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The number of quarterly installments in which awards will vest.

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Number Of Shares Granted For Non-Employee Directors Upon Re-Election

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Number of Stock-Based Compensation Plans

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Payroll Deduction For Employee Stock Purchase Plan Percentage

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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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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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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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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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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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of options vested.

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Purchase price of common stock expressed as a percentage of its fair value.

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Value, before forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Share-Based Compensation (Narrative) (Details)			12 Months Ended
Share-Based Compensation (Narrative) (Details)	May 16, 2019 USD ($) $ / shares	May 10, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) qtr plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans \| plan			3
Common stock reserved for issuance pursuant to outstanding awards \| shares			520,513	523,042
Shares granted, shares \| shares			39,550
Weighted average grant date fair value, granted (in usd per share) \| $ / shares			$ 16.44
Unvested shares \| shares			68,204	56,411
Proceeds from exercise of stock options			$ 248,000	$ 525,000
Equity based compensation expense			991,000	936,000
Unrecognized compensation cost related to non-vested equity based compensation			$ 2,300,000
Unrecognized equity based compensation weighted average period (in years)			2 years 11 months 4 days
Tax benefit from the exercise of stock options and vesting of share based payments			$ 211,000	329,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Expiration of stock options from date of grant (in years)			7 years
Weighted average remaining contractual term (in years)			3 years 7 months 9 days
Aggregate intrinsic value for all options outstanding			$ 3,500,000
Weighted average remaining contractual term for exercisable options (in years)			2 years 8 months 23 days
Aggregate intrinsic value of exercisable options			$ 3,300,000
Aggregate intrinsic value of stock options exercised			359,000	1,000,000.0
Proceeds from exercise of stock options			248,000	525,000
Fair value of shares vested			439,000	616,000
Tax benefit from the exercise of stock options and vesting of share based payments			165,000	303,000
Excess tax benefit from the exercise of stock options			42,000	155,000
Stock Options And Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based compensation expense			$ 751,000	$ 675,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance, shares \| shares			156,688
Maximum contribution per plan year			$ 6,500
Employees can purchase stock at the percentage rate of the lower of the market price on the first or last day of the offering period (as a percent)			85.00%
Shares granted, shares \| shares			17,781	16,403
Equity based compensation expense			$ 107,000	$ 117,000
Employee Stock Purchase Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deduction for employee stock purchase plan percentage			1.00%
Employee Stock Purchase Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deduction for employee stock purchase plan percentage			10.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Restricted stock units to common stock ratio, shares entitled, shares \| shares			1
Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted, shares \| shares			39,550	32,350
Weighted average grant date fair value, granted (in usd per share) \| $ / shares			$ 16.44	$ 18.67
Aggregate intrinsic value for all options outstanding			$ 1,300,000
Fair value of shares vested			$ 458,000	$ 553,000
Stock Incentive Plan [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance, shares \| shares			185,351
Common stock reserved for issuance pursuant to outstanding awards \| shares			568,717
Non Employee Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance, shares \| shares			52,000
Common stock reserved for issuance pursuant to outstanding awards \| shares			16,000
Number of shares granted for non-employee directors upon re-election, shares \| shares			2,000
Number of quarterly installments in which awards will vest \| qtr			4
Stock issued during period, shares \| shares		8,000
Stock granted, value	$ 138,000	$ 130,000
Weighted average grant date fair value, granted (in usd per share) \| $ / shares	$ 17.26	$ 16.25
Number of shares vested \| shares			4,000
Unvested shares \| shares			4,000
Aggregate intrinsic value for all options outstanding			$ 74,000
Stock Grant Plan For Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity based compensation expense			$ 133,000	$ 144,000