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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014 Note SecurityLoan	Mar. 31, 2013 SecurityLoan
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%
Maximum period for temporary reduction in interest rates	12 months
Number of loans that modified as trouble debt restructurings for which there was a payment default	0	0
Number of loans modified and considered troubled debt restructurings	0	0
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Rating on loans that are deemed impaired	90 days

X

- Definition

Maximum Percentage of credit worthiness of the borrower.

+ References

No definition available.

+ Details

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X

- 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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Period Type:	duration

X

- Definition

Maximum percentage of loan to value ratio upon loan origination.

+ References

No definition available.

+ Details

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Namespace Prefix:	orrf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum period for temporary reduction in interest rates.

+ References

No definition available.

+ Details

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Namespace Prefix:	orrf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

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_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of notes split.

+ References

No definition available.

+ Details

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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

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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=28368275&loc=SL6953676-111524

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X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524

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