Other Comprehensive Income - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of securities, net	$ (3)	$ (20)	$ (9)	$ (20)
Tax expense	1	7	3	7
Reclassifications Out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of securities, net	(3)	(20)	(9)	(20)
Tax expense	1	7	3	7
Net earnings	$ (2)	$ (13)	$ (6)	$ (13)