Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unrealized holding gains (losses) arising during the period, income tax (expense)	$ (137)	$ (4,143)	$ (3,946)	$ (7,544)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense	1,059	925	4,547	3,639
Pension liability adjustment, income tax (expense) benefit	(508)	(631)	(1,524)	(1,893)
Change in fair market value, income tax (expense)	0	128	53	127
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit)	3	(19)	(58)	(54)
Tnmp Electric [Member]
Change in fair market value, income tax (expense)	0	128	53	127
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit)	3	(19)	(58)	(54)
Pnm Electric [Member]
Unrealized holding gains (losses) arising during the period, income tax (expense)	(137)	(4,143)	(3,946)	(7,544)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense	1,059	925	4,547	3,639
Pension liability adjustment, income tax (expense) benefit	$ (508)	$ (631)	$ (1,524)	$ (1,893)