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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Number of Loans Modified and Their Pre-Modification and Post-Modification Investment Balances (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Contract	Mar. 31, 2014 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2	0us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre- Modification Recorded Investment	$ 59us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2	$ 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post Modification Recorded Investment	59us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2	0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Residential mortgage | First lien
Financing Receivable, Modifications [Line Items]
Number of Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Pre- Modification Recorded Investment	59us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember
Post Modification Recorded Investment	$ 59us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember	$ 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = orrf_FirstLienMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialPortfolioSegmentMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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