Stock-Based Compensation - RSUs and Restricted Stock Awards (Details) - shares	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average closing market price, common stock, period (in days)	5 days
RSUs outstanding (in shares)	91,473	33,592
RSUs granted (in shares)	67,368
Restrictions on RSUs (in shares)	9,487
Units forfeited (in shares)	0
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average closing market price, common stock, period (in days)	5 days
RSUs outstanding (in shares)	101,267	100,402
RSUs granted (in shares)	69,547
Restrictions on RSUs (in shares)	67,621
Units forfeited (in shares)	1,061
Units forfeited and returned (in shares)	24,699
Minimum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vesting period (in years)	1 year
Minimum [Member] \| Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vesting period (in years)	1 year
Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vesting period (in years)	5 years
Maximum [Member] \| Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vesting period (in years)	3 years

Average Closing Market Price, Common Stock, Period

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- Definition

Share-Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Expirations In Period

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Number, after shares used to satisfy grantee's tax withholding obligation for award under share-based payment arrangement, of restricted shares issued. Excludes cash used to satisfy grantee's tax withholding obligation.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification
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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).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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