Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income and Comprehensive Income [Abstract]
Net Income	$ 202	$ 252	$ 453	$ 439
Unrealized holding gains on available-for-sale securities
Unrealized holding gains arising during the period	(8)	(45)	21	75
Reclassification adjustment for net gains included in net income on securities available-for-sale	0	(24)	0	(24)
Reclassification adjustment for net gains included in net income on securities held-to-maturity	0	(12)	0	(12)
Net unrealized gain on available for sale securities	(8)	(81)	21	39
Accretion of net unrealized loss on securities transferred to held-to-maturity	0	68	0	323
Other comprehensive income, before tax	(8)	(13)	21	362
Tax effect	(3)	(5)	7	128
Other comprehensive income, net of tax	(5)	(8)	14	234
Comprehensive income	197	244	467	673
Tax Effect Allocated to Each Component of Other Comprehensive Income
Unrealized holding gains (losses) arising during the period	3	16	(7)	(25)
Reclassification adjustment for net gains included in net income on securities available-for-sale	0	8	0	8
Reclassification adjustment for net gains included in net income on securities held-to-maturity	0	4	0	4
Accretion of net unrealized loss on securities transferred to held-to-maturity	0	(23)	0	(115)
Income tax effect related to other comprehensive income (loss)	$ 3	$ 5	$ (7)	$ (128)