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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 2,108,474 $ 1,741,750
Total Other Comprehensive Income (Loss) (3,159) (4,050)
Ending balance 2,088,226 1,687,569
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (79,183) (99,377)
Amounts reclassified from AOCI (pre-tax) (2,155) 852
Income tax impact of amounts reclassified 547 (216)
Other OCI changes (pre-tax) (2,079) (6,281)
Income tax impact of other OCI changes 528 1,595
Total Other Comprehensive Income (Loss) (3,159) (4,050)
Ending balance (82,342) (103,427)
Fair Value Adjustment for Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (672) (322)
Amounts reclassified from AOCI (pre-tax) (624) (38)
Income tax impact of amounts reclassified 158 10
Other OCI changes (pre-tax) 1,247 (1,998)
Income tax impact of other OCI changes (317) 507
Total Other Comprehensive Income (Loss) 464 (1,519)
Ending balance (208) (1,841)
PNM    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 1,863,752 1,512,431
Total Other Comprehensive Income (Loss) (3,623) (2,531)
Ending balance 1,876,916 1,450,484
PNM | Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (78,511) (99,055)
Amounts reclassified from AOCI (pre-tax) (1,531) 890
Income tax impact of amounts reclassified 389 (226)
Other OCI changes (pre-tax) (3,326) (4,283)
Income tax impact of other OCI changes 845 1,088
Total Other Comprehensive Income (Loss) (3,623) (2,531)
Ending balance (82,134) (101,586)
PNM | Unrealized Gains on Available-for-Sale Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 20,403 10,638
Amounts reclassified from AOCI (pre-tax) (3,618) (1,185)
Income tax impact of amounts reclassified 919 301
Other OCI changes (pre-tax) (3,326) (4,283)
Income tax impact of other OCI changes 845 1,088
Total Other Comprehensive Income (Loss) (5,180) (4,079)
Ending balance 15,223 6,559
PNM | Pension Liability Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (98,914) (109,693)
Amounts reclassified from AOCI (pre-tax) 2,087 2,075
Income tax impact of amounts reclassified (530) (527)
Total Other Comprehensive Income (Loss) 1,557 1,548
Ending balance $ (97,357) $ (108,145)