Borrowed Funds - Schedule of Borrowed Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Balance
Short-term borrowed funds	$ 2,500	$ 9,500
Long-term borrowed funds	23,500	34,500
Total borrowed funds	26,000	44,000
Average Balance
Short-term borrowed funds	4,588	2,341
Long-term borrowed funds	35,949	35,141
Borrowed funds	$ 40,537	$ 37,482
Average Rate
Short-term borrowed funds	2.82%	3.34%
Long-term borrowed funds	3.03%	3.06%