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