) (1,740) 733  
Income tax impact of amounts reclassified 442 (186)  
Other OCI changes (pre-tax) 1,271 (3,495)  
Income tax impact of other OCI changes (323) 888  
Total Other Comprehensive Income (Loss) (350) (2,060)  
Ending Balance $ (672) $ (322) $ 1,738