Income Taxes - Expense (Benefit) Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Effective Income Tax Rate Reconciliation, Amount
U.S. federal statutory tax rate (in dollars)	$ 6,892	$ 9,708	$ 10,791	$ 12,613
State and local income taxes, net of federal income tax benefit (in dollars)	1,437	2,026	2,250	2,632
Energy related tax credits (in dollars)	(81)	(314)	(129)	(408)
Other items (in dollars)	53	83	38	107
Total income tax expense (in dollars)	$ 8,301	$ 11,503	$ 12,950	$ 14,944
Effective Income Tax Rate Reconciliation, Percent
U.S. federal statutory tax rate (as a percent)	21.00%	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax benefit (as a percent)	4.40%	4.40%	4.40%	4.40%
Energy related tax credit (as a percent)	(0.30%)	(0.70%)	(0.30%)	(0.70%)
Other items (as a percent)	0.20%	0.20%	0.10%	0.20%
Total income tax expense (as a percent)	25.30%	24.90%	25.20%	24.90%