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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the six months ended June 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)
(5,049
)
 
2,752

 
(2,297
)
 
371

 
(1,926
)
Income tax impact of amounts reclassified
1,970

 
(1,074
)
 
896

 
(145
)
 
751

 Other OCI changes (pre-tax)
(1,695
)
 
—

 
(1,695
)
 
(1,746
)
 
(3,441
)
Income tax impact of other OCI changes
661

 
—

 
661

 
681

 
1,342

Net change after income taxes
(4,113
)
 
1,678

 
(2,435
)
 
(839
)
 
(3,274
)
Balance at June 30, 2016
$
13,233

 
$
(87,144
)
 
$
(73,911
)
 
$
(795
)
 
$
(74,706
)
Balance at December 31, 2014
$
28,008

 
$
(89,763
)
 
$
(61,755
)
 
$
—

 
$
(61,755
)
 Amounts reclassified from AOCI (pre-tax)
(12,537
)
 
2,976

 
(9,561
)
 
—

 
(9,561
)
Income tax impact of amounts reclassified
4,913

 
(1,166
)
 
3,747

 
—

 
3,747

 Other OCI changes (pre-tax)
6,157

 
—

 
6,157

 
—

 
6,157

Income tax impact of other OCI changes
(2,413
)
 
—

 
(2,413
)
 
—

 
(2,413
)
Net change after income taxes
(3,880
)
 
1,810

 
(2,070
)
 
—

 
(2,070
)
Balance at June 30, 2015
$
24,128

 
$
(87,953
)
 
$
(63,825
)
 
$
—

 
$
(63,825
)