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Fair Value Disclosures - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Allowance for loan losses	$ 4,935,000orrf_ImpairedFinancingReceivablesAllocatedAllowance	$ 4,413,000orrf_ImpairedFinancingReceivablesAllocatedAllowance
Specific Charges To Value Real Estate Owned	551,000orrf_SpecificChargesToValueRealEstateOwned	581,000orrf_SpecificChargesToValueRealEstateOwned
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value liabilities	$ 0us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	$ 0us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

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- Definition

Impaired financing receivables allocated allowance.

+ References

No definition available.

+ Details

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- Definition

Specific charges to value the real estate owned at the lower of cost or fair value on properties.

+ References

No definition available.

+ Details

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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