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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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