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DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Deposits [Abstract]
Brokered money market deposits	$ 45.1	$ 8.1
Brokered time deposits	$ 50.6	$ 0.0

X

- Definition

Deposits, Brokered Money Market Deposits

+ References

No definition available.

+ Details

Name:	orrf_DepositsBrokeredMoneyMarketDeposits
Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Time Deposit Brokered

+ References

No definition available.

+ Details

Name:	orrf_TimeDepositBrokered
Namespace Prefix:	orrf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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