Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized	20,000	20,000
Preferred stock, shares issued	783	783
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	10,589,704	10,495,704
Common stock, shares outstanding	10,538,627	10,444,627
Treasury stock, shares	51,077	51,077