Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Other real estate owned, valuation allowance	$ 147	$ 192
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 5	$ 5
Preferred stock, authorized (in shares)	2,000,000	2,000,000
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	20,000,000	20,000,000
Common stock, outstanding (in shares)	8,650,574	8,618,051