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Fair Value of Derivative and Other Financial Instruments - Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale debt securities, Within 1 year	$ 5,108us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 1 year through 5 years	17,210us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 5 years through 10 years	14,006us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 10 years through 15 years	10,705pnm_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsThroughFifteenYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 15 years through 20 years	12,048pnm_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenYearsThroughTwentyYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 20 years	51,625pnm_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities	110,702us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity debt securities, Due within 1 year	17,173us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held-to-maturity debt securities, After 1 year through 5 years	626us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held-to-maturity debt securities, After 5 years through 10 years	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held-to-maturity debt securities	17,799us-gaap_HeldToMaturitySecuritiesFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Public Service Company of New Mexico [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity debt securities, Due within 1 year	17,173us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held-to-maturity debt securities, After 1 year through 5 years	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held-to-maturity debt securities, After 5 years through 10 years	0us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held-to-maturity debt securities	$ 17,173us-gaap_HeldToMaturitySecuritiesFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember

X

- Definition

Available-for-sale Securities, Debt Maturities, after Fifteen Years Through Twenty Years, Fair Value

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Available-for-sale Securities, Debt Maturities, after Ten Years Through Fifteen Years, Fair Value

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- Definition

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- Definition

Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 320

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

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+ References

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+ References

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

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