Other Real Estate Owned - Changes in OREO (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Foreclosed Property [Roll Forward]
Beginning balance	$ 3,536	$ 7,435	$ 7,435
Net proceeds from sales	(1,763)	(461)	(5,465)
Net gains (losses) on sales	387	(18)	678
Transfers in	44	107	859
Cash additions	33		290
Impairment charge	(106)	(58)	(261)
Ending balance	$ 2,131		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	0		(6)
Ending balance	$ 208		236
Tax Lien
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	30
Foreclosed Property [Roll Forward]
Beginning balance	$ 3,300	$ 7,215	7,215
Net proceeds from sales	(1,730)		(5,458)
Net gains (losses) on sales	382		677
Transfers in	44		831
Cash additions	33		290
Impairment charge	(106)		(255)
Ending balance	$ 1,923		$ 3,300