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Postretirement Benefit Plans (Expected Benefit Payments) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Defined Benefit Postretirement Health And Life Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
1/1/2019 to 12/31/2019		$ 60,000
1/1/2020 to 12/31/2020		50,000
1/1/2021 to 12/31/2021		34,000
1/1/2022 to 12/31/2022		38,000
1/1/2023 to 12/31/2023		31,000
1/1/2024 to 12/31/2028		160,000
Defined contribution plan, employer discretionary contribution amount	$ 73,000
Director's Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
1/1/2019 to 12/31/2019		95,000
1/1/2020 to 12/31/2020		97,000
1/1/2021 to 12/31/2021		108,000
1/1/2022 to 12/31/2022		107,000
1/1/2023 to 12/31/2023		106,000
1/1/2024 to 12/31/2028		376,000
Defined contribution plan, employer discretionary contribution amount	94,000
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
1/1/2019 to 12/31/2019		92,000
1/1/2020 to 12/31/2020		115,000
1/1/2021 to 12/31/2021		144,000
1/1/2022 to 12/31/2022		160,000
1/1/2023 to 12/31/2023		162,000
1/1/2024 to 12/31/2028		$ 1,714,000
Defined contribution plan, employer discretionary contribution amount	$ 600,000

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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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- Definition

Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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- Definition

Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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-Subparagraph (f)
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Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of benefits for defined benefit plan expected to be paid in second fiscal year following latest fiscal year.

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-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 1
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Amount of discretionary contributions made by an employer to a defined contribution plan.

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