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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Federal income tax at statutory rate                 $ 9,323 $ 8,607 $ 7,785
Federal income tax related to tax reform legislation                 2,623    
Tax exempt interest                 (2,157) (2,264) (2,008)
Bank owned life insurance income                 (269) (277) (268)
Residential housing program tax credits                 (1,095) (1,128) (1,115)
Other, net                 (245) 70 127
Total income tax expense (benefit) $ 3,971 $ 1,287 $ 1,653 $ 1,269 $ 1,223 $ 1,390 $ 1,238 $ 1,157 8,180 5,008 4,521
Peoples Bank                      
Total income tax expense (benefit)                 $ (54) $ (75) $ (70)