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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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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