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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, 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
Interest income:                      
Dividends from subsidiaries                 $ 84 $ 72 $ 52
Unrealized holding gains on equity securities                 132 14  
Expense:                      
Income before income taxes $ 5,478 $ 8,139 $ 8,101 $ 7,173 $ 7,296 $ 7,619 $ 6,768 $ 6,628      
Income tax expense 446 991 957 761 904 902 811 774 3,155 3,391 8,180
Net income $ 5,032 $ 7,148 $ 7,144 $ 6,412 $ 6,392 $ 6,717 $ 5,957 $ 5,854 25,736 24,920 18,457
Comprehensive Income                 30,607 23,648 17,500
Peoples Bank                      
Interest income:                      
Dividends from subsidiaries                 10,131 9,691 9,319
Other income                 8 72 52
Unrealized holding gains on equity securities                 132 13  
Total income                 10,271 9,776 9,371
Expense:                      
Other expenses                 145 214 205
Total expenses                 145 214 205
Income before income taxes                 10,126 9,562 9,166
Income tax expense                 (1) (27) (54)
Income before undistributed income of subsidiaries                 10,127 9,589 9,220
Equity in undistributed net income of subsidiaries                 15,609 15,331 9,237
Net income                 25,736 24,920 18,457
Comprehensive Income                 $ 30,607 $ 23,523 $ 17,500