Income Taxes Income tax provision differs from federal income tax rate to pretax income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed expected tax expense	$ 3,585	$ 3,374	$ 2,749
Tax-exempt income	(829)	(959)	(1,037)
Low income housing tax credits	(120)	(211)	(6)
Other, net	79	137	225
Total income tax expense	$ 2,715	$ 2,341	$ 1,931