Stock-Based Compensation (Stock Option Plans) (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance, Beginning of Period, Shares	21,500	26,000	21,500	29,500
Options Granted, Shares	0	0	0	0
Options Exercised, Shares	0	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(2,000)	(1,000)	(2,000)	(4,500)
Balance, End of Period, Shares	19,500	25,000	19,500	25,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Balance, Beginning of Period, Weighted Avg. Exercise Price	$ 23.57	$ 23.50	$ 23.57	$ 23.55
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	0.00	0.00	0.00	0.00
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	0.00	0.00	0.00	0.00
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	24.34	23.49	24.34	23.82
Balance, End of Period, Weighted Avg. Exercise Price	$ 23.49	$ 23.50	$ 23.49	$ 23.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Exercisable, Shares	19,100	20,700	19,100	20,700
Options Available For Grant	50,000	50,000	50,000	50,000