Consolidated Balance Sheets [Parenthetical] - $ / shares |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| 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) | 5,027 | 5,715 |
| Preferred stock, shares outstanding (in shares) | 5,027 | 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) | 1,430,854 | 1,428,261 |
| Common stock, shares outstanding (in shares) | 1,430,854 | 1,428,261 |