Basis of Presentation (Summary of stock options activity) (Details) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Shares
Outstanding at beginning of period (in shares)	125,950	215,851
Granted (in shares)	0	0
Exercised (in shares)	(35,000)	(56,650)
Forfeited (in shares)	(1,500)	(2,250)
Outstanding at end of period (in shares)	89,450	156,951
Options exercisable at end of period (in shares)	89,450	156,951
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)	23.53	22.85
Forfeited (in dollars per share)	21.10	23.88
Outstanding at end of period (in dollars per share)	24.34	24.18
Options exercisable at end of period (in dollars per share)	$ 24.34	$ 24.18