Incentive and Restricted Stock Plan and Dividend Reinvestment Plan - Nonstatutory Stock Options Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Nonstatutory Stock Option Activity (shares) [Roll Forward]
Outstanding, beginning of year (in shares)	0	155,500	428,900
Granted (in shares)	0	0	0
Exercised (in shares)	0	0	0
Forfeited (in shares)	0	0	(273,400)
Expired (in shares)	0	(155,500)	0
Outstanding, End of year (in shares)	0	0	155,500
Exercisable at End of Year (in shares)	0	0	155,500
Nonstatutory Stock Options, Outstanding, Weighted Average Exercise Price (dollars per share) [Abstract]
Outstanding at beginning of year (in dollars per share)	$ 0.00	$ 37.86	$ 37.36
Granted (in dollars per share)	0.00	0.00	0.00
Exercised (in dollars per share)	0.00	0.00	0.00
Forfeited (in dollars per share)	0.00	0.00	37.08
Expired (in dollars per share)	0.00	37.86	0.00
Outstanding and End of Year (in dollars per share)	0.00	0.00	37.86
Exercisable at End of Year (in dollars per share)	$ 0.00	$ 0.00	$ 37.86
Outstanding at End of Year (in years)	0 years	0 years	1 year
Exercisable at End of Year (in years)	0 years	0 years	1 year