Other Real Estate Owned and Repossessed Assets - Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income and expenses related to other real estate owned
Net gain (loss) on sale	$ 388	$ 788	$ 2,203	$ 2,830
Write-downs	(550)	(145)	(1,323)	(376)
Net operating expenses	(509)	(176)	(1,727)	(588)
Total	(671)	467	(847)	1,866
Income and expenses related to repossessed assets
Net gain (loss) on sale	(112)	(5)	(283)	696
Write-downs	0	0	0	0
Net operating expenses	(1)	(8)	(8)	(11)
Total	$ (113)	$ (13)	$ (291)	$ 685