LOANS AND ALLOWANCE FOR CREDIT LOSSES - Amortized Cost of Nonaccrual Loans By Class, With And Without Loan Reserves (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	$ 7	$ 71
Nonaccrual loans with no related ACL	12,879	25,456
Loans Past Due 90+ Accruing	99	66
Total nonaccrual loans	12,886	25,527
Commercial real estate \| Owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	3,925	15,786
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	3,925	15,786
Commercial real estate \| Non-owner occupied
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	228	240
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	228	240
Commercial real estate \| Multi-family
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	1,233	1,233
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	1,233	1,233
Commercial real estate \| Non-owner occupied residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	2,016	2,572
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	2,016	2,572
Acquisition and development \| Commercial and land development
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	1,306	1,361
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	1,306	1,361
Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	68
Nonaccrual loans with no related ACL	1	604
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	1	672
Residential mortgage \| First lien
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	2,621	2,309
Loans Past Due 90+ Accruing	24	66
Total nonaccrual loans	2,621	2,309
Residential mortgage \| Home equity - term
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	2	3
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	2	3
Residential mortgage \| Home equity - lines of credit
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	0	0
Nonaccrual loans with no related ACL	1,526	1,312
Loans Past Due 90+ Accruing	75	0
Total nonaccrual loans	1,526	1,312
Installment and other loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans with a related ACL	7	3
Nonaccrual loans with no related ACL	21	36
Loans Past Due 90+ Accruing	0	0
Total nonaccrual loans	$ 28	$ 39

Financing Receivable Excluding Accrued Interest Nonaccrual, With Allowance

No definition available.

Name:	orrf_FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowance
Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualStatusLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=orrf_OwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=orrf_NonOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=orrf_NonOwnerOccupiedResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=orrf_AcquisitionAndDevelopmentPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=orrf_CommercialAndLandDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=orrf_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=orrf_FirstLienMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=orrf_HomeEquityTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=orrf_InstallmentandOtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: