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Parent Company financial statements - Condensed Statements of Cash Flows (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
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 2,648 | $ 5,350 | $ 5,659 | $ 4,800 | $ 4,728 | $ 5,118 | $ 4,855 | $ 4,882 | $ 18,457 | $ 19,583 | $ 17,723
Adjustments: |  |  |  |  |  |  |  |  |  |  |
(Decrease) increase in other assets |  |  |  |  |  |  |  |  | 2,023 | 1,373 | (213)
Decrease in other liabilities |  |  |  |  |  |  |  |  | (1,817) | (2,470) | (820)
Stock based compensation |  |  |  |  |  |  |  |  | 177 | 71 | 69
Deferred income tax expense |  |  |  |  |  |  |  |  | 1,665 | (1,442) | (841)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 28,593 | 28,053 | 29,179
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities available-for-sale |  |  |  |  |  |  |  |  | 0 | 27,408 | 81,983
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (73,471) | (62,022) | (90,402)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (184,563) | (186,357) | (89,415)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Redemption of common stock |  |  |  |  |  |  |  |  |  | (604) | (5,188)
Cash dividends paid |  |  |  |  |  |  |  |  | (9,319) | (9,170) | (9,319)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 153,517 | 165,328 | 61,727
Decrease in cash |  |  |  |  |  |  |  |  | (2,453) | 7,024 | 1,491
Cash and cash equivalents at beginning of year |  |  |  | 39,941 |  |  |  | 32,917 | 39,941 | 32,917 | 31,426
Cash and cash equivalents at end of year | 37,488 |  |  |  | 39,941 |  |  |  | 37,488 | 39,941 | 32,917
Peoples Bank |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 18,457 | 19,583 | 17,723
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Undistributed net income of subsidiaries | (9,237) |  |  |  | (10,551) |  |  |  | (9,237) | (10,551) | (8,537)
(Decrease) increase in other assets |  |  |  |  |  |  |  |  | (3) | 577 | 5,257
Decrease in other liabilities |  |  |  |  |  |  |  |  | (53) | (77) | (69)
Stock based compensation |  |  |  |  |  |  |  |  | 177 | 71 | 69
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 9,341 | 9,603 | 14,443
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities available-for-sale |  |  |  |  |  |  |  |  | (43) |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (43) |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Redemption of common stock |  |  |  |  |  |  |  |  |  | (604) | (5,188)
Reissuance of treasury stock |  |  |  |  |  |  |  |  | 5 |  |
Cash dividends paid |  |  |  |  |  |  |  |  | (9,319) | (9,170) | (9,319)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (9,314) | (9,774) | (14,507)
Decrease in cash |  |  |  |  |  |  |  |  | (16) | (171) | (64)
Cash and cash equivalents at beginning of year |  |  |  | $ 3,948 |  |  |  | $ 4,119 | 3,948 | 4,119 | 4,183
Cash and cash equivalents at end of year | $ 3,932 |  |  |  | $ 3,948 |  |  |  | $ 3,932 | $ 3,948 | $ 4,119

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