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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) (USD $) | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Maximum percentage of loan-to-value ratio upon loan origination | 80.00% |
Maximum percentage of loan-to-value ratios of the value of the real estate taken as collateral | 90.00% |
Maximum percentage of credit worthiness of the borrower | 43.00% |
Minimum amount of loan on which reviews have been made annually | $ 1,000,000 |
Minimum amount of loan rated as Substandard | 250,000 |
Number of notes split | 2 |
Minimum amount on which annual updated appraisals for criticized loans is required | $ 250,000 |
Percentage of strong loan-to-value | 70.00% |
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%) | (1.50%)
Maximum [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Historical loss percentage adjustment to anticipated loss allocation | 1.50% | 1.50%

X
- Definition Maximum Percentage of credit worthiness of the borrower. + References No definition available. + Details
Name: | orrf_MaximumPercentageOfCreditWorthinessOfBorrower
Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Maximum percentage of loan to value ratio upon loan origination. + References No definition available. + Details
Name: | orrf_MaximumPercentageOfLoanToValueRatioUponLoanOrigination
Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Definition Minimum amount on which annual updated appraisals for criticized loans is required. + References No definition available. + Details
Name: | orrf_MinimumAmountOnWhichAnnualUpdatedAppraisalsForCriticizedLoansIsRequired
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
Name: | orrf_NumberOfDaysOfPastDueAssignedAsSubstandardRating
Namespace Prefix: | orrf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of notes split. + References No definition available. + Details
Name: | orrf_NumberOfNotesSplit
Namespace Prefix: | orrf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of strong loan to value. + References No definition available. + Details
Name: | orrf_PercentageOfStrongLoanToValue
Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Valuation Allowances and Reserves, Assumptions, Loss Percentage, Historical + References No definition available. + Details
Name: | orrf_ValuationAllowancesandReservesAssumptionsLossPercentageHistorical
Namespace Prefix: | orrf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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