Derivative Financial Instruments - Financial Instruments (Details) - Cash flow hedge	Dec. 31, 2018 USD ($) derivative
Interest-rate swap contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional	$ 43,000,000
Pay Rate	3.82%
Fair value of interest rate hedge, liabilities	$ (1,310,000)
Interest rate swap, entered in July 2005, maturity in July 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest-rate swap contracts (in derivatives) \| derivative	3

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Fixed interest rate related to the interest rate derivative.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

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Number of interest rate derivative instruments held by the entity at the reporting date.

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