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Note B - Business Combinations (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 05, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Combination, Acquisition Related Costs |  | $ 930 |  |
Assets | $ 950,000 | 954,640 | 796,285 | $ 778,668
Number of Branches | 25 |  |  |
Goodwill |  | $ 7,801 | $ 1,267 |
Milton Bancorp, Inc [Member] |  |  |  |
Business Combination, Number of Common Shares of the Acquiring Entity into Which Common Shares of the Acquired Entity May Be Converted | 1,636 |  |  |
Business Acquisition, Cash Which May Be Paid for the Stock of Acquired Entity | $ 37,219 |  |  |
Business Combination, Exchange of Acquired Entity's Common Shares for Cash or Common Shares of Acquiring Entity, Common Shares Reallocation Percentage | 80.00% |  |  |
Business Acquisition, Number of Issued and Outstanding Common Shares of Acquired Entity | 400 |  |  |
Business Combination, Exchange of Acquired Entity's Common Shares for Cash or Common Shares of Acquiring Entity, Cash Reallocation Percentage | 20.00% |  |  |
Business Combination, Number of Acquired Entity Preferred Shares Converted to Receive Cash Payment | 1,237 |  |  |
Business Combination, Cash Payment from Conversion of Acquired Preferred Shares | $ 3,600 |  |  |
Business Combination, Consideration Transferred | $ 18,875 |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 11,444 |  |  |
Payments to Acquire Businesses, Gross | 7,431 |  |  |
Payments to Acquire Businesses, Portion Financed in Borrowed Funds | 5,000 |  |  |
Business Combination, Acquisition Related Costs | 930 |  |  |
Goodwill | 6,534 |  |  |
Business Combination, Acquired Receivables, Fair Value | 111,558 |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount | $ 112,249 |  |  |
Business Combination, Number of Common Shares of the Acquiring Entity into Which Common Shares of the Acquired Entity May Be Converted, Par Value | 0 |  |  |

X
- Definition Represents the per share cash payment from the conversion of acquired common shares in a business combination. + References No definition available. + Details
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Namespace Prefix: | ovbc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of issued and outstanding common shares of the acquired entity in a business combination. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the per share cash payment from the conversion of acquired preferred shares in a business combination. + References No definition available. + Details
Name: | ovbc_BusinessCombinationCashPaymentFromConversionOfAcquiredPreferredShares
Namespace Prefix: | ovbc_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the cash to be paid by the acquiring entity to each common shareholder of the acquired entity, expressed as a percentage of the total consideration to be paid to each common shareholder of the acquired entity. + References No definition available. + Details
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- Definition Represents the acquiring entity's common shares to be paid by the acquiring entity, expressed as a percentage of the total consideration to be paid to each common shareholder of the acquired entity. + References No definition available. + Details
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X
- Definition Represents the number of acquired entity preferred shares that are converted into the right to receive cash payments from the acquiring entity in a business combination. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of common shares of the acquiring entity into which common shares of the acquired entity may be converted. + References No definition available. + Details
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X
- Definition Represents the par value of common shares of the acquiring entity into which common shares of the acquired entity may be converted. + References No definition available. + Details
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Namespace Prefix: | ovbc_
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Balance Type: | na
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X
- Definition The number of operating branches. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents a portion of the cash outflow financed in borrowed funds to acquire the business during the period. The cash portion only of the acquisition price. + References No definition available. + Details
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Balance Type: | credit
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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X
- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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