Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Real Estate Owned Expense [Line Items]
OREO	$ 8,651	$ 6,574
OREO expense, net of rental income and gains on sale	837	98	$ 190
OREO operating expense
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	420	304	224
Impairment on OREO
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	904	187	361
Rental income on OREO
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	(116)	(98)	(80)
Gains on sale of OREO
Other Real Estate Owned Expense [Line Items]
OREO expense, net of rental income and gains on sale	$ (371)	$ (295)	$ (315)