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Income taxes - Current and Deferred Amounts of Provision for Income Taxes Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Current |  |  |  |  |  |  |  |  | $ 2,761 | $ 4,072 | $ 6,515
Deferred |  |  |  |  |  |  |  |  | 394 | (681) | 1,665
Total income tax expense (benefit) | $ 446 | $ 991 | $ 957 | $ 761 | $ 904 | $ 902 | $ 811 | $ 774 | 3,155 | 3,391 | 8,180
Peoples Bank |  |  |  |  |  |  |  |  |  |  |
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | $ (1) | $ (27) | $ (54)

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