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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Note | Dec. 31, 2013 Note | Dec. 31, 2012 Note
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Maximum percentage of loan-to-value ratio upon loan origination | 80.00%orrf_MaximumPercentageOfLoanToValueRatioUponLoanOrigination |  |
Maximum percentage of loan-to-value ratios of the value of the real estate taken as collateral | 90.00%orrf_MaximumPercentageOfLoanToValueRatioOfValueOfRealEstateTakenAsCollateral |  |
Maximum percentage of credit worthiness of the borrower | 43.00%orrf_MaximumPercentageOfCreditWorthinessOfBorrower |  |
Minimum amount of loan on which reviews have been made annually | $ 1,000,000 orrf_MinimumAmountOfLoanOnWhichReviewHaveBeenMadeAnnually |  |
Minimum amount of loan rated as Substandard | 250,000 orrf_MinimumAmountOfLoanRatedAsSubstandard |  |
Number of notes split | 2 orrf_NumberOfNotesSplit |  |
Minimum amount on which annual updated appraisals for criticized loans is required | 250,000 orrf_MinimumAmountOnWhichAnnualUpdatedAppraisalsForCriticizedLoansIsRequired |  |
Percentage of strong loan-to-value (or lower) | 70.00%orrf_PercentageOfStrongLoanToValue |  |
Number of notes sold | 6 orrf_NumberOfNotesSold | 8 orrf_NumberOfNotesSold | 240 orrf_NumberOfNotesSold
Aggregate carrying value of notes | 5,407,000 orrf_NotesReceivableCarryingAmount | 2,576,000 orrf_NotesReceivableCarryingAmount | 73,820,000 orrf_NotesReceivableCarryingAmount
Cash received from notes | 5,743,000 us-gaap_ProceedsFromSaleOfLoansReceivable | 2,439,000 us-gaap_ProceedsFromSaleOfLoansReceivable | 51,753,000 us-gaap_ProceedsFromSaleOfLoansReceivable
Charge off to the allowance for loan losses | $ (336,000)us-gaap_AllowanceForLoanAndLeaseLossesLoansSold | $ 137,000 us-gaap_AllowanceForLoanAndLeaseLossesLoansSold | $ 22,067,000 us-gaap_AllowanceForLoanAndLeaseLossesLoansSold
Minimum [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Rating on loans that are deemed impaired | 90 days |  |
Historical loss percentage adjustment to anticipated loss allocation | (1.50%)orrf_ValuationAllowancesandReservesAssumptionsLossPercentageHistorical / us-gaap_RangeAxis = us-gaap_MinimumMember | (1.50%)orrf_ValuationAllowancesandReservesAssumptionsLossPercentageHistorical / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Historical loss percentage adjustment to anticipated loss allocation | 1.50%orrf_ValuationAllowancesandReservesAssumptionsLossPercentageHistorical / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.50%orrf_ValuationAllowancesandReservesAssumptionsLossPercentageHistorical / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Maximum Percentage of credit worthiness of the borrower. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of loan to value ratio of value of real estate taken as collateral. + References No definition available. + Details
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Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of loan to value ratio upon loan origination. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Minimum amount of loan on which review have been made annually. + References No definition available. + Details
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Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Minimum amount of loan rated as substandard. + References No definition available. + Details
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Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Minimum amount on which annual updated appraisals for criticized loans is required. + References No definition available. + Details
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Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes receivable carrying amount. + References No definition available. + Details
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Namespace Prefix: | orrf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum number of days of past due assigned as substandard rating. + References No definition available. + Details
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Namespace Prefix: | orrf_
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Period Type: | duration

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- Definition Number of notes sold. + References No definition available. + Details
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- Definition Number of notes split. + References No definition available. + Details
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- Definition Percentage of strong loan to value. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Valuation Allowances and Reserves, Assumptions, Loss Percentage, Historical + References No definition available. + Details
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Namespace Prefix: | orrf_
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- Definition Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 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 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Details
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- Definition The cash inflow associated with the sale of loans receivables arising from the financing of goods and services. + 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 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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