Other Real Estate Owned - Changes in OREO (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Foreclosed Property [Roll Forward]
Beginning balance	$ 3,536	$ 7,435	$ 7,435
Net proceeds from sales	(1,891)	(799)	(5,465)
Net gains (losses) on sales	400	50	678
Transfers in	44	454	859
Cash additions	35		290
Impairment charge	(192)	(89)	(261)
Ending balance	$ 1,932		3,536
Loans
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	1
Foreclosed Property [Roll Forward]
Beginning balance	$ 236	220	220
Net proceeds from sales	(33)		(7)
Net gains (losses) on sales	5		1
Transfers in	0		28
Cash additions	0		0
Impairment charge	(27)		(6)
Ending balance	$ 181		236
Tax Lien
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	24
Foreclosed Property [Roll Forward]
Beginning balance	$ 3,300	$ 7,215	7,215
Net proceeds from sales	(1,858)		(5,458)
Net gains (losses) on sales	395		677
Transfers in	44		831
Cash additions	35		290
Impairment charge	(165)		(255)
Ending balance	$ 1,751		$ 3,300