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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 3,839 | $ 4,409 | $ 4,431 | $ 5,044 | $ 4,384 | $ 5,236 | $ 3,331 | $ 4,698 | $ 17,723 | $ 17,649 | $ 5,721
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | (213) | (4,860) | 4,086
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | (820) | 2,074 | 1,048
Stock based compensation |  |  |  |  |  |  |  |  | 69 | 70 | 25
Deferred income tax expense |  |  |  |  |  |  |  |  | (841) | 1,146 | (1,143)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 28,237 | 21,928 | 13,056
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  | 81,983 | 15,389 | 4,573
Purchase of available-for-sale securities |  |  |  |  |  |  |  |  | (90,402) | (102,304) | (15,262)
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (89,210) | (73,275) | (18,158)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Redemption of common stock |  |  |  |  |  |  |  |  | (5,188) | (109) |
Retirement of stock options |  |  |  |  |  |  |  |  |  | (83) |
Reissuance of treasury stock |  |  |  |  |  |  |  |  |  | 21 |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | (70) |
Cash dividends paid |  |  |  |  |  |  |  |  | (9,319) | (9,360) | (5,511)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 62,464 | 31,463 | 8,568
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 1,491 | (19,884) | 3,466
Cash and cash equivalents at beginning of year |  |  |  | 31,426 |  |  |  | 51,310 | 31,426 | 51,310 | 47,844
Cash and cash equivalents at end of year | 32,917 |  |  |  | 31,426 |  |  |  | 32,917 | 31,426 | 51,310
Peoples Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 17,723 | 17,649 | 5,721
Adjustments: |  |  |  |  |  |  |  |  |  |  |
Net realized gains on sales of securities |  |  |  |  |  |  |  |  |  | (375) | (103)
Undistributed net income of subsidiaries | (8,537) |  |  |  | (8,110) |  |  |  | (8,537) | (8,110) | 2,689
Decrease (increase) in other assets |  |  |  |  |  |  |  |  | 5,257 | 1,182 | (1,733)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | (69) | (511) | 641
Stock based compensation |  |  |  |  |  |  |  |  | 69 | 70 | 25
Deferred income tax expense |  |  |  |  |  |  |  |  |  |  | 1
Increase in due from subsidiaries |  |  |  |  |  |  |  |  |  |  | (1,611)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 14,443 | 9,905 | 5,630
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  | 722 | 253
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  | 722 | 253
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Redemption of common stock |  |  |  |  |  |  |  |  | (5,188) | (109) |
Retirement of stock options |  |  |  |  |  |  |  |  |  | (83) |
Reissuance of treasury stock |  |  |  |  |  |  |  |  |  | 21 |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | (70) |
Cash dividends paid |  |  |  |  |  |  |  |  | (9,319) | (9,360) | (5,511)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (14,507) | (9,601) | (5,511)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (64) | 1,026 | 372
Cash and cash equivalents at beginning of year |  |  |  | $ 4,183 |  |  |  | $ 3,157 | 4,183 | 3,157 | 2,785
Cash and cash equivalents at end of year | $ 4,119 |  |  |  | $ 4,183 |  |  |  | $ 4,119 | $ 4,183 | $ 3,157

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