Consolidated Balance Sheets (Parenthenticals) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Fair value securities held to maturity (in dollars)	$ 6,265	$ 6,588
Preferred stock - par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock - par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	1,943,253	1,934,853
Common stock, shares outstanding	1,943,253	1,934,853