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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal income tax at statutory rate									$ 6,067	$ 5,945	$ 9,323
Effect of federal income tax rate changes											2,623
Tax exempt interest									(1,299)	(1,320)	(2,157)
Bank owned life insurance income									(159)	(236)	(269)
Residential housing program tax credits									(1,094)	(1,094)	(1,095)
Other, net									(360)	96	(245)
Total income tax expense (benefit)	$ 446	$ 991	$ 957	$ 761	$ 904	$ 902	$ 811	$ 774	$ 3,155	$ 3,391	$ 8,180
Federal income tax at statutory rate									21.00%	21.00%	35.00%
Effect of federal income tax rate change (note 1)											0.0985
Tax exempt interest									(4.50%)	(4.66%)	(8.10%)
Bank owned life insurance income									(0.55%)	(0.83%)	(1.01%)
Residential housing program tax credits									(3.79%)	(3.87%)	(4.11%)
Other, net									(1.25%)	0.34%	(0.92%)
Total									10.91%	11.98%	30.71%
Peoples Bank
Total income tax expense (benefit)									$ (1)	$ (27)	$ (54)

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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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