Condensed Consolidated Statements of Comprehensive Income - PNMR - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Earnings	$ 19,218	$ 21,205
Unrealized Gains on Available-for-Sale Debt Securities:
Net change in unrealized holding (losses) arising during the period, net of income tax benefit of $1,657 and $845	(4,867)	(2,481)
Reclassification adjustment for (gains) included in net earnings, net of income tax expense of $375 and $919	(1,102)	(2,699)
Pension Liability Adjustment:
Reclassification adjustment for amortization of experience losses recognized as net periodic benefit cost, net of income tax (benefit) of $(451) and $(530)	1,325	1,557
Fair Value Adjustment for Cash Flow Hedges:
Change in fair market value, net of income tax (expense) of $0 and $(317)	0	930
Reclassification adjustment for (gains) included in net earnings, net of income tax expense of $0 and $158	0	(466)
Total Other Comprehensive Income (Loss)	(4,644)	(3,159)
Comprehensive Income	14,574	18,046
Comprehensive (Income) Attributable to Valencia Non-controlling Interest	(3,095)	(3,494)
Preferred Stock Dividend Requirements of Subsidiary	(132)	(132)
Comprehensive Income (Loss) Attributable to PNM	$ 11,347	$ 14,420