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Fair Value of Derivative and Other Financial Instruments, Debt Maturities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
PNMR and PNM [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale debt securities, Within 1 year	$ 3,946us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 1 year through 5 years	20,275us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 5 years through 10 years	13,422us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 10 years through 15 years	10,367pnm_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsThroughFifteenYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 15 years through 20 years	11,539pnm_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenYearsThroughTwentyYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities, After 20 years	46,328pnm_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
Available-for-sale debt securities	105,877us-gaap_AvailableForSaleSecuritiesDebtSecurities / dei_LegalEntityAxis = pnm_PnmrAndPnmMember
PNM Resources [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity debt securities, Due within 1 year	8,019us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held-to-maturity debt securities, After 1 year through 5 years	25,430us-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 Securities, Debt Maturities, after Ten Years Through Fifteen Years, Fair Value	0pnm_HeldtoMaturitySecuritiesDebtMaturitiesafterTenYearsThroughFifteenYearsFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held to Maturity Securities, Debt Maturities, after Fifteen Years Through Twenty Years, Fair Value	0pnm_HeldtoMaturitySecuritiesDebtMaturitiesafterFifteenYearsThroughTwentyYearsFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held to Maturity Securities, Debt Maturities, after Twenty Years, Fair Value	0pnm_HeldtoMaturitySecuritiesDebtMaturitiesafterTwentyYearsFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Held-to-maturity debt securities	33,449us-gaap_HeldToMaturitySecuritiesFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Public Service Company of New Mexico [Member]
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity debt securities, Due within 1 year	8,019us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held-to-maturity debt securities, After 1 year through 5 years	24,817us-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 Securities, Debt Maturities, after Ten Years Through Fifteen Years, Fair Value	0pnm_HeldtoMaturitySecuritiesDebtMaturitiesafterTenYearsThroughFifteenYearsFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held to Maturity Securities, Debt Maturities, after Fifteen Years Through Twenty Years, Fair Value	0pnm_HeldtoMaturitySecuritiesDebtMaturitiesafterFifteenYearsThroughTwentyYearsFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held to Maturity Securities, Debt Maturities, after Twenty Years, Fair Value	0pnm_HeldtoMaturitySecuritiesDebtMaturitiesafterTwentyYearsFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Held-to-maturity debt securities	$ 32,836us-gaap_HeldToMaturitySecuritiesFairValue / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember

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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.

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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.

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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.

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

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

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