Income Taxes - Charged to operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Current tax expense	$ 3,104	$ 5,519
Deferred income tax (benefit)	(866)	1,327
Income Tax Expense (Benefit), Total	$ 2,238	$ 6,846