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Parent Company financial statements - Condensed Statements of Income and Comprehensive Income (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
Interest income:                      
Dividends from subsidiaries                 $ 52 $ 48 $ 35
Expense:                      
Income before income taxes $ 6,619 $ 6,637 $ 7,312 $ 6,069 $ 5,951 $ 6,508 $ 6,093 $ 6,039      
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
Net income $ 2,648 $ 5,350 $ 5,659 $ 4,800 $ 4,728 $ 5,118 $ 4,855 $ 4,882 18,457 19,583 17,723
Comprehensive Income                 17,500 17,553 16,427
Peoples Bank                      
Interest income:                      
Dividends from subsidiaries                 9,319 9,170 9,319
Other income                 52 46 40
Total income                 9,371 9,216 9,359
Expense:                      
Other expenses                 205 259 243
Total expenses                 205 259 243
Income before income taxes                 9,166 8,957 9,116
Income tax expense (benefit)                 (54) (75) (70)
Income before undistributed income of subsidiaries                 9,220 9,032 9,186
Equity in undistributed net income (loss) of subsidiaries                 9,237 10,551 8,537
Net income                 18,457 19,583 17,723
Comprehensive Income                 $ 17,500 $ 17,553 $ 16,427