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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The number of options outstanding and unvested as of the end of the period.

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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, Equity Instruments Other Than Options, Granted In Period, 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 paid during the period for each share of common stock outstanding.

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

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

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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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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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No definition available.

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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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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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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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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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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Feb. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	1,559,000			1,559,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,529,000			1,529,000
Payments of Ordinary Dividends, Common Stock				$ 1,668	$ 831
Share based compensation awards, options outstanding at period end (in Shares)	1,983,000			1,983,000
Unrecognized share based compensation, expected term (in Duration)				1 year 10 months 24 days
Directors compensation expense	$ 90		$ 82	$ 180	$ 212
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						25,000,000.0
Common Stock, Dividends, Per Share, Declared	$ 0.050		$ 0.025	$ 0.100	$ 0.050
Dividends, Common Stock, Cash	$ 800		$ 400	$ 1,700	$ 800
Common Stock, Dividends, Per Share, Cash Paid			$ 0.025
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.65%		0.53%
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield assumption (in Percent)				0.75%
Shares purchased through Employee Stock Purchase Plan (in Shares)	9,425
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share)	$ 22.92
Share-based compensation expense	$ 48		$ 67	$ 144
Expected volatility assumption (in Percent)				18.82%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 months		3 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 200		$ 300	$ 400	600
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	100		$ 600
Unrecognized share based compensation	$ 1,400			$ 1,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	5,000		22,250
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	5 years		3 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield assumption (in Percent)	0.74%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				20.00%
Share based compensation awards, options outstanding at period end (in Shares)	1,983,016			1,983,016
Share based compensation awards, options outstanding and unvested at period end (in Shares)	715,739			715,739
Share-based compensation expense	$ 300		$ 600	$ 800	1,100
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years	10 years
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	$ 100	$ 3,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	16,250	445,450
Grants in period, weighted average exercise price (in dollars per share)	$ 26.89	$ 26.54
Expected volatility assumption (in Percent)	29.08%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.79%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years
Fair value assumptions, exercise price (in dollars per share)	$ 7.11			$ 7.11
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	4,500	101,040
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense	$ 202		$ 81	$ 257	$ 108
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value	$ 100	$ 2,700
Amended And Restated 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	0			0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	0			0
Share based compensation awards, options outstanding at period end (in Shares)	1,967,000			1,967,000
Cancelled shares (in shares)				6,200
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance	1,559,000			1,559,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,529,000			1,529,000
Share based compensation awards, options outstanding at period end (in Shares)	16,000			16,000