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Provision for income taxes - Provision for income taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Provision for income taxes
Total provision for income taxes	$ 1,852	$ 1,528	$ 5,058	$ 4,970
Expected tax expense, at the U.S. federal statutory income tax rate of 21%	$ 1,598	$ 1,361	$ 4,401	$ 4,427
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%	21.00%
State income taxes	$ 230	$ 194	$ 631	$ 633
FDII benefit	(17)	(34)	(57)	(106)
Other, net	41	7	83	16
Total provision for income taxes	1,852	1,528	5,058	4,970
Disclosure Other Comprehensive Income Loss Tax Effects Allocation to Component Of Other Comprehensive Income Loss [Abstract]
Net income	1,852	1,528	5,058	4,970
Other comprehensive loss - marketable securities	8	0	(23)	0
Total	$ 1,860	$ 1,528	$ 5,035	$ 4,970

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Disclosure Other Comprehensive Income Loss Tax Effects Allocated To Component Of Other Comprehensive Income Loss.

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

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Amount of reported income tax benefit from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to foreign-derived intangible income (FDII).

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

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 other adjustments.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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