Pre tax compensation expense related to director fees, annual retainers, and deferred compensation amortization.

No definition available.

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- Definition

Weighted average purchase price of capital shares purchased through an employee stock purchase plan.

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Number Of Directors

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Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Annual Vesting Percentage

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No definition available.

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

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No definition available.

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Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage

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No definition available.

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Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face amount or stated value per share of common stock.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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No definition available.

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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

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No definition available.

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Percentage of vesting of share-based compensation awards.

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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

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Amount of stock repurchase plan authorized.

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Stockholders' Equity (Narrative) (Details)								3 Months Ended				9 Months Ended
Stockholders' Equity (Narrative) (Details)	Sep. 01, 2018 USD ($) $ / shares	Jun. 01, 2018 USD ($) $ / shares	May 15, 2018	Mar. 01, 2018 USD ($) $ / shares	Sep. 01, 2017 USD ($) $ / shares	Jun. 01, 2017 USD ($) $ / shares	Mar. 01, 2017 USD ($) $ / shares	Sep. 30, 2018 USD ($) director $ / shares shares	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2018 USD ($) director $ / shares shares	Sep. 30, 2017 USD ($) $ / shares	May 16, 2018 USD ($)	Dec. 31, 2017 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Par or Stated Value Per Share \| $ / shares								$ 0.01				$ 0.01			$ 0.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value \| $														$ 25,000
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value \| $												$ 88,205
Shares Reserved (in shares)								1,953,000				1,953,000
Shares Available to Issue (in shares)								1,405,000				1,405,000
Options Outstanding (in shares)								1,658,000				1,658,000
Performance Awards Outstanding (in shares)								526,000				526,000
Weighted aerage grant date fair value (in usd per share) \| $ / shares												$ 22.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross												3,926
Number of directors \| director								3				3
Directors compensation expense \| $								$ 133,000			$ 90,000	$ 336,000	$ 271,000
Stock repurchase program, authorized amount \| $								$ 26,000,000				$ 26,000,000
Dividends declared per common share (in dollars per Share) \| $ / shares	$ 0.075	$ 0.075		$ 0.075	$ 0.050	$ 0.05	$ 0.05	$ 0.075			$ 0.05	$ 0.225	$ 0.150
Dividends \| $	$ 1,436,000	$ 1,433,000		$ 1,207,000	$ 835,000	$ 835,000	$ 833,000
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance								50.00%
Risk-free interest rate								1.72%	1.61%	1.44%
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage								200.00%				200.00%
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield												0.01%
Shares purchased through Employee Stock Purchase Plan (in Shares)								12,506				36,947
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share) \| $ / shares								$ 18.32				$ 20.46
Share-based compensation expense \| $								$ 58,000			$ 60,000	$ 208,000	$ 204,000
Expected volatility												20.89%
Expected holding period (years)								9 months	6 months	3 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $								$ 215,000			174,000	$ 681,000	547,000
Stock Granted, Value, Share-based Compensation, Net of Forfeitures \| $								$ 2,200,000
Weighted aerage grant date fair value (in usd per share) \| $ / shares												$ 25.18
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								86,260
Restricted Stock \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield												1.18%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage												20.00%
Share-based compensation expense \| $								$ 238,000			335,000	$ 955,000	1,154,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period								10 years
Stock Granted, Value, Share-based Compensation, Net of Forfeitures \| $								$ 1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								212,853
Grants in period, weighted average exercise price (in dollars per share) \| $ / shares								$ 25.43
Expected volatility												27.08%
Risk-free interest rate												2.65%
Expected holding period (years)												5 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								113,320
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense \| $								$ 344,000			$ 208,000	$ 964,000	$ 465,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value \| $								$ 2,900,000
Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Annual Vesting Percentage			50.00%
Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Annual Vesting Percentage			25.00%
Amended And Restated 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Reserved (in shares)								0				0
Shares Available to Issue (in shares)								0				0
Options Outstanding (in shares)								1,435,000				1,435,000
Performance Awards Outstanding (in shares)								297,000				297,000
Cancelled shares (in shares)												289,000
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Reserved (in shares)								1,953,000				1,953,000
Shares Available to Issue (in shares)								1,405,000				1,405,000
Options Outstanding (in shares)								223,000				223,000
Performance Awards Outstanding (in shares)								229,000				229,000