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Fair Value of Derivative and Other Financial Instruments - Items Recorded at Fair Value (Details) - Public Service Company of New Mexico - Measured on a recurring basis - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 463,126 $ 440,115
Unrealized Gains 15,741 27,387
Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 7,895 6,107
Corporate stocks, common    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 97,626 85,271
Unrealized Gains  
Corporate stocks, preferred    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 9,114 9,910
Unrealized Gains  
Mutual funds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 75,285 58,817
Unrealized Gains  
U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 43,128 55,839
Unrealized Gains 214 950
International government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 16,001 16,032
Unrealized Gains 1,508 2,537
Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 47,050 50,139
Unrealized Gains 1,807 2,779
Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 167,027 158,000
Unrealized Gains 12,212 21,121
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 197,741 183,330
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 7,895 6,107
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, common    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 97,626 85,271
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, preferred    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 3,775 3,608
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 75,241 58,762
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 13,204 29,579
Quoted Prices in Active Markets for Identical Assets (Level 1) | International government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0 3
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 265,385 256,785
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0 0
Significant Other Observable Inputs (Level 2) | Corporate stocks, common    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 0 0
Significant Other Observable Inputs (Level 2) | Corporate stocks, preferred    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 5,339 6,302
Significant Other Observable Inputs (Level 2) | Mutual funds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 44 55
Significant Other Observable Inputs (Level 2) | U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 29,924 26,260
Significant Other Observable Inputs (Level 2) | International government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 16,001 16,032
Significant Other Observable Inputs (Level 2) | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 47,050 50,139
Significant Other Observable Inputs (Level 2) | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 167,027 $ 157,997