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- Definition

Defined Benefit Plan, Annual Vesting Percentage

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- Definition

Defined Benefit Plan, Benefit Obligation, Percent Of Average Executive Base Salary

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No definition available.

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- Definition

Defined Benefit Plan, Benefit Obligation, Percent Of Average Executive Base Salary, Adjustment Thereafter

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- Definition

Defined Benefit Plan, Number of Annual Payments After Separation

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- Definition

Interest paid on deferred fees

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Exercised Forfeited Or Expired Number

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No definition available.

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- Definition

Share Based Compensation Arrangement By ShareBased Payment Award Award Expiration Period

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- Definition

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary.

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No definition available.

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- Definition

Amount of distribution made to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

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- Definition

Face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73718008&loc=d3e42732-111610

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- Definition

Period expense related to postemployment benefits.

+ References

No definition available.

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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.

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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

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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.

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No definition available.

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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
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

Percentage of vesting of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Employee Benefit Plans - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
Employee Benefit Plans - Narrative (Details)	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) installment shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, outstanding (in shares) \| shares	534,033		534,033		504,573
Defined contribution plan employer discretionary contribution amount	$ 176,000	$ 138,000	$ 312,000	$ 257,000
Deferred fees	9,000	6,000	260,000	126,000
Interest paid on deferred fees	17,000	12,000	32,000	21,000
Distributions paid	3,000		7,000		$ 0
Defined benefit plans future payments	$ 1,424,000	1,095,000	$ 1,424,000	1,095,000	$ 1,187,000	$ 1,023,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage			100.00%
Executive Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage			100.00%
Supplemental Employee Retirement Plan \| President And Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service	40.00%		40.00%
Retirement benefit payable as percent of average Executive's base salary for 36 months preceding separation from service, adjustment thereafter	2.00%		2.00%
Number of annual payments after separation \| installment			15
Defined benefit plans future payments	$ 3,300,000		$ 3,300,000
Discount rate used to calculate the present value of the benefit obligation	4.00%		4.00%
Vesting percentage			3.00%
Award vesting rights, percentage			100.00%
Other Postretirement Benefit Plan \| Executive Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage			7.50%
Award vesting rights, percentage			100.00%
Accrued expense under the plan	$ 44,000		$ 44,000
Life insurance plan with a post retirement death benefit	250,000		250,000
Life insurance plan aggregate expenses	$ 1,000	$ 1,000	$ 2,000	$ 3,000
Other Postretirement Benefit Plan \| Executive Management \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement guaranteed award percentage			15.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Options, award expiration period			10 years
Number of shares authorized \| shares	2,462,585		2,462,585
Options, outstanding (in shares) \| shares	534,033		534,033
Options, exercised forfeited or expired (shares) \| shares			1,653,247
Number of shares available for grant \| shares	275,305		275,305
Compensation cost not yet recognized	$ 817,000		$ 817,000
Compensation cost recognition weighted average period			2 years 2 months 12 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Number of shares authorized \| shares	518,157		518,157
Number of shares available for grant \| shares	74,728		74,728
Compensation cost recognition weighted average period			2 years 10 months 24 days
Nonvested awards, compensation not yet recognized, awards other than options	$ 1,400,000		$ 1,400,000