Other Real Estate Owned and Repossessed Assets - Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income and expenses related to other real estate owned
Net gain (loss) on sale	$ 744	$ 756
Write-downs	(294)	(651)
Net operating expenses	(307)	(397)
Total	143	(292)
Income and expenses related to repossessed assets
Net gain (loss) on sale	(18)	(34)
Write-downs	0	0
Net operating expenses	(3)	(1)
Total	$ (21)	$ (35)