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Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Nov. 30, 2009	Jun. 30, 2018	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2017
Variable Interest Entity [Line Items]
Long-term Debt		$ 100,929			$ 120,929
Payments to Acquire Businesses and Interest in Affiliates			$ 6,100	$ 6,100
VIE purpose		purchase the land and construct a 36-unit low income housing rental complex
Federal investment tax credits			$ 8,400
Change in federal investment tax credits		$ (400)
Federal investment tax credit duration			10 years
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Long-term Debt		30,900
Equity Method Investments		900
Ownership in Liberty Mews Limited Partnership	99.99%
VIE financing				10,600
Construction and Development Costs				$ 10,600
Partnership total assets		$ 8,400			$ 8,600

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Represents the change in the amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits.

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Federal investment tax credit duration

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- Definition

The aggregate costs related to construction and development services during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
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The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support.

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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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Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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The overall reason that the Variable Interest Entity (VIE) was formed. For example, the VIE was formed to hold financial assets, including loans or receivables, real estate or other property or to engage in research and development or other activities on behalf of another company.

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