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Significant Accounting Policies and Responsibility for Financial Statements (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 30, 2021 | Jul. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Payment defaults under agreements |  |  | $ 0 |  | $ 0 |
Dividends declared per common share (dollars per share) |  | $ 0.3075 | $ 0.3275 | $ 0.3080 | $ 0.6550 | $ 0.6150
Dividends declared on common stock |  |  |  |  | $ 28,111,000 | $ 24,493,000
Subsequent event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends declared per common share (dollars per share) | $ 0.3275 |  |  |  |  |
PNM |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends declared on common stock |  |  |  | $ 40,700,000 |  | 40,654,000
Texas-New Mexico Power Company |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dividends declared on common stock |  |  |  | $ 7,092,000 |  | $ 18,439,000

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