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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 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)
(11,210
)
 
1,376

 
(9,834
)
 
146

 
(9,688
)
Income tax impact of amounts reclassified
4,374

 
(537
)
 
3,837

 
(57
)
 
3,780

 Other OCI changes (pre-tax)
5,458

 
—

 
5,458

 
(1,289
)
 
4,169

Income tax impact of other OCI changes
(2,130
)
 
—

 
(2,130
)
 
503

 
(1,627
)
Net change after income taxes
(3,508
)
 
839

 
(2,669
)
 
(697
)
 
(3,366
)
Balance at March 31, 2016
$
13,838

 
$
(87,983
)
 
$
(74,145
)
 
$
(653
)
 
$
(74,798
)
Balance at December 31, 2014
$
28,008

 
$
(89,763
)
 
$
(61,755
)
 
$
—

 
$
(61,755
)
 Amounts reclassified from AOCI (pre-tax)
(4,172
)
 
1,488

 
(2,684
)
 
—

 
(2,684
)
Income tax impact of amounts reclassified
1,635

 
(583
)
 
1,052

 
—

 
1,052

 Other OCI changes (pre-tax)
6,836

 
—

 
6,836

 
—

 
6,836

Income tax impact of other OCI changes
(2,679
)
 
—

 
(2,679
)
 
—

 
(2,679
)
Net change after income taxes
1,620

 
905

 
2,525

 
—

 
2,525

Balance at March 31, 2015
$
29,628

 
$
(88,858
)
 
$
(59,230
)
 
$
—

 
$
(59,230
)