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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income taxes
Federal income tax at statutory rate									$ 7,177	$ 6,067	$ 5,945
Tax exempt interest									(1,032)	(1,299)	(1,320)
Bank owned life insurance income									(299)	(159)	(236)
Residential housing program tax credits									(1,094)	(1,094)	(1,094)
Other, net									69	(360)	96
Total income tax expense (benefit)	$ 1,308	$ 1,523	$ 1,311	$ 679	$ 446	$ 991	$ 957	$ 761	$ 4,821	$ 3,155	$ 3,391
Federal income tax at statutory rate									21.00%	21.00%	21.00%
Tax exempt interest									(3.02%)	(4.50%)	(4.66%)
Bank owned life insurance income									(0.87%)	(0.55%)	(0.83%)
Residential housing program tax credits									(3.20%)	(3.79%)	(3.87%)
Other, net									0.19%	(1.25%)	0.34%
Total									14.10%	10.91%	11.98%

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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 nondeductible life insurance expenses.

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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 investment tax credit.

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