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Incentive Plans Incentive Plans: Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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Dec. 31, 2017 USD ($) plan $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2017 USD ($) plan $ / shares shares | Dec. 31, 2016 USD ($) shares | Jun. 30, 2017 shares | Dec. 31, 2013 shares | Dec. 31, 2010 shares | Dec. 31, 2006 shares | Dec. 31, 2003 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of share-based compensation plans | plan | 2 |  | 2 |  |  |  |  |  |
Share-based compensation expense | $ | $ 258,000 | $ 275,000 | $ 524,000 | $ 977,000 |  |  |  |  |
Income tax benefit recognized for share-based compensation plans | $ | $ 7,000 | 8,000 | $ 20,000 | 179,000 |  |  |  |  |
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock | 10,501,839 |  | 10,501,839 |  | 10,235,313 |  |  |  |
2013 Equity Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  | 300,000 |  |  |
Annual limitation on awards granted to an individual under Equity Incentive Plan |  |  |  |  | 60,000 |  |  |  |
2013 Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  | 300,000 |  |  |
Annual limitation on awards granted to an individual under Equity Incentive Plan |  |  |  |  | 45,000 |  |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options granted, weighted average grant date fair value | $ / shares | $ 0.00 |  | $ 0.00 |  |  |  |  |  |
Stock options, Exercised | 5,750 |  | 27,250 |  |  |  |  |  |
Stock options, Granted | 0 |  | 0 |  |  |  |  |  |
Stock options, Forfeitured | 0 |  | 2,500 |  |  |  |  |  |
Unrecognized share-based compensation expense, stock options | $ | $ 700,000 | $ 1,100,000 | $ 700,000 | $ 1,100,000 |  |  |  |  |
Equity Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Term used to calculate expected volatility |  |  | 84 months |  |  |  |  |  |
Stock options, Exercised | 5,750 | 22,750 | 27,250 | 23,750 |  |  |  |  |
Stock options, Granted | 0 | 6,000 | 0 | 26,000 |  |  |  |  |
Stock options, Forfeitured | 0 | 11,250 | 2,500 | 27,250 |  |  |  |  |
Number of shares available for grant | 147,500 | 138,000 | 147,500 | 138,000 |  |  |  |  |
Share-based compensation cost not yet recognized, weighted average period for recognition (less than) | 1 year 1 month 18 days | 2 years |  |  |  |  |  |  |
Forfeiture rate for Equity Incentive Plans |  |  | 20.00% | 20.00% |  |  |  |  |
Equity Incentive Plan [Member] | Employee Stock Option [Member] | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 5 years |  |  |  |
Maximum term for stock awards |  |  |  |  | 10 years |  |  |  |
Equity Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares available for grant | 267,750 | 271,750 | 267,750 | 271,750 |  |  |  |  |
Share-based compensation cost not yet recognized, weighted average period for recognition (less than) | 1 year 3 months | 2 years 2 months |  |  |  |  |  |  |
Forfeiture rate for Equity Incentive Plans |  |  | 20.00% | 20.00% |  |  |  |  |
Restricted stock, Vesting and distribution | 0 | 0 | 0 | 87,750 |  |  |  |  |
Restricted stock, Forfeited | 0 | 8,250 | 2,000 | 15,250 |  |  |  |  |
Restricted stock, grants in period | 0 | 3,000 | 0 | 18,000 |  |  |  |  |
Unrecognized share-based compensation expense, restricted stock | $ | $ 867,000 | $ 1,300,000 | $ 867,000 | $ 1,300,000 |  |  |  |  |
Equity Incentive Plan [Member] | Restricted Stock [Member] | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 5 years |  |  |  |
2010 Equity Incentive Plan | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  |  | 586,250 |  |
Annual limitation on awards granted to an individual under Equity Incentive Plan |  |  |  |  | 117,250 |  |  |  |
2010 Equity Incentive Plan | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  |  | 288,750 |  |
Annual limitation on awards granted to an individual under Equity Incentive Plan |  |  |  |  | 43,312 |  |  |  |
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock |  |  |  |  |  | 300,000 | 288,750 |  |
2006 Equity Incentive Plan | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  |  |  | 365,000 |
Annual limitation on awards granted to an individual under Equity Incentive Plan |  |  |  |  | 73,000 |  |  |  |
2006 Equity Incentive Plan | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  |  |  | 185,000 |
Annual limitation on awards granted to an individual under Equity Incentive Plan |  |  |  |  | 27,750 |  |  |  |
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock |  |  |  |  |  |  |  | 185,000 |
Stock Option Plans [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options granted, weighted average grant date fair value | $ / shares |  |  | $ 0.00 |  |  |  |  |  |
Stock options, Exercised |  |  | 0 |  |  |  |  |  |
Stock options, Granted |  |  | 0 |  |  |  |  |  |
Stock options, Forfeitured |  |  | 50,000 |  |  |  |  |  |
Unrecognized share-based compensation expense, stock options | $ | $ 0 |  | $ 0 |  |  |  |  |  |
Stock Option Plans [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | 0 |  | 0 |  |  |  |  |  |
Term used to calculate expected volatility |  |  | 84 months |  |  |  |  |  |
Stock options, Forfeitured |  |  | 50,000 | 12,500 |  |  |  |  |
Stock Option Plans [Member] | Employee Stock Option [Member] | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |  |  |  |
Maximum term for stock awards |  |  | 10 years |  |  |  |  |  |
2003 Stock Option Plan | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for Equity Incentive Plan |  |  |  |  |  |  |  |  | 352,500
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options | 0 |  | 0 |  |  |  |  |  |

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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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