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Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 2,452 | $ 2,195 | $ 12,577 | $ 14,948
Flow through related to deduction of meters and mixed service costs | (5,689) | (2,401) | (19,212) | (19,835)
Tax effect of regulatory treatment of utility plant differences | (1,525) | (976) | (5,212) | (7,298)
State income tax expense | 232 | 78 | 798 | 901
Tax credits | (1,135) |  | (1,135) |
Other | (145) | 105 | (254) | (551)
Total income tax benefit | $ (5,810) | $ (999) | $ (12,438) | $ (11,835)
Federal income taxes at statutory rates | 21.00% | 21.00% | 21.00% | 21.00%
Flow through related to deduction of meters and mixed service costs | (48.70%) | (23.00%) | (32.10%) | (27.90%)
Tax effect of regulatory treatment of utility plant differences | (13.10%) | (9.30%) | (8.70%) | (10.30%)
State income tax expense | 2.00% | 0.70% | 1.30% | 1.30%
Tax credits | (9.70%) |  | (1.90%) |
Other | (1.30%) | 1.00% | (0.40%) | (0.70%)
Total income tax benefit | (49.80%) | (9.60%) | (20.80%) | (16.60%)

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