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11. Employee and Director Benefit Programs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee And Director Benefit Programs Details      
Benefit obligation at beginning of period $ 3,993 $ 3,812  
Service cost 346 334 $ 348
Interest cost 67 65 67
Benefits paid (232) (218)  
Benefit obligation at end of period $ 4,174 $ 3,993 $ 3,812