Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (1,095)	$ (1,095)
Effect of adopting ASU	(100)	(91)
Ending balance		3,602	$ (1,095)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (1,095)	(1,095)	1,804	$ 1,381
Other comprehensive income (loss) before reclassifications, net of tax		4,708	(2,470)	29
Amounts reclassified from accumulated other comprehensive income, net of tax		(11)	(8)	97
Effect of adopting ASU			(421)	297
Net current-period other comprehensive income (loss)		4,697	(2,899)	423
Ending balance		$ 3,602	$ (1,095)	$ 1,804