Stock-Based Compensation (Summary of Stock Option Activity) (Details)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of Shares
Outstanding - beginning of year (in shares) | shares	38,000
Granted (in shares) | shares	0
Exercised (in shares) | shares	(24,907)
Canceled or expired (in shares) | shares	0
Outstanding - end of period (in shares) | shares	13,093
Options exercisable (in shares) | shares	13,093
Weighted Average Exercise Price
Outstanding - beginning of year (in dollars per share) | $ / shares	$ 19.30
Granted (in dollars per share) | $ / shares	0.00
Exercised (in dollars per share) | $ / shares	21.22
Canceled or expired (in dollars per share) | $ / shares	0.00
Outstanding - end of period (in dollars per share) | $ / shares	15.61
Options exercisable (in dollars per share) | $ / shares	$ 15.61