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Note 16 - Segment Information (Details) - Segment Reporting (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 8,303 us-gaap_InterestIncomeExpenseNet |  | $ 8,208 us-gaap_InterestIncomeExpenseNet |  | $ 8,187 us-gaap_InterestIncomeExpenseNet |  | $ 8,782 us-gaap_InterestIncomeExpenseNet |  | $ 8,193 us-gaap_InterestIncomeExpenseNet |  | $ 7,930 us-gaap_InterestIncomeExpenseNet |  | $ 7,841 us-gaap_InterestIncomeExpenseNet |  | $ 8,421 us-gaap_InterestIncomeExpenseNet |  | $ 7,823 us-gaap_InterestIncomeExpenseNet |  | $ 7,867 us-gaap_InterestIncomeExpenseNet |  | $ 8,053 us-gaap_InterestIncomeExpenseNet |  | $ 8,912 us-gaap_InterestIncomeExpenseNet |  | $ 33,480 us-gaap_InterestIncomeExpenseNet | $ 32,385 us-gaap_InterestIncomeExpenseNet | $ 32,655 us-gaap_InterestIncomeExpenseNet
Provision expense | 1,589 us-gaap_ProvisionForLoanAndLeaseLosses | [1] | (682)us-gaap_ProvisionForLoanAndLeaseLosses | [1] | 1,386 us-gaap_ProvisionForLoanAndLeaseLosses | [1] | 494 us-gaap_ProvisionForLoanAndLeaseLosses | [1] | (198)us-gaap_ProvisionForLoanAndLeaseLosses | [2] | 833 us-gaap_ProvisionForLoanAndLeaseLosses | [2] | (189)us-gaap_ProvisionForLoanAndLeaseLosses | [2] | 31 us-gaap_ProvisionForLoanAndLeaseLosses | [2] | (1,440)us-gaap_ProvisionForLoanAndLeaseLosses | [3] | 1,183 us-gaap_ProvisionForLoanAndLeaseLosses | [3] | 524 us-gaap_ProvisionForLoanAndLeaseLosses | [3] | 1,316 us-gaap_ProvisionForLoanAndLeaseLosses | [3] | 2,787 us-gaap_ProvisionForLoanAndLeaseLosses | 477 us-gaap_ProvisionForLoanAndLeaseLosses | 1,583 us-gaap_ProvisionForLoanAndLeaseLosses
Noninterest income | 1,657 us-gaap_NoninterestIncome | [4] | 2,106 us-gaap_NoninterestIncome | [4] | 1,912 us-gaap_NoninterestIncome | [4] | 4,118 us-gaap_NoninterestIncome | [4] | 1,039 us-gaap_NoninterestIncome | [4] | 1,574 us-gaap_NoninterestIncome | [4] | 1,965 us-gaap_NoninterestIncome | [4] | 3,940 us-gaap_NoninterestIncome | [4] | 1,356 us-gaap_NoninterestIncome | [4] | 1,674 us-gaap_NoninterestIncome | [4] | 1,974 us-gaap_NoninterestIncome | [4] | 3,479 us-gaap_NoninterestIncome | [4] | 9,793 us-gaap_NoninterestIncome | 8,518 us-gaap_NoninterestIncome | 8,483 us-gaap_NoninterestIncome
Noninterest expense | 7,757 us-gaap_NoninterestExpense |  | 7,244 us-gaap_NoninterestExpense |  | 6,997 us-gaap_NoninterestExpense |  | 7,295 us-gaap_NoninterestExpense |  | 6,790 us-gaap_NoninterestExpense |  | 7,320 us-gaap_NoninterestExpense |  | 7,317 us-gaap_NoninterestExpense |  | 7,948 us-gaap_NoninterestExpense |  | 8,290 us-gaap_NoninterestExpense |  | 6,957 us-gaap_NoninterestExpense |  | 7,162 us-gaap_NoninterestExpense |  | 7,332 us-gaap_NoninterestExpense |  | 29,293 us-gaap_NoninterestExpense | 29,375 us-gaap_NoninterestExpense | 29,741 us-gaap_NoninterestExpense
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,120 us-gaap_IncomeTaxExpenseBenefit | 2,939 us-gaap_IncomeTaxExpenseBenefit | 2,762 us-gaap_IncomeTaxExpenseBenefit
Net income | 423 us-gaap_NetIncomeLoss |  | 2,742 us-gaap_NetIncomeLoss |  | 1,344 us-gaap_NetIncomeLoss |  | 3,564 us-gaap_NetIncomeLoss |  | 1,886 us-gaap_NetIncomeLoss |  | 1,061 us-gaap_NetIncomeLoss |  | 1,942 us-gaap_NetIncomeLoss |  | 3,223 us-gaap_NetIncomeLoss |  | 1,604 us-gaap_NetIncomeLoss |  | 1,107 us-gaap_NetIncomeLoss |  | 1,719 us-gaap_NetIncomeLoss |  | 2,622 us-gaap_NetIncomeLoss |  | 8,073 us-gaap_NetIncomeLoss | 8,112 us-gaap_NetIncomeLoss | 7,052 us-gaap_NetIncomeLoss
Assets | 778,668 us-gaap_Assets |  |  |  |  |  |  |  | 747,368 us-gaap_Assets |  |  |  |  |  |  |  | 769,223 us-gaap_Assets |  |  |  |  |  |  |  | 778,668 us-gaap_Assets | 747,368 us-gaap_Assets | 769,223 us-gaap_Assets
Banking [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,172 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 29,141 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 29,445 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Provision expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,645 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 364 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 1,527 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Noninterest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,897 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 7,711 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 7,734 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Noninterest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,806 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 26,914 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 27,384 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,587 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 2,440 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 2,240 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,031 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 7,134 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 6,028 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Assets | 764,510 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember |  |  |  |  |  |  |  | 732,905 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember |  |  |  |  |  |  |  | 754,490 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember |  |  |  |  |  |  |  | 764,510 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 732,905 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember | 754,490 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_BankingMember
Consumer Finance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,308 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 3,244 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 3,210 us-gaap_InterestIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
Provision expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 113 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 56 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
Noninterest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 896 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 807 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 749 us-gaap_NoninterestIncome / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
Noninterest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,487 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 2,461 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 2,357 us-gaap_NoninterestExpense / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 533 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 499 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 522 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,042 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 978 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | 1,024 us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
Assets | $ 14,158 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember |  |  |  |  |  |  |  | $ 14,463 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember |  |  |  |  |  |  |  | $ 14,733 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember |  |  |  |  |  |  |  | $ 14,158 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | $ 14,463 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember | $ 14,733 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ovbc_ConsumerFinanceMember
[1] | During the third quarter of 2014, the Company experienced negative provision expense that was primarily related to a decrease in specific allocations impacted by the improvement in collateral values of an impaired commercial real estate loan relationship. A re-appraisal of the commercial properties securing the loan identified asset appreciation, which resulted in a $524 reduction to the specific allocation related to the loan.
[2] | During most of 2013, the Company experienced minimal to negative provision expense as a result of lower general allocations of the allowance for loan losses.General allocations were impacted by improved economic trends that include: decreasing historical loan loss factor, lower delinquencies and lower classified/criticized assets.
[3] | During the fourth quarter of 2012, the Company experienced a large recovery of $1,250 on a previously charged-off commercial loan which lowered net charge-offs.The large decrease in net charge-offs contributed to a lower historical loan loss factor that created a lower level of general allocations within the allowance for loanlosses.
[4] | The Company's noninterest income was significantly impacted by seasonal tax refund processing fees. The Bank serves as a facilitator for the clearing of taxrefunds for a single tax refund product provider. The Bank processes electronic refund checks/deposits associated with taxpayer refunds, and will, in turn, receive a fee paid by the third-party tax refund product provider for each transaction processed. Due to the seasonal nature of tax refund transactions, the majority of income was recorded during the first quarter.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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