LOANS AND ALLOWANCE FOR CREDIT LOSSES - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Activity in allowance for loan losses
Balance, beginning of period	$ 47,804	$ 29,165	$ 48,689	$ 28,702
Provision for loan losses	209	812	(345)	1,233
Charge-offs	(504)	(164)	(1,397)	(263)
Recoveries	389	51	951	192
Balance end of period	47,898	29,864	47,898	29,864
Commercial
Activity in allowance for loan losses
Balance, beginning of period	39,995	25,761	42,772	26,077
Provision for loan losses	(199)	923	(2,817)	538
Charge-offs	(312)	(49)	(929)	(95)
Recoveries	293	15	751	130
Balance end of period	39,777	26,650	39,777	26,650
Commercial \| Commercial Real Estate
Activity in allowance for loan losses
Balance, beginning of period	25,893	17,975	29,551	17,873
Provision for loan losses	377	236	(3,210)	314
Charge-offs	(111)	(12)	(186)	(12)
Recoveries	4	4	8	28
Balance end of period	26,163	18,203	26,163	18,203
Commercial \| Acquisition and Development
Activity in allowance for loan losses
Balance, beginning of period	6,150	2,233	6,601	2,241
Provision for loan losses	(566)	423	(1,018)	414
Charge-offs	0	(23)	0	(23)
Recoveries	1	1	2	2
Balance end of period	5,585	2,634	5,585	2,634
Commercial \| Agricultural
Activity in allowance for loan losses
Balance, beginning of period	163	393	110	437
Provision for loan losses	3	0	81	(44)
Charge-offs	(6)	0	(31)	0
Recoveries	0	0	0	0
Balance end of period	160	393	160	393
Commercial \| Commercial and Industrial
Activity in allowance for loan losses
Balance, beginning of period	7,362	4,996	6,190	5,369
Provision for loan losses	29	267	1,265	(150)
Charge-offs	(195)	(14)	(712)	(60)
Recoveries	288	10	741	100
Balance end of period	7,484	5,259	7,484	5,259
Commercial \| Municipal
Activity in allowance for loan losses
Balance, beginning of period	427	164	320	157
Provision for loan losses	(42)	(3)	65	4
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance end of period	385	161	385	161
Consumer
Activity in allowance for loan losses
Balance, beginning of period	7,809	3,404	5,917	2,625
Provision for loan losses	408	(111)	2,472	695
Charge-offs	(192)	(115)	(468)	(168)
Recoveries	96	36	200	62
Balance end of period	8,121	3,214	8,121	3,214
Consumer \| Residential Mortgage
Activity in allowance for loan losses
Balance, beginning of period	7,312	3,193	5,240	2,424
Provision for loan losses	223	(126)	2,221	637
Charge-offs	0	(50)	0	(50)
Recoveries	68	6	142	12
Balance end of period	7,603	3,023	7,603	3,023
Consumer \| Installment and Other
Activity in allowance for loan losses
Balance, beginning of period	497	211	677	201
Provision for loan losses	185	15	251	58
Charge-offs	(192)	(65)	(468)	(118)
Recoveries	28	30	58	50
Balance end of period	$ 518	$ 191	$ 518	$ 191

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
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_FinancingReceivablePortfolioSegmentAxis=orrf_InstallmentandOtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: