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11. Employee and Director Benefit Programs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee And Director Benefit Programs |  |  |
Benefit obligation at beginning of period | $ 4,361 | $ 4,174 |
Service cost | 362 | 348 | $ 346
Interest cost | 70 | 68 | 67
Benefits paid | (227) | (229) |
Benefit obligation at end of period | $ 4,566 | $ 4,361 | $ 4,174

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