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11. Employee and Director Benefit Programs (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee And Director Benefit Programs Details 2      
Service cost $ 348 $ 346 $ 334
Interest cost 68 67 65
Net periodic cost $ 416 $ 413 $ 399
Weighted average discount rate assumption used to determine benefit obligation 5.49% 5.47% 5.47%