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

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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

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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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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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Stockholders' Equity (Narrative) (Details) - USD ($)	3 Months Ended				9 Months Ended
Stockholders' Equity (Narrative) (Details) - USD ($)	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Feb. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Reserved (in shares)	1,571,000				1,571,000
Shares Available to Issue (in shares)	1,541,000				1,541,000
Payments of Ordinary Dividends, Common Stock					$ 2,503,000	$ 1,662,000
Options Outstanding (in shares)	1,945,000				1,945,000
Performance Awards Outstanding (in shares)	328,000				328,000
Unrecognized share based compensation, expected term (in Duration)					1 year 8 months 24 days
Directors compensation expense	$ 900,000			$ 90,000	$ 271,000	$ 302,000
Stock repurchase program, authorized amount							$ 25,000,000.0
Treasury stock (in shares)	574,054
Treasury stock acquired (in dollars per share)	$ 24.35
Treasury stock, value	$ 14,000,000
Dividends declared per common share (in dollars per Share)	$ 0.05			$ 0.050	$ 0.150	$ 0.100
Dividends	$ 800,000			$ 800,000	$ 2,500,000	$ 1,700,000
Dividends (in dollars per share)				$ 0.05
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	0.77%	0.65%		0.53%
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]
Expected dividend yield assumption (in Percent)					0.82%
Shares purchased through Employee Stock Purchase Plan (in Shares)	11,525
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share)	$ 21.76
Share-based compensation expense	$ 60,000			$ 53,000	$ 204,000	197,000
Expected volatility assumption (in Percent)					18.82%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	9 months	6 months		3 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 174,000			$ (21,000)	$ 500,000	$ 500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period						50,000
Stock Granted, Value, Share-based Compensation, Net of Forfeitures	100,000			$ 600,000
Unrecognized share based compensation	$ 1,300,000				$ 1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	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]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					20.00%
Options Outstanding (in shares)	1,945,656				1,945,656
Share based compensation awards, options outstanding and unvested at period end (in Shares)	708,379				708,379
Share-based compensation expense	$ 300,000			$ 200,000	$ 1,200,000	$ 1,400,000
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	$ 100,000		$ 3,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	16,250	445,450
Grants in period, weighted average exercise price (in dollars per share)		$ 26.89	$ 26.54
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	0	4,500	101,040
Officers And Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors compensation expense	$ 208,000			$ 46,000	$ 465,000	$ 154,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value	$ 100,000		$ 2,700,000
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)	1,929,000				1,929,000
Performance Awards Outstanding (in shares)	319,000				319,000
Cancelled shares (in shares)					17,500
2017 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Reserved (in shares)	1,571,000				1,571,000
Shares Available to Issue (in shares)	1,541,000				1,541,000
Options Outstanding (in shares)	16,000				16,000
Performance Awards Outstanding (in shares)	9,000				9,000