Accumulated Other Comprehensive Income (Details) - USD ($)		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), beginning of period		$ 2,000
Other comprehensive income (loss), net of tax		(1,000)	$ 69,000
Accumulated other comprehensive income (loss), end of period		1,000
Amount reclassified from accumulated other comprehensive income		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]	2,000	(9,000)
Other comprehensive gain (loss) before reclassifications	[1],[2]	(1,000)	69,000
Other comprehensive income (loss), net of tax	[1]	(1,000)	69,000
Accumulated other comprehensive income (loss), end of period	[1]	$ 1,000	$ 60,000

[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 quarter ended March 31, 2017 and 2016.