Stock-Based Compensation Plans (Summary of Nonvested Stock Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Awards
Nonvested, beginning	21,100
Granted	2,500
Vested	(10,000)
Forfeited	(2,000)
Nonvested, ending	11,600	21,100
Weighted- Average Grant Date Fair Value
Nonvested, beginning	$ 11.77
Granted	8.81	$ 8.92	$ 15.97
Vested	12.02
Forfeited	10.33
Nonvested, ending	$ 11.10	$ 11.77