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Fair Value of Derivative and Other Financial Instruments - Investments in NDT and Gross Realized Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity securities:
Net gains from equity securities sold	$ 4,218	$ 5,356	$ 6,240	$ 4,041
Net gains (losses) from equity securities still held	8,707	13,377	5,541	(5,554)
Total net gains (losses) on equity securities	12,925	18,733	11,781	(1,513)
Available-for-sale debt securities:
Net gains (losses) on debt securities	267	2,887	2,379	(9,716)
Net gains (losses) on investment securities	13,192	21,620	14,160	(11,229)
PNM
Available-for-sale debt securities:
Proceeds from sales	239,696	205,296	363,291	354,651
Gross realized gains	10,611	11,262	19,304	17,087
Gross realized (losses)	$ (7,805)	$ (7,002)	$ (11,249)	$ (14,037)

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