Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net unrealized gains and losses, beginning of period	$ (928)	$ (251)	$ (378)
Other comprehensive gain (losses), net of tax before reclassifications	(62)	(662)	131
Amounts reclassified from accumulated other comprehensive income	(5)	(15)	(4)
Net other comprehensive gain (loss)	(67)	(677)	127
Reclassification due to Accounting Standard Update (ASU 2018-02)	(196)
Net unrealized gains and losses, end of period	(1,191)	(928)	$ (251)
Parent Company [Member]
Net unrealized gains and losses, beginning of period	(928)
Net unrealized gains and losses, end of period	$ (1,191)	$ (928)