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

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

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

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

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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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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

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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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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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Amount of stock repurchase plan authorized.

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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands								3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 01, 2018	May 16, 2018	May 15, 2018	Mar. 01, 2018	Jun. 01, 2017	Mar. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.01							$ 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
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value	$ 29		$ 25
Shares Reserved (in shares)	1,844,000							1,844,000		1,844,000
Shares Available to Issue (in shares)	1,306,000							1,306,000		1,306,000
Payments of Ordinary Dividends, Common Stock										$ 2,640	$ 1,668
Options Outstanding (in shares)	1,751,000							1,751,000		1,751,000
Performance Awards Outstanding (in shares)	526,000							526,000		526,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	1,200		978
Unrecognized share based compensation, expected term (in Duration)										2 years 4 months 12 days
Directors compensation expense								$ 118	$ 90	$ 202	$ 180
Stock repurchase program, authorized amount	$ 26,000							$ 26,000		$ 26,000
Dividends declared per common share (in dollars per Share)		$ 0.075			$ 0.075	$ 0.05	$ 0.05	$ 0.075	$ 0.05	$ 0.150	$ 0.100
Dividends		$ 1,433			$ 1,207	$ 835	$ 833
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								1.61%	1.44%
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage	200.00%							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)								10,503		24,441
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share)								$ 20.87		$ 21.55
Share-based compensation expense								$ 53	$ 48	$ 150	$ 144
Expected volatility										20.89%
Expected holding period (years)								6 months	3 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense								$ 220	$ 183	$ 465	372
Stock Granted, Value, Share-based Compensation, Net of Forfeitures								2,000
Unrecognized share based compensation	$ 2,400							$ 2,400		$ 2,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								77,260
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								$ 200	300	$ 700	800
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
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)								$ 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	$ 202	$ 620	$ 257
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value								$ 2,900
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		0
Shares Available to Issue (in shares)	0							0		0
Options Outstanding (in shares)	1,528,000							1,528,000		1,528,000
Performance Awards Outstanding (in shares)	297,000							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)	1,844,000							1,844,000		1,844,000
Shares Available to Issue (in shares)	1,306,000							1,306,000		1,306,000
Options Outstanding (in shares)	223,000							223,000		223,000
Performance Awards Outstanding (in shares)	229,000							229,000		229,000