Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for loan losses	$ 12,387	$ 12,382
Common stock, par value	$ 0.01	$ 0.01
Common stock, Authorized	20,000,000	20,000,000
Common stock, shares Issued	7,389,394	7,324,233
Common stock, shares outstanding	7,389,394	7,324,233