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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (SIP) (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares to be issued in stock incentive plan (in shares) | 149,983 |  |
Options, Grants in Period, Gross |  | 0 | 0
RSA/RSU, Grants in Period, Gross | 26,700 | 28,700 | 18,391
Employee Discount for Employee Stock Purchase Plan | 5.00% |  |
Employee Stock Purchase Plan, Number Of Shares Authorized | 600,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 8,899 | 0 | 0
Stock Unit Awards and Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
RSA/RSU, Grants in Period, Gross |  |  | 18,391
Stock Unit Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
RSA/RSU, Grants in Period, Gross | 26,700 | 28,700 |

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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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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