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Income Taxes - Reconciliation between statutory and effective tax rate (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation between statutory U.S. federal income tax rate and effective tax rate
Calculated tax expense at statutory rate	21.00%	21.00%	21.00%
Increase (decrease) in income taxes resulting from:
State taxes, net of federal income tax	5.30%	5.40%	4.80%
Tax exempt income	(0.80%)	(0.80%)	(1.00%)
Share-based compensation	(0.80%)	(0.20%)	(1.70%)
Non-deductible expenses	0.30%	0.50%	0.20%
Total income tax expense	25.00%	25.90%	23.30%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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