Accumulated Other Comprehensive Income (Details) - USD ($)		3 Months Ended						6 Months Ended
		Jun. 30, 2017		Mar. 31, 2017	Jun. 30, 2016		Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning of period				$ 2,000				$ 2,000
Other comprehensive income (loss), net of tax		$ (2,000)			$ 20,000			(3,000)	$ 89,000
Accumulated other comprehensive income (loss), end of period		(1,000)						(1,000)
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		1,000	[1]	2,000	60,000	[1]	(9,000)	2,000	(9,000)
Other comprehensive gain (loss) before reclassifications	[2]	(2,000)	[1]		20,000	[1]		(3,000)	89,000
Other comprehensive income (loss), net of tax		(2,000)	[1]		20,000	[1]		(3,000)	89,000
Accumulated other comprehensive income (loss), end of period	[1]	$ (1,000)		$ 1,000	$ 80,000		$ 60,000	$ (1,000)	$ 80,000

[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 six months ended June 30, 2017 and 2016.