Stock Based Compensation, Stock Option Activity (Details) - Stock Options [Member] - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Options outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	24,669	83,861
Exercised (in shares)	(3,398)	(51,390)
Expired (in shares)	(1,006)	(7,802)
Outstanding at end of period (in shares)	20,265	24,669
Exercisable at end of period (in shares)	20,265	22,924
Weighted average exercise price [Roll forward]
Outstanding at beginning of period (in dollars per share)	$ 12.17	$ 12.39
Exercised (in dollars per share)	14.94	11.53
Expired (in dollars per share)	17.88	18.76
Outstanding at end of period (in dollars per share)	11.42	12.17
Exercisable at end of period (in dollars per share)	$ 11.42	$ 12.13