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Employee Benefit and Deferred Compensation Plans - (Details Textual) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2017 USD ($) point shares | Jun. 30, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Retiring age limit, minimum |  |  | 55 years |
Retiring age limit, maximum |  |  | 65 years |
Eligible employee years of service (in years) |  |  | 15 years |
Number of points for eligibility | point |  |  | 70 |
Minimum eligible age for medicare coverage |  |  | 65 years |
Life insurance coverage face value | $ |  |  | $ 5,000 |
Life insurance coverage age (until) |  |  | 70 years |
Life insurance coverage at retiree expense after age |  |  | 70 years |
Option expiration period (in years) |  |  | 10 years |
Award vesting period (in years) |  |  | 3 years |
Stock options granted (shares) | shares | 0 | 0 | 0 | 0
Treasury shares reissued (shares) | shares |  |  | 92,610 |
Total stock-based compensation expense | $ | $ 1,237,000 | $ 856,000 | $ 2,411,000 | $ 1,715,000
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award requisite service period (in years) |  |  | 1 year |

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- Definition Health care benefits eligible employee retirement age from service maximum. + References No definition available. + Details
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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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