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Stockholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
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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 |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Number of shares under non-option equity instrument agreements that were either cancelled or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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