Stock Based Compensation Schedule of Other Stock Option Plan Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Granted, in shares	56,650	57,258	77,784
Fair Value of Options Granted, Weighted Average Grant Date, in dollars per share	$ 5.60	$ 5.50	$ 5.63
Dividend Yield	3.88%	3.90%	3.97%
Expected Volatility	32.95%	33.55%	35.30%
Risk Free Interest Rate	1.80%	1.57%	2.19%
Expected Life, in years	7 years 6 months 21 days	7 years 7 months 28 days	6 years 10 months 6 days
Stock-Based Compensation Expense	$ 287	$ 308	$ 360
Compensation Costs for Non-vested Awards Not Yet Recognized	$ 521	$ 500	$ 478
Weighted Average Expected Vesting Period, In Years	2 years 8 months 15 days	2 years 1 month 15 days	1 year 8 months 5 days
Proceeds From Stock Options Exercised	$ 2,404	$ 917	$ 1,454
Tax Benefit for Exercises of Stock Options	188	59	25
Intrinsic Value of Stock Options Exercised	$ 1,010	$ 250	$ 170