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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest income:                      
Dividends from subsidiaries                 $ 72 $ 52 $ 48
Unrealized holding gains on equity securities                 14   623
Expense:                      
Income before income taxes $ 7,296 $ 7,619 $ 6,768 $ 6,628 $ 6,619 $ 6,637 $ 7,312 $ 6,069      
Income tax expense (benefit) 904 902 811 774 3,971 1,287 1,653 1,269 3,391 8,180 5,008
Net income $ 6,392 $ 6,717 $ 5,957 $ 5,854 $ 2,648 $ 5,350 $ 5,659 $ 4,800 24,920 18,457 19,583
Comprehensive Income                 23,648 17,500 17,553
Peoples Bank                      
Interest income:                      
Dividends from subsidiaries                 9,691 9,319 9,170
Other income                 72 52 46
Unrealized holding gains on equity securities                 13    
Total income                 9,776 9,371 9,216
Expense:                      
Other expenses                 214 205 259
Total expenses                 214 205 259
Income before income taxes                 9,562 9,166 8,957
Income tax expense (benefit)                 (27) (54) (75)
Income before undistributed income of subsidiaries                 9,589 9,220 9,032
Equity in undistributed net income of subsidiaries                 15,331 9,237 10,551
Net income                 24,920 18,457 19,583
Comprehensive Income                 $ 23,523 $ 17,500 $ 17,553