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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 2,108,474 $ 1,741,750 $ 1,752,594
Total Other Comprehensive Income (Loss) 7,247 20,194 9,307
Ending Balance 2,222,929 2,108,474 1,741,750
Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 1,863,752 1,512,431 1,461,571
Total Other Comprehensive Income (Loss) 6,575 20,544 11,367
Ending Balance 2,015,264 1,863,752 1,512,431
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (79,183) (99,377) (108,684)
Amounts reclassified from AOCI (pre-tax) (2,320) (2,937) (5,926)
Income tax impact of amounts reclassified 589 746 1,506
Other OCI changes (pre-tax) 12,034 30,006 18,400
Income tax impact of other OCI changes (3,056) (7,621) (4,673)
Total Other Comprehensive Income (Loss) 7,247 20,194 9,307
Ending Balance (71,936) (79,183) (99,377)
Total | Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (78,511) (99,055) (110,422)
Amounts reclassified from AOCI (pre-tax) (1,417) (1,197) (6,659)
Income tax impact of amounts reclassified 360 304 1,692
Other OCI changes (pre-tax) 10,230 28,735 21,895
Income tax impact of other OCI changes (2,598) (7,298) (5,561)
Total Other Comprehensive Income (Loss) 6,575 20,544 11,367
Ending Balance (71,936) (78,511) (99,055)
Unrealized Gains on Available-for-Sale Securities | Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 20,403 10,638 1,939
Amounts reclassified from AOCI (pre-tax) (9,765) (9,497) (14,063)
Income tax impact of amounts reclassified 2,480 2,412 3,572
Other OCI changes (pre-tax) (1,881) 22,586 25,724
Income tax impact of other OCI changes 478 (5,736) (6,534)
Total Other Comprehensive Income (Loss) (8,688) 9,765 8,699
Ending Balance 11,715 20,403 10,638
Pension Liability Adjustment | Public Service Company of New Mexico      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (98,914) (109,693) (112,361)
Amounts reclassified from AOCI (pre-tax) 8,348 8,300 7,404
Income tax impact of amounts reclassified (2,120) (2,108) (1,880)
Other OCI changes (pre-tax) 12,111 6,149 (3,829)
Income tax impact of other OCI changes (3,076) (1,562) 973
Total Other Comprehensive Income (Loss) 15,263 10,779 2,668
Ending Balance (83,651) (98,914) (109,693)
Fair Value Adjustment for Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (672) (322) 1,738
Amounts reclassified from AOCI (pre-tax) (903) (1,740) 733
Income tax impact of amounts reclassified 229 442 (186)
Other OCI changes (pre-tax) 1,804 1,271 (3,495)
Income tax impact of other OCI changes (458) (323) 888
Total Other Comprehensive Income (Loss) 672 (350) (2,060)
Ending Balance $ 0 $ (672) $ (322)