Short Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Lines Of Credit Facility
Established Lines at Year-End	$ 60,000	$ 60,000
Maximum Amount Outstanding	13,100	19,000
Average Outstanding	7,400	15,300
Notes Payable at Year-End	$ 12,000	$ 3,000
Weighted Average Interest Rate	1.54%	1.19%
Weighted Average Interest Rate at Year-End	1.71%	1.41%