Employee Stock Purchase Plan (ESPP), Payroll Deductions

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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- Definition

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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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- 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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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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

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No definition available.

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- Definition

Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Compensation - Textual (Details)		12 Months Ended
Share-Based Compensation - Textual (Details)	Jun. 02, 2017 shares	Dec. 31, 2020 USD ($) plan $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans \| plan		4
Share-based compensation expense \| $		$ 470,000	$ 555,000	$ 482,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements \| $		0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deductions	1.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deductions	15.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit of stock option compensation expense \| $		76,000	46,000	142,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $		449,000	$ 533,000	$ 459,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements \| $		$ 225,000
Granted (shares)		21,397	25,420
Granted (in dollars per share) \| $ / shares		$ 16.42	$ 19.77
Nonvested outstanding shares (in shares)		30,013	45,160	63,529	63,768
Equity instruments other than options weighted average remaining period		10 months 6 days
Aggregate intrinsic value \| $		$ 2,507,000
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		0	0	0
2005 Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan		0
Award expiration period		10 years
Award vesting period		5 years
2005 Plan \| Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
2005 Plan \| Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan		875,000
Number of shares reserved for issuance		768,560
2015 Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period		10 years
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance		457,928
Discount from market price	10.00%
Reserved for future issuance (in shares)	500,000
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan		38,400
Award expiration period		10 years
Award vesting period		5 years
2007 Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan		0