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Fair Value Measurements, Measured On A Recurring And Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired loans, estimated selling cost	$ 238	$ 163
Recurring [Member]
Assets [Abstract]
Equity securities in financial institutions	188	91
Available for sale securities [Abstract]
U.S. Agency Securities	99,186	98,887
U.S. Treasury securities	33,112	28,604
Obligations of state and political subdivisions	71,532	79,090
Corporate obligations	3,050	3,083
Mortgage-backed securities in government sponsored entities	44,460	45,027
Equity securities in financial institutions	188	91
Recurring [Member] | Level I [Member]
Assets [Abstract]
Equity securities in financial institutions	188	91
Available for sale securities [Abstract]
U.S. Agency Securities	0	0
U.S. Treasury securities	33,112	28,604
Obligations of state and political subdivisions	0	0
Corporate obligations	0	0
Mortgage-backed securities in government sponsored entities	0	0
Equity securities in financial institutions	188	91
Recurring [Member] | Level II [Member]
Assets [Abstract]
Equity securities in financial institutions	0	0
Available for sale securities [Abstract]
U.S. Agency Securities	99,186	98,887
U.S. Treasury securities	0	0
Obligations of state and political subdivisions	71,532	79,090
Corporate obligations	3,050	3,083
Mortgage-backed securities in government sponsored entities	44,460	45,027
Equity securities in financial institutions	0	0
Recurring [Member] | Level III [Member]
Assets [Abstract]
Equity securities in financial institutions	0	0
Available for sale securities [Abstract]
U.S. Agency Securities	0	0
U.S. Treasury securities	0	0
Obligations of state and political subdivisions	0	0
Corporate obligations	0	0
Mortgage-backed securities in government sponsored entities	0	0
Equity securities in financial institutions	0	0
Nonrecurring [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	2,425	1,569
Other real estate owned	844	1,024
Nonrecurring [Member] | Level I [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	0	0
Other real estate owned	0	0
Nonrecurring [Member] | Level II [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	0	0
Other real estate owned	0	0
Nonrecurring [Member] | Level III [Member]
Fair value assets and liabilities measured on non-recurring basis [Abstract]
Impaired Loans	2,425	1,569
Other real estate owned	$ 844	$ 1,024

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents corporate obligations issued debt securities.

+ References

No definition available.

+ Details

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents equity securities in financial institutions as of the balance sheet date when have been categorized as available-for-sale.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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X

- Definition

Refers to the estimated selling cost of impaired loans excluded from calculation of fair value.

+ References

No definition available.

+ Details

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents mortgage backed securities in government sponsored entities as of the balance sheet date when have been categorized as available-for-sale.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents bonds or similar securities issued by state, city, province, or local governments or their agencies in either the United States or a foreign country. Debt securities issued by state governments or provinces may include bond issuances of US state or foreign authorities. Debt securities issued by political subdivisions or US states may include debt issuances by county, borough, city, or municipal governments.

+ References

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents U.S. agency issued debt securities.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents U.S. treasury issued debt securities.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- References

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- References

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524

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