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Postretirement Benefit Plans (Expected Benefit Payments) (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Defined Benefit Postretirement Health And Life Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
1/1/2020 to 12/31/2020	$ 51,000
1/1/2021 to 12/31/2021	36,000
1/1/2022 to 12/31/2022	38,000
1/1/2023 to 12/31/2023	34,000
1/1/2024 to 12/31/2024	30,000
1/1/2025 to 12/31/2029	142,000
Defined contribution plan, employer discretionary contribution amount	51,000
Director's Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
1/1/2020 to 12/31/2020	92,000
1/1/2021 to 12/31/2021	102,000
1/1/2022 to 12/31/2022	102,000
1/1/2023 to 12/31/2023	101,000
1/1/2024 to 12/31/2024	82,000
1/1/2025 to 12/31/2029	345,000
Defined contribution plan, employer discretionary contribution amount	92,000
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
1/1/2020 to 12/31/2020	110,000
1/1/2021 to 12/31/2021	126,000
1/1/2022 to 12/31/2022	142,000
1/1/2023 to 12/31/2023	144,000
1/1/2024 to 12/31/2024	265,000
1/1/2025 to 12/31/2029	1,716,000
Defined contribution plan, employer discretionary contribution amount	$ 200,000

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth 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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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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-Section 50
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-SubTopic 20
-Section 50
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Amount of discretionary contributions made by an employer to a defined contribution plan.

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