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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,088,226	$ 1,687,569	$ 2,108,474	$ 1,741,750
Total Other Comprehensive Income (Loss)	2,989	10,846	(170)	6,796
Ending balance	2,145,398	1,756,427	2,145,398	1,756,427
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(82,342)	(103,427)	(79,183)	(99,377)
Amounts reclassified from AOCI (pre-tax)			(2,361)	591
Income tax impact of amounts reclassified			599	(150)
Other OCI changes (pre-tax)			2,133	8,519
Income tax impact of other OCI changes			(541)	(2,164)
Total Other Comprehensive Income (Loss)	2,989	10,846	(170)	6,796
Ending balance	(79,353)	(92,581)	(79,353)	(92,581)
Fair Value Adjustment for Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(672)	(322)
Amounts reclassified from AOCI (pre-tax)			(903)	(500)
Income tax impact of amounts reclassified			229	127
Other OCI changes (pre-tax)			1,804	(1,198)
Income tax impact of other OCI changes			(458)	304
Total Other Comprehensive Income (Loss)			672	(1,267)
Ending balance	0	(1,589)	0	(1,589)
PNM
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,876,916	1,450,484	1,863,752	1,512,431
Total Other Comprehensive Income (Loss)	2,781	10,594	(842)	8,063
Ending balance	1,920,956	1,506,198	1,920,956	1,506,198
PNM | Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(82,134)	(101,586)	(78,511)	(99,055)
Amounts reclassified from AOCI (pre-tax)			(1,458)	1,091
Income tax impact of amounts reclassified			370	(277)
Other OCI changes (pre-tax)			329	9,717
Income tax impact of other OCI changes			(83)	(2,468)
Total Other Comprehensive Income (Loss)	2,781	10,594	(842)	8,063
Ending balance	(79,353)	(90,992)	(79,353)	(90,992)
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)			(5,632)	(3,059)
Income tax impact of amounts reclassified			1,430	777
Other OCI changes (pre-tax)			329	9,717
Income tax impact of other OCI changes			(83)	(2,468)
Total Other Comprehensive Income (Loss)			(3,956)	4,967
Ending balance	16,447	15,605	16,447	15,605
PNM | Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(98,914)	(109,693)
Amounts reclassified from AOCI (pre-tax)			4,174	4,150
Income tax impact of amounts reclassified			(1,060)	(1,054)
Other OCI changes (pre-tax)			0	0
Income tax impact of other OCI changes			0	0
Total Other Comprehensive Income (Loss)			3,114	3,096
Ending balance	$ (95,800)	$ (106,597)	$ (95,800)	$ (106,597)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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