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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the nine months ended September 30, 2016 and 2015 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, 2015
$
17,346

 
$
(88,822
)
 
$
(71,476
)
 
$
44

 
$
(71,432
)
Amounts reclassified from AOCI (pre-tax)
(10,135
)
 
4,128

 
(6,007
)
 
573

 
(5,434
)
Income tax impact of amounts reclassified
3,955

 
(1,611
)
 
2,344

 
(224
)
 
2,120

 Other OCI changes (pre-tax)
3,115

 
—

 
3,115

 
(1,305
)
 
1,810

Income tax impact of other OCI changes
(1,216
)
 
—

 
(1,216
)
 
509

 
(707
)
Net change after income taxes
(4,281
)
 
2,517

 
(1,764
)
 
(447
)
 
(2,211
)
Balance at September 30, 2016
$
13,065

 
$
(86,305
)
 
$
(73,240
)
 
$
(403
)
 
$
(73,643
)
 
 
Balance at December 31, 2014
$
28,008

 
$
(89,763
)
 
$
(61,755
)
 
$
—

 
$
(61,755
)
 Amounts reclassified from AOCI (pre-tax)
(22,552
)
 
4,464

 
(18,088
)
 
—

 
(18,088
)
Income tax impact of amounts reclassified
8,838

 
(1,749
)
 
7,089

 
—

 
7,089

 Other OCI changes (pre-tax)
3,095

 
—

 
3,095

 
(704
)
 
2,391

Income tax impact of other OCI changes
(1,213
)
 
—

 
(1,213
)
 
276

 
(937
)
Net change after income taxes
(11,832
)
 
2,715

 
(9,117
)
 
(428
)
 
(9,545
)
Balance at September 30, 2015
$
16,176

 
$
(87,048
)
 
$
(70,872
)
 
$
(428
)
 
$
(71,300
)