Basis of Presentation (Summary of stock options activity) (Details) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Shares
Outstanding at beginning of period (in shares)	125,950	215,851
Granted (in shares)	0	0
Exercised (in shares)	(55,250)	(81,401)
Forfeited (in shares)	(1,500)	(3,250)
Outstanding at end of period (in shares)	69,200	131,200
Options exercisable at end of period (in shares)	69,200	131,200
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 24.08	$ 23.85
Granted (in dollars per share)	0.00	0.00
Exercised (in dollars per share)	24.82	23.34
Forfeited (in dollars per share)	21.10	23.51
Outstanding at end of period (in dollars per share)	23.55	24.15
Options exercisable at end of period (in dollars per share)	$ 23.55	$ 24.15