Stock-Based Compensation Plans (Summary of Nonvested Stock Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Awards
Nonvested, beginning	17,351
Granted	3,000
Vested	(7,751)
Forfeited	(3,150)
Nonvested, ending	9,450	17,351
Weighted- Average Grant Date Fair Value
Nonvested, beginning	$ 7.40
Granted	5.17	$ 5.87	$ 5.95
Vested	8.13
Forfeited	5.92
Nonvested, ending	$ 6.59	$ 7.40