Consolidated Balance Sheets [Parenthetical] - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, par value (in dollars per share)	$ 4	$ 4
Preferred stock, liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	5,715	5,715
Preferred stock, shares outstanding (in shares)	5,715	5,715
Common stock, par value (in dollars per share)	$ 4	$ 4
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	1,428,261	1,417,775
Common stock, shares outstanding (in shares)	1,428,261	1,417,775