Income Taxes - Components of Low Income Housing Investment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes
Low income housing tax credits	$ 111	$ 180	$ 333	$ 540
Low income housing investment losses	$ 118	$ 217	$ 353	$ 651