Other Real Estate Owned - Changes in OREO (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) property	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Foreclosed Property [Roll Forward]
Beginning balance	$ 7,435	$ 9,779	$ 9,779
Net proceeds from sales	(1,127)	(4,436)	(6,465)
Net gains (losses) on sales	7	769	919
Transfers in	821	3,968	4,342
Cash additions	243		558
OREO Transfers to Loans			(995)
Impairment charge	(143)	(659)	(703)
Ending balance	$ 7,236		7,435
Loans [Member]
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	2
Foreclosed Property [Roll Forward]
Beginning balance	$ 220	349	349
Net proceeds from sales	(6)		(1,735)
Net gains (losses) on sales	1		60
Transfers in	28		1,671
Cash additions	0		0
OREO Transfers to Loans			0
Impairment charge	0		(125)
Ending balance	$ 243		220
Tax Lien [Member]
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	47
Foreclosed Property [Roll Forward]
Beginning balance	$ 7,215	$ 9,430	9,430
Net proceeds from sales	(1,121)		(4,730)
Net gains (losses) on sales	6		859
Transfers in	793		2,671
Cash additions	243		558
OREO Transfers to Loans			(995)
Impairment charge	(143)		(578)
Ending balance	$ 6,993		$ 7,215