Other Real Estate Owned - Changes in the Allowance for OREO Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in the allowance for OREO losses
Balance at the beginning of year	$ 57	$ 86	$ 56
Provision for losses			135
Charge-offs, net		(29)	(105)
Balance at the end of year	57	57	86
OREO, expenses other than provision for losses	$ 26	$ 72	$ 22