Other Real Estate Owned - Changes in OREO (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Foreclosed Property [Roll Forward]
Beginning balance	$ 7,435,000	$ 9,779,000	$ 9,779,000
Net proceeds from sales	(461,000)	(648,000)	(6,465,000)
Net gains (losses) on sales	(18,000)	280,000	919,000
Transfers in	107,000	1,087,000	4,342,000
Cash additions	91,000		558,000
OREO Transfers to Loans	(995,000)
Impairment charge	(58,000)	(130,000)	(703,000)
Ending balance	$ 7,096,000		7,435,000
Loans [Member]
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	2
Foreclosed Property [Roll Forward]
Beginning balance	$ 220,000	349,000	349,000
Net proceeds from sales	(6,000)		(1,735,000)
Net gains (losses) on sales	1,000		60,000
Transfers in	28,000		1,671,000
Cash additions	0		0
OREO Transfers to Loans	0
Impairment charge	0		(125,000)
Ending balance	$ 243,000		220,000
Tax Lien [Member]
Real Estate Owned Disclosure [Line Items]
Number of Real Estate Properties | property	53
Foreclosed Property [Roll Forward]
Beginning balance	$ 7,215,000	$ 9,430,000	9,430,000
Net proceeds from sales	(455,000)		(4,730,000)
Net gains (losses) on sales	(19,000)		859,000
Transfers in	79,000		2,671,000
Cash additions	91,000		558,000
OREO Transfers to Loans	(995,000)
Impairment charge	(58,000)		(578,000)
Ending balance	$ 6,853,000		$ 7,215,000