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11. Employee and Director Benefit Programs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee And Director Benefit Programs Details      
Benefit obligation at beginning of period $ 3,812 $ 3,581  
Service cost 334 348 $ 336
Interest cost 65 67 65
Benefits paid (218) (184)  
Reversal of excess accrual 0 0  
Benefit obligation at end of period $ 3,993 $ 3,812 $ 3,581