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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (SIP) (Details) - shares	12 Months Ended
	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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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).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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).

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Gross number of share options (or share units) granted during the period.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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