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

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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