CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Securities held to maturity, estimated fair value	$ 3,627	$ 3,776
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	10,000,000	10,000,000
Common stock, shares issued (shares)	5,310,076	5,310,076
Treasury stock, at cost (shares)	548,647	559,054