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Note 2 - Fair Value of Financial Instruments - Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Securities held to maturity	$ 17,538	$ 18,079
Reported Value Measurement [Member]
Cash and cash equivalents	65,119	74,573
Certificates of deposit in financial institutions	2,310	1,820
Securities available for sale	104,877	101,125
Securities held to maturity	17,219	17,581
Restricted investments in bank stocks	7,506	7,506
Loans, net	774,062	761,820
Accrued interest receivable	2,862	2,503
Deposits	852,895	856,724
Other borrowed funds	40,514	35,949
Subordinated debentures	8,500	8,500
Accrued interest payable	1,128	792
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	65,119	74,573
Certificates of deposit in financial institutions	2,310	1,820
Securities available for sale	104,877	101,125
Securities held to maturity	17,538	18,079
Restricted investments in bank stocks
Loans, net	771,705	760,746
Accrued interest receivable	2,862	2,503
Deposits	851,183	855,923
Other borrowed funds	38,207	34,810
Subordinated debentures	6,606	6,678
Accrued interest payable	1,128	792
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	65,119	74,573
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity
Restricted investments in bank stocks
Loans, net
Accrued interest receivable
Deposits	232,575	253,655
Other borrowed funds
Subordinated debentures
Accrued interest payable	3	4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Certificates of deposit in financial institutions	2,310	1,820
Securities available for sale	104,877	101,125
Securities held to maturity	8,697	9,020
Restricted investments in bank stocks
Loans, net
Accrued interest receivable	389	268
Deposits	618,608	602,268
Other borrowed funds	38,207	34,810
Subordinated debentures	6,606	6,678
Accrued interest payable	1,125	788
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity	8,841	9,059
Restricted investments in bank stocks
Loans, net	771,705	760,746
Accrued interest receivable	2,473	2,235
Deposits
Other borrowed funds
Subordinated debentures
Accrued interest payable

X

- Definition

Fair value portion of a savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

No definition available.

+ Details

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Namespace Prefix:	ovbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of Federal Home Loan Bank and Federal Reserve Bank Stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	ovbc_
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X

- Definition

Fair value portion of interest payable on debt, including, but not limited to, trade payables.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of of interest earned but not received.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of other miscellaneous borrowings owed by the reporting entity.

+ References

No definition available.

+ Details

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X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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X

- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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