Accumulated Other Comprehensive Income (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning of period				$ (47,000)
Other comprehensive loss, net of tax		$ (16,000)	$ (3,000)	(85,000)	$ (6,000)
Accumulated other comprehensive loss, end of period		(132,000)		(132,000)
Amount reclassified from accumulated other comprehensive income		0	0	0	0
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning of period	[1]	(116,000)	(1,000)	(47,000)	2,000
Other comprehensive loss before reclassifications	[1],[2]	(16,000)	(3,000)	(85,000)	(6,000)
Other comprehensive loss, net of tax	[1]	(16,000)	(3,000)	(85,000)	(6,000)
Accumulated other comprehensive loss, end of period	[1]	$ (132,000)	$ (4,000)	$ (132,000)	$ (4,000)

[1] All amounts are net of tax. Amounts in parentheses indicate a reduction of other comprehensive income.

[2] There were no amounts reclassified out of other comprehensive income for the three and nine months ended September 30, 2018 and 2017.