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Equity Incentive Plan (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 23, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of Common stock					700,000
Common Stock, Capital Shares Reserved for Future Issuance		695,459
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Recognized share based compensation		$ 3.2	$ 3.0	$ 2.7
Unrecognized compensation, other than options		$ 7.9
Unrecognized compensation recognition period		3 years 2 months 12 days
Fair value inputs forfeiture rate		0.00%
Intrinsic value of restricted shares		$ 1.6	1.4	1.1
Performance Units And Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Recognized share based compensation		1.5	$ 0.9	$ 0.3
Unrecognized compensation, other than options		$ 3.3
Unrecognized compensation recognition period		3 years 1 month 6 days
Fair value inputs forfeiture rate		0.00%
Amortization period of compensation expense	5 years
Expected term (years)		2 years 10 months 24 days	2 years 10 months 24 days	2 years 10 months 24 days
Volatility		18.40%	19.70%	19.10%
Dividend yield		2.90%	3.40%	4.40%
Risk-free rate		1.30%	2.50%	2.40%
Performance Units And Shares [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage	50.00%
Performance Units And Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vesting percentage	50.00%
Performance Units And Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years

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