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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,761,448
Cumulative effect adjustment (Note 7)			$ (11,208)
Balance, as adjusted			1,761,448
Amounts reclassified from AOCI (pre-tax)	(791)	$ (1,033)
Income tax impact of amounts reclassified	201	403
Other OCI changes (pre-tax)	2,973	7,581
Income tax impact of other OCI changes	(755)	(2,958)
Total Other Comprehensive Income	1,628	3,993
Ending balance	1,749,014	(88,458)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(95,940)	(92,451)
Balance, as adjusted			(107,148)
Ending balance	(105,520)
Fair Value Adjustment for Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,153	(23)
Cumulative effect adjustment (Note 7)			0
Balance, as adjusted			1,153
Amounts reclassified from AOCI (pre-tax)	(53)	112
Income tax impact of amounts reclassified	13	(44)
Other OCI changes (pre-tax)	1,858	(185)
Income tax impact of other OCI changes	(472)	72
Total Other Comprehensive Income	1,346	(45)
Ending balance	2,499	(68)
PNM
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1,488,369
Cumulative effect adjustment (Note 7)			(11,208)
Balance, as adjusted			1,488,369
Amounts reclassified from AOCI (pre-tax)	(738)	(1,145)
Income tax impact of amounts reclassified	188	447
Other OCI changes (pre-tax)	1,115	7,766
Income tax impact of other OCI changes	(283)	(3,030)
Total Other Comprehensive Income	282	4,038
Ending balance	1,495,561
PNM | Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(97,093)	(92,428)
Balance, as adjusted			(108,301)
Ending balance	(108,019)	(88,390)
PNM | Unrealized Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	13,169	4,320
Cumulative effect adjustment (Note 7)			(11,208)
Balance, as adjusted			1,961
Amounts reclassified from AOCI (pre-tax)	(2,629)	(2,763)
Income tax impact of amounts reclassified	668	1,078
Other OCI changes (pre-tax)	1,115	7,766
Income tax impact of other OCI changes	(283)	(3,030)
Total Other Comprehensive Income	(1,129)	3,051
Ending balance	832	7,371
PNM | Pension Liability Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(110,262)	(96,748)
Cumulative effect adjustment (Note 7)			0
Balance, as adjusted			$ (110,262)
Amounts reclassified from AOCI (pre-tax)	1,891	1,618
Income tax impact of amounts reclassified	(480)	(631)
Total Other Comprehensive Income	1,411	987
Ending balance	$ (108,851)	$ (95,761)

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

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