Stock Incentive Plans - Summary of Option Activity (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Number of Options
Outstanding at beginning of year (in shares) | shares	12,000
Expired (in shares) | shares	(6,000)
Outstanding and exercisable at end of year (in shares) | shares	6,000
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share) | $ / shares	$ 29.76
Expired (in dollars per shares) | $ / shares	(29.79)
Outstanding and exercisable at end of year (in dollars per share) | $ / shares	$ 29.72