Consolidated Statements of Comprehensive Income (Loss) - PNMR (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Unrealized holding gains (losses) arising during the period, income tax (expense) benefit	$ 490	$ 478	$ (5,736)
Reclassification adjustment for (gains) losses included in net earnings, income tax expense (benefit)	972	2,480	2,412
Pension liability adjustment, income tax expense (benefit)	1,159	(3,076)	(1,562)
Reclassification adjustment for amortization of experience losses recognized as net periodic benefit cost, income tax expense	(1,804)	(2,120)	(2,108)
Change in fair market value, income tax (expense) benefit	(3,121)	(458)	(323)
Reclassification adjustment for losses included in net earnings, income tax expense (benefit)	$ 299	$ 229	$ 442