Securities Sold under Agreements to Repurchase (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Jun. 15, 2017	Dec. 31, 2016
Outstanding repurchase agreement		$ 15,000
Securities carrying amount	$ 0		$ 16,800
Minimum [Member]
Percentage by which fair value of pledged securities must meet or exceed gross outstanding balance	8.00%