Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2018 and 2017 is as follows:

	Accumulated Other Comprehensive Income (Loss)
	PNM									PNMR
	Unrealized									Fair Value
	Gains on									Adjustment
	Available-for-			Pension						for Cash
	Sale			Liability						Flow
	Securities			Adjustment			Total			Hedges			Total
	(In thousands)
Balance at December 31, 2017, as originally reported	$	13,169		$	(110,262	)	$	(97,093	)	$	1,153		$	(95,940	)
Cumulative effect adjustment (Note 7)	(11,208		)	—			(11,208		)	—			(11,208		)
Balance at January 1, 2018, as adjusted	1,961			(110,262		)	(108,301		)	1,153			(107,148		)
Amounts reclassified from AOCI (pre-tax)	(2,629		)	1,891			(738		)	(53		)	(791		)
Income tax impact of amounts reclassified	668			(480		)	188			13			201
Other OCI changes (pre-tax)	1,115			—			1,115			1,858			2,973
Income tax impact of other OCI changes	(283		)	—			(283		)	(472		)	(755		)
Net after-tax change	(1,129		)	1,411			282			1,346			1,628
Balance at March 31, 2018	$	832		$	(108,851	)	$	(108,019	)	$	2,499		$	(105,520	)

Balance at December 31, 2016	$	4,320		$	(96,748	)	$	(92,428	)	$	(23	)	$	(92,451	)
Amounts reclassified from AOCI (pre-tax)	(2,763		)	1,618			(1,145		)	112			(1,033		)
Income tax impact of amounts reclassified	1,078			(631		)	447			(44		)	403
Other OCI changes (pre-tax)	7,766			—			7,766			(185		)	7,581
Income tax impact of other OCI changes	(3,030		)	—			(3,030		)	72			(2,958		)
Net after-tax change	3,051			987			4,038			(45		)	3,993
Balance at March 31, 2017	$	7,371		$	(95,761	)	$	(88,390	)	$	(68	)	$	(88,458	)