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SHORT-TERM BORROWINGS - Information Concerning Securities Sold under Agreements (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Disclosure [Abstract] |  |  |
Balance at year end | $ 21,742 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts | $ 9,032 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts | $ 9,650 us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts
Weighted average interest rate at year-end | 0.20%orrf_AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterest | 0.20%orrf_AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterest | 0.24%orrf_AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterest
Average balance during the year | 19,186 orrf_AssetsSoldUnderAgreementsToRepurchaseAverageOutstandingAmount | 13,772 orrf_AssetsSoldUnderAgreementsToRepurchaseAverageOutstandingAmount | 19,072 orrf_AssetsSoldUnderAgreementsToRepurchaseAverageOutstandingAmount
Average interest rate during the year | 0.20%orrf_AssetsSoldUnderAgreementsToRepurchaseAverageInterestRateDuringPeriod | 0.20%orrf_AssetsSoldUnderAgreementsToRepurchaseAverageInterestRateDuringPeriod | 0.38%orrf_AssetsSoldUnderAgreementsToRepurchaseAverageInterestRateDuringPeriod
Maximum month-end balance during the year | 32,861 orrf_AssetsSoldUnderAgreementsToRepurchaseMaximumMonthEndOutstandingAmount | 19,105 orrf_AssetsSoldUnderAgreementsToRepurchaseMaximumMonthEndOutstandingAmount | 33,752 orrf_AssetsSoldUnderAgreementsToRepurchaseMaximumMonthEndOutstandingAmount
Securities underlying the agreements at year-end: |  |  |
Fair value of securities underlying the agreements at year-end | $ 38,337 orrf_SecuritiesHeldUnderAgreementsToRepurchaseFairValue | $ 52,024 orrf_SecuritiesHeldUnderAgreementsToRepurchaseFairValue | $ 72,717 orrf_SecuritiesHeldUnderAgreementsToRepurchaseFairValue

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- Definition Assets sold under agreements to repurchase average interest rate during period. + References No definition available. + Details
Name: | orrf_AssetsSoldUnderAgreementsToRepurchaseAverageInterestRateDuringPeriod
Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Assets sold under agreements to repurchase average outstanding amount. + References No definition available. + Details
Name: | orrf_AssetsSoldUnderAgreementsToRepurchaseAverageOutstandingAmount
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Assets sold under agreements to repurchase maximum month end outstanding amount. + References No definition available. + Details
Name: | orrf_AssetsSoldUnderAgreementsToRepurchaseMaximumMonthEndOutstandingAmount
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Assets Sold Under Agreements To Repurchase, Weighted Average Interest + References No definition available. + Details
Name: | orrf_AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterest
Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Securities held under agreements to repurchase fair value. + References No definition available. + Details
Name: | orrf_SecuritiesHeldUnderAgreementsToRepurchaseFairValue
Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 + Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration