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Equity Incentive Plan (Details) - USD ($) $ in Millions			12 Months Ended
	Feb. 23, 2019	Feb. 23, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of Common stock						700,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share based compensation			$ 3.0	$ 2.7	$ 2.4
Unrecognized compensation			$ 7.3
Unrecognized compensation recognition period			3 years 2 months 12 days
Fair Value Inputs Forfeiture Rate			0.00%
Shares Outstanding, Restricted stock granted			54,488	57,247	88,466
Intrinsic value of restricted shares			$ 1.4	$ 1.1	$ 1.1
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Shares Outstanding, Restricted stock granted			30
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	19.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	3.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.50%
Share-based Compensation Arrangement by Share-based Payment Award, Amortization Expense, Term	5 years
Performance Units [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Performance Units [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Performance Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Shares Outstanding, Restricted stock granted				31
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		2 years 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		19.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		4.36%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.37%
Share-based Compensation Arrangement by Share-based Payment Award, Amortization Expense, Term		5 years
Performance Units And Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share based compensation			$ 0.9	$ 0.3	$ 0.0
Unrecognized compensation, other than options			$ 2.5
Unrecognized compensation recognition period			3 years 4 months 24 days
Fair Value Inputs Forfeiture Rate			0.00%

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